Ios application android applicationdela

I am in need of an experienced android app developer proficient in Flutter. Key responsibilities will include: - Implementing the design I have prepared for my app, all while maintaining its aesthetic appeal - Developing and integrating a User Authentication feature, which will primarily rely on email and password login It would be beneficial if you have significant experience in Flutter and have previously worked with User Authentication. An eye for detail and appreciation for clean, user-friendly design is critical. I am excited to see your bids and start this project with you!

...help me with my existing web application. Specific Responsibilities: - Design and implement a user registration and login system - Add payment integration capabilities - Introduce effective database management solutions The purpose of this project is to improve a current application with the following: - Develop new features - Execute UI/UX enhancements Ideal candidates for this project should have: - Comprehensive experience in PHP, specifically Codeigniter framework - Knowledge in designing and implementing user registration and login system - Proficiency in payment gateway integration - Significant experience in database management - A keen eye for UI/UX design - Experience in new feature development Your main goal will be to add value to the application by...

We are actually building an Angular App (we also have flutter option) we need to get navigation step by step with voice guidance for delivery drivers. We decided to use the Mapquest SDK. I am looking for a resource that has already implementing the MAPQUEST SDK over ANGULAR (or flutter) to help our two developpers to accelerate the process of implementing the navigation. The SDK is already connected and we already have the map on front-end.

I'm seeking a highly skilled Flutter developer to create a unique app for per...traditional todo list app, but also allow the addition of photos to each item. The photo addition is a key feature and should be user-friendly and quick to use. Key Features: - User registration and login - Todo list creation with photo addition per item - Compatible with both Android and iOS Ideal Experience/Skills: - Experience in Flutter App Development - Strong understanding of user registration and login mechanisms - Prior experience with photo-based apps - Proficiency in multi-platform app development (Android and iOS) Since the app is intended for personal use, I emphasize user-friendly design and easiness in navigating. I look forward to seeing your bids and your por...

For this project, I require an experienced Android developer with a firm understanding of Firebase to implement system-event triggered push notifications. Key Responsibilities: - Integration of Firebase into the existing Android platform - Configuration of push notifications that respond to specific system events The ideal candidate should have: - Proven experience in Android Development - Proficiency in Firebase integration and usage - Understanding of system-event driven push notifications - Attention to detail ensuring seamless operation. With this project, my aim is to enhance user engagement by leveraging impactful, timely push notifications tied to significant system events.

It is necessary finish a project managemet application made in laravel. The change are: - make some change regard the flow, the links, the design, the ecommerce and report; - It is necessary experience in query, report charts, pivot builder and Business intelligence to change the reports that must have good design, many filter and cross. the charts must have drill down. Please answer only if have experiences in project management software and pivot-query-busienss intellegence. And show my the url of similar job made.

I'm looking for a skilled app developer to create a delivery service application for both iOS and Android platforms. I expect this app to have various essential features such as: - User registration and login functionality: Users should be able to register and login via their email and password. Incorporation of phone number verification for added security is also desired. - Order tracking: This feature will allow users to easily track their orders in real time. - Payment integration: A secure and easy-to-use payment system is crucial to allow users to make transactions smoothly. In addition, it's crucial for the app to show detailed product descriptions for users to make informed choices. The ideal candidate must have experience in developing simila...

We are seeking an experienced app developer to assist us with the deployment of our Android application on the Google Play Store. The app has already been developed and tested, and we are now ready to publish it to the Google Play Store. Responsibilities: Prepare the necessary assets and documentation required for app submission. Ensure that the app meets all Google Play Store requirements and guidelines. Upload the app to the Google Play Console and manage the submission process. Address any issues or feedback from the Google Play Console team during the review process. Provide ongoing support and maintenance for app updates and revisions as needed. Requirements: Proven experience in deploying Android applications on the Google Play Store. Familiarity with the Goog...

I'm seeking a skilled and experienced mobile app developer who is proficient in both iOS and Android platforms. The application is aimed at Russian speakers learning French. At a later stage, it could be developed for other languages. The general idea is as follows: the user subscribes to the application for a certain sum each month. Every day, via a push notification, they receive on their phone a sentence in French with the Russian translation, a recording of the French sentence (to ensure correct pronunciation), a few grammatical indications and colors to clearly identify which French word corresponds to which Russian word. The aim is to enrich vocabulary and grammar. The sentences in French and Russian as well as the recordings would be created by m...

