Betsson – Senior Software Engineer

Context

From 2021 to 2025 I worked as a Senior Software Engineer in Betsson Group's Player Rewards & Gamification value stream. The team built and maintained event-sourced gamification systems used in real time across many brands and markets, under high load and strict regulation.

Examples of projects: Tournaments, Loyalty Points, Levels & Achievements.

Work

Architecture

Applied CQRS, Domain-Driven Design, Event Modeling and Event Sourcing
Introduced .NET Aspire to simplify developing and testing the distributed applications
Built proofs of concept for the actor pattern with Microsoft Orleans
Worked closely with the Enterprise Architect and Engineering Manager on architectural and regulatory requirements

Backend development

Built and maintained services with C#, .NET 5–9 and ASP.NET Core
Built Blazor-based back-office tools
Designed the PostgreSQL data model for the Levels application

Automation

Maintained and improved the CI/CD pipelines in GitHub Actions and Octopus Deploy
Containerized the Levels application with Docker

System integration

Optimized the Kafka message processing in the Tournaments application
Designed and maintained REST APIs and legacy WCF integrations

Team

Mentored junior developers through knowledge-sharing sessions and pair programming
Took part in technical interviews and candidate assessments
Gave architectural and implementation guidance to team members

Results

Nearly 1000% higher Kafka message throughput in the Tournaments application

Consultant, then employee

My four years at Betsson — first as a consultant for roughly two years, then as an employee for another two — were an exception to my usual freelancing. I stayed because I enjoyed the company and the colleagues, and left only because I eventually missed the freedom and variety of consulting.