.Net Fullstack Engineer

Role : .Net Fullstack Engineer

Location : Krakow/ Warsaw Hybrid 2 days Office / 3 days Remote

Type : B2b /Employment contract

Roles and Responsibilities

• Design and implement backend services and APIs in .NET (6/8) with clean architecture.
• Build and maintain React + TypeScript frontends and incremental migrations from legacy UI.
• Read, refactor and extract business logic from legacy .NET and T‑SQL (stored procedures).
• Write and maintain automated tests: unit, integration, contract and e2e.
• Create and maintain CI/CD pipelines (Azure DevOps / GitHub Actions) and IaC artifacts.
• Instrument services for observability (metrics, logs, distributed traces) and alerting.
• Troubleshoot production incidents, deliver fixes and support deployments.
• Participate in architecture and domain modelling activities (DDD patterns, bounded contexts).
• Collaborate in Agile ceremonies, estimate work and define acceptance criteria.

Skills & Experience Requirement

• 5+ years commercial experience with C# and .NET (Framework + .NET Core / .NET 6+).
• Strong experience with EF Core and MSSQL (query tuning, transactions, indexing).
• Production experience with React and TypeScript.
• Practical experience building and securing REST APIs (validation, versioning, auth).
• Familiarity with Azure services (App Service, Functions, Azure SQL, Storage, Service Bus).
• CI/CD and automated testing experience (xUnit, Jest, Playwright/Cypress).
• Observability knowledge (Application Insights / OpenTelemetry, structured logging).
• Ability to read and reason about legacy codebases (ASP.NET MVC, Razor, WPF, WinForms).
• Good Git practices and code review discipline.
• English for technical communication

Nice To Have

• IaC experience (Terraform, Bicep) and deployment automation.
• Docker and Kubernetes (AKS) experience.
• Playwright codegen or Cypress e2e automation experience.
• Background in migrating monoliths to modular services or microservices.
• Familiarity with SQL Server internals and performance profiling.
• Azure certifications (e.g., Azure Developer Associate).