Senior Software Engineer – Backend Platform

What Youll Work With

You will work with a backend stack centred around:

• Java
• Spring Boot
• Kafka
• PostgreSQL
• Kubernetes

What Youll Do

• Build and evolve backend services and platform components using Java and Spring Boot
• Design APIs data models transaction flows internal tools and product-facing systems
• Design and build Kafka-based event-driven services and high-throughput transaction flows
• Design event flows with careful attention to ordering idempotency retries failure handling and data consistency
• Build systems using PostgreSQL where performance correctness and data integrity matter
• Deploy and operate backend services in Kubernetes-based production environments
• Drive technical decisions around consistency latency scalability reliability and security
• Make informed trade-offs between correctness performance complexity and long-term maintainability
• Identify bottlenecks and continuously improve throughput latency observability and system quality
• Own critical systems end-to-end from design and implementation to production behaviour
• Strengthen engineering quality through code reviews design discussions and knowledge sharing

Qualifications :

Who You Are

• You have strong computer science fundamentals
• You have substantial experience building reliable observable high-performance backend systems
• You are comfortable working with distributed systems databases and production services
• You can reason clearly about correctness concurrency failure modes performance and system design
• You understand scalability beyond infrastructure alone including data modelling consistency caching and concurrency control
• You are comfortable making architectural decisions with long-term consequences
• You take ownership of problems and drive them to reliable outcomes
• You want to work in a small team with high standards and direct technical feedback

What Will Strengthen Your Application

• Strong professional experience with Java and Spring Boot
• Strong experience with Kafka or similar event-streaming/message-driven systems
• Experience designing event flows with careful attention to ordering idempotency retries failure handling and data consistency
• Strong understanding of PostgreSQL relational database design transactions indexing and query performance
• Strong experience deploying operating or troubleshooting backend services in Kubernetes-based production environments
• Experience designing backend systems for high-throughput low-latency business-critical workloads
• Experience with distributed systems design especially around consistency partitioning concurrency and failure handling
• Experience with transactional data modelling and correctness guarantees in financial gaming trading payments or other high-integrity domains
• Experience with production observability including metrics tracing structured logging alerting and performance analysis
• Security-minded engineering including authentication authorisation secrets handling secure service communication and defensive design
• Clear communication and the ability to discuss technical trade-offs thoughtfully

Bonus Experience

• Payments fintech gaming trading or other real-money transaction domains
• Multi-region system design with low-latency routing and strong data integrity guarantees
• Caching and data-access strategies under strict correctness constraints
• Infrastructure as code and automated delivery pipelines
• Load testing capacity planning and performance regression prevention
• Incident response and production reliability ownership

This Role Is Likely Not for You If

• You prefer clearly scoped implementation tasks over owning technical direction
• You are uncomfortable making decisions with architectural or long-term design impact
• Your experience with backend systems at scale is limited or surface-level
• You tend to treat performance scalability reliability or security as secondary concerns rather than core design constraints

Additional Information :

Were building something new within Evolution.
This is not an iteration on an existing product or a role focused on maintaining established systems. It is a chance to help define a new platform from first principles using modern backend technologies to solve hard engineering problems under real production constraints.
The system were building will operate across regions and process thousands of real-money transactions per second with strict consistency guarantees. Low latency correctness performance and security are not goals we optimise for later. They are design constraints from day one.
We are looking for senior engineers who want to work close to the core of the platform: backend services event-driven systems databases production infrastructure and performance-critical product flows.
 

Our benefits are

• Competitive pension health and medical insurance
• 30 paid vacation days
• Fitness benefit (Friskvårdsbidrag)
• Professional growth
• Sport activities parties team buildings

This is a 100% on-site position. Based in Stockholm Sweden. 

Remote Work :

No

Employment Type :

Full-time