The ultimate guide to hiring a web developer in 2021
If you want to stay competitive in 2021, you need a high quality website. Learn how to hire the best possible web developer for your business fast.
JSON stands for JavaScript Object Notation and it is a data-interchange format that is used for storing and exchanging information. It is more lightweight than the traditional XML format and is even used to send data across the internet from a web server. JSON developers are experts in understanding the syntax of this technology, but also in designing and coding up solutions for a wide range of problems for clients. JSON developers have an essential role in developing a variety of applications such as databases, websites and server-side applications.
Here's some projects that our expert JSON Developers made real:
Overall, hiring a skilled JSON developer can enable businesses to harness the power of a wide range of web solutions — from report automation scripts, eCommerce shopping rules to flight search result interfaces — that be customised for any application or platform. With the help of Freelancer Platform, clients can find experienced and reliable professionals that have collaborated with businesses globally. With access to experts in the field, businesses can rest assured that their projects are being handled by specialized professionals that are well versed with this technology. We invite you to post your project on Freelancer Platform so you can find the most suitable professional for your needs.
Od 134,174 ocen, stranke ocenjujejo JSON Developers 4.9 od 5 zvezdic.JSON stands for JavaScript Object Notation and it is a data-interchange format that is used for storing and exchanging information. It is more lightweight than the traditional XML format and is even used to send data across the internet from a web server. JSON developers are experts in understanding the syntax of this technology, but also in designing and coding up solutions for a wide range of problems for clients. JSON developers have an essential role in developing a variety of applications such as databases, websites and server-side applications.
Here's some projects that our expert JSON Developers made real:
Overall, hiring a skilled JSON developer can enable businesses to harness the power of a wide range of web solutions — from report automation scripts, eCommerce shopping rules to flight search result interfaces — that be customised for any application or platform. With the help of Freelancer Platform, clients can find experienced and reliable professionals that have collaborated with businesses globally. With access to experts in the field, businesses can rest assured that their projects are being handled by specialized professionals that are well versed with this technology. We invite you to post your project on Freelancer Platform so you can find the most suitable professional for your needs.
Od 134,174 ocen, stranke ocenjujejo JSON Developers 4.9 od 5 zvezdic.I'm looking for an experienced full stack developer to join our team building a multi-platform, large-scale, multi-layer, Platform leveraging REST APIs, JSON data exchange, and RBAC/Token-based User access to a backend content and process management system (CPMS). Ideal skills and experience: - Strong experience with REST APIs - Proficiency in backend technologies (Swift) - Knowledge in database management (PostgreSQL) - Experience in secure user authentication RBAC systems - Familiarity with mobile app development and integration - OOP: Swift, SwiftUI, and Embedded Swift - U.S. Citizenship & Residency (required) Please provide examples of similar projects you’ve completed. - Github - Resume
Τίτλος Έργου Δημιουργία Android App για Online Ραδιόφωνο (AzuraCast) Περιγραφή Έργου Ζητώ έμπειρο προγραμματιστή για τη δημιουργία μιας εφαρμογής Android για τον ραδιοφωνικό μου σταθμό "...
