Hire the Best Backend Rest API Freelancers
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Startups and enterprises hire me when they need an AI-powered mobile app or immersive XR simulation built to production standard — not a prototype that falls apart after launch. I've delivered Flutter apps with LLM integration, Unity enterprise simulations, and mobile products currently serving real users across multiple markets. What I build: — AI-powered mobile apps (Flutter + OpenAI / Claude / Gemini) Chat assistants, AI coaching apps, LLM-integrated workflows, real-time AI features inside existing apps — Enterprise XR & Unity simulations Training simulations, serious games, AR/VR prototypes for industrial and medical clients, Photon multiplayer, cross-platform deployment — Flutter apps from MVP to App Store Full-cycle development: architecture, Firebase backend, payment integration, App Store + Play Store submission Why clients work with me: → I've maintained a $10K+ long-term engagement for a single client — I'm not a one-project developer → Production-ready code with clean architecture, not copy-paste tutorials → I flag problems before they become blockers, not after → Fast response, honest timelines, zero scope surprises Tech stack: Flutter · Dart · Unity · C# · Firebase · Node.js · OpenAI API · Claude API · Gemini · REST APIs · Photon · AR Foundation · XR Toolkit · .NET · Angular · React · Figma Flutter developer | Flutter app developer | AI mobile app developer | AI app development | Flutter Firebase | Flutter OpenAI integration | Flutter Claude AI | Flutter Gemini | Unity developer | Unity XR developer | Unity AR developer | Enterprise XR simulation | Unity training simulation | Serious game developer | Flutter iOS Android | Mobile app developer | Flutter MVP developer | LLM integration developer | AI chatbot mobile app | Flutter Node.js | Flutter full stack | Unity C# developer | Photon Unity multiplayer | Flutter in-app purchases | App Store submission Flutter | Flutter bug fix | Unity bug fix | Flutter web app | Flutter desktop | AR Foundation Unity | XR Toolkit Unity | Firebase Flutter | Flutter REST API | AI agent mobile app | Flutter Riverpod | Flutter BLoC | Flutter clean architecture

I build dynamic, responsive, and SEO-friendly web applications that not only look amazing but perform flawlessly. With expertise in React.js, Next.js, Vue.js, Node.js, Express.js, and MongoDB, I deliver full-stack solutions tailored to your needs. What I Do: ✅ Craft modern, interactive front-ends with React.js, Next.js, Vue.js, TypeScript, TailwindCSS, Bootstrap, Sass, Flowbite React, Mantine UI... ✅ Develop robust back-ends using Node.js, Express.js ✅ Handle databases & API integrations with MongoDB, Firebase, MySQL ✅ Ensure responsive design, smooth UX, and SEO optimization I’m client-focused, guaranteeing clear communication, seamless collaboration, and timely delivery from concept to launch. Whether it’s a cutting-edge web app, responsive website, or complete full-stack solution, I turn your ideas into reality with precision, creativity, and professionalism. 🆗 Let’s collaborate to make your web projects shine online!

I'm thrilled to introduce myself as a dedicated Bitrix24 CRM Specialist with a passion for problem-solving and business automation. My journey in the IT world has been driven by my love for adventure and exploration. Much like my hiking and camping trips through the mountains, my career has been a path of continuous learning and overcoming new challenges. I started my career as a graphic designer freelancer at 17, evolving into a full-stack WordPress developer with expertise in PHP, JS, and CSS. My independent learning and self-driven growth have shaped my unique skill set and excellent communication abilities. Fluent in English and adept at simplifying complex concepts, I ensure that my clients receive clear, actionable insights. Currently, I am a proud partner with Bitrix24, a leading Business Management Solution. My focus is on enhancing Bitrix24’s functionality through customized solutions and automation. Here’s how I can bring value to your projects: Customized Solutions and App Development: I have developed a range of internal and external apps for Bitrix24, tailored to meet unique business needs. From creating integrated systems for managing marketing campaigns to developing tools that synchronize data with third-party services, my solutions enhance the efficiency and capabilities of the Bitrix24 platform. Expert Data Migration: I specialize in preparing and migrating data into Bitrix24 using custom apps that leverage the REST API. My approach ensures high-quality, secure, and accurate data migration, accommodating the vast potential of Bitrix24’s capabilities while maintaining data integrity. Effective User Training and Support: My training methods include one-on-one sessions, workshops, and ongoing support to ensure your team transitions smoothly to Bitrix24. Although I don’t have formal documentation writing experience, I provide valuable notes and recommendations based on practical insights. Problem-Solving and IT Management: With extensive experience across various IT fields, I excel at addressing complex challenges and providing innovative solutions. My enthusiasm for learning and problem-solving allows me to adapt quickly and effectively to any project needs. Thank you for considering my profile. I look forward to the opportunity to help you leverage Bitrix24 to streamline your business operations and achieve your goals.

