Hi, I'm Kilian — a full-stack Web3 and AI developer based in Prague, Czech Republic with a proven track record of shipping products and winning hackathons. I've shipped 11+ projects across Web3, SaaS, desktop apps, and games — working with technologies like NextJS, TypeScript, Solidity, Rust, Tauri, and Svelte across multiple blockchains including Ronin, Polkadot, and Base. Hackathon Achievements (6 hackathons, 8 awards): - ETHGlobal Cannes — Best Consumer App on Ronin, 1st Place - Polkadot Web0 Berlin — Main Track Winner + Ink Alliance Bounty + UX Bounty (3 prizes) - ETHWarsaw — Best Mini App on Base, 1st Place - ETHGlobal Buenos Aires — Best Consumer/AI dApp on Ronin, 2nd Place - Sub0 Symbiosis — XX Network Bounty, 1st Place ($3,000) - Polkadot Cloud Hackathon — Community Roots Meetup Prize Notable Projects: - Ronkeverse — Built NFT casino games, landing pages, leaderboard systems, and backend infrastructure on Ronin - Allstake — Sole developer of a cross-chain Web3 platform with NFT marketplaces, staking, auctions, and raffles - Minefield Navigator — First developer hire for a SaaS platform helping e-commerce sellers expand into Europe - The Agency — An autonomous multi-agent AI system built on Claude Code My core stack: NextJS, TypeScript, Solidity, Tailwind CSS, and smart contract development. I also work with Rust, Tauri, Svelte, PhaserJS, and various blockchain ecosystems. I'm passionate about building innovative decentralized applications and bringing creative ideas to life. Let's connect and build something great together.

I am a dedicated and passionate software developer with strong expertise in JavaScript and Python. I thrive both as an independent developer and as a collaborative team member, adapting seamlessly to different work environments. I have a genuine enthusiasm for open-source development, actively enjoying the opportunity to contribute to and learn from open-source codebases. I am always looking to grow, take on new challenges, and deliver high-quality solutions that make a real impact.

Blockchain Protocol Engineer with 6+ years of hands-on experience designing, building, and securing end-to-end blockchain systems across public and private networks, with deep exposure to regulated environments. I specialize in: • Blockchain architecture & core protocol development (Public & Private Blockchains, Solana, Hyperledger, custom DLTs) • Smart Contracts & on-chain systems (DAO, Governance, Validator infrastructure) • Layer-2 scaling & interoperability (ZK-Rollups, Optimistic Rollups, bridges) • Custody, exchange, and real-world asset tokenization for regulated markets (ADGM / FSRA) • JavaScript, Solidity, Web3.js, Ether.js, Hardhat, Foundry, Rust, Go-lang I’ve delivered production-grade platforms including: • ADGM-compliant custody and exchange infrastructure • Real-world asset tokenization (real estate, gold, securities) • Liquidity engines, DeFi protocols, Web3 marketplaces, NFT platforms • Trading systems, HFT smart contracts, and blockchain-based gaming economies My work emphasizes security-first design, performance optimization, and regulatory alignment, bridging the gap between business requirements, compliance constraints, and deep technical execution. BS in Computer Science, Certified Blockchain Architect, and Smart Contract Security Expert. Passionate about turning complex blockchain problems into scalable, secure, real-world products and mentoring engineers to build systems that last.

Senior Rust & Blockchain Developer with 14+ years in software engineering. Transitioned from C++ systems programming to Rust, now specializing in Polkadot SDK — developed 10 custom FRAME pallets for production blockchain. Rust expertise: Axum, Tokio, SQLx, Tauri, Yew/WASM, Polars, teloxide. Full-stack capabilities from backend APIs to desktop apps. Blockchain: Polkadot SDK, Substrate, FRAME pallets, Solidity, Ink!, cross-chain integrations. Also proficient in: C++ (STL, Boost, Qt, OpenCV), TypeScript, Python. Strong background in testing (cargo nextest, tarpaulin, proptest) and CI/CD pipelines. Active in AI-assisted development — building Claude Code plugins and practicing spec-driven workflows.

Im a software developer experienced in web, mobile application development for SME. I have developed apps industries related to insurance, Cybersecurity and Blockchain.

