🟢 𝐀𝐕𝐀𝐈𝐋𝐀𝐁𝐋𝐄 NOW 👋 Hi there, I'm Artem! Need a developer to build a SaaS, MVP, or support a legacy system? I'm your full stack developer expert. With 15+ years as a Senior .NET Full Stack Developer, I plan, architect, and deliver high-performance applications that scale. Through my agency CodeLuxSolution and direct Upwork engagements, I've completed 66+ projects globally, transforming outdated systems into modern, blazor-powered solutions that drive user adoption and slash operational costs. ═══════════════════════════════════════════════════════════ 🏆 Why Our ASP.NET Core and .NET Developer Solutions Stand Out ⭐ 15+ years as a Senior .NET Full Stack Developer and Desktop Application specialist ⭐ 66+ custom projects delivered: 36 on Upwork, 30+ through enterprise contracts ⭐ Top Rated on Upwork with 100% Job Success Score ⭐ Leading projects for USA educational platforms serving 250k+ users after regulatory updates ⭐ Enterprise SaaS platforms in management and analytics spanning 20+ person teams ⭐ Desktop application migrations from WinForms to Blazor Server reducing deployment cycles to 1 second ⭐ ASP.NET WebForms to .NET Core migrations accelerating page load times by 100x (30s down to 0.5s) ⭐ High-load IoT systems optimized from 3 servers down to 1 server, cutting infrastructure costs 66% ⭐ ASP.NET MVC to RazorPages performance gains delivering 3x faster rendering ⭐ Blazor developer expertise enabling remote-first access and real-time data sync across 1000+ concurrent users ⭐ .NET Core microservices reducing deployment risk from multi-day windows to single-second updates ═══════════════════════════════════════════════════════════ 🚀 Services | ASP.NET Core and .NET Developer Expertise ▶ Enterprise SaaS Architecture - Scalable, Management and Analytics Focused ► ASP.NET Core microservices for high-load systems processing thousands of IoT requests per second ► .NET Core backend serving 250k+ users on educational platforms with zero downtime ► Blazor Server and Blazor WASM applications enabling remote access and cross-user data synchronization ► SQL Server optimization and EF Core entity mapping for complex domain logic ► Developer-led database scaling strategies reducing server footprint by 66% ▶ Legacy System Modernization - WebForms to Modern .NET ► ASP.NET WebForms to .NET Core rewrites accelerating page loads from 30s to 0.5s ► WinForms Desktop Application refactoring into Blazor Server reducing update cycles to 1 second ► ASP.NET MVC to RazorPages migration delivering 3x performance improvement ► Eliminate version conflicts across 1000+ users with web-based Blazor deployment ► .NET Framework to .NET Core infrastructure consolidation cutting infrastructure needs from 3 servers to 1 ▶ Custom Desktop Applications - WinForms and Windows Services ► WinForms application development for enterprise productivity tools ► Windows Services for background processing and system integration ► Desktop application architecture supporting offline and connected scenarios ▶ SaaS Platform Development - Full Stack from Concept to Scale ► ASP.NET Core APIs powering management and analytics SaaS dashboards ► Blazor components for real-time reporting and user collaboration ► .NET developer expertise in multi-tenant architecture and data isolation ► High-performance SaaS solutions serving thousands of concurrent users ▶ Specialized Modernization Services ► WinForms to Blazor Server conversion enabling work-from-anywhere deployment ► ASP.NET WebForms to .NET Core rewrites for systems handling high-load IoT data ► MetaTrader indicator development and NinjaTrader platform expertise ► Educational platform scaling from pilot to 250k+ user systems ► Fire safety and emergency management SaaS currently in development ═══════════════════════════════════════════════════════════ ⚙️ Workflow, Tech-Stack and Extra Value 🔍 Discovery and Requirements Analysis ► Understanding legacy system pain points and defining success metrics for migration projects ► Competitive analysis and user experience mapping for SaaS platforms 🏗️ Architecture and Design ► Mapping WinForms components to Blazor Server architecture ► Designing ASP.NET Core microservices for SaaS platforms ► Planning infrastructure consolidation strategies for high-load systems ► .NET developer best practices for scalability and maintainability 💻 Development and Integration ► C# as primary language chosen over Python for development velocity and C++ for performance parity ► ASP.NET Core | Blazor Server | Blazor WASM | RazorPages | .NET Framework legacy ► HTML5 | CSS | JavaScript | SQL Server | EF Core with advanced querying ► WinForms for Desktop applications | Windows Services | API development ► Integration with existing enterprise systems and third-party APIs ⚡ Performance Optimization ► ASP.NET WebForms to .NET Core refactoring reducing page loa

