Fullstack Engineer – Series B AI Startup | Spain (100% Remote)
I’m partnered with a fast-scaling AI startup, fresh off a Series B raise, looking for an early hire Developer to shape the next generation of their platform. You'll build the GenAI behind some of the products that you use every single day.
This is a role for hands-on builders who enjoy owning systems end-to-end, from backend architecture to clean, functional UI. You’ll work on production-scale APIs, and tooling that powers real-time generative AI applications.
You’ll work with
Ruby on Rails, React, TypeScript
RESTful APIs and PostgreSQL (Prisma)
Containerisation and orchestration (Docker, Kubernetes)
CI / CD (GitLab, GitHub Actions), AWS / GCP
Testing (RSpec, Jest, React Testing Library)
You bring
Solid fullstack experience in startup or product-led teams
Strong hands-on background with Ruby on Rails (v6+), React (v17+), JavaScript (incl. ES6+)
SQL Databases, ideally PostreSQL
Ability to design, build, and deploy production-ready features end-to-end
Proficiency in database design, API development, and performance optimisation
Solid GitHub or code samples that show technical depth and curiosity
Why join
Series B funding and strong traction with enterprise, media, and government clients
Work directly on real-time generative AI systems at production scale
Collaborate with senior engineers in a small, high-impact team with no bureaucracy
Own architecture decisions, ship fast, and see your work go live in weeks
100 % remote across Europe | Flexible hours | Equity included
If you want to build the infrastructure and interfaces that make AI talk, get in touch
Stack Engineer • Bilbao, Basque Country, Spain