Senior Backend Engineer - FinTech, Hybrid (Stockholm)

MAJORITY; Stockholms kommun; Hybrid; SEK 700,000 - 1,000,000; Full time

Job summary

MAJORITY is seeking a Senior Backend Developer to join our Stockholm team. You will own and evolve real-time money movement services built with C# microservices on Kubernetes, with an emphasis on reliability and scalability in production.

You will collaborate across the engineering group, take initiative, and drive technical decisions while contributing to maintainable, high-quality code and rapid delivery for a growing FinTech platform.

Qualifications

• Experience building and running microservices and event-based systems in production at scale.
• Track record of shipping real systems and maintaining them in production.
• Strong understanding of distributed systems reliability: idempotency, retries, ordering, and eventual consistency.
• Good understanding of high level architecture and design.
• Excellent English communication skills.
• Experience with C#, Kubernetes and SQL, or similar.
• Experience with payment platforms, FinTech, Banking or security.
• Experience growing with a team on evolving products with many users.
• Experience building new products with maintainability and scalability in mind.
• Vision for product development and codebase evolution.
• Uses AI tools like Claude or Codex in daily work.
• Loves R&D and exploring new technology.
• Pleasure to work with

Responsibilities

• You take initiative and ownership, and don't wait to be told what to do.
• You are always curious and always learning.
• You take pride in the quality of your work.
• You consider the whole system, cover the edge cases and test your codeYou are able to reason through the trade-offs and dare to make decisions for the benefit of the organization
• You lead technical decisions and see them through.
• You think about the bigger picture: how services fit together and how the system will grow.
• You love to share your knowledge and learn from your colleagues.

Job description

MAJORITY is seeking a Senior Backend Developer to join our Stockholm team. You will own and evolve real-time money movement services built with C# microservices on Kubernetes, with an emphasis on reliability and scalability in production.

You will collaborate across the engineering group, take initiative, and drive technical decisions while contributing to maintainable, high-quality code and rapid delivery for a growing FinTech platform.