Senior .NET Developer

About the role

VOLO is looking for an experienced, goal-oriented Senior .NET Developer to join its enterprise-focused team and contribute to complex projects for international clients. The role covers backend services and APIs for client-facing products in fintech, banking, education and other industries.

Key responsibilities

• Design, build and own backend services and APIs for client-facing products
• Design system architecture, including service boundaries, data ownership, communication patterns and deployment approach
• Evaluate architectural trade-offs such as monolith versus microservices and build versus buy
• Write clean, testable, secure code and maintain quality through design and code reviews
• Find and fix performance bottlenecks and define performance targets (latency, throughput, resource usage)
• Lead modernization of legacy systems, including refactoring, gradual migration and breaking up monoliths
• Contribute to technical estimates and solution designs for new projects and client proposals
• Work with product, frontend, QA and DevOps teams across the full delivery lifecycle
• Mentor mid-level and junior engineers and help shape engineering standards

Required profile

• 5+ years of backend development with C# and .NET
• Strong OOP, SOLID principles and design patterns
• RESTful API design with ASP.NET Core, including contracts and versioning
• Async programming and concurrency in .NET
• Database optimization, authentication and authorization (OAuth 2.0, OpenID Connect, JWT)
• Architecture and distributed systems, including Clean/Hexagonal Architecture, DDD, CQRS, Event Sourcing and Saga patterns
• Message brokers (RabbitMQ, Kafka or Azure Service Bus), Redis caching and scaling techniques
• Nice to have: cloud experience (Azure or AWS), AI-assisted development tools, and TypeScript/Angular or React

What we offer

• Engaging work environment and international business trips
• Competitive compensation and opportunities for professional growth
• Health plan, rest and relaxation areas, company retreats and team building