qwerty

Frontend Heavy Fullstack Engineer (React/Next, Type Script, Node.Js) | Web3 Integrations

β€œEvery line of code that is written with passion is a reflection of the coder, not just the program.”

Senior frontend-heavy fullstack engineer focused on React/Next.js, TypeScript, Node.js, production UI architecture, code maintainability and Web3 integrations. I help teams evolve complex codebases safely through refactoring, TypeScript migrations, technical debt reduction, dev tooling, documentation, and pragmatic technical decisions. I am an early adopter of React (having worked with it since its beta version 0.12) and since 2015 I have delivered products across SaaS, e-commerce, fintech, Web3, real-time dashboards, telecommunications, and internal tooling, mostly in remote/distributed teams. I am strongest in hands-on senior roles where I can own scoped technical decisions, improve quality, mentor through code review and topic-driven learning sessions, and turn ambiguous product requirements into maintainable implementation.



Experience: 11 years

Yearly salary: $120,000

Hourly rate: $60

Nationality: πŸ‡¨πŸ‡Ώ Czech Republic

Residency: πŸ‡¨πŸ‡Ώ Czech Republic


Experience

Fullstack Web3 / React / Node Developer
CXIP Labs / Holograph.xyz
2022 - 2024
Natively multi-chain bridging and minting platform for NFT creators and collectors. Core: React, Next.js, TypeScript, JavaScript, Node.js, NestJS, GraphQL, PostgreSQL, Redis, Solidity, ethers.js, web3.js, wagmi, viem, Tailwind CSS, Docusaurus, Markdown/MDX, Vercel ● Joined as one of the initial fullstack engineers and helped establish frontend architecture, delivery structure, and CI/CD foundations. ● Assumed ownership of the Frontend and Documentation domains after team growth and migration to a monorepo setup. ● Developed responsive web applications for NFT dashboard, mint, and bridge products across multiple redesigns, themes, and mobile layouts. ● Implemented Web3 integrations and later helped migrate integration patterns from web3-react toward wagmi/viem for better maintainability and developer experience. ● Reduced technical debt through refactoring, TypeScript integration, code review, and clearer component/API boundaries. ● Contributed a custom Solidity faucet contract and occasionally maintained NestJS GraphQL API areas. ● Maintained and refactored Docusaurus documentation using Markdown MDX, improving structure and long-term maintainability. ● Mentored peers through code reviews and knowledge-sharing sessions focused on technical issues, better patterns, codebase quality, and introducing emerging technologies. ● Explored product-facing R&D such as Farcaster Frames using Redis/Vercel KV.
Fullstack Web3 / Node.js / Solidity Developer
NFT Project
2021 - 2022
Core technologies: Solidity, Remix, Polygon, MetaMask, Next.js, React, TypeScript, Node.js, IPFS, ERC-721 ● Delivered an ERC-721 NFT Solidity contract with custom logic, a payable contract, and mint-page integration. ● Built end-to-end Web3 mint flows with smart checks, wallet interaction, transaction support, and metadata API support. ● Other tasks included: Metadata analysis for the NFT, consultation, OpenSea setup, tx support, Gnosis MultiSig wallet
Backend-heavy Fullstack React/Node Develope
Curys / Dixons Carphone
2019 - 2021
Core: React, Next.js, TypeScript, JavaScript, styled-components, Node.js, Express/NestJS, PostgreSQL, microfrontends, microservices ● Worked closely with UK-based Product Owners as a primary technical contact for product and delivery decisions. ● Led the design and implementation of a data-driven trade-up/upselling feature that compared similar products using weighted criteria and price-performance ranking. ● Implemented backend scoring logic and frontend integration, improving how users discovered better or cheaper alternatives aligned with purchase intent resulting in increased conversion rates. ● Delivered microservices and backend-for-frontend APIs within a microfrontend/microservice architecture. ● Contributed to Currys e-commerce frontend features, internal backoffice systems, CMS tooling, and a custom WYSIWYG block editor using custom JSX Pragma (preprocessor).
Independent contractor
Qwerty.xyz s.r.o.
2018 - 2026
Senior Fullstack engineer delivering short-to-mid-term B2B engagements for international clients, typically in remote product teams. Specialized in MVPs, PoCs, deadline recovery, technical acceleration, and focused delivery. Typical work includes React/TypeScript architecture, Web3 integrations, Node.js APIs, refactoring, technical debt reduction, delivery tooling, documentation, and mentoring through code reviews and topic-driven learning sessions. ● Web3 integrations (web3.js, ethers.js, wagmi, rainbowkit) ● Refactoring and TypeScript migrations ● React.js optimizations ● Documentation (JSDoc, Markdown, Docusaurus) ● Project setup & configuration (webpack, tsconfig, eslint, prettier, …) Clients: Slingshot.finance (DeFI), Knauf Gips, Notino, Continero Corp, Stekkie (Reverse mortgage), HB Reavis, IGLUU / Stratus Data Systems (Real estate), Oxbridge Admissions (Oxford, Cambridge), U+ / User Technologies, Adidas, Infosys, STUDENT AGENCY, Ε KODA,... Core technologies: JavaScript / TypeScript, React.js, Node.js, Web3, Solidity
Fullstack JavaScript Developer
IPEX a.s.
2015 - 2018
Core: JavaScript ES6, React, Node.js, Express, Immutable.js, Electron, WebRTC, SIP, RTP, WebSockets, Firebase, MySQL ● Built a browser/Electron communication and management platform combining messaging, WebRTC audio/video, SIP telephony, PBX integration, and real-time dashboards. ● Architected end-to-end browser-to-PBX call flows, including SIP signaling, ICE negotiation, fallback handling, recovery paths, and physical phone/browser routing. ● Implemented call-center dashboards, backoffice management tools, service configuration modules, and B2B customer dashboards. ● Mentored a junior QA colleague transitioning into development.
Web developer
Freelance contractor
2011 - 2014
JavaScript, jQuery, HTML, CSS, PHP, WordPress, C++, Java, ...

Skills

blockchain
erc-1155
erc-20
erc-721
ethereum
firebase
graphql
javascript
nestjs
nextjs
node
react
solidity
tailwind
typescript
web3
full-stack
english
czech