I specialize in WordPress Website Development and Custom WordPress Development & Design for businesses that need a fast, scalable, and conversion-focused WordPress Website. My work combines WordPress Website Design, Custom WordPress Website Development, Website Development, performance optimization, SEO structure, and clean content management. I don’t just build pages. I help turn a WordPress Website into a working business asset that generates leads, sales, and long-term value. More power with 'My ideal flow'™: Idea → Discovery → Prototype → Design → Development → Testing → Launch → Support. 12+ Years on Upwork $600K+ Total Earnings 200+ Satisfied Clients 80+ Jobs Completed 100% Job Success Score Top Rated Plus Freelancer “Dmitry is always solution orientated and a clear communicator. He is committed to the quality of the project and is very detail oriented. He is always held accountable for outcomes.” Client review For most clients, WordPress Website Development is not just about building pages. Good WordPress Website Development should include structure, speed, usability, SEO basics, and easy content management. My approach to WordPress Website Development is practical: first I understand the business goal, then I plan the content structure, then I handle design, development, testing, launch, and support. That is why my WordPress Website Development process often includes Custom WordPress Development, WordPress Website Design, Website Redesign, WooCommerce, Elementor, ACF, and performance optimization. I am a WordPress Developer, WordPress Website Expert, and Web Developer focused on Custom WordPress Development, WordPress Website Design, WordPress Elementor, WooCommerce, Website Redesign, Website Customization, WordPress Website Optimization, and WordPress SEO. Typical work includes: WordPress Website Development Custom WordPress Website Development Custom WordPress Development WordPress Website Design WordPress Design WordPress Elementor development WooCommerce and Ecommerce Website development Website Redesign Website Customization WordPress Website Optimization WordPress SEO structure ACF, flexible content, and custom admin systems Custom themes and WordPress Theme development WordPress Plugin customization API integrations with CRMs, marketing tools, payment systems, and automation platforms Front-End Development with HTML, CSS, JavaScript, and PHP Most of my projects go beyond standard brochure sites. Clients usually come to me when their current WordPress Website is slow, hard to manage, difficult to scale, or not converting visitors into leads and customers. Some projects require Custom WordPress Development with ACF, Options Pages, flexible content blocks, structured page systems, custom post types, and clean admin logic. Others need WooCommerce functionality, subscriptions, custom checkout flows, payment logic, product structures, or integrations with third-party platforms. From the design side, I focus on WordPress Website Design that supports real business goals: clear user flow, strong content hierarchy, responsive layouts, conversion-focused sections, and SEO-friendly structure. I also work on Website Redesign projects where the existing site already has traffic, but the design, performance, structure, or user experience is holding it back. In those cases, I rebuild the WordPress Website with better UX, better speed, better SEO structure, and easier content management. A large part of my work is built with WordPress Elementor when clients need speed, flexibility, and easy editing. For more complex projects, I use Custom WordPress Development instead of relying only on builders. My projects often include: Custom WooCommerce functionality Performance optimization and Core Web Vitals Large or complex WordPress Websites Multi-language and multi-site structures Advanced ACF usage Gutenberg and custom blocks API integrations Plugin conflict debugging Server-level and database-level issue solving Responsive Front-End Development