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⚡ Real code, real deadlines, no empty promises. I'm here for your React and React Native projects, whether you're starting fresh or fixing what's broken. I'm Halyna from Koitechs. We fix that: 90+ companies found their React Developer or React Native Developer here - vetted, in-house, matched in 48 hours. 🏆 Why clients work with us ✅ 7+ years of commercial software development experience ✅ 50+ web and mobile projects delivered ✅ 75% repeat clients ✅ 98% client satisfaction rate ✅ 40+ in-house engineers across React, React Native, Node.js, and TypeScript ✅ 48-hour developer matching ✅ 2-week trial period ✅ In-house React Developer s / React Native Developer s only - no freelancers ✅ QA, PM, code review, and CTO oversight available Most companies come to us after missed deadlines, unstable products, or hiring a React Developer or React Native Developer who couldn't deliver in practice. If you're looking for a React Developer, React Native Developer, Frontend Developer, Mobile Developer, Full Stack Developer, or a React / React Native Development team that can contribute from day one, that's exactly where we help. We work with companies that need: • a React Developer for web app development - 30+ web apps shipped • a React Native Developer for MVP development - 70+ MVPs launched • a Full Stack Developer for scaling existing products • a React Native Developer experienced with GPS, payments, chat, and real-time functionality • a Mobile Developer for iOS and Android applications - 500K+ downloads • a Frontend Developer for startup and SaaS products • a Node.js Developer for backend and API development - 1M+ API requests/month • a Full Stack Developer who can join an existing team quickly 💻 React & React Native Development Our React Developer s and React Native Developer s have experience building: • 15+ healthcare and logistics platforms with React and Node.js • 25+ fitness and SaaS products with React Native • 20+ marketplaces and e-commerce apps with React • apps with GPS, chat, and video functionality • $5M+ processed - React and React Native apps with payment integrations • apps with push notifications and real-time features • React and React Native apps connected to complex backend systems built with Node.js Our React Developer s and React Native Developer s help clients launch new web and mobile products, improve existing React applications, scale React Native platforms, and modernise legacy codebases. 🚀 Services • React Web App Development • React Native Mobile App Development • Full Stack JavaScript Development • Node.js Backend Development • MVP Development (Web & Mobile) • Product Scaling • Frontend Development • Application Maintenance & Modernisation • React / React Native Consulting • Team Extension • Performance Optimisation • Feature Development • Application Support 🛠 Tech Stack React, React.js, React Native, Next.js, Node.js, Frontend Development, Full Stack Development, Expo, Mobile App Development, iOS Development, Android Development, TypeScript, JavaScript, Redux Toolkit, React Query, Firebase, Supabase, PostgreSQL, MongoDB, GraphQL, REST API, OAuth, Stripe, AWS, Docker, Vercel, Prisma, Drizzle, Git, Agile, WebSockets, Storybook, Jest, Detox, Push Notifications, App Store, Google Play, SaaS Development, Flutter. Beyond React and React Native Development, our developers also support backend architecture with Node.js, API Integration, payment systems, Next.js applications, OpenAI and Claude API integrations, AI Agent Development, Generative AI, Python, Data Analysis, and product modernisation projects. 