Senior Backend Developer
On-site · Oslo, Oslo, Norway
Job Summary
Senior Backend Developer in Oslo, responsible for designing, building, and operating backend services powering Spenn’s loyalty platform. Role emphasizes high-throughput, event-driven systems using Java/Kotlin, Confluent Kafka, PostgreSQL, and DynamoDB; API design for app, web, partner integrations; ensuring observability, performance, and reliability; technical leadership and mentoring; and leveraging AI coding tools to accelerate development while maintaining quality. Collaboration with architecture, DevOps, product, and other engineering teams to deliver features end to end.
Required Qualifications
- Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field, or equivalent practical experience
- Several years of professional backend development experience
- Strong proficiency in Java and/or Kotlin
- Hands-on experience building event-driven systems (Kafka preferred)
- Relational databases (PostgreSQL) and NoSQL stores (DynamoDB)
- Distributed systems understanding
- API design and microservices architecture
- Experience in fintech, payments, or high-reliability domains (advantage)
- Familiarity with cloud infrastructure (AWS) and CI/CD practices
- Proven ability to leverage AI tools to improve development efficiency
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