Hire the Best Software Architecture Freelancers
in Poland

I engineer AI-driven business automation, custom SaaS platforms, and enterprise-grade Shopify solutions designed to eliminate manual workflows and slash operational overhead. Over the past 8+ years, I have built 100+ custom Shopify stores, themes, and apps. My focus is bridging the gap between artificial intelligence, custom software architecture, and e-commerce, transforming traditional business operations into autonomous, high-growth engines. I replace complexity and repetitive manual labor with intelligent, scalable infrastructure. Clients usually hire me for three things: AI Automation & Business Optimization Designing and integrating custom AI systems to handle data processing, asset generation, and operational tasks Replacing manual bottlenecks with intelligent workflows and custom AI agents tailored to specific business logic Embedding smart automation into backend management to completely remove human friction from day-to-day operations SaaS & Custom App Development Developing robust standalone SaaS products and custom applications from scratch Building public and private Shopify apps with custom business logic and deep API integrations Architecting external infrastructure that syncs seamlessly with core platforms via high-performance web architectures Advanced Shopify Plus Engineering Developing high-performance custom themes and storefronts built from scratch for maximum speed Engineering complex cart, checkout, and custom subscription contract flows using the GraphQL Admin API Replacing bloated third-party app dependencies with clean, native infrastructure and scalable architecture I approach every project as a product architect. Whether you need to launch a new SaaS platform, embed intelligent AI automation into your workflows, or engineer a high-converting enterprise store, I build systems that scale. If you are looking to eliminate manual bottlenecks, optimize your operations, and build autonomous technical infrastructure, let us build something that performs.

CTO and Data/AI Architect with 15+ years building production systems, from early-stage products to Fortune 500 enterprise platforms across the UK, US, and EU. I focus on resilient architecture, clear technical strategy, and AI systems that deliver measurable outcomes in B2B data-rich environments. I've designed and shipped data platforms, agentic RAG systems, multi-agent workflows, AI copilots, and orchestration layers integrating knowledge graphs, semantic layers, and multiple data sources. Domains: SaaS, BI, process intelligence, analytics, fraud detection, supply chain, distributed systems. ① AI & Data RAG end-to-end: chunking, retrieval, reranking, evaluation, monitoring Knowledge graphs: schema design, entity resolution, hybrid KG+RAG retrieval (Neo4j) Multi-agent systems: ReAct, MoE, MoA, hierarchical workflows, tool-using agents Orchestration: MCP, A2A, agent routers, tool registries Observability: latency/cost budgets, guardrails, failure modes, rollout strategy ② Technology Python, SQL, Ruby | Microservices, event-driven, APIs ClickHouse, BigQuery, Redshift, PostgreSQL, Apache Iceberg, Kafka, dbt LangGraph, LangChain, LangSmith, CrewAI, AutoGen, GCP ADK Neo4j, Pinecone, pgvector, Qdrant, FAISS, OpenSearch Docker, Kubernetes, Terraform, Helm, CI/CD Grafana, Prometheus, Looker | AWS, GCP ③ What I Lead CTO-level leadership: strategy, roadmap, delivery governance Data platform architecture: pipelines, modelling, KPIs, governance, cost control AI productisation: prototype to production with evaluation, monitoring, and guardrails Team building: hiring, mentoring, accountability for predictable delivery If you need a CTO-level partner who can architect, build, and lead from strategy to execution, with depth in both AI/Data and engineering reality, I'm the right fit.