At the core, every project combines three things: WordPress Website Development, WordPress Website Design, Custom WordPress Development. Not as separate services, but as one system that impacts revenue, user behavior, speed, search visibility, and long-term scalability. I work as a WordPress Developer and WordPress Designer for WordPress Website, WordPress Development, Elementor, WooCommerce, SEO, Website Design, Web Development, and conversion-focused builds. If you are looking for a WordPress Website Developer, WordPress Development Expert, Web Developer, or Website Design partner who can handle both design and development, I can help you plan, build, optimize, and support your WordPress Website from idea to launch. Wordpress Elementor custom dev

Backend and full stack systems that handle real money, real transactions, and real scale. 🏦 $6.8M seed funding raised by a product built on my backend infrastructure 🔗 15+ projects shipped on Upwork ⚙️ 7+ years building APIs, payment flows, and Web3 integrations 🚀 From architecture to production - clean, maintainable, built to last Senior Backend and Full Stack Developer specializing in FinTech infrastructure, blockchain integrations, and scalable API systems. I work with startups and established teams that need backend done right: payment flows, crypto wallets, KYC/AML pipelines, DeFi protocols, and high-load REST and GraphQL APIs. My core stack is Node.js, Express, and NestJS. I've shipped production systems handling real financial transactions across Stripe, ACH, Apple Pay, Google Pay, Fireblocks, Coinbase API, and Bridge.xyz. On the blockchain side: Solidity, Ethers.js, Web3.js, Polygon, Ethereum, Solana, Gnosis Safe, and Moralis. I also cover the full stack with React, Next.js, and TypeScript - no handoff gaps, faster delivery. 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐬 𝐈'𝐯𝐞 𝐛𝐮𝐢𝐥𝐭: Blockchain FinTech Platform - a Spanish blockchain-first fintech platform for crypto and fiat asset management that raised $6.8M in seed funding. Built backend infrastructure for multi-wallet management, crypto tax calculation, team collaboration features, and crypto-friendly banking integration. Stack: NestJS, Moralis, WalletConnect, Web3React, Snapshot. Debt Collection & Payments Platform - a debt collection platform with comprehensive payment infrastructure. Integrated Stripe, ACH, Apple Pay, Google Pay, Buy Now Pay Later, and partial payment flows. Connected Salesforce CRM, QuickBooks, and Xero. Built data visualization dashboards with Recharts for real-time financial reporting. DeFi Prime Brokerage - service built on Solana, powered by Serum's on-chain order book infrastructure. Responsible for API architecture, blockchain integration, and frontend connectivity. 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: - Scalable REST and GraphQL APIs with Node.js, Express, NestJS - Blockchain integrations: Ethereum, Polygon, Solana, smart contracts - Crypto wallet infrastructure: Fireblocks, Coinbase API, Gnosis Safe, Moralis - Payment systems: Stripe, ACH, Apple Pay, Google Pay, BNPL, crypto-fiat - KYC/KYB flows: Sumsub, identity verification pipelines - AML compliance: Elliptic, transaction monitoring - DeFi protocols, DEX integrations, dApp backends - FinTech infrastructure: Bridge.xyz, Rain.xyz, Kraken API - Database architecture: MongoDB, PostgreSQL, Supabase, Firebase - Cloud infrastructure: AWS, Azure, Google Cloud, CI/CD pipelines - Full stack coverage: React, Next.js, TypeScript 𝐓𝐞𝐜𝐡 𝐬𝐭𝐚𝐜𝐤: - Backend: Node.js, Express.js, NestJS, REST API, GraphQL - Frontend: React.js, Next.js, TypeScript, Tailwind CSS - Blockchain: Solidity, Ethers.js, Web3.js, Polygon, Ethereum, Solana FinTech: Fireblocks, Coinbase API, Kraken, Gnosis Safe, Bridge.xyz, Rain.xyz, Moralis, Elliptic, Sumsub - Payments: Stripe, ACH, Apple Pay, Google Pay, BNPL Databases: MongoDB, PostgreSQL, Supabase, Firebase - Infrastructure: AWS, Azure, Google Cloud, CI/CD, Docker I've worked across roles: Senior Backend Developer, Full Stack Developer, Web Developer, Node.js Developer, NestJS Developer, Express Developer, Blockchain Developer, Web3 Developer, DeFi Developer, FinTech Developer, Full Stack Developer React Node, API Developer, Crypto Wallet Developer, Payment Integration Developer, Backend Architect. The backend is where products either scale or break. Let's make sure yours scales. Message me, and we’ll review your project together.