我正在寻找熟练运用 Python 的开发者,帮助我完成一套以「爬虫」为核心的数据采集与自动化解决方案,并在此基础上逐步扩展到数据清洗、分析、网站接口对接及办公、电商流程自动化。项目已规划为长期合作,但本阶段只需先交付一份功能完备、结构清晰的爬虫原型,后续模块将按需继续追加。 主要目标 • 搭建一支可复用的 Python 爬虫脚本(requests、aiohttp 或 Selenium/Playwright 任选其一,重视稳定与反屏蔽能力) • 输出结构化数据(CSV/JSON/MySQL 等均可),并附带基本的数据清洗流程(pandas 或自写逻辑) • 提供简单的运行配置文件与 README,使脚本可在 Windows/Linux 服务器一键部署 可选后续方向(非本阶段硬性要求) • 将爬取与清洗结果对接到现有网站后端或可视化仪表盘 • 办公自动化脚本(Excel 批处理、邮件群发等) • 电商平台自动化(下单、价格监控、库存同步等) 交付验收 1. 完整的源代码与依赖说明(Python 3.8+) 2. 演示数据一份,用以验证抓取与清洗效果 3. 简洁文档:运行步骤、参数说明、常见异常排查 申请须知 • 请在投标中重点介绍与 Python 爬虫相关的项目经验;若曾处理反爬、数据清洗或自动化任务,请具体说明成效与难点解决方案。 • 如能展示类似代码片段、GitHub 链接或线上案例,将优先考虑。 我首要需求明确:开发语言必须是 Python,主要场景聚焦在爬虫。如你具备相应经验并乐于长期协作,期待与你聊聊下一步细节。
I need a single-page form built in React.js that allows our manufacturing team to log product specifications and inspection results so we can generate accurate compliance reports for every production run. The form should feel lightweight for operators yet rigorous enough for auditors. Core requirements • Capture fields for both product specification details (tolerances, batch numbers, materials, etc.) and step-by-step inspection results. • Instant client-side validation so incorrect or incomplete entries are flagged before submission. • Clean JSON output that can be handed straight to our existing reporting script; if you prefer using a state manager such as Redux or Context, that’s fine as long as the final data structure is clear. • A concise dashboard ...
I need a small Python utility that can visit a couple of CAD-focused websites and pull down detailed product information in a single pass. The job is one-time, so I’m not looking for scheduling or cron integration—just a clean script I can rerun locally whenever I want. Key details I have to capture per product include the title, part number, main specs, and any listed price or download link. Most pages are straightforward HTML, but a few rely on lazy-loaded sections, so the solution may call for Requests + BeautifulSoup in the simple cases and Selenium or Playwright where JavaScript gets in the way. I’ll provide the shortlist of URLs once we start. Please write clear, well-commented code, keep third-party dependencies to a minimum, and organise output in both CSV and J...
Title: Manual QA Tester for Voice-AI SaaS Portal (Ongoing, ~10–15 hrs/week) Project: We're building a multi-tenant operator console for a voice-AI agency platform (think: dashboard where small businesses get an AI receptionist that answers their phone, books appointments, and answers questions from a knowledge base). New features ship weekly via AI-assisted development. We need a careful, detail-oriented QA tester to validate every release before it touches real customers. ...
I’m running a project on Hostinger’s Horizon platform and every API call is currently failing with a “data retrieval error.” The issue isn’t limited to a single route—every endpoint I test returns the same response. All requests are authenticated with an API key, so it’s not OAuth or a basic-auth problem. Here’s what I need: • Diagnose why the Horizon API refuses to return data when an API-key header is supplied. • Implement and test a clean fix—whether that’s correcting headers, adjusting CORS, rewriting routes, or updating server-side settings—until each endpoint delivers the expected JSON response. • Provide a concise report of the root cause and the steps you took so I can reproduce or roll back if n...
I need an application that reads a multipage PDF, pulls out all the text, and then pours that content into a fresh one-page PDF that follows a custom layout I already designed. The flow is simple: open PDF → extract every text element in reading order → map each string to its assigned field or zone in my supplied template → generate a brand-new single-page PDF ready for distribution. My design file shows exact font sizes, margins, headers, and footers, so the app must respect those specifications pixel-for-pixel. Dynamic text should auto-shrink only when a block overruns its allotted space; everything else should remain fixed. No images or tables need processing—pure text only. I’m open to your preferred stack (Python with PyPDF2/PDFPlumber, Java with PDFBox, o...
