Hire the Best Software Development Professionals

I help funded startups and growing SaaS companies build AI-powered products and mobile apps that are engineered to scale — not rebuilt six months later. Over 12+ years and 8,000+ hours on Upwork (98 projects, $200K+ delivered), I've shipped production SaaS platforms, marketplaces, booking systems, dashboards, and mobile apps for iOS and Android — combining clean architecture, strong UX, and practical AI automation. My focus isn't just writing code; it's helping you launch faster, cut manual work, and ship something your next hire won't need to rebuild. I've built platforms across SaaS, booking systems, marketplaces, dashboards, automation tools, and mobile apps for iOS and Android. Whether you need a new MVP, a multitenant SaaS platform, or an existing product modernized with AI, I can help you turn your idea into a reliable, maintainable solution. My core services include: • AI SaaS Development • AI-Powered Web & Mobile Applications • Flutter App Development • React Native App Development • SaaS MVP Development • Mobile App MVP Development • Node.js Backend Development • REST API & API Integration • Third-Party API Integrations • AI API Integration • ChatGPT / OpenAI API Integration • AI Automation & AI Features • Firebase & Cloud Backend Development • App Deployment & Store Launch I work with Flutter, React Native, Node.js, JavaScript, TypeScript, Firebase, REST APIs, and AI APIs to build scalable products with clean architecture and a smooth user experience. If you need a developer who understands both product goals and technical execution, send me a message and let's discuss your project.

Top Rated · 100% Job Success · You keep full ownership of everything I build. I am a full stack developer, database architect, and SaaS developer. I design scalable database systems, build production-ready web applications, and integrate AI into products that work for real users. Full stack developer. Next.js. TypeScript. End to end. As a full stack developer I own the entire stack PostgreSQL schema design, Node.js backend, Next.js and React frontend, REST API integrations, Stripe payments, and Vercel deployment. Need a full stack developer who takes ownership from database to deployment without hand-holding? Let's talk. Recent full stack work includes a multi-tenant property management SaaS on Next.js and Supabase with role-based access, admin dashboards, and OpenAI integrations and a freelance marketplace with a GraphQL API layer, BullMQ background job queues, and row-level security enforcing per-user data isolation across clients and freelancers. Database architect. PostgreSQL. Supabase. SQL. Production-grade. As a database architect I design schemas from scratch normalization, ERD modelling, indexing strategies, query optimization, and Row Level Security policies. I migrate businesses from messy Excel and Google Sheets into clean, scalable PostgreSQL and Supabase systems with zero data loss and full audit trails. Recent database work includes a fuel business management platform with complex relational schema covering customers, orders, deliveries, invoicing, and payment cycles and a POS system with real-time inventory tracking, sales reporting, and automated invoice generation, all built on Supabase and PostgreSQL. Backend developer. Node.js. NestJS. REST APIs. As a backend developer I build structured, scalable Node.js and NestJS APIs with TypeScript end to end modular architecture, dependency injection, guard-based authentication, and clean REST API layers. I design and implement authentication flows, role-based access control, webhook handling, and background job processing for production applications that need to scale reliably. SaaS developer. Multi-tenant. Stripe. Production-ready. As a SaaS developer I build complete products end to end authentication, database, Stripe subscriptions and webhooks, dashboards, role-based access, and deployment. I have delivered a business management platform with automated PDF invoicing, cron-based billing cycles, and email dispatch via Resend; a wedding management system with client records, fare packages, and booking history; and a lead management dashboard with WhatsApp automation via ManyChat and automated drip campaigns. AI developer. OpenAI. Claude API. LLM integrations. As an AI developer I integrate LLM APIs into production applications document processing pipelines, AI-powered workflow automation, structured prompt engineering, and AI-assisted data extraction. All API keys handled server-side, never exposed to the browser. I have built OpenAI and Claude integrations into SaaS platforms delivering real features, not demos. Security. Supabase RLS. Multi-tenant isolation. I implement Row Level Security on every Supabase project enforcing per-user and per-tenant data isolation at the database level, not just the application layer. RLS policies, protected API routes, secure file access via signed URLs, and environment variable hygiene are standard practice on every project I deliver. Integrations. Automation. Third-party APIs. QuickBooks API integration for financial data sync into web dashboards. Airtable integrations. ManyChat and WhatsApp API automation. Resend for transactional email. Stripe checkout, subscriptions, webhooks, and billing portals. REST API development and third-party service connections across every project. How I work: Daily updates, no ghosting. Honest timelines. 30+ hours per week. 0–4 hour response time. I use Cursor and Claude Code daily to move fast without cutting quality. Full code ownership transferred on every handover. Stack: PostgreSQL · Supabase · SQL · pgvector · MongoDB · Prisma · Redis · Next.js · React · Nest.js · TypeScript · JavaScript · Tailwind CSS · Shadcn UI · Stripe · OpenAI · Claude API · Node.js · Express · Docker · Vercel · Railway · AWS · Cloudflare R2 · QuickBooks API · Airtable · ManyChat · WhatsApp API · Resend · GraphQL · BullMQ · REST APIs Message me with what you need database design, SaaS build, AI integration, or all three. I'll give you a straight answer on whether I can help and how long it takes.

