.NET Developer

Jefferson Frank; Stockholms kommun; On-site; SEK 520,000 - 680,000; Full time

Job summary

Jefferson Frank in Stockholm is seeking a .NET Backend Developer to join a fintech team building API-driven infrastructure for Nordic and European markets. This on-site role focuses on a production-grade .NET microservices platform deployed in Azure with Docker and Kubernetes, offering hands-on ownership and growth into architecture over time.

You will work in a cross-functional environment, contributing to maintenance and new features, collaborating across services, and helping scale the

Qualifications

• 2+ years' experience with modern .NET.
• Experience working with APIs and microservices.
• Experience in Azure environments.
• Comfortable working with containerised applications (Docker/Kubernetes).
• Curious, driven, and eager to learn in a startup-style environment.
• Able to grasp complex fintech and payment flows.
• Swedish speaking.

Responsibilities

• Deeply understand an existing production-grade .NET microservices platform end-to-end.
• Work across services deployed on Azure using Docker & Kubernetes.
• Contribute to maintenance and new feature development in a cross-functional team.
• Gradually take on more complex development challenges as platform knowledge grows.
• Help evolve system architecture with potential architectural responsibilities.
• Support scaling engineering as the company expands into new markets.

Tools

Azure

Docker

Kubernetes

APIs

.NET

Swedish

Job description

.NET Backend Developer - Fintech (Stockholm, On‑site)

We're working with a fast‑growing fintech company that operates at the heart of the open banking ecosystem, building API‑driven infrastructure used by financial services, ERP systems, and accounting platforms across the Nordics and Europe.

This is a permanent .NET Backend Developer role based in a Stockholm office, joining a team that's expanding due to continued success and growth.

What you'll work on

• Getting deep into an existing, production‑grade .NET microservices platform to understand how the system works end‑to‑end
• Working across multiple services deployed on Azure using Docker & Kubernetes
• Contributing to both maintenance and new feature development as part of a cross‑functional team
• Gradually taking on more complex development challenges as you build platform knowledge
• Playing a role in evolving the system architecture, with clear opportunities to grow into architectural responsibility over time
• Supporting a scaling engineering environment as the company expands into new markets

What we're looking for

• 2+ years' experience with modern .NET (open to both early‑career developers and senior engineers)
• Experience working with APIs and microservices
• Experience in Azure environments
• Comfortable working with containerised applications (Docker/Kubernetes)
• Curious, driven, and eager to learn in a startup‑style environment
• Able to grasp complex fintech and payment flows
• Swedish speaking
• Financial / banking experience is a plus, but not required
• Interest in AI‑assisted development is a bonus (the team actively embraces AI tools)

Why this role?

• High‑growth fintech operating successfully across the Nordics and the Netherlands, with strong bank and customer relationships
• Modern tech stack with an active push toward AI usage throughout development
• Collaborative, supportive, and open culture
• Clear career progression, including future architectural paths if that's where you want to go
• Challenging, meaningful product work in payments, banking, and financial infrastructure