Back-end Developer

Wärtsilä is a world leader in marine technology and is seeking a Back-End Developer with front-end exposure to build scalable backend systems for a data-intensive platform powering hundreds of installations worldwide.

• Design and build scalable backend services, APIs, and data pipelines
• Work on our streaming data platform (real-time data processing, ingestion, and distribution)
• Ensure systems are reliable, observable, and performant
• Contribute to data modeling, database design, and architecture decisions
• Collaborate with front-end developers to deliver seamless end-to-end features
• Set up and improve monitoring, logging, and data quality checks
• Take ownership from development to deployment and production operations
• Continuously improve systems through experimentation and innovation

• A degree in Computer Science (or similar) or 3+ years of experience
• Strong backend development skills (Java and/or Python)
• Experience with API design and distributed systems
• Experience with data streaming or messaging systems (e.g., Kafka)
• Experience with cloud infrastructure (AWS) and containerization (Docker, Kubernetes)
• Solid understanding of DevOps practices, CI/CD, and system reliability
• Experience with databases (relational and/or time-series)
• A mindset focused on performance, scalability, and maintainability
• Ability and willingness to collaborate across the stack, including front-end teams
• Experience working in Agile/Scrum environments
• Nice to have: Exposure to front-end development (TypeScript/JavaScript)
• Nice to have: Experience with data-intensive applications or analytics platforms
• Nice to have: Familiarity with industrial protocols (OPC-UA, Modbus, NMEA)
• Nice to have: Interest in UX or data visualization

• Build and operate high-impact backend systems used globally
• Own your services end-to-end: design → build → run
• Work in a culture of trust, ownership, and collaboration
• Expand your skill set across cloud, data, and full-stack development
• Contribute to solutions that support sustainable energy and decarbonisation
• Encourage curiosity, initiative, and continuous learning