Most SaaS and marketplace builds don't fail in the code. They fail in the parts nobody planned: billing, payouts, permissions, and the edge cases that surface after launch. I plan for those from day one. Top Rated Plus. $200K+ earned. Clients who stay for years. WHAT I BUILD - SaaS platforms: multi-tenant architecture, subscriptions and billing, roles and permissions, admin dashboards - Marketplaces: multi-vendor platforms, listings and search, bookings, commissions, vendor payouts, reviews - Custom software: CRMs, client portals, internal tools, quoting, scheduling and inventory systems - AI features: in-app AI assistants connected to your product and its data, plus AI integrations that automate specific tasks and workflows - Integrations: Stripe and payment gateways, CRM/ERP APIs, webhooks, third-party services HOW I WORK I don't start with code. I start with how your business makes money and where the process breaks. Then I tell you what to build first, what to simplify, and what isn't worth building at all. You get one lead who owns the architecture and the decisions, backed by a team that builds fast. STACK Laravel, PHP, React, Vue.js, Inertia.js, Livewire, Tailwind CSS, MySQL, PostgreSQL, Redis, REST APIs, OpenAI API NEXT STEP Send me what you're building and where it's stuck. I'll tell you how I'd build it, what it will take, and whether it's worth doing.

Your product and business idea deserve more than "a developer" — they deserve a technical partner who owns the outcome. 🏆 Top Rated · 194 completed projects · 143 reviews · 4.9★ average since 2013 ⭐⭐⭐⭐⭐ "I was very satisfied with Igor's work. He understood our requirements very well and translated them into a solid, high-quality app. Communication was always clear and reliable, and the support after launch was excellent. On top of that, Igor is fun to work with." — verified Upwork client, September 2026 I'm the right fit for: — A SaaS founder moving from idea or prototype to a production-ready product — A B2B company that needs a custom platform, internal tool, or client portal — A startup or scaleup that needs a reliable technical partner, not just a developer — A company that needs HIPAA-ready, GDPR-compliant, or NDA-protected development (MSA available on request) — An e-commerce brand outgrowing its current setup (Shopify Plus, headless, or custom) — see the e-commerce case studies in my portfolio below ⚡ HOW I USE AI IN MY DEVELOPMENT WORK AI speeds up execution — I own the architecture and every key decision. • Development: Claude Code for implementation, Codex for code review • QA: Quality Gate, my own AI agent, catches bugs and security risks before human review • Testing: AI-generated test cases for faster, broader coverage • Documentation: AI-assisted docs, kept in sync with the actual code WHAT I BUILD ✔️ Full-Cycle SaaS & B2B Product Development Architecture, UI/UX, backend, infrastructure, AI integration — built to handle growth from day one, so you avoid expensive rewrites later. Stack: React, Next.js, Node.js, NestJS, Python, Django, PostgreSQL, AWS. ✔️ AI Integration OpenAI, Google Vertex AI, and custom ML pipelines built into your product — chatbots, smart search, recommendation engines, process automation. AI as a real business feature, not a demo. ✔️ B2B Web Platforms Marketplaces, client portals, CRMs, LMS, internal tools — systems that connect your users, data, and business processes in one place. ✔️ E-Commerce (Shopify / WooCommerce / Headless) Custom storefronts, Shopify apps, WooCommerce platforms, headless commerce with Hydrogen or Strapi. Built for conversion, performance, and ease of management. FEATURED PROJECTS ✅ AI Agent Code Review System Quality Gate is a 7-phase multi-agent pipeline for automated code review across backend, frontend, and ML repos. Review cycle time cut by ~70% (1–2 weeks → ~5 hours), ~95% accuracy catching bugs and security risks. Stack: Python, multi-agent orchestration, 12+ linters. ✅ Multi-Tenant B2B SaaS for Managed FinOps Took the platform EverythingCloud from MVP to a production SaaS solution now used for AWS cost management and Managed FinOps services by MSPs; later led a full UI/UX redesign for a more modern interface and expanded functionality. Stack: React, Node.js, Python, AWS. ✅ AI-Powered Data Generation SaaS (OpenAI API) RNDGen is my own product, designed and built from scratch, now in beta. Generates realistic synthetic and rule-based test data across 100+ field types, 3 output formats (CSV, JSON, XLSX), and 5 generation modes, from fast fake-data to AI-driven synthetic datasets. Stack: React, Node.js, OpenAI API. ✅ Voice & Text Chatbot (ElevenLabs API) Contributed to the development team building Eternal AI, an OpenAI-powered conversational platform letting users chat with AI-generated personas of historical figures, with both text and voice interaction modes. Stack: React, Node.js, OpenAI API, ElevenLabs API. WHY CLIENTS CHOOSE ME ✓ One point of contact for the entire build — no need to coordinate multiple freelancers ✓ Client-endorsed, most frequently, for: Committed to Quality (52), Clear Communicator (34), Collaborative (28), Reliable (22) ✓ Regular updates and working builds, tailored to your project's scope and preferences HOW I WORK • Every project runs through the same structured process: business analysis and requirements, a scoped proposal with timeline and budget, design in Figma with QA built into every development phase, launch, and post-launch support. You get weekly updates, clear communication, and a partner who treats your product like their own. • For smaller projects, I work solo. For larger ones, I bring in my full-stack team — we've been collaborating for 5+ years, so you get the same reliability at any scale. We're an AI-first team of developers and designers who turn business ideas into production-ready SaaS platforms and B2B applications, on schedule and within budget. • Team: Senior full-stack developers · UI/UX designers · DevOps/AWS engineers · QA engineers · Business analyst & project manager • Our clients include HIPAA-compliant healthcare platforms, B2B e-commerce systems, enterprise web applications, and custom SaaS tools built for thousands of concurrent users. ★★★★★ Ready to discuss your project? Message me — the scoping call and intro estimate are free. Updated: September 22, 2026