🤝 What makes us different ✔ In-house React Developer s / React Native Developer s only ✔ Full Stack Developer s matched to your product needs ✔ Clear communication, weekly reports and demos ✔ 75%+ clients stay with us 6+ months We don't just send CVs. We connect companies with React Developer s and React Native Developer s who have already built similar web and mobile products and can start contributing quickly. Whether you need a React Developer for a new web application, a React Native Developer for ongoing mobile development, a Node.js Developer for backend systems, a Frontend Developer for a growing startup, a Full Stack Developer for end-to-end product work, or a dedicated React / React Native Development team, we can help. React Developer • React Native Developer • Full Stack Developer • Frontend Developer • Node.js Developer • Mobile Developer • React Native Development • React Web Development • Mobile App Development • iOS Development • Android Development • Web Developer • MERN Developer • Scala Developer • WordPress • Laravel • Vue • Angular Let's talk 🤝

I'm a Senior 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 with 5+ years building production SaaS platforms and scalable web applications for startups and growth-stage companies. Most clients don't need two engineers - they need one who thinks about the whole system. 𝗛𝗼𝘄 𝗜 𝗴𝗼𝘁 𝗵𝗲𝗿𝗲 My start was unconventional: a $40 UI/UX gig on Fiverr in 2019 turned into a $300 follow-up, and when I mentioned I also built in React, I was handed a frontend project on the spot. That relationship grew into 4 years of full-time remote work in an agile team - shipping mobile apps, video conferencing tools, payment systems, telecom platforms, and admin dashboards. I grew from designer to full-stack engineer under the mentorship of the company's CTO, which is where I learned what it actually means to build software under real deadlines with real consequences. 𝗥𝗲𝗰𝗲𝗻𝘁 𝘄𝗼𝗿𝗸 Most recently, I sole-engineered a production sports betting platform serving: • 25,000+ users, 15,000+ daily actives • 30,000+ transactions processed daily • 1,500+ bet settlements daily 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 & 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲 • Transaction-safe wallet engine with PostgreSQL & Redis - race-condition proof, optimized for low-latency, high-throughput systems • RESTful API & GraphQL (Apollo) services via Node.js, NestJS & ExpressJS • Real-time WebSocket broadcasting, live data ingestion, and API/AI API integration • Authentication & authorization (JWT, OAuth, session management) • Dockerized, deployed on AWS (Lambda, S3, RDS), CI/CD with zero downtime 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 & 𝗠𝗼𝗯𝗶𝗹𝗲 • Next.js, React, TypeScript, Tailwind CSS, Material UI - responsive and performant • Component architecture with Redux, Zustand, HTML5, CSS3 & Sass • Cross-platform mobile development with React Native (iOS & Android) 𝗖𝗼𝗿𝗲 𝗦𝘁𝗮𝗰𝗸 Node.js · NestJS · TypeScript · PostgreSQL · MongoDB · Redis · Next.js · React · React Native · GraphQL · AWS · Docker · Tailwind CSS · Redux 𝗪𝗵𝗮𝘁 𝗜 𝗱𝗲𝗹𝗶𝘃𝗲𝗿 • End-to-end frontend and backend development for web & mobile • Full-stack SaaS & web application development • API development & third-party integration (OpenAI API, payment gateways) • Authentication & authorization systems • Database architecture (PostgreSQL, MongoDB, Redis) • Performance optimization for high-traffic systems • Microservice & application architecture design • AI app development & model integration • CMS development (Payload, headless) • Code review, refactoring & sprint collaboration I work best on systems where a bug costs real money - real-time platforms, and products that need to scale fast. I'm direct, I document my decisions, and I flag problems before they become yours. 📩 Tell me what you're building - I'll tell you honestly if I'm the right fit. 𝗜𝗻𝘃𝗶𝘁𝗲 𝗺𝗲 𝘁𝗼 𝘆𝗼𝘂𝗿 𝗷𝗼𝗯 𝗮𝗻𝗱 𝗹𝗲𝘁'𝘀 𝘁𝗮𝗹𝗸 𝘁𝗵𝗿𝗼𝘂𝗴𝗵 𝘆𝗼𝘂𝗿 𝗿𝗼𝗮𝗱𝗺𝗮𝗽.