I need a compact micro-service written in Go that reaches out to our external hotel-inventory supplier, pulls down hotel name and location data, current room availability, and live pricing, then surfaces that information through a clean set of REST endpoints. Core behaviour • Fetch and refresh data from the supplier API on a configurable schedule, respecting their rate limits. • Expose a /search endpoint that lets callers filter results by city, hotel name, and amenities (all three must work in any combination). • Return concise JSON with the matching hotels, available rooms, and prices, ready for direct use by our front-end team. • Handle errors, time-outs, and partial failures gracefully so the API never blocks a request thread. Implementation notes Please...
我需要一种可靠的方法来捕获不列颠哥伦比亚省彩票公司的实时基诺中奖号码,并通过一个干净、有记录的API将它们推送给我。历史档案、奖品明细或其他游戏,如BC/49、Daily Grand或Lotto Max,现在并不重要;唯一的重点是现场基诺抽奖。服务必须:•频繁地投票或流式传输官方来源,以便在发布后一分钟内获得每个新抽奖。• 曝光HTTPS JSON端点返回抽奖编号、中奖二十个数字、奖金编号(如果有的话)、抽奖时间和捕获时间戳。•包括简洁的设置说明,这样我就可以自己部署或托管它(Docker映像或直截了当的脚本都可以)。•记录失败并自动重试,这样就不会错过抽奖。•附带一个简短的README,显示示例请求和响应。如果您已经有了抓取或整合省级彩票饲料的经验,请告诉我;否则,请概述您将采取的方法以及您喜欢的工具或库。我将通过能够击中终点并实时检索至少三次连续的现场抽奖来判断完成情况。 The lottery data of this official website is relatively slow, slower than the data of the lottery store. What I want is as fast as the data of the lottery store.
The Mission At Job Hunting U, we don't just build software, we build futures. We are a high-end career coaching platform that empowers professionals to bypass recruiters and connect directly with decision-makers to land life-changing roles. Because our clients are in high-pressure career transitions, our AI-driven outreach and OpenClaw systems must be 100% reliable. You are the expert who ensures our specialized OpenClaw systems never blink, even when facing the most complex scenarios. The Professional Mindset: We are looking for a Master Problem Solver, not a ticket-taker. The Architect’s Eye: You don't just fix a bug, you analyze the system to ensure it never happens again. Ownership Mentality: You take pride in "OpenClaw" being your domain. When a "tricky...
I want an Excel workbook that connects to the (public access) and continuously pulls the Nifty 50 option-chain data I specify: the at-the-money strike, plus five strikes out-of-the-money and five strikes in-the-money. For each of those eleven strikes the sheet must capture three fields—Open Interest, Change in Open Interest, and Volume Strike Price—and refresh them automatically every three minutes. Inside the file I need a time-stamped line graph that updates in real time, plotting the same three metrics so I can watch how they evolve through the session without touching the sheet. A single click to start or stop the refresh loop is fine; otherwise the process should run silently in the background. Please build with whichever approach inside Excel you prefer—VBA, Powe...
Je développe actuellement une caméra de vidéo-surveillance sur batterie basée sur le module Lilygo T-Camera S3 (ESP32-S3). Le boîtier est terminé ; il me reste à créer le micrologiciel qui fera le lien entre le matériel et la future application mobile. Objectifs principaux • Activer la détection de mouvement embarquée. • Enregistrer automatiquement une courte séquence vidéo sur détection + envoi cloud si le client a souscrit à cette offre • Diffuser un flux temps réel (RTSP ou autre protocole léger) accessible via Wi-Fi. • Envoyer des push notifications via Wi-Fi à l’application mobile (l’app n’est pas encore dévelo...
I urgently need Java development support to convert a manual office process into a lightweight web application. The work is strictly Java-based and must run as a web application; you are free to choose the stack—Spring Boot, Jakarta EE, or even plain servlets—as long as it can be deployed on a standard Linux server with Tomcat (or similar). I’d like to collaborate immediately, outline the workflow together, and move straight into coding, testing, and deployment. A functional first cut is needed within days, with final polish delivered as soon as possible. Deliverables • Complete Java source code • Deployable WAR/JAR file • README covering build and deployment steps • Short user guide for my team Please share relevant Java web examples an...