I help startups and growing businesses build production-ready AI and SaaS applications that scale reliably as their business grows. Tell me what you're building, and I'll help engineer a backend your business can confidently rely on—not just today, but as you scale. Send me an invitation or message, and I'll review your project and recommend the best technical approach before development begins. A little about me I help startups and businesses build scalable backend systems, AI-powered applications, and cloud infrastructure that are designed for production from day one. Whether you're launching a new SaaS platform, integrating AI into an existing product, or modernizing a growing application, I build software that's reliable, maintainable, and ready for real users. • Top Rated freelancer with a 100% Job Success Score • Upwork Certified in Python Development & Back-End Development • Production experience across AI applications, SaaS platforms, APIs, cloud infrastructure, and automation • End-to-end engineering—from architecture and development to deployment and long-term maintenance • Clear communication and engineering decisions focused on long-term business value If you're looking for an engineer who can help build software that's reliable, scalable, and ready for production, I'd be happy to discuss your project. 🔧 EXPERTISE AI SaaS Development | Django | Python | REST APIs | OpenAI | AWS | Docker | Terraform | PostgreSQL | Redis | Celery | Stripe | CI/CD | API Integration | Cloud Architecture

Most software works until it matters. I build the kind that works when it matters. Over the last 10+ years, I've built and maintained full-stack systems across React, Next.js, Node.js, TypeScript, PostgreSQL, Docker, and cloud infrastructure — SaaS platforms, AI products, automation systems, real-time applications, and complex integrations. My focus is usually the parts that are easy to get wrong: architecture that scales, integrations that recover, pipelines that catch problems before users do. Most recently, I led the engineering team at Inspira AI — frontend, backend, database, infrastructure, the full picture. I helped shape the platform into a more robust AI-powered SaaS product and owned the critical systems that kept it running. The CEO there recorded a video testimonial about working with me. He said: "Very technically precise, meticulous. He wouldn't let things pass if they were subpar. One of the things that impressed me most was his honesty and integrity." Before that, I spent years freelancing — building automation tools, desktop applications, and custom business software for clients across different industries. That's where I learned to build for real-world usage, not just demos. Clients usually bring me in when they need more than someone to code tickets. They need someone who can think through architecture, identify risks early, scope honestly, and deliver software that is clean, stable, and built to last. I can help with: • SaaS product engineering • React / Next.js / TypeScript development • Node.js backend systems and API design • PostgreSQL schema design and optimization • Stripe, Google APIs, and third-party integrations • Docker, CI/CD, and deployment workflows • Multi-tenant architecture and reliability improvements If you need a senior engineer who can take ownership of complex product work from architecture to delivery, send me the details.