I'm on the search for a highly skilled Flutter developer with a focus on Android development. I have an app source code, you know to reskin it and ready for publishing on the Google Play Store.

I am currently experiencing an application crash issue in a Windows environment. I need a skilled troubleshooter who is experienced in handling software issues, particularly in crashing applications. Key Responsibilities: - Accurately diagnose the root cause of the application crash - Develop and implement a suitable solution to rectify the problem - Test the solution effectively to ensure the application runs smoothly Ideal Skills and Experience: - Proficient in Windows operating systems - Strong ability in diagnosing and resolving software issues - Proven experience in fixing application crash issues.

I'm seeking an expert in AR application development, ideally, with UnrealEngine experience to design a cross-platform application compatible with both iOS and Android devices. The primary purpose of the app is commercial use, incorporating the key features: - Geo-location tracking: The app should accurately track and utilize user's location to provide relevant content and interaction. - Visualize Geo located 3d object in Augmented Reality

In this project, I need a skilled individual to automate testing for my web applications. Your primary focus will be functionality testing. As for the testing framework, I would like the work to be done using Selenium. Here are the specifics of the project: - You'll be performing functionality testing, to make sure everything operates as expected. - The testing framework of choice is Selenium, I expect you to be proficient using it. To complete this project, you'll need an excellent understanding of Selenium and a strong experience in automation testing for web applications. Your expertise in functionality testing will be a major plus. Please provide proven examples of previous work in this area. Your ability to deliver on time and maintain clear communication will be key deter...

I am seeking a talented designer to revamp the UI/UX for my mobile application, targeting both iOS and Android platforms. Your tasks will primarily involve: * Redefining the color scheme * Laying out an intuitive navigation layout * Fine-tuning the typography Ideal skills for this job include: * Proficiency in designing for iOS and Android platforms * An acute understanding of typography, color theory, and navigational layouts * Previous experience in UI/UX design for mobile apps Although a specific style or aesthetic has not been defined, I encourage the use of creative freedom, using current design trends as inspiration. Applicants with a diverse portfolio that demonstrate capability in various styles will be given preference.

I am urgently seeking a proficient and experienced game developer who can assist in identifying and fixing a bug in my game. However, a critical issue arises when the game is accessed and played through Facebook stories using Facebook's native browser on iOS devices. The bug manifests as the browser itself shutting down abruptly when a user swipes from left to right on the screen. This bug significantly detracts from the user experience and disrupts gameplay. you must be an expert in html, js , CSS as these will help you in this task Remember, the vagueness of this request calls for someone who can think on their feet and quickly adapt to whatever challenge this bug may present. Looking forward to your applications!

Currently, I am in need of a competent Android developer to build my MLM app. This app should be designed with a professional and corporate aesthetic and should contain the following features: - User registration and login functionalities - Genealogy tree visualization - Comprehensive transaction history tracking - A system for all types of income generation - A tree showcasing all users - A reward and gift system for active users - Comprehensive modeling of a variety of MLM plans including Binary Plan, Matrix Plan, and Unilevel Plan using various algorithms. Skills and Experience: - Android development - Knowledge of MLM businesses and algorithms - Algorithm development - Adept at corporate design - Experience developing reward systems - Proficiency in developing regi...

I have a website which allows customers to order food online but need to make an app from it for Android Google Play and Apple IOS No time wasters Serious skilled workers only a meeting call will be absolutely essential to go over the details of the job. Note i have multiple apps needing done but all follow the exact same website structure only the name /address and icon will change basic details

I am looking for a skilled iOS developer, proficient in React and Swift, to assist with the development of an interactive product-specific app. Key tasks involved: - Comprehensive app development, with a strong focus on the integration of backend features for seamless navigation and user experience. Required app features and functionalities: - To efficiently display and navigate across multiple product features, this app will need a robust product catalog system. Ideal skills and experience for the job: - Proven experience in developing dynamic iOS applications, with interactive features and backend integrations. - A strong understanding of React and Swift programming. - Previous experience with product catalog systems would be highly favorable. This project is ...

