Senior .NET Backend Developer (1-year contract/full-time/onsite)

Nextjob
ContractColombo, Sri Lanka

The Role

We are scaling up a high-performing delivery team for a global client and we need serious talent, fast. If you're a senior engineer or delivery lead who thrives in fast-paced, onsite teams, this is your move.

📍 Location: WFO or Onsite, Colombo (Sri Lanka)

📄 Category: Full-time, 12-month contract (1 YR FTC)

⏱️ Notice Period: Immediate joiners or up to 1 month

💼 Experience: Minimum 5+ years hands-on exposure

Key Responsibilities

  • Develop services and Web APIs using .NET Core and C#.
  • Design data access layers and integrate with internal and external systems.
  • Ensure performance, security, and maintainability of solutions.
  • Write automated tests and take part in code reviews.
  • Collaborate with front end, QA, and product teams.
  • Support and troubleshoot applications in production.

Education & Relevant Experience

  • Bachelor's degree in Computer Science, Software Engineering, or related field.
  • 5+ years of development experience on the .NET stack.
  • Travel, airline, or e-commerce platform experience is preferred.

Knowledge, Skill, Abilities & Others (KSAOs)

  • 5+ years of development experience on the .NET stack.
  • Strong C# and .NET Core / .NET 6+ skills.
  • ASP.NET Core Web API development.
  • Entity Framework and SQL Server.
  • REST API design and integration.
  • Automated testing (xUnit or NUnit) and Git based CI/CD.
  • Azure cloud services.
  • Microservices and messaging.
  • Docker and Kubernetes.
  • Travel or e-commerce domain experience.
  • Fluent in English.

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