I have more than 15 years of programming experience. As a freelancer, I have broad experience: I developed web (ASP.NET, Python, PHP), desktop (C++, C#, Python — Linux and Windows) and mobile (Android — Java, C++) applications. I list here some of my jobs. C#: * clubspeed.com — a large software suite for family entertainment clubs; included C# code (80%), including CoreApi and ASP.NET Razor, plus PHP (Laravel) and Node.js code (for low-level car racing control tasks). I developed it as a team member. * qadra.com — a financial company; C# code (80%), Python (some microservices are Python/Flask based, 20% of code), AWS-hosted with Docker containers and Lambdas. I developed it as a team member. * enven.nl — implemented from scratch their non-public partners portal: ASP.NET Razor and some CoreApi endpoints. * ASP.NET website for house rentals. * ASP.NET website for remote control of a robotic device via a WebSocket connection. * Vegetable-oil plant automation desktop program (C# + WinCC). Python: * Embeddable fact-checking chat that uses the LangGraph framework to implement a customizable LLM/AI backend (OpenAI, DeepSeek, Hugging Face, or Ollama). It allows administrators to embed the component in their websites so users can ask questions about facts described in articles and verify whether facts listed in an article are true. It included agentic code and many external APIs to check facts (not just asking an LLM), and even computer vision to inspect website photos (OpenCV). Backend is FastAPI. * AI/LLM-based ad selection for a website (FastAPI and LangGraph). It processes website text or chat messages and selects ads of different types related to the content. It contains SDKs for embedding ads on many platforms, including Go, React, and plain HTML. * Polish-language training software, based on Django and LangGraph. * Many small projects: desktop scripts, web scraping (Selenium and related tools), and simple AI agents. C++: * Factory equipment monitoring system (Ubuntu Linux, custom server over TCP/IP, web interface in PHP). * Many small projects, some of which are mentioned in reviews on this profile; many are non-public. * Powerful software for automated ad submission on social networks (massive bots that send millions of messages). PHP: * 20+ websites — without CMS, with my own CMS, and with open-source Drupal, WordPress and Joomla CMSs. * Backends for Android applications. Android: * SOCKS5 proxy application that allows sharing mobile VPN with non-mobile clients via the SOCKS protocol. * Many WebView-based "business card" applications. * Dating-related applications, including erotic puzzles. Human emulation: * Spam bots — I cannot provide a specific list of such software for legal reasons. * Automatic checkout on eBay and similar websites. * PayPal automatic payments. * Data scraping, including air tickets and goods in online stores. Reverse engineering — I cannot provide a specific list of reverse-engineered software for legal reasons. * Java bytecode reverse engineering, including Android. * .NET bytecode reverse engineering. * Machine code for 32-bit and 64-bit x86 and ARM CPUs. Assembler: * High-performance cryptographic library for x86\_64 CPUs.

10+ years of software engineering experience. Former UpWork employee (was laid off with 21% of the workforce). My goal is to help you achieve more spending less time and money. Working on Ptah.sh - Docker Swarm-based Heroku and Vercel alternative. I have rich experience working with different technologies: from PHP & Python, through JavaScript and Go, to mobile development with React Native and Flutter. Started multiple projects on my own: - e-sportstats.com - where I was a CTO and led a small team of 5 engineers - ptah.sh - Docker Swarm-based Heroku alternative where I am the sole founder and engineer Among that, I lead various conferences and made a couple courses for internal use for the companies I've been working with.