$53M+ Raised by Clients | 84+ Products Delivered | 100% Job Success | 14 Years in SaaS ✅ 14 years as CTO & Founder of Gearheart, Enterprise SaaS product development studio ✅ Co-Founder & CTO at Beyond the Wow, an AI-native MVP studio ✅ Helped 84+ startups and growth-stage SaaS teams scale their products ✅ Built SmartSuite from scratch — $38M raised, 7M+ users ✅ 2–4x faster delivery using Claude Code, Lovable, Cursor, and Replit ✅ Top Developer at Clutch and Goodfirms I'm a CTO with 20 years of engineering experience, specializing in Python Full Stack Developer SaaS and Full Stack Developer React architecture. I've learned that most founders don't fail because they can't build, they fail because they build the wrong thing. My job is to make sure that doesn't happen to you. As an MVP Developer, I focus on SaaS architecture and MVP Development — taking products from idea to live in weeks. My team delivers Full Stack Developer React and Python engineering with AI API Integration built in by default. Behind me is a team of 23 senior engineers with 14 years in SaaS — together we've shipped 84+ products for 70+ clients across 7 countries. Whether you need AI SaaS Development, a lean SaaS MVP, or full-scale SaaS Business Development — we bring both the speed and the engineering depth to make it production-ready. 🌟OUR ENGINEERING STANDARD Our standard for MVP Development comes from Gearheart, where we've spent 14 years as a SaaS Developer studio building enterprise products: - SmartSuite — SaaS Developer and MVP Development from scratch: $1.2M ARR in 4 weeks, $38M raised, trusted by Capital One. Coordinated with up to 4 external teams simultaneously - Globalli — Python Full Stack Developer SaaS and SaaS Developer project: HR/payroll across 125+ countries, SOC2 Type II, $15M raised. 15+ modules, 21 engineers at peak, 3 years 🔧 WHAT I CAN HELP YOU WITH - Discovery & Prototype: For every MVP Developer engagement — clickable prototype in 5 days using AI Development tools: Lovable, Replit, Cursor - Rescue Diagnosis: Code broken in production? Full review by senior Full Stack Developer React and AI Development engineer. QA, security audit, sprint plan - MVP & Landing Page: MVP Development in 3 weeks — 2–4x faster than traditional agencies. AI API Integration, auth, onboarding, deployment included - Sprint Subscription: Ship features on a regular sprint pace. Your long-term Full Stack Developer React, SaaS Developer and MVP Developer partner ⚡ OUR MVP SPEED - Legal SaaS platform + AI API Integration knowledge base → ~2 months - AI Receptionist with AI API Integration + CRM → shipped in weeks - B2B Dental Referral SaaS — MVP Developer delivery → 3 weeks - Medical device MVP Development — ICP + PMF + build → 2 weeks 💡WHY WORK WITH ME - Product Thinking First: We start at "should you build this?" not "what do you want us to build?" Most developers skip this entirely. We don't - AI Speed, Engineering Quality: We use Claude Code, Lovable, and Cursor as engineers, not prompt writers. AI Development is 2–4x faster without sacrificing production readiness. Need AI SaaS Development or MVP Development? We do both - We're Startup Founders Too: As founders ourselves, we know firsthand the challenges you're facing — including where AI Development fits and where it doesn't - Offshore Pricing, Enterprise Standard: Ukraine-based SaaS Developer team. Competitive pricing. Enterprise-level SaaS Developer quality — delivered by Python Full Stack Developer SaaS and Full Stack Developer React engineers who've built at scale Our team has delivered AI SaaS Development projects, Full Stack Web Developer builds, and App Developer with AI integrations — enterprise standard Our engineers cover the full stack: Software Developer tooling, REST API architecture, Web Developer interfaces, App Developer delivery. Whether you need a React Developer who owns the full product or a team that scales with you — we've done it both ways. We've worked with 70+ clients as an MVP Developer and SaaS Developer team — from early-stage founders to growth-stage companies across 7 countries. 30% return for their next product. Our Python Full Stack Developer SaaS and Full Stack Developer React engineers have built systems where AI Development is not optional — it's the delivery model. AI API Integration is embedded in every MVP Development sprint from day one. As an MVP Developer team: $400K+ on Upwork | 100% Job Success. AI Development and Python Full Stack Developer SaaS approach gives you depth without agency overhead. ⚙TECH STACK AI & Integration: AI API Integration: Claude Code, OpenAI, FastAPI, LangChain Frontend: Full Stack Developer React: React, TypeScript, Next.js, Vue.js Backend: Python Full Stack Developer SaaS: FastAPI, Django, Node.js, GraphQL, PostgreSQL DevOps: AWS, DigitalOcean, Docker, Kubernetes Every Python Full Stack Developer SaaS project we take on includes MVP Developer speed, AI Development, and AI API Integration by default

