Join COLIBRIX ONE - Innovating the Future of Payments
At COLIBRIX ONE*, We’re Building Advanced, AI-powered Payment Technologies That Support Payment Service Providers (PSPs), Electronic Money Institutions (EMIs), And Neobanks Across The EU And The UK. As a Fully Licensed EMI (FCA Reference Number 927920) And a Principal Member Of Mastercard, We Offer Real-world Financial Solutions That Include
- General card processing
- Digital wallet infrastructure
- Cross-border merchant accounts
- Alternative payment methods (APMs)
- Corporate accounts for legal entities

We’re a fast-growing team with a passion for innovation, security, and scalability. Our culture values curiosity, collaboration, and impact - and we’re looking for talented professionals who are ready to shape the future of fintech.

At COLIBRIX ONE, your work directly powers the digital economy. If you're eager to solve meaningful challenges and build with purpose, we’d love to hear from you.

About The Role
We write detailed technical specs.



Your job is to turn them into working product by orchestrating AI coding agents — and to own the quality of everything that ships. Our toolchain is Claude Code with custom skills on top of a structured spec pipeline; if you bring approaches that have worked for you, we are happy to compare and adopt what proves effective. You will work directly with the coordinators of this direction: the agentic development process is already up and running, and you will be its first dedicated engineer.

Responsibilities
- Take a spec and drive it to production: clarify ambiguities with the spec author instead of guessing, decompose work into small verifiable increments, execute via AI agents
- Design verification before generation: acceptance criteria, tests, invariants and API contracts that make agent output checkable
- Review and accept agent-generated code: catch silent scope creep, tests fitted to bugs, hallucinated APIs, code that passes but does the wrong thing
- Step in and cod

📌 AI-Native Fullstack Engineer (Barcelona)
🏢 Colibrix One
📍 Barcelona