🚀 Top 1% of Talent in 𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 & Technology Leadership ⚡ Building 𝐀𝐈-𝐩𝐨𝐰𝐞𝐫𝐞𝐝 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬, enterprise platforms, SaaS solutions, and scalable digital ecosystems 🔧 Using modern AI tools including Cursor, Claude Code, GitHub Copilot, GPT-4/GPT-4o, and Claude Sonnet/Opus 🤖 Experienced in AI agents, LLM integrations, AI automation, and multi-agent development systems 🚀 Accelerating development with 𝐀𝐈-𝐚𝐬𝐬𝐢𝐬𝐭𝐞𝐝 𝐞𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐢, agentic coding, and automation-driven workflows 💻 𝐖𝐇𝐀𝐓 𝐘𝐎𝐔 𝐀𝐍𝐃 𝐘𝐎𝐔𝐑 𝐓𝐄𝐀𝐌 𝐆𝐄𝐓 Full-Stack Web Development Master's - high-performance web application development utilizing React, Node.js, and PHP to build scalable SaaS, FinTech, and Enterprise software. AI & Automation Systems Innovators - custom LLM applications, RAG pipelines, and intelligent workflow automations seamlessly integrated into your infrastructure. 📊 𝐀𝐂𝐇𝐈𝐄𝐕𝐄𝐌𝐄𝐍𝐓𝐒 𝐈𝐍 𝐍𝐔𝐌𝐁𝐄𝐑𝐒 (𝐁𝐔𝐒𝐈𝐍𝐄𝐒𝐒 & 𝐒𝐘𝐒𝐓𝐄𝐌 𝐈𝐌𝐏𝐀𝐂𝐓) 25+ years, 50,000+ engineering hours, 200+ successful launches delivered as a Senior Full Stack Developer and tech leader across global industries. ◾ Full-Stack Web Development for Enterprise & SaaS Platforms: Engineered and launched custom AI-powered SaaS platforms that scaled to millions of active users with 99.99% operational uptime. Accelerated product development cycles by 40% by deploying optimized React component libraries and agile workflows. Backend Architecture & API Engineering (Node.js & PHP): Reduced server infrastructure costs by 50% by migrating legacy monoliths into scalable microservices using Node.js, NestJS, and PHP. Optimized heavy data-processing pipelines, reducing database latency by 70% via tailored PostgreSQL, MongoDB, and MySQL schemas. ◾ AI App Development & Workflow Automation: Developed and integrated proprietary OpenAI GPT, Claude, and Gemini models into operational CRMs, increasing client workflow efficiency by 180%. Successfully deployed secure, HIPAA-compliant healthcare applications and high-security FinTech platforms with built-in Stripe / PayPal integrations. 🎯 𝐖𝐇𝐄𝐑𝐄 𝐖𝐄 𝐃𝐄𝐋𝐈𝐕𝐄𝐑 (𝐂𝐎𝐑𝐄 𝐄𝐗𝐏𝐄𝐑𝐓𝐈𝐒𝐄) As a Full Stack Developer & Solution Architect: I handle the full cycle of Full-Stack Web Development, defining technical roadmaps, designing scalable web applications, and ensuring bulletproof cyber-security protocols. As a Front-End Development Expert: Crafting pixel-perfect, highly responsive user interfaces using React, Next.js, TypeScript, Vue.js, and Angular to ensure maximum conversion rates and premium UX. As a Back-End Development Authority: Designing ultra-fast APIs and core services with Node.js (Express/NestJS), PHP, Python (FastAPI/Django), and modern Serverless Stack architectures. As a Cloud & DevOps Engineer: Implementing enterprise-grade cloud deployments via AWS, Google Cloud, and Azure, utilizing Docker, Kubernetes, and automated CI/CD pipelines. 🛠 𝐓𝐄𝐂𝐇 𝐒𝐓𝐀𝐂𝐊 & 𝐀𝐑𝐂𝐇𝐈𝐓𝐄𝐂𝐓𝐔𝐑𝐄 𝐄𝐂𝐎𝐒𝐘𝐒𝐓𝐄𝐌 Frontend Suite: React, Next.js, TypeScript, Tailwind CSS, Vue.js, Angular, Responsive Web Design. Backend Core: Node.js, NestJS, Express.js, PHP, Python, FastAPI, Django. Databases & Caching: PostgreSQL, MongoDB, MySQL, Redis. APIs & Global Integrations: REST APIs, GraphQL, Webhooks, Stripe, PayPal, Twilio, SendGrid. Cloud & DevOps Platform: AWS (Amazon Web Services), Google Cloud, Azure, Docker, Kubernetes, Jenkins, GitHub Actions CI/CD. 