Senior .Net Back-end Developer Fintech Web3

B2B Contract
Fully remote (except Russia and Belarus)
Mandatory experience working in the FinTech domain.

As a team member, you'll be involved in:

Designing and implementing event‑driven and microservice-based architectures using modern .NET technologies.

Building and maintaining RESTful APIs and background services for real-time financial operations.

Participating in Agile ceremonies (grooming, planning, estimation, retrospectives) with product, QA, and DevOps teams.

Taking ownership of features from concept to production—including architecture, testing, and monitoring.

Proactively refactoring legacy components and evolving the platform architecture for scalability, security, and maintainability.

Translating product and compliance requirements into robust unit, integration, and end‑to‑end test coverage.

Contributing to code reviews, CI/CD workflows, documentation, and team knowledge sharing.

Requirements:

Mandatory experience working in the FinTech domain.

5+ years of commercial experience with .NET/C# in production systems.

Hands-on experience with .NET Core 3.1+ / .NET 6+, ASP.NET Core Web API, and background services.

Strong understanding of distributed systems and event-driven architecture.

Practical knowledge of multithreading, async/await, and designing resilient, high-load systems.

Experience with MSSQL, Redis, data caching, transactions, and query optimization.

Understanding of message orchestration patterns (saga, idempotency, DLQ).

Solid knowledge of SOLID principles, clean code practices, and design patterns.

Good English for documentation; Ukrainian or Russian for team communication.

Nice to Have:

Experience deploying and running services in a cloud environment; familiarity with containerization (Docker) and CI/CD pipelines.

Experience with Azure services (Azure Functions, Service Bus, Cosmos DB, Key Vault, etc.).

Familiarity with Kafka/Azure EventHubs, gRPC, or message queues (RabbitMQ, Azure Service Bus).

Experience with observability and monitoring tools (App Insights, Prometheus, OpenTelemetry).