Senior Software Engineer

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.

Tech Stack

• C# / .NET Core
• SQL (relational databases)
• MongoDB, Firestore (or other NoSQL DB)
• REST API development
• Batch / background processing
• Cloud platforms (AWS / Azure / GCP)
• CI/CD pipelines
• Distributed systems concepts

Responsibilities

• 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

Do you have experience in SQL?, 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
• Experience with scalable, high-load systems

Supportive and comfortable working environment

• Free online speaking club to practice English
• Training and self-development opportunities
• Team-building events and corporate parties
• Social security package and additional perks

Hiring Process Pre-screen interview with a Recruiter Technical interview Interview with the client References Job Offer

Wetelo is a software development company building custom SaaS products since 2010. We partner with startups and growing businesses to design and develop scalable, business-driven products, taking full ownership from idea to long-term support.