🧠 𝐃𝐄𝐄𝐏 𝐈𝐍𝐃𝐔𝐒𝐓𝐑𝐘 𝐄𝐗𝐏𝐄𝐑𝐈𝐄𝐍𝐂𝐄 AI & SaaS Startups: Rapid MVP development, RAG pipelines, AI chatbots, and predictive analytics tools. FinTech & E-commerce: High-load payment gateways, customized checkout solutions, compliance, and ledger systems. Healthcare & PropTech: Automated workflow systems, secure patient portals, CRM platforms, and real-time data visualization dashboards. Enterprise Automation: Heavy B2B platforms, marketplaces, and cross-platform integrations. ⚡ 𝐇𝐎𝐖 𝐖𝐄 𝐖𝐎𝐑𝐊 𝐓𝐎𝐆𝐄𝐓𝐇𝐄𝐑 Strategic Discovery: As a CTO, I align your business goals, success metrics, and timeline constraints before writing a single line of code. Architecture Blueprinting: We map out the core database schemas, React frontend components, and Node.js / PHP API flows to ensure long-term scalability. Agile Iteration: Backed by the senior engineering powerhouse at Onix-Systems, we deliver high-velocity sprints with predictable, production-ready releases every 2 weeks. DevOps & Launch: Secure deployment across AWS/GCP/Azure with ongoing tech partnership and proactive optimization based on product metrics. Looking for a Senior Full Stack Developer and a Full-Stack Web Development team to turn your complex concept into a world-class, scalable web platform? 𝐋𝐞𝐭’𝐬 𝐜𝐨𝐧𝐧𝐞𝐜𝐭! Send over your project brief, scope, or existing codebase notes, and I’ll provide a high-level strategic roadmap for your next big launch. ☎️

🥇 TOP RATED PLUS 🙌 100% JOB SUCCESS 🧐 15+ years of varied experience in architecture and development of JavaScript/Node.js/PHP web applications, scrappers and services for different companies and startups. I love to skillfully combine various technologies to solve non-standard problems of any architectural and logical complexity. I masterfully use cluster technologies, which allows me to create high-quality, high-speed, high-availability, fault-tolerant products that don't require constant maintenance. I can easily bypass any protection to obtain data from any sources. I'm interested in long-term relationships. ✓ Technologies:  Web Architecture | Distributed Systems | High Availability Clustering  Web Scraping | Content Distribution Networks (CDN)  Microservices | Virtual Machines (VM) | Live Video Streaming  Virtual Private Networks (VPN) | Containerization ✓ Programming languages & platforms:  JavaScript/TypeScript | Node.js | PHP ✓ Databases:  PostgreSQL | MySQL | MariaDB | Patroni  Redis | Redis Sentinel | Redis Cluster | MongoDB  Knex ORM | Prizma ORM | Drizzle ORM | Eloquent ORM | Mongoose  SQL | NoSQL ✓ Back-end technologies:  Node.js | Express.js  Laravel | Eloquent | Sanctum  Fetch | Ofetch | Axios  WebSockets | Socket.io | WebRTC  Ajax | JSON REST API | GraphQL | OAuth | JWT  Blockchain | Solidity | Web3.js  Stripe | Google Maps API  Data Mapping & Combination  Load Balancing  Telegram Bot Development ✓ Front-end technologies:  Vue 2 | Vue 3 | Pinia | VueX | Nuxt 2 | Nuxt 3 | Composition API | Options API  PrimeVue | Quasar | Vuetify | Tailwind CSS  Fetch | Ofetch | Axios  WebSockets | Socket.io | WebRTC  Server Side Rendering (SSR)  D3.js  Chrome Extensions  HTML | CSS | SASS/SCSS | LESS | PostCSS ✓ Automation/Crawling/Scrapping/Scanners:  Puppeteer  Chrome Extensions | Manifest V2 | Manifest V3  Perimeter X bypass  CloudFlare bypass  JS Injections  Decryption | Decoding  HTTP Proxy/VPN using ✓ Bookmaker Odds, Widgets & Livestreams (zero latency scanners):  Bet365 | Pinnacle | BetMGM | Betradar | Virginbet | Fonbet | Olimp ✓ Desktop technologies:  Electron.js ✓ Tools & Common:  Docker | Docker Compose | Kubernetes | Grafana | OpenSearch | Ansible  Git | GitHub | BitBucket | GitLab  CI/CD  NPM  Apache | Nginx  Gzip | Brotli  Java | C# | C++  Linux Administration (CentOS/Debian/Ubuntu) ✓ Cloud Providers:  Amazon Web Service (Lambda, EC2, S3, API gateway, Cognito, DynamoDB, etc.)  Microsoft Azure  Google Cloud Platform  Firebase (Cloud FireStore, Realtime Database, Cloud Functions)  Digital Ocean  Hetzner Cloud ✓ Areas of interest:  iGaming | Betting | Sportbooks | Onling Gambling | eSports  Artificial Intelligence | Deep Learning | Machine Learning  Cryptocurrency Trading If you have any questions or want to discuss your project, feel free to contact me. I'm always happy to make time for you. Thanks.