Hello, I am looking for a developer to create an App (Android and IOS) for an green tech project, working title "P". 1. Main Features: - User account - Photo Upload including GPS-tag - Photo comparison (ai-based) - Banking features (buy, sell, trade, exchange). 2. Design and Branding: - Defined by client 3. Schedule: - Project work scheduled 13.-15.05.24. Please apply, referring me to 1 (one) specific reference project. Only non-generic applications considered. Project website will be shared for reference with relevant applicants. Many thanks for your time, Christian

...skilled iOS developer to design and create a platform-based application alongside me in Bangalore, India. Agency or companies do not bid. I’m ready to onboard you immediately with travelling and accommodations reimbursement in advance. This will be a month long project and happy to ₹pay more than a lakh for this period. The app should be universally compatible, intended to function smoothly on both iPhone and iPad devices. Please place your bid having the keywords name of any color. Key Requirements: - Universal iOS app development is required, with capability to run seamlessly on both iPhones and iPads. - Consideration and optimization for compatibility across all iPhone models supported by the latest iOS version is mandatory. Ideal Skills and Exper...

...and versatile application developer for a translation-focused mobile application. The app must support both Android and iOS platforms. Primary Functions: • The main function of the app is language translation - a tool that users can utilize to translate text from English to Arabic and vice versa. Skills and experience required: • Proven experience as an app developer with a portfolio of mobile apps. • Proficient in programming languages for iOS and Android. • Knowledge of cross-platform application development would be a plus. • Familiarity with language learning applications and translation functionalities. • An understanding of Arabic and English to better cater to the app’s translation function. ...

READ FIRST!!! - NDA sign mandatory - The code delivered will be owned by us - You must to verify firstly that the code its possible to be used in a commercial environment - DONT BID an amount for later request x4 when you understand the project - it must to be valid for Android and iOs I am in need of a competent and experienced mobile app developer, specifically one proficient in Flutter, to create a media editor for our app catered towards sharing and editing videos and stories. Our app (core) are designed to function like popular social media platforms like Facebook, Instagram, and TikTok. WE HAVE VIDEO RECORD FUNCTION YET Required Features: - Edit videos and stories (filters) - Video editing capabilities like trimming/cutting, adding text/graphics, and applying fi...

I'm in need of a freelancer with expertise in Android and iOS app development to correct my scripts and facilitate their submission to respective app stores. Specifically, I am looking for the following skills and experience: - Proven track record in web and graphic design - Demonstrated experience in content writing, particularly within the tech industry or for mobile apps - Familiarity with app deployment processes for Google Play and the Apple App Store While the language my code is written in is undisclosed, versatility in handling different programming languages will certainly come in handy for this task. Get in touch if you believe you have the qualifications to carry this project through successfully.

I need an experienced developer who can create a mobile application using Hyperledger Indy, for both Android and iOS platforms. The application should include key aspects of Hyperledger Indy functionality. Key features: - Identity Verification: The apps should have capabilities that function to verify users' identities. - Mobile Wallet Integration: Implement necessary features within the wallet which include Account Creation, Transaction History tracking, and QR Code Scanning for ease of transactions. Ideal skills and experience: - Proficiency in Android and iOS mobile app development - Previous experience with Hyperledger Indy is a must - Experience in implementing identity verification features - Understanding of mobile wallet integration ...

I'm seeking a highly skilled developer to build a cashier system compatible with iOS, Android, and Windows platforms. This challenging project includes important facets such as: - Seamless Menu and Price Editing: The system should allow for easy, direct adjustments to menu items and costs through the interface, minimizing time-consuming updates. - Customizable Reporting: The key reporting feature I'm after involves generating custom sales reports for selected date ranges. This will enable astute business decisions based on solid data. - Versatile Payment Options: The system should facilitate efficient payment processing with simple connections to a range of payment devices enhancing customer experience. - Sales Tracking: Accurate sales tracking reports are a mus...

Nous avons besoin d'un ingénieur iOS freelance pour affiner, peaufiner et construire des composants clés de l'application. Leur expertise en Swift, UIKit et programmation réactive est cruciale pour une intégration UI fluide, une optimisation et la résolution de bugs, en alignement étroit avec les concepteurs de produits.