𝗢𝗣𝗘𝗡𝗔𝗜, 𝗖𝗵𝗮𝘁𝗚𝗣𝗧, 𝗚𝗣𝗧-𝟰, 𝗖𝗵𝗮𝘁𝗯𝗼𝘁𝘀, 𝗣𝘆𝘁𝗵𝗼𝗻, 𝗟𝗮𝗻𝗴𝗰𝗵𝗮𝗶𝗻, 𝗟𝗹𝗮𝗺𝗮 𝗜𝗻𝗱𝗲𝘅, 𝗣𝗶𝗻𝗲𝗰𝗼𝗻𝗲, 𝗪𝗲𝗮𝘃𝗶𝗮𝘁𝗲, 𝗥𝗮𝘀𝗮, 𝗣𝗿𝗼𝗺𝗽𝘁 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴, 𝗗𝗼𝗰𝘂𝗺𝗲𝗻𝘁 𝗔𝗜, 𝗦𝘂𝗺𝗺𝗮𝗿𝗶𝘇𝗲 𝗱𝗼𝗰𝘂𝗺𝗲𝗻𝘁𝘀 𝘂𝘀𝗶𝗻𝗴 𝗔𝗜, 𝗚𝗣𝗧-𝟰 🚩Software engineer specializing in Machine Learning with 4+ years of experience building scalable web applications and internal tools that drastically improve efficiency. And a vast array of knowledge in many different front end and back end languages, responsive frameworks, databases, and best code practices. ⚡My competencies include but are not limited to: ✔️ A Vast experience in 𝐏𝐘𝐓𝐇𝐎𝐍 for Web Development , Data Analysis , Machine Learning , Web Scraping , API integration , Backend Logic , artificial intelligence , etc. ✔️ Writing Algorithms, make Django/Flask Web-Application, React/Angular/Vus.js Applications, Desktop ✔️ Application, Creating automated bot scripts, openAI and chatGPT-based solutions with 𝐏𝐘𝐓𝐇𝐎𝐍 & more. ✔️ Development of intuitive and cloud-based software products and applications using clean object-oriented design ✔️ Designing and creating RESTful APIs for internal and partner consumption ✔️ Building efficient RAG systems. ✔️Integrating various OpenAI services like Function Calling , Assistants , Tools , Structured output , embeddings ... ⚡𝐓𝐡𝐞 𝐦𝐚𝐢𝐧 𝐬𝐞𝐫𝐯𝐢𝐜𝐞𝐬 𝐈 𝐩𝐫𝐨𝐯𝐢𝐝𝐞: ✔️ Machine learning ✔️ Fine-Tuning ✔️ Web services ✔️ Python programming ✔️ OpenAI API integration ✔️ GPT 4 training and integration ✔️ Web-scrapping ✔️ Chatbot development using Botpress and DialogFlow ✔️ Web-development (mainly back-end) ✔️ Computer vision ✔️ Natural language processing ✔️ Desktop applications development ✔️ Transfer Learning ✔️ AI models training ✔️ Web Services ⚡ NLP tasks: ✔️ Text Generation and classification ✔️ Chatbot development using Botpress and DialogFlow and Integration in multiple channels( Twitter, Telegram, Messenger, Websites, Instagram, WhatsApp ..) ✔️Chatbots from knowledge base ✔️Langchain (Agents, indexes) ✔️Handling vector database operations like Pincone, Weaviate, FAISS, chromadb ⚡ Computer vision tasks: ✔️ Image Classification ✔️ Object detection using YOLO ✔️ Sematinc segmentation ⚡GPT tasks: ✔️ GPT Apps development using python GPT Langchain Pinecone Weaviate FAISS ✔️ Automation and integration using chatGPT API. ChatGPT API Integration. ✔️ Python solutions using Chatgpt API, Whisper API, GPT 3 model and other openai API services. ✔️ Integrating openAI's GPT 3, GPT 3.5, and GPT 4 API to take user prompts. ✔️ Prompt Engineer with a great experience in designing a variety of problems for a variety of AI Use cases. ✔️ Question answer using the GPT model over the document, OCR Technique. ✔️ 𝐂𝐡𝐚𝐭𝐁𝐨𝐭 𝐂𝐡𝐚𝐧𝐧𝐞𝐥𝐬: 🏆 Facebook ChatBot 🏆 Instagram ChatBot 🏆 Twitter ChatBot 🏆 Line ChatBot 🏆 Telegram ChatBot 🏆 WhatsApp ChatBot 🏆 Website ChatBot 🏆 Voice ChatBot 🏆 IVR ChatBot 🏆 SMS ChatBot 🏆 Email Bot ✔️CORE EXPERTISE • Custom AI Applications • AI Chatbots and Voice Systems • AI Email Systems • AI Social Media Manager • Business Automations • Strategic AI Consulting ✔️ TECH STACK • Back-end Mastery: Proficient in Node.js • Front-end Excellence: Skilled in React.js and Next.js • Python Expertise: Crafting powerful back-end solutions and automations ✔️ AI & AUTOMATION SPECIALTIES • ChatGPT & RAG Systems • LangChain & Llama Index • Voiceflow • Make.com & Zapier ✔️ 𝐀𝐝𝐯𝐚𝐧𝐜𝐞 𝐂𝐡𝐚𝐭𝐁𝐨𝐭 𝐩𝐥𝐚𝐭𝐟𝐨𝐫𝐦𝐬 𝐥𝐢𝐤𝐞: 🏆 Botpress 🏆 Voiceflow 🏆 Chatbase 🏆 Stack.ai 🏆 ManyChat 🏆 Chatfuel 🏆 Watson Assistant 🏆 LUIS 🏆 Amazon LEX 🏆 Meya.ai 🏆 Google Dialogflow 🏆 Twilio 🏆 Messagebird 🏆 Rasa 🏆 Xenioo 🏆 Twilio 🏆 PrimeChat ⚡Skills: Python, Python Script, Python Requests, Django, HTML5, CSS3, MySQL API Development, API Integration, Backend & Front Development, Java, Android, Tensorflow , Trading Bots , Azure , C , Pandas , Numpy , REST API, GUI, Tkinter , Pyqt , OpenAi , GPT-4, chatbot , GPT-3 , prompt engineering , GPT-3.5 Turbo , ChatGPT 4 , ChatGPT 3 , LLM, RAG, ALPCA, Llama 3, Llama, Knowledge base , Botpress, Dialogflow I will be happy to help you.