Job Description

Senior Back-End .NET Engineer – Repo Trading Platform | B2B | Warsaw (Hybrid)
Are you a passionate back-end engineer with deep .NET expertise and a love for building scalable trading platforms? Join a high-impact team working on a greenfield repo trading initiative at the intersection of rates and credit.
This is a backend-only role focused on microservices, cloud-native architecture, and direct collaboration with traders and credit teams. You'll be part of a strategic build-out using modern tech and agile practices.
 
Key Highlights:
•    Tech Stack: C#/.NET 8, AWS, Docker (Kubernetes roadmap), REST APIs, microservices
•    Domain: Repo trading, credit integration, fixed income workflows
•    Environment: Collaborative team, direct trader exposure, hands-on BAs
•    Location: Warsaw-based, hybrid (negotiable)
•    Contract: 12-month rolling, part of a 2-year strategic project
•    Interview Process: 2 stages + take-home assignment (AI tools allowed, but understanding required)
 
What You’ll Be Doing:
•    Building and scaling a repo trading platform with 50–60 microservices per project
•    Integrating new markets and asset types
•    Collaborating with traders and credit teams to shape workflows
•    Contributing to architectural decisions and CI/CD pipelines
 
What We’re Looking For:
•    Strong experience with C#/.NET (ideally v8)
•    Solid understanding of async programming, multithreading, and distributed systems
•    Experience with cloud (ideally AWS) and containerisation (Docker; Kubernetes a plus)
•    Exposure to financial platforms or trading systems preferred
 
This is a rare opportunity to work on a greenfield platform with direct business impact, modern tech, and a collaborative team culture. If you're ready to shape the future of repo trading, we’d love to hear from you.