.NET developer in fintech

VOLO is looking for experienced and goal-oriented Senior .NET Developer to join our enterprise-focused team, contributing to complex projects for international clients.

• Design, build and own backend services and APIs for client-facing products in fintech, banking, education and other industries
• Design system architecture for new products and features, choosing service boundaries, data ownership, communication patterns and deployment approach
• Evaluate architectural trade-offs (monolith vs. microservices, build vs. buy, etc)
• Write clean, testable, secure code, and keep quality and architectural consistency high through design and code reviews
• Find and fix performance bottlenecks across the API, database and infrastructure layers
• Define and track performance targets (latency, throughput, resource usage)
• Lead the modernization of legacy systems, including refactoring, gradual migration and breaking up monoliths where it makes sense
• Contribute to technical estimates and solution designs for new projects and client proposals
• Work closely with product, frontend, QA and DevOps across the full delivery lifecycle
• Mentor mid-level and junior engineers and help shape engineering standards

• 5+ years of backend development with C# and .NET
• Strong OOP, SOLID principles and design patterns
• Experience designing RESTful APIs with ASP.NET Core, including API contracts and versioning
• Solid async programming and concurrency in .NET
• Experience optimizing database performance: reading execution plans, choosing between EF Core and raw SQL/Dapper where it matters
• Experience with authentication and authorization (OAuth 2.0, OpenID Connect, JWT)
• Architecture and distributed systems
• Strong SQL skills (schema design, indexing, query optimization), plus Entity Framework Core and LINQ
• Strong grasp of architectural patterns: Clean/Hexagonal Architecture, Domain-Driven Design, CQRS, Event Sourcing
• Experience with distributed system patterns: Saga, idempotency, retries with backoff, API Gateway, CAP trade-offs
• Practical experience with message brokers (RabbitMQ, Kafka or Azure Service Bus)
• Experience with caching strategies and distributed caching (Redis)
• Experience designing for scale, using techniques such as horizontal scaling, connection pooling, pagination, batching and background processing
• Будет плюсом: Cloud experience (Azure or AWS); Experience using AI-assisted development tools in daily work; Frontend experience with TypeScript and Angular or React, enough to contribute to full-stack features

• Engaging work environment
• International business trips
• Competitive compensation
• Opportunities for professional growth
• Team of top-tier professionals
• Rest & relaxation areas
• Comprehensive health plan
• Company retreats & team building activities