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We are looking for a Senior Back-End Engineer (C# / .NET Core) to join a long-term fintech platform in the investment management domain. You will work on a financial platform that manages investment data, portfolio operations, and automated financial workflows. The platform consists of REST APIs and batch (command-line) applications.
Job Responsibility:
Design and implement backend features and services in .NET Core
Maintain and evolve the existing fintech platform
Take ownership of backend components from design to production deployment
Develop and extend REST APIs used by internal and external systems
Implement integrations with brokers, payment providers, and third-party services
Write high-quality, scalable, and fault-tolerant code
Improve performance, reliability, and maintainability
Troubleshoot and support production systems
Participate in technical discussions and architectural decisions as a senior contributor
Review code and collaborate closely with other senior engineers
Contribute to CI/CD and cloud infrastructure improvements when relevant
Requirements:
5+ years of backend development experience
Strong experience with C# / .NET Core
Strong experience with SQL (including performance optimization)
Experience with MongoDB and/or other NoSQL databases
Strong experience designing and implementing REST APIs
Experience developing and operating applications in cloud environments (AWS, Azure, or GCP)
Experience running and maintaining production systems
Solid understanding of distributed systems and background processing
Ability to work autonomously in a senior, flat team structure
Good English (B2+)
Nice to have:
Experience with CI/CD pipelines and Kubernetes
Experience with event-driven systems (RabbitMQ or similar)
Experience in financial services / investment platforms (non-crypto)
Understanding of portfolio logic or financial data flows