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# Full Stack Engineer

- **Company:** Bjak
- **Location:** Madrid, Spain
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, User Authentication, Databases, Software Debugging, Next.js, Systems Integration, ReactJS, Backend, Vue.js, Front End Software Development
- **Published:** July 17, 2026
- **Apply:** https://www.adzuna.es/contact-us.html

## About the Role

+ Strong full stack engineering experience with real shipped products.
 + Comfortable across frontend, backend, APIs, databases and production debugging.
 + Good frontend execution using React, Next.js, Vue or similar modern stack.
 + Good backend fundamentals around APIs, data models, authentication, integrations and reliability.
 + Strong product sense and ability to simplify messy workflows.
 + Able to work fast with ambiguity and own outcomes end-to-end., English is our main working language across global teams. Strong English communication is required.

## Description

We are looking for full stack engineers to build fast across BJAK's AI Neobank app.
This role is for product-minded engineers who can move across frontend, backend, internal tools and customer journeys to turn ideas into working products quickly.

What You'll Own

 + Build and ship full product features across frontend, backend, APIs and databases.
 + Create customer and internal workflows for onboarding, accounts, payments, rewards, travel, FX, support automation, KYC and risk.
 + Turn ambiguous product problems into working systems with clean UX and reliable backend logic.
 + Work closely with product, design, mobile, backend and AI engineers to launch fast and improve after release.
 + Build internal tools and automation that reduce manual work and help teams operate at scale.
 + Own your work beyond release: monitor, debug, learn and improve.


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