✅ Top-Rated Plus on Upwork ✅ 100% Job Success Score ✅ 50+ SaaS Projects Delivered 𝗔𝗩𝗔𝗜𝗟𝗔𝗕𝗟𝗘 𝗧𝗢 𝗦𝗧𝗔𝗥𝗧 𝗧𝗢𝗗𝗔𝗬! 🧩 Updated daily. 🧩 Fast delivery. 🧩 Flexible engagement. 🧩Production-ready code. 🧩 Scalable architecture. 🧩 Personalized approach to each project. 𝗢𝗩𝗘𝗥𝗩𝗜𝗘𝗪 🏆 7+ years of experience as a Full Stack Developer and SaaS Engineer 🏆 50+ products delivered, web apps, SaaS platforms, AI systems, and enterprise tools 🏆 Strong background in multi-tenant SaaS, dashboards, AI integrations, and complex business logic 🏆 Expert in Node.js, Python, React, Next.js, PostgreSQL, and AI APIs 🏆 Always deliver production-ready, scalable, and maintainable code 🏆 Final delivery includes clean architecture, documentation, and deployment 𝗔𝗕𝗢𝗨𝗧 𝗠𝗘 👋 I'm a Senior Full Stack Developer at Indeema, a full-cycle software and AI development agency trusted by startups, scale-ups, and enterprise teams. 💚 My best clients include Urban Dictionary, NOKIA, AWS, STADLER, FuboTV, Riverside. Drop me a message with "𝗙𝗨𝗟𝗟 𝗦𝗧𝗔𝗖𝗞" we'll run a free discovery call and create a clear step-by-step plan without making expensive mistakes. 𝗪𝗛𝗔𝗧 𝗠𝗬 𝗖𝗟𝗜𝗘𝗡𝗧𝗦 𝗦𝗔𝗬 ⭐⭐⭐⭐⭐ "Igor delivered exactly what we needed — clean code, clear communication, and on time. Will definitely work with him again." — Long-term client, Upwork ⭐⭐⭐⭐⭐⭐ "Outstanding Full Stack Developer. He took full ownership of the project, suggested smart architecture decisions, and delivered a production-ready platform we're proud of." — SaaS client, Upwork 𝗜𝗡𝗗𝗨𝗦𝗧𝗥𝗬 𝗘𝗫𝗣𝗘𝗥𝗜𝗘𝗡𝗖𝗘 ⚡ Healthcare: HIPAA-compliant platforms, remote patient monitoring, clinical dashboards, medical IoT ⚡ FinTech: Multi-tenant financial SaaS, AI-driven analytics, real-time data pipelines ⚡ Real Estate: AI-powered property platforms, automated workflows, market intelligence ⚡ HoReCa: Restaurant and hotel management SaaS used by 50+ businesses across the UAE ⚡ Logistics: Operational tracking, fleet management, backend automation ⚡ B2B & B2C: Enterprise internal tools and consumer-facing web applications 𝗪𝗛𝗬 𝗖𝗛𝗢𝗢𝗦𝗘 𝗠𝗘 🔎 Multi-tenant SaaS platforms built to scale from day one 🔎 AI integrations that ship to production, not just demos 🔎 Frontend and backend owned end-to-end — no handoff delays 🔎 Complex multi-role workflows, permission systems, and business logic 🔎 Clean API design and solid data modeling in Node.js and Python 🔎 A reliable senior partner, not a vendor who disappears after launch 𝗡𝗨𝗠𝗕𝗘𝗥𝗦 𝗧𝗛𝗔𝗧 𝗠𝗔𝗧𝗧𝗘𝗥 🚀 7+ years building production-ready SaaS and AI systems 🚀 50+ products delivered from MVP to enterprise scale 🚀 Consistently 5-star client reviews 🚀 100% Job Success Score 𝗧𝗘𝗖𝗛 𝗦𝗧𝗔𝗖𝗞 📝 Frontend: React, Next.js, TypeScript, Tailwind 📝 Backend: Node.js, Python, FastAPI, REST, GraphQL 📝 Databases: PostgreSQL, Supabase, MongoDB 📝 AI: Claude API, OpenAI, LangChain, RAG pipelines 📝 DevOps: AWS, Docker, CI/CD, GitHub Actions 📝 Tools: Jira, GitHub, Copilot, Figma 𝗞𝗘𝗬𝗪𝗢𝗥𝗗𝗦 Full Stack Developer, SaaS Developer, Node.js, Python, React, Next.js, MERN Stack, PostgreSQL, Supabase, REST API, GraphQL, AI Integration, OpenAI, Claude API, LangChain, RAG, Multi-tenant SaaS, Dashboard Development, HIPAA, FinTech, HealthTech, Real Estate, B2B SaaS, MVP Development, Enterprise Software, Web Application, Mobile App, Backend Developer, Frontend Developer, AI Developer Updated: 10.06.2026

