Senior Software Engineer - Tieto Banktech

Tieto

Solna, Sweden

We are looking for a Senior Software Engineer with strong hands-on expertise and a passion for building high-quality systems. In this role, you will take technical ownership of our Equity post-trade platform, driving architecture, modernization, and delivering robust solutions in a complex domain.

What You’ll Do

Take end-to-end ownership of features from design to production;
Design, build, and implement solutions using C#, .NET, REST APIs, and microservices;
Drive modernization of legacy, database-heavy systems into modular, maintainable architectures;
Contribute directly to architecture and design decisions with a strong engineering mindset;
Define and execute technical solutions aligned with product and business needs;
Write clean, efficient, and production-grade code with focus on performance and scalability;
Take ownership of problem-solving in a complex, high-impact domain;
Work effectively in a distributed setup across locations.

What We’re Looking For

Strong experience with C#, .NET, SQL, APIs, and microservices architecture;
Proven track record in modernizing legacy systems and refactoring monolithic applications;
Solid understanding of system design and building scalable, resilient solutions;
Hands-on engineer with a strong sense of ownership and accountability;
Ability to work independently and drive technical solutions forward;
Experience with Azure, CI/CD pipelines, Git, and DevOps practices.