FullStack Engineer (.NET + React)

🌍Work mode: 5 days in the office per month in Cracow.

⏰Start: from January 2nd, latest start date is February 1st.

📑Contract: B2B

⏳Duration: > 12 months contracts + extensions

📕Project language: English

⚙️Industry: Banking

💻Workload: Full time.

Summary:

The FullStack Engineer will play a crucial role in modernizing a portfolio of approximately a dozen .NET applications and MSSQL databases into a modular, cloud-native Azure architecture while continuing to support and enhance legacy user interfaces and services.

Main Responsibilities:

The FullStack Engineer will be responsible for various tasks, focusing on both backend and frontend development.

• Design and implement backend services and APIs in .NET (6/8) with clean architecture.

• Build and maintain React + TypeScript frontends and oversee 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 end-to-end.

• 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 modeling activities (DDD patterns, bounded contexts).

• Collaborate in Agile ceremonies, estimate work, and define acceptance criteria.

Key Requirements

• 5+ years of 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).

• Good Git practices and code review discipline.

• English for technical communication (B2+).

Nice to Have

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• IaC experience (Terraform, Bicep) and deployment automation.

• Docker and Kubernetes (AKS) experience.

• Experience with Playwright codegen or Cypress end-to-end automation.

• Background in migrating monoliths to modular services or microservices.

• Familiarity with SQL Server internals and performance profiling.

• Azure certifications (e.g., Azure Developer Associate).