I focus on helping startups and businesses to leverage AI and adapt to modern software industry which is now more accessible than ever. That includes full-stack development, AI automation, prototyping, custom development and of course taking over what you already built and turning it into production grade solution. 🔐 𝗞𝗲𝘆 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀: 1. Full-stack development — end-to-end product building, front to back 2. AI automation — streamlining workflows and processes with AI 3. Prototyping — fast, working proof-of-concepts to validate ideas 4. Hardening — taking over what you've already built and turning it into a production-grade solution 🌠 My background is in custom software development, and I spent a while working as a hands-on engineer. I was lucky enough to spend my entire career working with fast-growing, large-scale, and enterprise clients, representing an outsourcing vendor. 🌌 Apart from development activities, I was engaged in many others: interviewing engineers, participating in pre-sales, training programs, leading and driving development processes, and much more. I was always a company guy and was interested in and open to everything. 👴🏻 That’s where I matured as an engineer. I learned a lot along the way, saw how painful the software development process could be, and understood the pros and cons of different organizations, including where Fortune 100 companies struggle. 📺 I’m a professional engineer focused on delivering business outcomes for you — not a part-time freelancer juggling Upwork with a full-time job or doing it for extra income. I'm working with all types of clients and budgets. ✅ 99% Job Success Score; 100 + projects delivered — from idea to production-ready software 🛡 Expert-Vetted — interviewed and approved by the Upwork team 🚀 Fastest-Growing Upwork Profile Globally — $4M+ earned across multiple profiles since 2022 🌍 Most Recognized & Viewed Upwork Profile Worldwide 💰 Scaled 5 Upwork Profiles to $300K+ revenue each with strong inbound leads 🏢 Delivered Projects for Fortune 100 & Inc. 5000 Companies and UAE government 🧠 Led Pre-Sales, Estimations, Code Reviews & Tech Interviews for top-tier clients 💻 Even if we don’t end up working together, I’ll help you identify risks and guide you on how to make the product happen — because in the end, it’s all about mindset, not just coding skills. 💡 Answering a question how am I different in this competitive AI industry — the answer is simple: mindset. You can learn endless frameworks, libraries, languages — alright, cool, but mindset and deep understanding of this world outside and inside the industry is what really makes a difference. Keywords: Full Stack Development, Full Stack Developer, Web Application, SaaS Platform, MVP Development, React, Next.js, Node.js, TypeScript, REST API, API Integration, PostgreSQL, MongoDB, Authentication, User Management, Admin Dashboard, Backend Services, Payment Integration, Stripe Integration, Subscription Management, Role-Based Access, Scalable Applications, Production-ready, Performance Optimization, System Architecture, Enterprise

Web development is what I genuinely enjoy and have been doing professionally for more than 12 years I specialize in building reliable, scalable, and maintainable web applications with a strong focus on clean architecture and long-term support. I’m a senior PHP developer who values code quality, clear communication, and predictable delivery ⚙️ I write clean, efficient, and well-structured code and follow best practices and design patterns. What I work with most often: 🔹 Custom web applications and business systems 🔹 RESTful APIs and third-party integrations 🔹 E-commerce platforms and payment integrations 🔹 Long-term projects with ongoing development and support Core technologies and expertise: ✅ PHP (OOP, Design Patterns, TDD, REST APIs) ✅ Laravel (Nova, Filament) ✅ Symfony ✅ Vue.js / React / TypeScript ✅ MySQL / PostgreSQL ✅ JavaScript (Highcharts, Three.js, Maps, Clouds) ✅ HTML5 / CSS3 (Bootstrap, SCSS, Tailwind) ✅ AI Models and Agents (GPT, Gemini, Claude, Local LLM) Integrations and platforms: 🔗 Payment systems: Stripe, Worldpay, PayPal, eBay 🔗 APIs: Google, Instagram, OpenAI and other third-party services 🔗 E-commerce feeds: Google Shopping, Amazon, eBay How I work: 📌 Full software development lifecycle experience 📌 Clear communication and regular progress updates 📌 Transparent estimates and task breakdown 📌 Focus on long-term maintainability, not quick hacks I’m open to interesting projects and long-term cooperation 🤝 If needed, I’m also open to a small test task to demonstrate my approach and code quality. Let’s turn your idea into a solid, working solution 🚀