I'm seeking an individual well-acquainted with setting up both Android and iOS developer accounts. This task needs a seasoned professional who comprehends the application distribution and analytics aspects of these platforms. Key responsibilities would include: - Configuring both Android and iOS developer accounts - Ensuring accounts are ready for app distribution - Configuring the analytics tools within both accounts Though I'm uncertain about my specific target audience for my apps currently, suggestions identifying potential audiences would be appreciated. Ideal candidates must have a solid background with both Android and iOS platform operations. Previous jobs involving setting up developer accounts and app distribution ...

I need a skilled Flutter developer to create a cross-platform application, compatible across iOS and Android. The application will require integration with social media platforms, making it easy for our general users to connect and share content. Ideal Skills: - Strong experience in Flutter development - Previous experience in integrating social media APIs - Familiarity with cross-platform development for iOS and Android Your day-to-day tasks will include: - Developing a user-friendly app using Flutter - Implementing a smooth social media integration feature - Regularly updating and maintaining the app post-launch Please bid with relevant Flutter application samples and your approach towards integrating social media features.

...seeking an expert Appium developer to create an iOS compiler that can work efficiently with Appium native and Flutter. Work to do(I assume it is something like this): 1. setup appium on a mac machine 2. install flutter and swift compilers 3. probably create a docker instance for each compilers from that MAC machine 4. enable so testing can be made after the app has been compiled and results can be stored into logs. The above should be done the same for Android Key Requirements: - Design and develop the iOS compiler. - Integrate the compiler with Appium native and Flutter. - Focus specifically on compiling function within the Flutter app. Ideal Skills: - Expert knowledge of Appium. - Proficient in Flutter. - Excellent iOS development an...

I'm seeking a flexible and experienced Android app developer to create an application whose specifications are not yet defined. Key potential features may include user registration and login, push notifications, and in-app purchases. The main purpose and design are yet to be determined, thus, a resourceful and adaptable approach to development is necessary. This project may be suitable for developers who excel in creating social networking, e-commerce, or educational apps with a diverse range of design styles: minimalist, colorful, clean, and modern. The project specifics will be finalized in collaboration with the successful bidder.

I'm looking for a skilled Android developer who can create a financial management app. This job requires proficiency in the following areas: - Android app development - Finance or accounting knowledge The app should offer features for: - Accounting, including invoicing and financial reports generation - Personal finance management, involving expense tracking and budget tool inclusion Experience in developing similar applications would be beneficial. It's essential to have a good understanding of how financial apps work to ensure seamless integration of these features. Successful completion may lead to future collaborations for app enhancements or related projects.

I need a versatile mobile app developed for both iOS and Android platforms. This app will serve multiple functions within a gym setting: Main Features: - Class Schedule Checking: Users should be able to check for available classes and their timings. - Personal Fitness Tracking: Capability for users to monitor and track their fitness progress. - In-app Booking: Users need to be able to book classes and other gym services through the app. - Payment Processing: The app should support seamless in-app payments for bookings. User Authentication: To ensure secure user access, I require two levels of user authentication: - Basic Login: Traditional email and password-based sign-in. - Biometric Login: To provide an additional layer of security, the app should support fingerprint and ...

I am urgently seeking a proficient and experienced game developer who can assist in identifying and fixing a bug in my game. However, a critical issue arises when the game is accessed and played through Facebook stories using Facebook's native browser on iOS devices. The bug manifests as the browser itself shutting down abruptly when a user swipes from left to right on the screen. This bug significantly detracts from the user experience and disrupts gameplay. you must be an expert in html, js , CSS as these will help you in this task Remember, the vagueness of this request calls for someone who can think on their feet and quickly adapt to whatever challenge this bug may present. Looking forward to your applications!

...individual who has taken the first steps towards digitizing data management, I am seeking a proficient Android developer who can transform my existing Excel-based userforms into an enticing Android application. Specifically, the tasks will involve: Functionalities and Features Development: - While I've nailed down some functionalities, I would appreciate some guidance in further enhancing the app's features. Your ingenious input on potentially beneficial features and functionalities, based off our Excel prototype, would be welcomed. Data Interaction: - The app should be designed for data input tasks solely. Users should find it convenient to input data on the go, directly from their Android devices. External Data Syncing: - A critical feature o...

