Senior .NET Engineer (AI)

Location: Sofia, Bulgaria — Hybrid

Company

Avenga is an international engineering firm with 6,000+ experts worldwide, helping businesses operate with AI-native engineering across industries and technologies.

What you will do

• Design, build, and enhance secure, maintainable .NET applications and REST APIs.
• Contribute to cloud-based service design and integrations, including messaging and gRPC where appropriate.
• Write automated tests, review code, and document technical decisions.
• Deploy, monitor, debug, and troubleshoot applications and APIs in cloud environments.
• Investigate complex production incidents and deliver reliable fixes across the software lifecycle.
• Collaborate with distributed engineering and business teams across EMEA to clarify requirements and improve delivery processes.

Requirements

• Senior-level experience delivering production applications and APIs with C# and supported .NET versions.
• Strong understanding of object-oriented design, REST APIs, and web standards, with sound judgement around security, resilience, and maintainability.
• Hands-on experience deploying, debugging, and troubleshooting web applications and APIs in a cloud environment.
• Experience writing automated tests and using Git for software collaboration.
• Working knowledge of SQL and relational databases for application data access and diagnosis.
• Ability to investigate complex problems, identify root causes, and deliver reliable fixes across the software lifecycle.
• Clear English communication and experience collaborating with distributed technical and business teams.
• Ability to mentor other engineers.

Nice to have

• Experience in an Agile delivery environment or developing N-tier solutions.
• Experience with microservices, RabbitMQ or other message brokers, or gRPC.
• Hands-on experience with AWS, Azure, OpenShift, or Kubernetes.
• Experience with CI/CD and deployment automation tools such as Jenkins or Ansible Tower.

Culture & Benefits

• Long-term project for an existing client.
• Hybrid work arrangement in Sofia.
• Collaboration with distributed teams across EMEA.
• Equal-opportunity and respectful working environment committed to inclusion and belonging.

Hiring process

• Submit a CV describing core skills and career goals.
• Complete a talent call, technical interview, and, for some roles, a customer interview.