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Responsibilities
Our client is looking for a Mid BackEnd Engineer with a strong focus on API development to join their Product Development team. You will contribute to designing and building scalable backend services that power high-impact, data-driven products in the renewable-energy technology space.
If you enjoy solving complex problems, writing clean and reliable code, and working with modern cloud-native architectures, this role will place you at the core of a mission-driven engineering environment.
📍 Central Barcelona (very well connected).
💻 SaaS platform.
Key Responsibilities
* Develop, maintain, and document RESTful APIs for both public and internal use.
* Write clean, maintainable, and testable code following best engineering practices.
* Troubleshoot, debug, and optimise existing APIs and backend services.
* Diagnose and solve complex problems across API layers, database queries, and cloud environments.
* Participate in code reviews and contribute to architectural and performance improvements.
* Collaborate with cross-functional teams to design and deliver scalable interfaces.
* Stay up to date with the team’s technologies and share knowledge proactively.
Requirements
Mandatory
* 3–5 years of experience in backend development, with strong focus on APIs.
* Solid knowledge of TypeScript and Node.js (experience in other languages is welcome, but TypeScript understanding is essential).
* Experience working with cloud environments (AWS preferred, but other cloud providers are also acceptable).
* Experience with relational databases (PostgreSQL is a strong plus).
* Strong understanding of REST API design and principles.
* Experience using Git, pull requests, and CI/CD workflows.
* Knowledge of clean code principles, design patterns, software architecture, cloud fundamentals, and API-first development.
* Strong communication skills in English, both written and verbal.
Nice to Have
* Experience with Serverless, especially AWS Lambda and API Gateway.
* Experience with event-driven systems (Kafka, AWS SQS, RabbitMQ…).
* Knowledge of Terraform or Infrastructure as Code.
* Familiarity with observability practices and tools: Grafana, CloudWatch, Express logging, etc.
* Awareness of database modelling best practices.
* Interest in mentoring or sharing knowledge within the team.
This job post is closed.