Senior C# .NET Developer (Multiple Openings)

Novi Beograd, Serbia
Hybrid Work Model (2 or 3 days onsite)
Full-time, B2B preferred but standard contract is also possible.
8 Open Positions

About the Role

Our client, a global technology company developing large-scale enterprise and financial systems, is expanding its engineering team in Belgrade and is looking for experienced C# .NET Developers.

In this role, you will work on complex, high-performance applications and enterprise platforms, contributing to the design, development, and improvement of mission-critical systems used by international organizations.

This position offers the opportunity to work with modern .NET technologies, cloud integrations, and distributed systems, while collaborating with experienced engineers in a highly professional environment.

Key Responsibilities

• Design, develop, and maintain scalable applications using C# and .NET technologies
• Work on large enterprise systems and complex technology platforms
• Participate in system architecture and technical solution design
• Solve challenging technical problems and contribute to product innovation
• Collaborate with engineering, QA, and DevOps teams
• Ensure high standards for performance, scalability, and code quality
• Mentor and support junior developers when required
• Contribute to technical standards, best practices, and development processes

Core Technical Skills

• C# (.NET Framework 4.8 and .NET 8)

Required Skills

• TypeScript
• JavaScript
• HTML
• SQL Server / Oracle

Rest of the Stack / Nice-to-Have Skills

• Web & Application Development
  • ASP.NET / ASP.NET Core MVC
  • Web application development
• API & Service Development
  • REST APIs / Web APIs
  • WCF / HTTP services
  • GraphQL
• Cloud & Infrastructure
  • Docker
  • Integration with Azure services
• Dependency Injection
  • Unity
  • Autofac

• Client-Side Technologies
  • TypeScript / JavaScript
  • Knockout.js (MVVM)
  • Promises
  • UI frameworks such as Kendo UI, Knockout, jQuery
• Databases
  • SQL Server and Oracle
  • Schema design
  • Query optimization and indexing
  • ORM technologies
• Messaging & Integration
  • Azure Service Bus
  • RabbitMQ
  • Kafka
  • Third-party service integrations
• Concurrency & Performance
  • Asynchronous programming (async/await)
  • Multithreading and background processing
  • Performance optimization and memory management
  • Caching strategies
• Reporting
  • Crystal Reports integration
  • BCP
• Testing
  • Automated testing with NUnit (unit and integration tests)
• Observability & Monitoring
  • Application Insights
  • Logging and telemetry
• Security
  • OWASP secure development practices
  • Static code analysis and security scanning tools (e.g., CxOne)
• Developer Tools
  • Visual Studio
  • PowerShell
  • Postman / Bruno
  • JetBrains tools (dotTrace, dotMemory)
  • AI-assisted development tools (e.g., GitHub Copilot)
• DevOps & Source Control
  • Git / GitHub
  • TeamCity

Interview Process

The hiring process includes two stages:

1. Technical Interview (L1)
2. Technical / Final Interview (L2)

Work Model

• Hybrid work model – 3 days onsite in Belgrade
• Opportunity to work on large-scale international technology project