Full-Stack & Agentic AI Systems Engineer Next.js | NestJS | Python | PostgreSQL | LLM Orchestration | Multi-Model AI Build fast, scalable, and intelligent systems — without tech debt. I help startups and product teams turn ideas into production-ready SaaS platforms, internal tools, and AI-native products powered by autonomous agents, structured LLM workflows, and multi-model orchestration (OpenAI, Claude, Gemini, Grok, Kimi, and custom agent frameworks like Clawbot-style systems). From system architecture to database design, multi-agent orchestration, AI integration, and deployment — everything is built for performance, clarity, adaptability, and long-term maintainability. WHAT YOU GET 🏗 Scalable, AI-ready architecture Clean system foundations designed for growth, agent workflows, tool execution, and zero rewrites. ⚡ High-performance frontend systems Fast, SEO-optimized Next.js applications (App Router, SSR, edge rendering). 🔐 Structured backend services Maintainable NestJS and Python backends designed for scale, AI orchestration, and modular expansion. 🤖 Advanced Agentic AI Integration Autonomous and semi-autonomous systems using: OpenAI (GPT-4/4o) Claude Gemini Grok Kimi AI Clawbot-style multi-agent systems Tool calling, structured outputs, memory layers, RAG, and workflow engines 🧠 Multi-Model Orchestration Vendor-agnostic LLM routing layers for performance, cost optimization, fallback logic, and intelligent model selection. 📦 Predictable delivery Clear technical decisions aligned with business, product, and revenue goals. 🤝 Strategic engineering partnership I think in systems — not just tickets. PROVEN RESULTS 🚀 Production-grade Next.js 13–15 applications with App Router & performance optimization 🧩 Scalable NestJS & Node.js service architectures 🤖 Agent-based AI features with structured outputs, tool execution & memory 🧠 Multi-agent orchestration systems (planner → executor → validator loops) 💳 Stripe subscription systems (metered billing, access logic, webhooks) 📊 Real-time financial & analytics dashboards 🗄 Optimized PostgreSQL schemas (Prisma & SQL-first modeling) 🔄 CI/CD optimization reducing infrastructure costs by ~20% 🌐 Web3 integrations (ERC-20, vesting contracts, wallet flows) WHAT I CAN BUILD FOR YOU 💼 SaaS platforms built for long-term scale 🧪 Lean but production-ready MVPs 🏢 Internal automation systems 📊 Data & analytics platforms 🤖 AI-native applications with autonomous agents 🧠 Multi-agent systems (planner / researcher / executor architectures) 🧬 Clawbot-style structured reasoning systems 🧩 Cross-model LLM infrastructures (OpenAI + Claude + Gemini + Grok + Kimi) 💳 Subscription & billing infrastructures 🎓 Education & gated-content platforms 🔗 Web3-connected applications 💡 Lovable-style rapid product builds with production-grade foundations TECHNOLOGY STACK Frontend ⚛ React ▲ Next.js (13–15) – App Router, SSR, Edge 🟦 TypeScript 🎨 Tailwind CSS 🧩 shadcn/ui 🖌 Material UI Backend 🟢 Node.js 🧱 NestJS 🐍 Python (AI pipelines, orchestration, automation services) 🌐 Express 🔌 REST APIs 🧩 Modular & microservice architectures Data 🐘 PostgreSQL 🍃 MongoDB 🔷 Prisma ⚡ Drizzle ORM AI & Orchestration 🤖 OpenAI, Claude, Gemini, Grok, Kimi AI 🧠 Agentic system design & orchestration layers 🧩 Clawbot-style reasoning frameworks 🔄 Tool calling & structured outputs 📊 Retrieval-Augmented Generation (RAG) systems 🧠 Memory layers (vector + structured memory) 🔌 External API & tool integrations 🧭 Model routing & fallback logic ⚡ Cost & latency-optimized LLM selection DevOps & Quality 🐳 Docker ⚙ GitHub Actions 🚀 Reliable staging & production pipelines 🗂 Monorepos ✅ E2E & integration testing WHAT YOU DON’T HAVE TO WORRY ABOUT 🧨 Fragile architectures 🐌 Slow, bloated applications 📉 Messy codebases 🔁 “Rewrite it later” decisions 🤖 AI features duct-taped onto legacy systems 🔌 Vendor lock-in to a single LLM provider Everything is designed as a cohesive system — frontend, backend, database, and AI working together as a scalable, adaptable infrastructure.

