Senior SW Engineer - Tieto Banktech (m/f/d)

Employment: Full-time Experience level: Mid-Senior Level Job Description 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 Nice to Have  Experience in Capital Markets or Equity post-trade systems  Understanding of equity trading workflows  Experience with Docker, Kubernetes, and cloud-native architectures  Background in product-driven engineering environments  We Offer  Real ownership and impact on critical banking systems  Opportunity to shape architecture and technical direction  Focus on engineering excellence and high-quality delivery  Flexible hybrid work model in Sweden  Continuous learning and growth opportunities  Interested?  Apply today — interviews are ongoing.  For more information, contact: recruitmentinbanking@tieto.com   Background checks apply.  Tieto declines calls from recruitment agencies. Additional Information At Tieto, we believe in the power of diversity, equity, and inclusion. We encourage applicants of all backgrounds, genders (m/f/d), and walks of life to join our team, as we believe that this fosters an inspiring workplace and fuels innovation. Our commitment to openness, trust, and diversity is at the heart of our mission to create digital futures that benefit businesses, societies, and humanity. Diversity, equity and inclusion | Sustainability | Tieto Stay alert to recruitment scams: • Tieto only communicates via  @tieto.com  email addresses. • We never ask candidates to pay fees or share financial details during recruitment. • If you receive a suspicious message claiming to be from Tieto, don't respond — verify it via our official careers site. • For more information visit  Important Advisory Regarding Recruitment Fraud | Tieto Blog