I have a single-page HTML file produced by Claude.ai. It contains only standard text, headings, and several images—no forms, sliders, or other interactive pieces. I want the entire layout rebuilt inside Elementor and delivered as an import-ready .json template. Please keep everything on default Elementor styling; no extra CSS should be embedded. Basic widgets such as Text Editor and Image are sufficient to recreate the content and structure exactly as it appears in the original HTML. Deliverable: one clean, error-free Elementor .json file that I can import directly into my site and see the same layout and media displaying correctly.
I am ready to publish a new integration on the OrbisAPI marketplace and need a production-ready RESTful API built from scratch. The service will act as a bridge between OrbisAPI and a small set of third-party APIs that I will specify once the project starts. No local database or file system storage is required—every request will simply fetch, transform, and return data coming from those external providers. Core scope • Design clean, versioned REST endpoints that follow standard HTTP semantics (GET, POST, PUT/PATCH, DELETE). • Handle authentication to the external providers using their preferred schemes (mostly Bearer tokens and OAuth2). • Normalise the responses so OrbisAPI users receive a consistent JSON structure regardless of which upstream service is queried...
I need a small, reliable script that signs in with my Telegram API credentials and exports a clean list of every username present in a specific group I’ll provide. The job is focused only on user-profile data, and within that, only the “@username” handle—no messages, photos, or bios. I’ll be using the resulting list for marketing outreach, so accuracy and deduplication matter. A simple CSV or JSON file is perfect for the final output. Python with Telethon or Pyrogram is ideal, yet if you have a faster or more robust approach I’m open to it as long as it respects Telegram’s rate limits and my account’s safety. Deliverable: • A working script or small app that logs in via api_id / api_hash, accepts a group ID or invite link, and saves al...
**Project Title:** High-Speed Appointment Monitoring & Automation Assistant **Project Description:** I am looking for a lightweight software assistant that can monitor dynamic booking websites and react quickly when appointment slots become available. The goal is to reduce manual effort and improve reaction time in a time-sensitive environment where availability changes rapidly. The system should: • Monitor availability in near real-time (without heavy page refresh) • React quickly when a slot appears • Assist in completing the booking flow using pre-configured user data • Handle session persistence efficiently • Support proxy usage for stable parallel sessions • Provide instant notifications when availability is detected --- **Technical Expectation...
I need a meticulous hand that revolves around three pillars: crafting well-structured JSON payload files, writing Draft-07 JSON Schemas to validate them, and assembling fully featured Web of Things Thing Descriptions. Here is what I must hand in: • A collection of JSON payloads that exercise the full range of data types—strings, numbers, arrays, objects, nested structures—each following a precise filename pattern I will share once we start. • One Draft-07 JSON Schema for every payload, with definitions, references, and clear validation messages so they can slot straight into automated tests. • Two complete WoT TDs: one for a robot system, the other for its controller. Each TD has to expose Properties, Actions, and Events, carry multilingual titles/descripti...
I’m ready to turn Kelebeuzs into a polished, revenue-driving shopping experience on iPhone and iPad only. The core idea is an intuitive e-commerce journey—browse, add to cart, pay, and track orders—built natively in Swift or SwiftUI so we can tap into Apple Pay, push notifications, and App Store performance standards. You will help me move from concept to a TestFlight-ready build and, ultimately, App Store submission. I have the product catalog and brand assets prepared; what I need is the complete iOS application layer: • Modern UI compliant with Apple’s Human Interface Guidelines • Product listing and detail views pulling data from a JSON/REST endpoint (I can supply or we can build together) • Secure user accounts, wishlist, and order history ...
If you want to stay competitive in 2021, you need a high quality website. Learn how to hire the best possible web developer for your business fast.
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