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

Intetics Inc., a global technology company providing custom software application development, distributed professional teams, software product quality assessment, and “all-things-digital” solutions, is seeking a highly skilled and experienced Senior C# / .NET Engineer to join our dynamic team on a long-term part-time basis.

Responsibilities

• Own backend technical leadership: architecture, code quality, delivery plan, and hands-on implementation for the SAR area-based modules.
• Design and implement REST APIs and service-oriented backend components.
• Ensure robust observability:
• Log key operations, including geospatial calculations and user actions.
• Build production-grade metrics (Prometheus/Grafana or equivalent).
• Drive performance and reliability engineering, including preparation and execution of load/stress testing up to 3,000 simultaneous connections.
• Align the backend with security/traceability needs (auditability, immutable action history, etc.) and support integrations that rely on GOV.ID / QES / BankID (working with stakeholders that provide tokens/certificates).
• Coordinate technical work with the project working group, and contribute to inception-stage outputs (detailed business processes + technical design) before implementation.
• Contribute to delivery and handover: deployment support, documentation, and warranty period collaboration through rollout support.

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 (you won’t be the DBA, but you must be fluent in how geospatial data is stored/queried).
• Nice to have - practical understanding of GIS-related backend needs (geospatial operations, topology constraints, format exports), and familiarity with libraries like NetTopologySuite / GDAL.
• 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.
  
  Nice to have:
• Experience with geospatial calculations and data integrity (intersection logic, validations, duplicate checks, etc.), collaboration with GIS engineers; leverage geospatial libraries where relevant (e.g., NetTopologySuite, GDAL).