Senior C# / .NET Engineer for 4-5 month project

Seeking a highly skilled and experienced Senior C# /.NET Engineer to join our dynamic team on a long-term part-time basis for a 4-5 month project.

Requirements

• Strong hands-on expertise in C# and.NET (target:.NET 8+) and designing scalable web backends.
• Proven experience building API-first systems (REST), with strong data modeling and transaction integrity practices.
• Solid experience with relational databases and complex queries; ability to work effectively with PostgreSQL (nice to have PostGIS) teams and data models.
• Experience implementing logging/metrics and building observable systems (e.g., Seq, Prometheus, Grafana or equivalents).
• Experience planning and executing performance testing; ability to define a validated load scenario (vendor responsibility) and run stress tests.
• Ability to lead engineers: code reviews, engineering standards, mentoring, estimation, risk management, and delivery ownership.
• Comfort working in a government/regulatory context where traceability, controlled changes, and formal acceptance processes matter.
• Ability to work with Ukrainian-language UI/UX and documentation constraints.