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 deg 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).