I'm seeking an experienced team to build a full-service e-commerce web application, coupled with companion mobile applications for both iOS and Android platforms. Key functionalities should include: - An advanced product search and filtering system. - Shopping cart and secure checkout process. - User review and rating functionality. - Separate login sections for vendors and users. - A system that allows vendors to update their product catalog. - Payment gateway integration for streamlined transactions. - An effective order tracking system. - A logistic network monitoring system that ensures efficiency. Given the comprehensive nature of this project, knowledge in e-commerce website and mobile app development would be preferable, with the understanding of payment ...

Looking for a Electron JS developer for a cross platform application that will run on Linux/Mac/Windows platform. Required Experience: 1. Proficient in Electron JS framework 2. Understanding of standard UI/UX practises is a plus. Project Details: 1. Develop application from provided figma designs. 2. Complete wireframes will be provided. (~20 screens) 3. Compatibility across Windows, Mac, Linux operating systems We have a hard deadline of 18th April, 2024.

Hi, I'm in need of a proficient mobile application developer who can realize my vision of creating a groundbreaking AI-powered virtual boyfriend or girlfriend for Android and iOS. Here's what I'm after: * An interactive conversational chatbot with top-notch features including natural language processing, emotion recognition, and contextual understanding. * A facility to personalize the AI's personality is crucial. Users should be able to customize their virtual partner's character traits to their liking. * Engaging virtual date activities should be incorporated to enrich the user experience. Experienced developers with knowledge in Artificial Intelligence, Natural Language Processing, and Mobile Application Development are encouraged ...

I'm looking for a talented developer with expertise in Flutter Mobile App Development. You'll be developing a sleek, modern, and minimalistic taxi booking app similar to Uber or Ola. Key Requirements: - Development for Android, iOS and a functioning website. - Implement GPS Tracking, In-app payment mechanism, and Ride history features. - Use a modern and minimalistic design approach. The ideal freelancer should have: - Strong experience with Flutter cross-platform development. - A proven track record of designing mobile apps with a modern and minimalistic aesthetics. - Familiarity with GPS tracking and payment gateway integration. - Prior experience in developing taxi booking apps will be highly appreciated. Your proposal should include links to previous releva...

I require a skilled app developer to create an informative and user-friendly app for my university. The app needs to cater to students, faculty members, and alumni. Key Features: * Push notifications for key announcements * An organized setup to view class schedules and assignments * Incorporating a detailed campus map The app is to be developed specifically for the Android platform. Freelancers must have experience in developing educational or institutional apps and possess in-depth knowledge about integrating various features into one app. Understanding of push notifications, schedule organization, and map integration is necessary. Also, developers need to estimate the complete amount required to update the app in the app store.

In need of a proficient designer skilled in graphic and UI/UX design to create a sleek, user-friendly app for both iOS and Android platforms. This project requires a React Native developer to build functionalities including user authentication and payment integration and Image manipulation into the app. Your main responsibility will entail transforming my ideas into appealing and intuitive mobile interfaces. Key Skills Needed: - Expertise in React Native - Proficient with UI/UX and graphic design - Experience with user authentication and payment integration mechanisms - Prior experience in full-stack app development will be highly valued. Your designs and code will inspire and influence a seamless user experience. Check the project out!

...quick help with Google AdMob campaign for my Android APP. I only want to show our Ads(banners/text ads), inside other people Android apps or games. (I do NOT want to make revenue inside my app for now). I need to drive traffic and installations of my new app. I have an account linked with Google Ads. Banners for Ads are ready. Your job is: - Create a campaign (with few existing banners, text) and ensure the smooth operation of it - Campaign have to start to show impressions and drive installs of my app - Give me quick explanation how can I easily manage my ads/campaigns by myself in future for my app Ideal candidates for this task will possess demonstrable experience and proficiency in Google AdMob campaigns, specifically on the Android platform. A sharp und...

I need a professional videographer to create a short, 1-2 minutes video showcasing the key features of our budget email-marketing software - BudgetMail. The video should explain features including but not limited to: - E-mail Campaigns with Drag & Drop Email Builder - Marketing Automations - AVG Proof (GDPR compliant) - API + Zapier Integration - Integrated CRM The main objective is to succinctly convey the benefits and functionality of our platform, and encourage viewers to sign up for our free 30-day trial. This project requires expert knowledge of video production, and preferably some familiarity with web apps or e-mail marketing. It would also be advantageous if the freelancer has a background in marketing or advertising, to ensure our unique selling points are truly leverage...

