About the role

We are looking for a Platform Backend Engineer to join our tech team and take ownership of the design, development, and optimization of backend services, APIs, microservices, and data pipelines. You’ll build a high-performance platform capable of handling large data volumes, focusing on efficient code, data transmission, messaging systems, database interactions, and overall backend performance.

This is a hands-on engineering role working closely with cross-functional teams including frontend, mobile, QA, and operations. You’ll actively participate in technical decision-making, backend architecture design, and the continuous improvement of our platform.

We’re looking for a versatile backend engineer—not purely infrastructure-focused, nor exclusively backend—but someone comfortable working across the stack as needed, emphasizing code efficiency, database optimization, and robust data flow.

What you’ll be doing:

Microservices & APIs

• Develop and maintain efficient microservices primarily in Go, Python, or Rust
• Design high-concurrency RESTful APIs emphasizing low latency and horizontal scalability

Data Management & Modeling

• Design, optimize, and maintain database schemas, particularly PostgreSQL with TimescaleDB for handling large-scale time-series data
• Ensure optimized indexing, partitioning, and query efficiency for rapid data retrieval

Messaging & Data Pipelines

• Build robust messaging systems using message queues like RabbitMQ, SQS, or similar
• Implement efficient ETL/ELT pipelines ensuring high data quality, consistency, and traceability for downstream analytics

Containerization & Deployment

• Package applications using Docker and deploy/manage services in orchestrated Kubernetes environments

Automation & CI/CD

• Define and maintain automated testing and deployment pipelines using Jenkins, GitLab CI, or GitHub Actions
• Occasionally manage cloud resources through infrastructure as code (Terraform/CloudFormation) when necessary

Collaboration & Cross-functional Work

• Collaborate closely with frontend, mobile, QA, and operations to identify bottlenecks and implement solutions
• Participate in code reviews, technical documentation, and promote best engineering practices across teams

What we’re looking for:

• 3+ years of experience developing backend services, APIs, microservices, and data-driven applications
• Strong programming skills in Go, Python, or Rust
• Proven experience with relational databases, ideally PostgreSQL; TimescaleDB experience is a significant plus
• Familiarity with message brokers (RabbitMQ, SQS, Kafka, or similar)
• Hands-on experience with Docker and Kubernetes
• Experience building and maintaining CI/CD pipelines (Jenkins, GitHub Actions, or GitLab CI)
• Comfortable working with infrastructure as code (Terraform or CloudFormation) as needed

What awaits you at b4b:

• Have a visible impact: Your work will shape the brand voice and market presence of a fast-growing, mission-driven company.

• Collaborate with passionate people: Join a team that truly cares about sustainability, technology, and doing things right.

• Grow your career: Work across offline and digital marketing in a role that offers broad exposure and development opportunities.

• Work globally, act locally: Coordinate with stakeholders across Spain, the UK, Norway, and beyond — while based in our Barcelona HQ.

• Be part of something bigger: Help drive the maritime industry's transition to cleaner, smarter, and safer solutions.