Full-time

Senior Back-End JS Engineer

Posted by Forsyth Barnes • Madrid, Community of Madrid, Spain

📍 Madrid, Community of Madrid 🕒 February 24, 2026

About the Role

Senior Backend Developer Contract Role:8-12 month contract

You'll join a large, distributed backend engineering community and work within cross-functional teams alongside product managers, frontend, and mobile engineers. You'll play a key role in shaping core financial products, supporting a rapidly growing user base, and delivering high-quality solutions in a fast-paced environment.

Design, develop, deploy, and maintain backend services aligned with team and business goalsBackend: Frontend: React.jsMobile: Kotlin, SwiftInfrastructure: Kubernetes on AWSDatabase: PostgreSQLKafka, ELK stack, and other modern tools

Cash flow management and bookkeeping toolsEach team typically includes 6–8 backend engineers and owns its product scope end to end.

Quality-oriented: Strong advocate for testing, clean code, and constructive code reviewsLanguage: Fluent in English

A remote or onsite technical exercise to showcase your skills and experience what it's like to...

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