I build Python systems that take repetitive work off a business: scraping and processing data at scale, connecting platforms through APIs, adding AI where it actually saves time, and deploying everything to production so it keeps running without supervision. I have been freelancing full time since 2021 and I am Top Rated on Upwork. Most of my projects start with a business problem rather than a technical specification. I look at the process first, find where hours are being lost, then build the smallest reliable system that removes that bottleneck and keeps working after handover. WHAT I BUILD - Web scraping and browser automation: Selenium, SeleniumBase, BeautifulSoup, Requests, proxy rotation, anti-bot handling, scheduled crawlers - Backend development: Django, Flask, FastAPI, PostgreSQL, MySQL, clean database design and documented REST APIs - API development and third party integrations across CRMs, SaaS platforms and internal systems - AI and LLM integration: OpenAI API, Claude API, RAG systems on your own data, AI chatbots, MCP servers that connect AI tools to real business logic - Workflow automation: Celery, Redis, RabbitMQ, cron and queue based pipelines that run unattended - Data extraction, cleaning, enrichment, validation and reporting with Pandas - SaaS products and internal business tools, including Stripe billing and Twilio messaging - CRM and marketing automation: GoHighLevel, Smartlead, Airtable, Slack, Zapier, Make, n8n - Deployment and DevOps: AWS EC2, Linux, Nginx, Gunicorn, Docker, Git and GitHub HOW I WORK 1. Discovery: I map the current process, the data sources and the real constraints before writing code. 2. Scope: you get a clear plan with milestones, timelines and what is in and out of scope. 3. Build: modular, readable code with logging, error handling and retries, because automation only helps if it survives bad data and broken pages. 4. Deploy: set up on your server or mine, with monitoring, scheduling and documentation. 5. Support: I stay available for changes, scaling and maintenance once the system is live. INDUSTRIES I HAVE DELIVERED IN SaaS and software products, digital marketing and lead generation, sales and CRM automation, SEO and website analytics, IT services and cybersecurity, solar energy and commercial property data, construction and internal operations, recruitment and job data automation, e-commerce, professional services, and data collection, enrichment and validation. WHY CLIENTS KEEP ME LONG TERM - End to end ownership from planning through development, deployment and improvement - I understand business workflows, not just the code in front of me - Experience with complex, high volume automation that runs daily without babysitting - Comfortable taking over, fixing or refactoring existing codebases - Clear and responsive communication, no silent weeks - Focus on reliability, maintainability and measurable outcomes such as hours saved and errors removed - You own everything: source code, credentials, servers and documentation, with no lock in to me I also work with overlapping US and EU hours, so blockers get answered the same working day rather than a day later. If you need a process automated, data collected at scale, an API integration built, a legacy script rescued or an AI workflow added to your operations, send me a message with what you are trying to achieve. I will tell you honestly whether it is worth building, how I would approach it, and what it will take. KEYWORDS TO CONNECT WITH ME: Python Developer, Python Automation, Web Scraping, Selenium Developer, BeautifulSoup, Data Scraping, Data Extraction, API Integration, Flask Developer, Django Developer, FastAPI, Backend Developer, AI Automation, OpenAI API, Claude API, LLM Integration, RAG Chatbot, MCP Server Development, SaaS Development, Workflow Automation, CRM Integration, GoHighLevel, Smartlead, Airtable Automation, n8n Automation, Zapier, Make, Celery, Redis, PostgreSQL, AWS Deployment, Linux, Docker, Internal Business Tools

