> Markdown version of [/jobs/ext/1682274-backend-developer](https://www.wearedevelopers.com/jobs/ext/1682274-backend-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Backend Developer

- **Company:** Comunidad de Madrid
- **Location:** Madrid, Spain
- **Salary:** €50,000.0 - €75,000.0
- **Contract:** Permanent contract
- **Skills:** JavaScript (Programming Language), Application Programming Interfaces (APIs), Code Review, MongoDB, MySQL, Node.Js, Redis, Backend, Core Data, Kubernetes, Apache Kafka, Grpc, Docker, Microservices
- **Published:** July 11, 2026
- **Apply:** https://www.jobleads.com/es/job/eb892558186b3ecee830bb2cd28ce6de6

## About the Role

* 5+ years of hands-on Node.js backend development
 * Experience designing and architecting production-grade systems, not just implementing assigned tasks
 * Strong SQL fundamentals; MongoDB or Redis experience is a plus
 * Comfortable owning deployments, monitoring, and incident response alongside development work
 * Solid PR-based workflow and code review experience
 * Able to hit the ground running on a complex codebase with minimal onboarding support
 * Comfortable in a distributed team setup (most of the current team is based in Germany)

Familiarity with gRPC, Kafka, Docker, Kubernetes, or financial data platforms is a genuine advantage., Candidates must be based in Madrid or willing to relocate, and must be eligible to work in Spain indefinitely without sponsorship. Please submit your CV in English.

## Description

We're hiring on behalf of a established European fintech opening a new Madrid engineering hub, as part of a broader expansion across the continent. This is a hands-on senior role with real ownership, not a ticket-execution position. You'll join a small, pragmatic backend team building and maintaining the core data infrastructure that enterprise financial clients depend on daily., * A Core Data API with 40+ endpoints serving live financial data to enterprise clients, currently in its final development phase

 * Approximately 30 microservices, including ongoing ownership of stability and performance
 * An active migration from MySQL to MongoDB and Redis
 * A stack that includes plain JavaScript, gRPC, Kafka, and an on-premise Kubernetes cluster across dev, UAT, and production environments


## Related Videos

- [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape)
- [Boosting OpenSearch Performance: gRPC Search in Action](https://www.wearedevelopers.com/videos/1935-boosting-opensearch-performance-grpc-search-in-action)
- [Reducing LLM Calls with Vector Search Patterns - Raphael De Lio (Redis)](https://www.wearedevelopers.com/videos/1714-reducing-llm-calls-with-vector-search-patterns-raphael-de-lio-redis)
- [MySQL Protocol Features You Should Be Aware Of](https://www.wearedevelopers.com/videos/100267-mysql-protocol-features-you-should-be-aware-of)
- [Local Candidates vs International Talent - Building the Very Best Dev Team](https://www.wearedevelopers.com/videos/1067-local-candidates-vs-international-talent-building-the-very-best-dev-team)
- [gRPC Load Balancing Deep Dive](https://www.wearedevelopers.com/videos/1576-grpc-load-balancing-deep-dive)

## Related Articles

- [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers)
- [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs)
- [Where To Find Software Engineering Jobs](https://www.wearedevelopers.com/magazine/396-where-to-find-software-engineering-jobs)
- [Spanish Business Culture and Etiquette](https://www.wearedevelopers.com/magazine/353-spanish-business-culture-and-etiquette)
- [7 Most Popular Web Developer Jobs in Europe](https://www.wearedevelopers.com/magazine/163-7-most-popular-web-developer-jobs-in-europe)
- [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline)