Job Description

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

Responsibilities:
  • 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
Required Qualifications:
  • 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)
  • 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
Benefits:
  • 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
Nice To Have:
  • 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
Technologies:
  • .NET
  • C#
  • ASP.NET Core
  • SQL
  • EF Core
  • Dapper
  • LINQ
  • RabbitMQ
  • Kafka
  • Azure Service Bus
  • Redis
  • Azure
  • AWS
  • TypeScript
  • Angular
  • React
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