Need a mobile app built that holds up after launch? I lead mobile app development that ships production-ready iOS and Android apps that survive real users - several are live on the App Store and Google Play right now. I'm Oleksandr, founder and lead engineer at Kultrix, an AI and Mobile App Studio, working from Lviv. Most of our work is React Native mobile app development, plus the AI features and backend that make an app actually useful. I run engagements as a long-term technical partner, not a vendor you chase for updates - which is why several engagements have run 16 months to 4+ years. You get senior engineering ownership from first call to store release: clear scope, milestone-based delivery, honest timelines, and a lead who is accountable for the result. As founder and lead engineer, I make sure the mobile app development gets done right, not just fast. WHAT WE BUILD - Full mobile app development in React Native and Expo, from idea to store release - a cross-platform iOS and Android app from one codebase, typically a launched MVP in 6-10 weeks. With a senior React Native developer leading, we cover MVP development, App Store and Google Play submission, and everything in between. - AI integration inside mobile apps - chat, image and vision analysis, and conversational voice (OpenAI and Anthropic Claude), already shipped in live AI mobile apps. Clean API integration so the AI feature feels native, not bolted on. - Rescue and refactor of React Native apps that broke under real users - performance, crashes, and stability work to get an existing app back to store-ready. - Backend when your app needs more than screens: Node.js, NestJS, Python and FastAPI, PostgreSQL, MongoDB, Firebase, and Supabase (including auth and RLS). WHO IT IS FOR - Starting from scratch: a clear path from idea to a launched MVP in 6-10 weeks, built by a team that has shipped to both stores. - Already have an app: mobile app development help with new features, performance, and stability - whether you need an iOS developer, an Android developer, or both. - Want to add AI: a chat, vision, or voice feature shipped into your live cross-platform app through careful AI integration, scoped so it ships fast and stays maintainable. HOW WE WORK You talk to the people building your app, not a sales layer. We agree on scope and milestones up front, you see working builds early and often on TestFlight and internal tracks, and you get honest status instead of silence. When something is harder than estimated, you hear it early - with options, not surprises. The goal is a stable app you can grow on, and a codebase your next mobile app developer can read without a rewrite. VERTICALS WE KNOW We have shipped mobile app development work across health and wellness, nutrition, and fitness (calorie tracking, meal analysis, AI coaching), fintech and Web3 (payments, Plaid, Polygon on-chain apps), SaaS (Stripe billing and dashboards), and internal tools and logistics (warehouse and operations systems). If your app lives in one of these spaces, we have built and launched something close to it. RESULTS - An AI nutrition tracker - React Native meal and calorie analysis with Anthropic Claude and OpenAI - live on both the App Store and Google Play, owned end to end (mobile, API, and admin). - An AI fitness app on a Python and FastAPI backend with OpenAI, live on the App Store and Google Play. - A conversational-voice health app built with React Native, Expo, and Claude. - A Web3 scratch-card app on Polygon with Plaid integration, live on Google Play, plus a daily-quotes app on the App Store. - A warehouse operations system that runs 4x faster for 100+ employees. - Long-term mobile app development engagements kept for 16+ months and 4+ years - the clearest signal that this work lasts. OUR STACK React Native, Expo, TypeScript for cross-platform iOS and Android; Node.js, NestJS, Python and FastAPI, PostgreSQL, MongoDB, Firebase, and Supabase on the backend; Stripe, in-app purchases, push notifications, and WebSockets for real product features; and AI APIs (OpenAI and Anthropic Claude) for chat, vision, and voice. This is the full toolkit for modern mobile app development and AI integration, from first commit to a stable app on the App Store and Google Play. Send me your idea or your existing app and you will get back a clear, honest breakdown - what to build first, what can wait, and a realistic timeline for the mobile app development. No pressure, no jargon, just a straight answer from the lead who would own the work. Oleksandr - founder and lead engineer, Kultrix (AI and Mobile App Studio).