Most developers ship features. I ship products. I'm a full-stack engineer specialized in Web3 integrations and high-performance frontend — the intersection where EVM meets great UX. I work with founders and product teams who care about what they're building, not just who's cheapest. What I bring to the table: → NFT marketplace development (ERC-721/1155, minting, migrations, royalties) → Wallet authentication & Web3 integrations (wagmi, ethers.js, viem, WalletConnect) → Next.js & TypeScript at scale — clean architecture, fast load times, real DX → Smartcontract Development — transparent and secure for your business → Backend fluency in NestJS — I can own the full stack when the project calls for it I've shipped platforms that handle real users and real money. I understand that smart contract logic is only half the work — the wallet UX, error states, and gas feedback are where trust is built or lost. I also build product outside of client work. Cadetería Punto Centro is a logistics SaaS I designed and built from scratch: QR-based package tracking (à la MercadoLibre), AI-optimized routing, client-level P&L dashboards, and a full admin panel. It runs a real business in production. I'm selective about what I take on — not because I'm difficult, but because I only commit to work I can do exceptionally. If you're building something that matters and need an engineer who thinks like a product person: let's talk.

- 15+ AI-powered & SaaS applications shipped - AI systems live in production, used by thousands - $20M+ raised by my clients on products I’ve helped build - Recent roles ranging from Sr. Engineering to Leadership. 👋 About Me I’m a Senior Full-Stack AI Engineer with 10+ years of experience and a Master's in AI and Machine Learning. Building scalable software and in recent years, my focus has been on AI development, Generative AI, and AI agent systems that actually ship and scale. I help founders and product teams turn ideas into AI-powered SaaS platforms, intelligent web apps, and autonomous AI agents. From MVP to production, I design systems that are reliable, secure, and built for real users, not just demos. I’ve worked across AI-driven web platforms, backend systems, automation pipelines, and LLM-powered applications, contributing to products that have raised $20M+ in funding. My role often spans hands-on development, system architecture, and technical leadership. If you’re building something that needs LLMs, AI agents, or smart automation, I can help you design it right and get it live. 🛠️ What I Work With AI & Generative AI: AI Agents, LLMs, GPT-4, ChatGPT API, RAG, NLP, Vector Databases Frontend: React, Next.js, React Native, TypeScript Backend: Python (FastAPI, Django), Node.js Cloud & DevOps: AWS, GCP, Docker, Kubernetes APIs & Data: REST, GraphQL, PostgreSQL, MongoDB, Redis Open to both Full-stack and AI focused roles. Want to know more? Drop a message to get my resume.

Businesses don't just need developers, 𝐭𝐡𝐞𝐲 𝐧𝐞𝐞𝐝 𝐞𝐧𝐠𝐢𝐧𝐞𝐞𝐫𝐬 𝐰𝐡𝐨 𝐜𝐚𝐧 𝐛𝐮𝐢𝐥𝐝 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬 𝐭𝐡𝐚𝐭 𝐩𝐞𝐫𝐟𝐨𝐫𝐦, 𝐠𝐫𝐨𝐰, 𝐚𝐧𝐝 𝐠𝐞𝐧𝐞𝐫𝐚𝐭𝐞 𝐫𝐞𝐯𝐞𝐧𝐮𝐞. For 𝟏𝟎+ 𝐲𝐞𝐚𝐫𝐬, I've been helping startups, SaaS companies, and enterprises transform ideas into𝐬𝐞𝐜𝐮𝐫𝐞, 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞, 𝐡𝐢𝐠𝐡-𝐩𝐞𝐫𝐟𝐨𝐫𝐦𝐚𝐧𝐜𝐞 𝐰𝐞𝐛 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬. From MVPs to enterprise platforms, I build products that are optimized for speed, scalability, security, maintainability, and exceptional user experience. I've successfully delivered 60+ production-grade applications across SaaS, E-commerce, FinTech, Healthcare, Real Estate, Education, Logistics, and Enterprise solutions, helping businesses launch faster, improve customer engagement, and scale with confidence. 🚀 𝐖𝐡𝐚𝐭 𝐈 𝐁𝐮𝐢𝐥𝐝 ✔ SaaS Platforms ✔ Enterprise Web Applications ✔ MERN Stack Applications ✔ React.js & Next.js Applications ✔ Custom Business Portals ✔ Admin Dashboards ✔ CRM & ERP Systems ✔ Marketplace Platforms ✔ E-commerce Solutions ✔ B2B & B2C Applications ✔ REST APIs & GraphQL APIs ✔ AI-Integrated Applications ✔ Cloud-Based Platforms ✔ Real-Time Applications ✔ Multi-Tenant SaaS Solutions ⭐ 𝐁𝐮𝐬𝐢𝐧𝐞𝐬𝐬 𝐈𝐦𝐩𝐚𝐜𝐭 🏆 Built scalable SaaS platforms supporting 10,000+ concurrent users 🏆 Delivered 60+ successful web applications across multiple industries 🏆 Developed enterprise systems with 99.9% uptime 🏆 Built high-performance applications optimized for Core Web Vitals 🏆 Improved application performance through scalable architecture and optimized APIs 🏆 Designed cloud-native systems capable of handling rapid business growth 🏆 Built secure authentication and authorization systems for enterprise applications 🏆 Integrated payment gateways, third-party APIs, automation platforms, and cloud services 💻 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: I build modern, responsive, fast-loading user interfaces that provide outstanding user experiences. 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: • React.js • Next.js • JavaScript (ES6+) • TypeScript • Redux Toolkit • Zustand • Vue.js • HTML5 • CSS3 • Tailwind CSS • Material UI (MUI) • Ant Design • Bootstrap • Responsive Design • Mobile-First Development • Progressive Web Apps (PWA) • SEO Optimization • Core Web Vitals • Performance Optimization ⚙ 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 Building secure, scalable backend systems designed for production environments. 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 • Node.js • Express.js • NestJS • REST API Development • GraphQL • Microservices • Authentication & Authorization • JWT • OAuth • Role-Based Access Control (RBAC) • API Security • WebSockets • Cron Jobs • Background Workers • Queue Systems 🗄 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 & 𝐒𝐭𝐨𝐫𝐚𝐠𝐞 • MongoDB • PostgreSQL • MySQL • Redis • Firebase • Supabase • Prisma ORM • Database Optimization • Data Modeling • Query Optimization ☁ 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬 • AWS • Microsoft Azure • Google Cloud Platform • DigitalOcean • Docker • Kubernetes • CI/CD Pipelines • GitHub Actions • Vercel • Netlify • Nginx • Linux • Cloud Deployment • Performance Monitoring 🔌 𝐀𝐏𝐈 & 𝐓𝐡𝐢𝐫𝐝-𝐏𝐚𝐫𝐭𝐲 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬 • Twilio • SendGrid • Firebase • Auth0 • Google APIs • OpenAI API • AWS Services • Social Login • Payment Gateway Integration • CRM Integrations • ERP Integrations • Webhooks 🏗 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 ✔ End-to-End Product Development ✔ MVP Development ✔ SaaS Development ✔ Enterprise Software Development ✔ Custom Web Applications ✔ Dashboard Development ✔ API Development ✔ System Architecture ✔ Database Design ✔ Performance Optimization ✔ Application Modernization ✔ Cloud Migration ✔ Third-Party Integrations ✔ Maintenance & Long-Term Support 🌎 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 • SaaS • FinTech • Healthcare • Real Estate • E-commerce • Logistics • Education • Travel • Marketing • Manufacturing • HR Tech • Legal Tech • Enterprise Solutions 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞 ✔ 10+ Years of Professional Experience ✔ Production-Ready Code ✔ Clean & Maintainable Architecture ✔ Secure & Scalable Development ✔ Excellent Communication ✔ Fast Response Time ✔ Long-Term Project Support ✔ Agile Development Process ✔ Business-Focused Solutions ✔ High-Quality Deliverables ✔ Reliable Deadlines ✔ Transparent Collaboration 𝐋𝐞𝐭'𝐬 𝐁𝐮𝐢𝐥𝐝 𝐒𝐨𝐦𝐞𝐭𝐡𝐢𝐧𝐠 𝐄𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧𝐚𝐥: Whether you're launching a new SaaS platform, modernizing an enterprise application, building a scalable MERN product, or creating a custom web solution, I can help transform your ideas into reliable, high-performance software that is built to scale. I look forward to discussing your project and helping you build a product that delivers measurable business results. Core keywords: Full Stack Developer, React.js, Next.js, Node.js, MERN Stack, JavaScript, TypeScript, Express.js, MongoDB, PostgreSQL, REST API, GraphQL, AWS, Docker, SaaS, AI Integration

Hello there! 👋 I'm a seasoned senior backend developer with over 5+ years of expertise in crafting sophisticated business systems. In my capacity as a Senior Backend Development Engineer at ByteDance Inc., the powerhouse behind TikTok, I've harnessed the power of Golang, Java, Python, and C++ to engineer recommendation systems tailored to elevate the TikTok short video experience. What I bring to the table for you: 🚀 Free consultation: Delighted to provide insights based on hands-on experience with your project. 🛠 Project development: Proficient in Golang, Python, and Java, well-versed in their ecosystems and renowned frameworks. Services include API development, code refactoring, system design... 🔧 DevOps engineering: Well-acquainted with Kubernetes and Docker, with hands-on experience in open-source projects utilizing these for seamless deployments. Eager to collaborate and create brilliance together! 💻🌟