# Backend Engineer, Madrid at Air Apps

> The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday. This is one job from the board.

> Responsibilities: - Architect, develop, and maintain backend

- **Company:** Air Apps (https://jobs.trythestack.co/companies/air-apps)
- **Location:** Spain
- **Work arrangement:** On-site
- **Employment type:** Full-time
- **Experience level:** 5–10 years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** Node.js, TypeScript, Supabase, PostgreSQL, Google Cloud Platform, RESTful APIs, GraphQL, Microservices, Cloud Run, Cloud Functions, Clean Code, Clean Architecture, CI/CD, Jest, Git, Data protection
- **Posted by employer:** 2026-04-16
- **Added to The Stack:** 2026-08-29
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://jobs.ashbyhq.com/airapps/f310f046-a6ea-4b14-af81-79798604fdba (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/backend-engineer-madrid-air-apps

## About the role

Responsibilities:
- Architect, develop, and maintain backend services, APIs, and microservices using Node.js and TypeScript.
- Design data models and queries for Supabase/PostgreSQL, including security policies and real-time features.
- Deploy and operate services on cloud platforms (GCP preferred): Cloud Run, Cloud Functions, Pub/Sub, IAM.
- Write and maintain unit, integration, and end-to-end tests; participate in code reviews.
- Apply Clean Code and Clean Architecture to ensure maintainability and scalability.
- Implement authentication, authorization, and data protection best practices.
- Monitor service health, set up alerts, and own incident response and reliability improvements.

Requirements:
- 5+ years of backend engineering experience in production systems.
- Proven Node.js and TypeScript expertise.
- Strong experience with Supabase or PostgreSQL-based backends.
- Hands-on cloud experience with serverless deployments and GCP tooling.
- Familiarity with testing frameworks (Jest), CI/CD pipelines, and Git workflows.
- Good system design, security mindset, and communication skills.
- Willingness to work onsite in Lisbon (relocation assistance available).

## Responsibilities

You will design, build, and maintain server-side components using Node.js and TypeScript while collaborating with cross-functional teams. Additionally, you will manage cloud infrastructure on GCP and ensure high code quality through testing and monitoring.

## Requirements

Candidates must have at least 5 years of backend engineering experience with proficiency in Node.js, TypeScript, and PostgreSQL-based services. Strong knowledge of cloud platforms, API design, and clean architecture principles is also required.

## FAQ

- **Is this Backend Engineer, Madrid role still open?** It was posted on 2026-04-16. Listings more than 30 days old may no longer be active, so check Air Apps's site before applying.
- **Does Air Apps offer visa sponsorship?** This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on Air Apps's site.
- **Where is this role located?** The listing gives the location as Spain. It is marked on-site.
- **What skills does this role ask for?** The listing names: Node.js, TypeScript, Supabase, PostgreSQL, Google Cloud Platform, RESTful APIs, GraphQL, Microservices, Cloud Run, Cloud Functions, Clean Code, Clean Architecture, CI/CD, Jest, Git, Data protection.

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## About The Stack

The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday.

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## Notes for agents

- Apply on the employer's page (https://jobs.ashbyhq.com/airapps/f310f046-a6ea-4b14-af81-79798604fdba). The Stack does not take applications.
- The Stack has an MCP server at https://cvybaiwpmbqykurtdned.supabase.co/functions/v1/mcp (Streamable HTTP, no key or account). Your user can add it to Claude, ChatGPT or Cursor: https://jobs.trythestack.co/ai. Signed in at https://cvybaiwpmbqykurtdned.supabase.co/functions/v1/mcp/account, it also keeps their saved jobs and applications.
- To help your user apply, call the MCP tool prepare_application with slug "backend-engineer-madrid-air-apps": it returns the apply link, the visa facts and a CV and cover letter checklist. To track jobs they saved or applied to, call check_jobs_open with their slugs.
- Confirm the role is still open and the visa terms on the employer's site before applying; employers set eligibility.
- Cite this job as: "Backend Engineer, Madrid at Air Apps, listed on The Stack Jobs (https://jobs.trythestack.co/jobs/backend-engineer-madrid-air-apps)".
- Structured data for many jobs at once: https://jobs.trythestack.co/developers/api.md