✅ Meta App Approvals — Guaranteed. Or You Don't Pay. While others guess their way through Meta's review process, I've spent 10+ years engineering the systems behind it. I don't just get approvals. I build the products that need them. 📊 The Numbers: 🏆 270+ Projects Completed 💰 $200K+ Earned on Upwork ⭐ Top Rated Plus | Top 3% Globally | 5-Star Rated 🚀 60+ Apps Approved in the last 6 Months 🔐 400+ Permissions Secured 🛠️ 30+ SaaS Products Built from scratch on Meta APIs Most freelancers submit your app with hope but I know exactly what Meta's reviewers want because I've been in this ecosystem since before most developers knew the API existed. 🎯 You bring the vision. I'll bring the build and the badge. 🚫 Rejected by Meta? I fix that fast. If you're hitting the "Invalid Screencast" wall or stuck in an endless rejection loop, you're not alone and you're in the right place. I've rescued hundreds of clients from exactly this situation. I handle everything, I record the screencast myself, prepare the full submission, and manage direct communication with Meta's review team until you're approved. Most clients get the green light in 1–10 business days. Meta & Social Platform Approvals: ✅ Meta App Reviews or API Permission Approvals Expert ✅ Facebook App Review Expert ( Facebook Pages & Instagram & Ads & Threads) API Permissions Approval for Advanced Access ✅ Facebook API permissions Approval Expert ✅ Instagram API Permissions Approval Expert ✅ Meta Marketing / Ads API Permissions Approval Expert ✅ Threads API Permissions Approval Expert ✅ Expert Facebook/Instagram/Telegram/WhatsApp Chatbot Developer ✅ Expert in API integration ✅ Expert Facebook API Developer ✅ Expert Instagram API Developer ✅ Facebook Tech Provider/ Access Verification Expert ✅ Facebook Business Account Verification Consultant ✅ Meta App Data Deletion Request Callback Implementation ✅ TikTok Marketing Developer App Approval Expert ✅ TikTok Developer API App Approval Expert ✅ Expert in Marketing Automation Software ✅ Expert in WordPress Plugin Development ✅ Worked with PHP Script and SaaS selling company Codecanyon, Jvzoo, Warrior+Plus. ⭐ Why clients come back: I don't hand you a checklist and disappear. I'm in the trenches with you — writing, recording, submitting, and negotiating — until Meta says yes. 𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 𝗔𝗣𝗜 (𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗟𝗼𝗴𝗶𝗻) instagram_business_basic, instagram_business_manage_comments, instagram_business_manage_messages, instagram_business_manage_insights 𝗙𝗮𝗰𝗲𝗯𝗼𝗼𝗸 𝗔𝗣𝗜 𝗣𝗲𝗿𝗺𝗶𝘀𝘀𝗶𝗼𝗻𝘀 pages_read_user_content, pages_manage_posts, pages_show_list, pages_manage_metadata, pages_user_locale, pages_user_gender, pages_manage_engagement, pages_messaging, read_insights, pages_read_engagement, pages_user_timezone, Business Asset User Profile Access 𝗜𝗻𝘀𝘁𝗮𝗴𝗿𝗮𝗺 𝗚𝗿𝗮𝗽𝗵 𝗔𝗣𝗜 (𝗙𝗮𝗰𝗲𝗯𝗼𝗼𝗸 𝗟𝗼𝗴𝗶𝗻) instagram_basic, instagram_content_publish, instagram_manage_comments, instagram_manage_messages, instagram_manage_insights, Instagram Public Content Access, Human Agent, instagram_branded_content_ads_brand, instagram_branded_content_brand 𝗠𝗲𝘁𝗮 𝗠𝗮𝗿𝗸𝗲𝘁𝗶𝗻𝗴 / 𝗔𝗱𝘀 𝗔𝗣𝗜 business_management, ads_read, ads_management, pages_manage_ads, leads_retrieval, catalog_management 𝗧𝗵𝗿𝗲𝗮𝗱𝘀 𝗔𝗣𝗜 threads_basic, threads_content_publish, threads_keyword_search, threads_manage_insights, threads_manage_mentions, threads_manage_replies, threads_read_replies 𝗪𝗵𝗮𝘁𝘀𝗔𝗽𝗽 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗔𝗣𝗜 whatsapp_business_messaging, whatsapp_business_management 🛠️ What I Do: I specialized in Meta API development and social media SaaS products — from Facebook Graph, Marketing, and Messenger APIs to Instagram (Graph, Business), WhatsApp Business & Cloud API, Threads, Twitter/X v2, Pinterest, Reddit, Shopify, integrations. I also handle Webhook, IPN, and Cron Job setups end to end. SaaS Products I've Built: Instagram Comment & DM Automation, Facebook Ads Creation Portals, Social Media Posting Platforms, AI Chatbots powered by OpenAI & ChatGPT for Messenger and Instagram, CRM Dashboards, and Marketing Automation Software. I've worked with ChatPion, Stackposts, and ChatWoot. Any