Senior Fullstack Developer
First seen by Alion on Oct 7, 2026.
About BlockyDevs
We build end-to-end applications combining fintech-grade reliability with Web3 innovation.
Your Role
As a Fullstack Developer, you’ll primarily work with Node.js on the backend, React on the frontend, and occasionally contribute to smart contract development.
Responsibilities
Develop backend services with *Node.js (NestJS/Express)**
Build frontend apps with *React/Next.js + TypeScript**
Work with databases (PostgreSQL, MongoDB) and APIs
Occasionally contribute to smart contracts (EVM/SVM)
Collaborate with design, backend, and blockchain teams
Requirements
Strong backend skills in Node.js/NestJS
At least 5 years of experience in backend applications
At least 2 years of experience in maintaining production applications
Solid frontend skills in React + TypeScript
Database and API integration knowledge
Experience mentoring mid/junior developers
English at least B2 level
Ability to work 100% onsite from our office near Metro Plac Wilsona, Warsaw
Nice-to-have
Microservices and cloud deployment experience
Web3 integrations knowledge
Rates (B2B/Freelance)
Senior: 120 - 180 PLN/h
Recruitment Process
1. Intro Call (30 min) – Quick chat about your experience, expectations, and our projects.
2. Technical Interview / Task – Backend (Node.js) and frontend (React) focus, with some discussion of smart contracts.
3. Final Meeting – Culture/fit + project discussion.
4. Offer – Fast decision if it’s a match.
5. Process usually takes 2–3 weeks.
6. Feedback after each stage within a few days
Tech stack
- Nest.js
- TypeScript
- Node.js
- Web3
- React