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# Experienced Fullstack Engineer - Store Apps Platform

- **Company:** Mediamarktsaturn Plattform Services Gmbh
- **Location:** Madrid, Spain
- **Contract:** Permanent contract
- **Skills:** Architectural Patterns, Mobile Application Development, Cloud Computing, System Configuration, Continuous Integration, Database Queries, Github, MongoDB, Node.Js, Query Optimization, TypeScript, ReactJS, Grafana, Database Optimization, Backend, Event Driven Architecture, Code Testing, Graphql, Front End Software Development, Api Design, Terraform
- **Published:** September 19, 2026
- **Apply:** https://www.buscojobs.com.es/experienced-fullstack-engineer-store-apps-platform-m-f-d-en-madrid-ID-370480582

## About the Role

Your Profile Solid fullstack experience with TypeScript and Node.js.
You've shipped and maintained production services and are comfortable owning them end-to-end.
Frontend capability in React.
You can build and maintain interfaces without needing a dedicated frontend team to carry you.
ReactNative experience is a plus.
Strong grasp of GraphQL for API design and data querying; experience with Apollo is a plus.
Hands-on experience with MongoDB: schema design, indexing strategies, and query optimisation at scale.
Comfortable with GCP services and Terraform for infrastructure-as-code; you understand how cloud environments are structured and managed.
Experience with CI/CD tooling, particularly GitHub Actions: you can build and maintain pipelines that teams actually trust.
Familiarity with event-driven architectures using Google Pub/Sub or similar systems; you understand the trade-offs between synchronous and asynchronous patterns.
Experience with Grafana (or equivalent): you think about observability as part of building, not as an afterthought.
A solid testing discipline covering unit, integration, and end-to-end scenarios; you think about failure modes and edge cases from the start.
Strong communication skills and a collaborative mindset: you can work across team boundaries, synthesise input from multiple stakeholders, and make pragmatic decisions.

## Description

Your Tasks We're looking for an experienced Fullstack Engineer to join our Platform team; a small, high-impact team that boosts the effectiveness of three teams building our store experiences.You'll be embedded in the centre of how we build and run software: owning shared infrastructure, shaping our backend orchestration service, and helping different teams move faster without sacrificing quality or reliability.Your Tasks Serve as a platform proxy for product teams: understanding their needs, unblocking them on shared concerns, and coordinating cross-team technical decisions.Contribute to our backend orchestration service used across all products: reviewing contributions, improving its design, and ensuring it remains reliable and well-documented as usage scales.Build and maintain shared projects such as the back office, taking ownership of both frontend and backend layers.Manage and improve our cloud infrastructure on GCP: provisioning, configuring, and maintaining environments used across product teams.Improve and extend our CI/CD pipelines (GitHub Actions), ensuring fast, stable, and repeatable delivery across all teams.Strengthen our observability: setting up and refining monitoring, alerting, and dashboards with Grafana to give teams clear visibility into production health.Write clean, well-tested code and contribute to a culture where quality and reliability are default.Support and mentor engineers across product teams, sharing knowledge on platform practices, infrastructure, and architectural patterns.Your Profile Solid fullstack experience with TypeScript and Node.js.You've shipped and maintained production services and are comfortable owning them end-to-end.Frontend capability in React.You can build and maintain interfaces without needing a dedicated frontend team to carry you.ReactNative experience is a plus.Strong grasp of GraphQL for API design and data querying; experience with Apollo is a plus.Hands-on experience with MongoDB: schema design, indexing strategies, and query optimisation at scale.Comfortable with GCP services and Terraform for infrastructure-as-code; you understand how cloud environments are structured and managed.Experience with CI/CD tooling, particularly GitHub Actions: you can build and maintain pipelines that teams actually trust.Familiarity with event-driven architectures using Google Pub/Sub or similar systems; you understand the trade-offs between synchronous and asynchronous patterns.Experience with Grafana (or equivalent): you think about observability as part of building, not as an afterthought.A solid testing discipline covering unit, integration, and end-to-end scenarios; you think about failure modes and edge cases from the start.Strong communication skills and a collaborative mindset: you can work across team boundaries, synthesise input from multiple stakeholders, and make pragmatic decisions.About Us MediaMarktSaturn is Europe's leading consumer electronics retailer.It sees itself as a partner, daily companion and navigator for its customers in the digital world.Its over 1,000 MediaMarkt and Saturn stores are closely integrated with their online shops.MediaMarktSaturn has a total headcount of more than 60,000.MediaMarktSaturn Technology is working on making Europe's number one consumer electronics retailer the technology leader in its sector.To this end, several hundred developers, UX designers and system architects using state-of-the-art technology work hand in hand with business owners in agile teams to develop customer-focused technology solutions for more than 6 million customers every day in 11 countries.Technology Hub located in Barcelona , is one of the service units of MediaMarktSaturn Technology to deliver adequate staffing and engineering skills for the agreed deliveries of the global deployment plan for the entire group.(*) Diversity and equal opportunities are important to us.Research shows that women and people from underrepresented groups are less likely to apply if they don't meet all the criteria.If you are interested in this position but your experience doesn't align perfectly with every requirement, we still encourage you to apply.Additional Benefits Young environment , where not everything is written in stone, and where you are expected to contribute and co-create the culture of the Tech Hub andinternational collaboration model You'll have a10% discounton the entireMediaMarkt website , so you can treat yourself at a lower price whenever you want!On top of yourcompensation package , you can request Flexible Pay "MediaFlex program" (a.e. Ticket Restaurant, Private Health Insurance withSegurCaixa Adeslas , ...) Flexible workingtime and possibility to combine home office / presential working.Intensive workdayevery Friday and during summer The possibility to choose between2 offices : The first one is theMediaMarkt Iberia HQwith a very attractive menu at a price.You'll eat for less than €4!And the second office is located atPier01, in Barceloneta , right in the center of Barcelona.Free coffee and free fruit once a week There is atraining budget so you can continue developing the skills you need most to keep growing professionally and personally!Weoffer language classes :English, Spanish, and German On your birthday, you won't work !It's a day for you to enjoy without thinking about work You'll be working with the mostcutting-edge technological stackof the moment Job Infos Location:Barcelona, El Prat De Llobregat Media Markt Saturn Th Services Barcelona Department:HQ - IT Entrylevel:Professional Level Type of Employement:Full Time Working Hours:40 Persona:Job Requisition Tech Employee#J-*****-Ljbffr


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