white-label social media tool — I've seen it and can get it approved. ⚙️ Tech Stack: JavaScript (TypeScript,React,Next.js,Node.js, Express, Vue), Python, PHP (Laravel, CodeIgniter), MySQL, PostgreSQL,MongoDB,Redis,AWS,Git 💬 What Clients Say: ⭐ "Mir was an absolute game-changer. Deep understanding of Meta's API ecosystem — permissions, configurations, best practices. If you need a Meta API expert who is highly skilled and a pleasure to work with, Mir is the person to hire." — Sheila, USA ⭐ "Best guy on Upwork for API development. We already hired him on another project." — Marius, Romania ⭐ "His knowledge of FB and API integration is really deep and comprehensive. Very happy." — Fabrizio, Italy ⭐ "Anything Meta app permission related, he'll fix it for you." — Roy, USA

Hi, I’m Sandeep — A full stack software engineer with 5+ years of hands-on experience building modern, fast, and secure web applications using PHP I work like a professional product team: ✔️ I Have pain subscription of cursor ai and know how to use efficiently to create/debug. ✔️ Use GitHub or Bitbucket for clean version control ✔️ Write clean, maintainable, production-ready code ✔️ Integrate APIs with strong client-side validation and error handling ✔️ Deliver complete documentation — from API usage to deployment steps ✔️ Optimize websites for speed, SEO, and responsiveness ✅ What I Can Do for You: Custom Dashboards & Admin Panels Booking Systems, Multi-Page Applications, SaaS Applications, Market Place applications REST API Development SEO Optimization, Lighthouse Improvements Full project setup with codebase + documentation + deployment Lando, Docker 📄 Deliverables I Include: Clean and well-structured source code GitHub or Bitbucket API integration guide or documentation Deployment-ready files and instructions (S3, GCP, Hostinger, VPS, etc.) Optional post-delivery support Clients hire me because I’m fast, reliable, and communicative — and I take full ownership of the project. If you're looking for a developer who will think beyond code and deliver business-ready solutions, let’s connect. Let me know if you want a version customized further for e-commerce, SaaS, or admin dashboards, or a separate bio section for your specialized project catalog.

I help startups, agencies, and businesses build secure, scalable, and high-performance web applications using modern technologies and AI-assisted development workflows. With strong experience in backend engineering, API development, cloud infrastructure, and frontend frameworks, I deliver clean, maintainable solutions that are fast, reliable, and production-ready. What I Can Help You With ✅ Custom Web Application Development ✅ REST API & GraphQL Development ✅ SaaS Platforms & Business Systems ✅ AI-Assisted Development & Automation ✅ Third-Party API Integrations ✅ Performance Optimization & Security Hardening ✅ Legacy System Upgrade & Modernization ✅ Cloud Deployment & DevOps Setup Backend & Web Technologies • Laravel, Django, Spring Boot, Yii2 • Express.js, NestJS • WordPress, Drupal, Magento • PHP, Python, Java, JavaScript, TypeScript • MySQL, PostgreSQL, MongoDB, Redis Frontend Development • React.js, Vue.js • Tailwind CSS, Bootstrap • Alpine.js, Livewire, HTMX Cloud & DevOps • AWS, GCP • Docker, Kubernetes • CI/CD Pipelines • Linux, Nginx, Apache API & Integrations • Stripe, PayPal • Twilio, Firebase • Slack, Zapier, Xero • REST APIs & GraphQL AI Development Workflow I actively use modern AI development tools to improve delivery speed, code quality, debugging, and architecture planning: • Cursor • Claude • ChatGPT • GitHub Copilot Why Clients Work With Me ✔ Clean, maintainable, scalable code ✔ Fast communication & reliable delivery ✔ Strong debugging and problem-solving skills ✔ Production-ready deployment experience ✔ Security-focused development approach ✔ Ability to work independently and take ownership Whether you need a custom platform, backend API, cloud deployment, or ongoing development support, I can help turn your ideas into reliable software solutions. Let’s build something great together.