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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Backend / Api Engineers (Mid To Staff Level) - Fintech Platform (Madrid / Hybrid) - **Company:** E-Frontiers - **Location:** Coslada, Spain (Remote available) - **Salary:** €40,000.0 - €90,000.0 - **Contract:** Permanent contract - **Skills:** Application Programming Interfaces (APIs), Amazon Web Services, Cloud Computing, Cloud Engineering, Continuous Integration, Software Design Patterns, Distributed Systems, Django Web Framework, Identity and Access Management, PostgreSQL, Object-Oriented Software Development, Redis, Cloud Platform System, Okta, System Availability, Backend, Build Management, Kubernetes, Low Latency, Restful APIs, Terraform, Api Management, Docker - **Published:** August 20, 2026 - **Apply:** https://www.buscojobs.com.es/backend-api-engineers-mid-to-staff-level-fintech-platform-madrid-hybrid-en-coslada-ID-368447795 ## About the Role Strong software engineering fundamentals (algorithms, design patterns, architecture) Experience building production-grade distributed systems Comfortable working in cloud-native environments Strong communication skills in English (international teams) Ownership mindset and ability to thrive in ambiguity Fintech experience is highly valuable Growth & impact First 3-6 months: contribute to building new platform components from scratch 12 months: ownership of a key platform area + influence across teams Clear performance framework and quarterly career development reviews ## Description We're hiring 4 Backend Engineers (Mid, Senior, and Staff levels) to join a high-impact API Platform team building scalable, self-serve infrastructure used by both customers and internal product teams.Lea el resumen de esta oportunidad para comprender qué habilidades, incluidas las habilidades interpersonales relevantes y el dominio de paquetes de software, se requieren.This is a rare opportunity to join a fast-growing fintech environment where the API is a top business priority and sits at the core of the company's platform modernisation strategy.LocationMadrid (Hybrid: 4 days in office / 1 day remote)Salary€40K - €90K + bonus + benefits (depending on experience level: Mid / Senior / Staff)About the teamYou'll join an API Platform team focused on:Building a modern, scalable API surface used by external clients and internal teamsCreating self-service capabilities, including instant API credential provisioningLaunching and expanding a new API sandbox environment for clientsImproving performance, observability, reliability, and developer experienceBuilding foundations for AI-driven workflows via API integrations (MCP / agentic interfaces)Supporting platform modernization and service decomposition at scaleThe API is evolving into a product in itself, with strong visibility across engineering and the business.Tech environmentYou don't need to know everything, but experience in similar ecosystems is key:Backend: Python, Django, REST APIsData: PostgreSQL, RedisInfrastructure: AWS, Docker, Kubernetes, TerraformIdentity / access: IAM concepts (Keycloak or similar is a plus)Strong engineering fundamentals: system design, OOP + functional design, clean architectureCI/CD, observability, monitoring, and production ownership mindsetWhat you'll doDepending on your level, you will:Design and build scalable backend services and APIsOwn services end-to-end (\"you build it, you run it\")Contribute to architecture decisions via RFC processImprove platform reliability, latency, and developer experienceMentor more junior engineers (Senior+ levels)Help shape a modern platform used at global scaleWhat we're looking forStrong software engineering fundamentals (algorithms, design patterns, architecture)Experience building production-grade distributed systemsComfortable working in cloud-native environmentsStrong communication skills in English (international teams)Ownership mindset and ability to thrive in ambiguityFintech experience is highly valuableGrowth & impactFirst 3-6 months: contribute to building new platform components from scratch12 months: ownership of a key platform area + influence across teamsClear performance framework and quarterly career development reviewsHigh visibility role in a strategic engineering initiativeAbout E-FrontiersWe are a specialist tech recruitment partner working with leading product companies and fintech organisations across Europe.We focus on connecting strong engineering talent with high-impact roles where they can grow and build meaningful products.xqysrnhIf you're interested or know someone who could be a fit, feel free to reach out directly or send your CV.Hay opciones de teletrabajo/trabajo desde casa disponibles para este puesto. ## Related Videos - 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