I build polished, scalable products across EdTech, Web3, FinTech, and automation-heavy platforms. My work usually sits at the intersection of product thinking, clean architecture, and fast execution — turning ambitious ideas into real systems people actually use.
Experience: 10 years
- 🧠 Senior full stack developer with strong product and architecture instincts.
- 🛠️ Building with TypeScript, React, Next.js, Svelte, SvelteKit, Node.js, PostgreSQL, Redis, Docker, and AWS.
- ⚡ Focused on performance, maintainability, developer experience, and real user impact.
- 🌍 Experienced in shipping products for global users, including bilingual experiences and real-time systems.
- 🔍 Especially interested in AI-powered features, automation, analytics, and complex UX made simple.
- ⭐ Insanely good at product strategy and founder support
Built a full learning platform from concept to production — including adaptive learning flows, collaborative features, analytics, and bilingual support.
Highlights:
- ✅ Assessment engine with multi-format exam questions
- 🤖 Automated grading and photo-based open responses
- 🛡️ Real-time anti-cheat monitoring
- 🎮 Gamification with ELO progression, XP, achievements, and milestone systems
- 📊 Teacher/admin dashboards with analytics
- 🔐 JWT auth, CSRF protection, and passwordless WebAuth login
Worked on a unified Web3 experience connecting multiple Radix-based dApps into one smoother product ecosystem.
Highlights:
- 💸 Liquidity management, staking, swapping, NFT trading, and domain administration
- 🚀 Reduced initial load times by 3 seconds
- 🧹 Removed around 11,000 lines of code through cleanup and refactoring
- 🔄 Helped migrate the platform from Svelte 4 to Svelte 5
Built blockchain-connected onboarding quests integrated directly with smart contracts, designed to make Web3 onboarding more engaging and transparent.
Highlights:
- 👥 Reached 100k+ users
- 🔁 Combined frontend experiences with microservices
- 📡 Supported real-time feedback and reward tracking
Led major frontend work after a product pivot and helped shape a much stronger wallet-alert experience.
Highlights:
- 🧭 Designed wallet and NFT discovery flows
- 🎛️ Built advanced live filtering and onboarding UX
- 🧱 Created reusable UI foundations and component systems
- 🤖 Developed a browser automation plugin for wallet tracking across web properties
Worked across platform engineering, product delivery, Web3, and donation systems.
Highlights:
- ⚙️ Built a Trello + AWS DevOps system that increased development speed by 7x
- 💳 Developed a PayPal donation system processing over $100k
- 🖼️ Built an NFT auction house with junior engineers
- 🔁 Maintained and expanded decentralized exchange features
const marcin = {
languages: ["JavaScript", "TypeScript", "Python", "Go", "Rust"],
frontend: ["React", "Next.js", "Svelte", "SvelteKit", "Tailwind CSS", "SCSS", "styled-components"],
backend: ["Node.js", "APIs", "GraphQL", "WebSockets", "Redis"],
databases: ["PostgreSQL", "MongoDB", "DynamoDB"],
tools: ["Docker", "AWS", "DigitalOcean", "Storybook", "Jest", "Playwright", "Puppeteer"]
}- Building products that solve real problems
- Creating smooth UX around technically complex systems
- Writing code that stays fast, clear, and scalable
- Balancing speed of delivery with long-term quality
- Improving both the product and the way teams build it
Right now, I'm especially interested in:
- Full stack product development
- Platform architecture
- Performance optimization
- Automation and internal tooling
- AI-enhanced user experiences
- Real-time and data-rich applications
Building products that are fast, useful, and satisfying to use.