...experienced C++ developer with CMake expertise to compile the MVS-Texturing project for iOS/arm64 and integrate it with SwiftUI in Xcode. Familiarity with iOS development and the ability to solve issues independently are crucial. Responsibilities: Compile MVS-Texturing for iOS/arm64. Integrate compiled code with SwiftUI in Xcode. Requirements: Advanced C++ and CMake skills. Experience with SwiftUI/Xcode for iOS. Knowledge of MVS-Texturing (GitHub: nmoehrle/mvs-texturing). Completion Check: The project is considered complete when: A simple ios swiftui app with button can trigger the MVS-Texturing process. Documentation on integration steps is provided. Apply If: You have solid C++/CMake skills and experience with iOS/SwiftUI projects. Briefly...

I'm seeking experienced eCommerce developers to design and build a comprehensive web application and corresponding iOS/Android apps to sell physical goods. Key functionality requirements are: • User and seller registration/login systems. Users should be able to set up accounts, sign in securely, manage their profiles and buying/selling history. • Sellers requires a system to update their product catalog conveniently. • Robust product search and filter capabilities. A dynamic, intuitive interface will enable users to search for and filter goods quickly and accurately. • Logistics management. User should be able to track their orders by using their order ID. • Seamless shopping cart and checkout processes. Buyers should be able to easily ad...

I've built an iOS app using flutter with functional features like user authentication, push notifications, and in-app purchases. The development work is all tidied up, but I need help getting it listed on the App Store. We have it listed on playstore already. I've got an Apple Developer Account sorted out, and all the metadata and graphics such as screenshots, app icon, and a preview video are ready. Responsibilities: - App listed on iOS - Fix bugs (if any) - Get the QA of the final build from us Must have - Macbook - Prior experience in app listing on Apple App Store - Extensive experience in flutter Skills and Experience: - Proven record in successfully listing apps on the App Store - Understanding of Apple's guidelines and requirements - Expertise...

I'm looking to have an application developed for iOS and Android platforms that mirrors our website with the main purpose being e-commerce. Significant capabilities of this application should include the listing of various products, a user-friendly shopping cart, as well as a comprehensive user review system. Additionally, I would be very interested in the integration of a booking option complementing the overall online shopping experience. A membership system is also deemed necessary, accompanied by a user point system that will potentially contribute to customer loyalty and increased user engagement. Ideal candidates for this project must possess strong skills and experience in iOS and Android app development, e-commerce, and user interface ...

I am looking for a proficient react native developer to turn my design into a fully functional app, compatible with both Android and iOS platforms.

...high-performance cryptocurrency mining application for both Android and iOS that offers real-time mining statistics, a user-friendly interface, and supports multiple mining algorithms. Key Features: - Real-time mining statistics: Allow users to monitor their mining process and revenue growth in real time. - User-friendly interface: Ensure the application interface is clear, intuitive, and straightforward for users to navigate. - Multiple mining algorithms: Incorporate a variety of mining methods to provide flexibility and adaptability for varying user needs. We didn't specify cryptocurrency, leaving you the opportunity to suggest widely-used ones to us. Your input will be appreciated. Ideal Skills: - Strong experience in Flutter Development for both ...

...I need a robust application to track pickups and deliveries. Our customers will need to create lists that can be checked off by employees in real time. Currently, we're using 'Notes', but we're looking for an enhanced solution. Key Features: - Push Notifications: Alert users with real-time updates. - Real Time Updated Listing: Immediate updates on pickup and delivery statuses, providing a clear view of the delivery process. - Potentially User Authentication: Depending on the need, user authentication may be required. - volume tracking for each company. Want to be able to see how many pickups and deliveries are done Platforms: - The app should be developed for iOS, Android and Web. Ideal skills: - Experience in developing logistic apps. - ...

I am seeking a skilled iOS developer to design and create a platform-based application alongside me in Bangalore, India. I’m ready to onboard immediately with travelling and accommodations reimbursement in advance. This will be a month long project and happy to ₹pay more than a lakh for this period. The app should be universally compatible, intended to function smoothly on both iPhone and iPad devices. Key Requirements: - Universal iOS app development is required, with capability to run seamlessly on both iPhones and iPads. - Consideration and optimization for compatibility across all iPhone models supported by the latest iOS version is mandatory. Ideal Skills and Experience: - Proven experience in iOS platform app development and optimization,...