Software Engineer (Backend / System-Level — Microsoft Stack)

5+ years of backend development experience in enterprise/mission-critical systems Strong C# and .NET (6+) experience, with production work on ASP.NET Core Web API Practical experience shipping and maintaining .NET services (most new work on .NET 8 LTS) Experience working with SQL Server (advanced queries, performance tuning mindset) Experience designing and building REST APIs (JSON; XML as needed) Knowledge of authentication/authorization patterns (JWT, OAuth2; Entra ID is a plus) Secure coding mindset (OWASP Top 10 awareness, data protection basics) Unit testing experience (xUnit/NUnit/MSTest) and familiarity with mocking frameworks Git proficiency and strong PR discipline (branching, pull requests, merge practices) Experience working in Agile/Scrum teams and collaborating with Product Owners and QA Azure experience in production (App Services/Functions/Storage) and Azure DevOps pipelines Familiarity with logging/monitoring (Application Insights, Serilog, or similar) Microservices basics and CI/CD best practices (even if not fully automated yet) Docker basics (preferred) and comfort working across staging/production environments Strong debugging skills (root cause analysis, performance profiling when needed) Comfortable working with uneven documentation and improving it as part of delivery English B2+ required (docs and calls) Long-term B2B contract on a large, mission-critical enterprise platform (vendor → internal transition) High-impact backend/system-level work: .NET 8 (LTS) services, API design, reliability, performance, and modernization of legacy areas (ASP.NET 4.8/WCF) Real engineering standards: PR-only workflow, branch protection, mandatory code review, security scanning (SAST) before release Direct collaboration with a Lead Architect, Product Owner, QA, and DevSecOps (clear ownership and fast decision paths) Opportunity to shape delivery as we move from partial manual releases to stronger CI/CD and deployment automation (Azure DevOps) Strong focus on code quality, maintainability, observability, and safe production change (logging/monitoring, rollback discipline) Remote-first team with flexible working style and defined time-zone overlap (no “always online” culture) Work in English with documentation and engineering artifacts kept in English Competitive monthly rate in USD/EUR with reliable, on-time payments (B2B) ,[Build and maintain backend services and APIs in C#/.NET (primarily .NET 8 LTS), Implement backlog items from user stories and technical designs within approved architecture, Translate functional requirements into scalable technical solutions and clean business logic, Write clean, maintainable code using SOLID and agreed design patterns, Work safely in legacy areas (ASP.NET Framework 4.8/WCF) and support modernization efforts, Create and maintain unit tests and support integration testing and QA validation cycles, Participate in peer code reviews and enforce PR/branching standards (no direct pushes to main), Refactor and optimize code to improve performance, reliability, and maintainability, Apply secure coding practices (OWASP) and meet DevSecOps/SAST quality gates before release, Implement authentication/authorization and RBAC patterns with proper data protection controls, Optimize SQL Server queries and data access patterns and troubleshoot performance issues, Implement logging, monitoring hooks, and robust exception handling for production observability, Support CI/CD integration (Azure DevOps) and assist with staging/production deployments, Troubleshoot production incidents, perform root cause analysis, and deliver preventative fixes, Collaborate daily with Architects, Product Owners, QA, DevSecOps, and UI/UX where needed, Escalate technical risks and architectural concerns early with clear options and tradeoffs] Requirements: .NET, Azure, ASP, WCF, SQL Server, Entity Framework, Git, Azure DevOps, C#, Web Api, .NET Core, Performance tuning, REST API, XML, Unit testing, xUnit, NUnit, QA, Microservices, Docker, OWASP