🏆 Top Rated Plus (Top 1% Upwork talent) ☕ Started working as web developer in 1999 🔥 Expertise in front-end, back-end, and server administration 🔐Always keeping in mind security and productivity aspects 🎓Master and bachelor degrees in computer science Let's make your project successful! 🚀🚀🚀

Most AI projects fail because the infrastructure around them wasn't built to last. I'm an AI developer and Python developer who fixes that. I build RAG pipelines, AI Agent systems, and the backend architecture they need to actually run in production. When a project demands it, I bring in a trusted Python developer I've worked with long-term. Having a second Python developer and a second AI developer on call means you get the output of a full team without the overhead of managing one. 1. AI Systems That Go Beyond the Prototype As an AI developer, I design and implement custom RAG (Retrieval-Augmented Generation) pipelines that ground your LLMs in proprietary data: eliminating hallucinations and making responses genuinely useful. I build autonomous AI Agent frameworks that execute multi-step workflows without human input. Whether that means PyTorch for a custom machine learning model, TensorFlow for a deployment-optimized pipeline, or combining PyTorch and TensorFlow across different stages of the same system or computer vision for document parsing and image classification — I choose the right tool, not the trendiest one. My data scientist background means I treat model evaluation as seriously as model building. Nothing ships until the benchmarks prove it works. Every web development project I deliver goes through the same data scientist discipline: measure, validate, ship. 2. The Backend That Holds It Together A great AI developer still needs solid engineering underneath. As a Python developer, I build the infrastructure that makes AI systems reliable at scale: FastAPI and Django REST APIs, Flask microservices for lightweight integrations, Flask-based task queues for async jobs, PostgreSQL and MySQL schemas built for real data volumes, SQL queries optimized for performance, Docker-containerized services deployed through CI/CD pipelines with Git-managed version control. Data Scraping and web scraping are core to how I keep models current. I build Scrapy pipelines that continuously pull structured data from the web and load it into PostgreSQL or MySQL. That means your AI developer's models are always working with fresh information. I also use Scrapy for competitive research and e-commerce intelligence. Airtable provides non-technical stakeholders visibility into those Data Scraping pipelines, and Airtable webhooks trigger FastAPI or Django endpoints when records change. 3. Full Stack, Front to Back I'm a full stack developer and web developer, which means I own the entire delivery. React dashboards, Node.js middleware, JavaScript-heavy interfaces. I build the frontend that makes AI outputs accessible to real users. As a software engineer with web development experience across the full stack, I keep React components, Node.js services, and JavaScript logic clean and maintainable alongside the Python backend. I also have PHP developer experience. Many clients have existing PHP developer codebases, legacy CMS platforms, older systems that need to connect to modern Python APIs rather than be replaced. I know how to work with what's already there. 4. What Working With Me Looks Like You get a Python developer and AI developer in one person, backed by a trusted Python developer when the scope demands it. You get production-ready code - documented, tested, Git-managed, containerized with Docker, deployed through CI/CD. You get a data scientist mindset applied to every decision, a software engineer's standards applied to every line, a full stack developer's awareness of the full delivery chain, and a web developer's understanding that the end user is always the point. If you need an AI developer and Python developer who can take a project from first conversation to live deployment, I'd like to hear about it.