FullStack Engineer (.NET & React & Azure)

Senior Full-Stack Engineer (.NET / React / Azure / Terraform)

About the role

We are looking for a Senior Full-Stack Engineer to join a large-scale modernization programme focused on migrating a portfolio of legacy applications and databases to a modular, cloud-native architecture on Microsoft Azure. You will work across backend, frontend, database and cloud/DevOps areas, contributing directly to production solutions and supporting the incremental transformation of business-critical systems.

Your responsibilities

• Design and implement backend services and REST APIs in .NET 9 using Clean Architecture.
• Build and maintain React and TypeScript microfrontends integrated through module federation.
• Develop and optimize MSSQL and Azure SQL schemas, stored procedures, views and EF Core queries.
• Create and maintain Terraform code for provisioning Azure resources across environments.
• Build, optimize and support Azure DevOps CI/CD pipelines using YAML.
• Integrate Entra ID / MSAL authentication and apply security best practices, including Key Vault and least-privilege access.
• Implement observability with Application Insights, structured logging, health checks and alerting.
• Refactor legacy .NET and T-SQL solutions and extract business logic during migration.
• Create and maintain unit, integration, API and end-to-end automated tests.
• Troubleshoot production incidents, deliver fixes and support deployments.
• Collaborate in Agile ceremonies, estimate work, define acceptance criteria and participate in code reviews.

Required skills and experience

• At least 5 years of commercial full-stack development experience with C# and .NET, including .NET 6+ and ASP.NET Core.
• Strong knowledge of EF Core and MSSQL / Azure SQL, including query tuning, indexing, transactions and stored procedures.
• Hands-on experience with Azure services such as App Service, Azure SQL, Storage, Key Vault, Functions and Service Bus.
• Practical experience with Infrastructure as Code using Terraform, including modules, state management and multi-environment provisioning.
• Experience with Azure DevOps CI/CD and YAML pipelines.
• Experience building and securing REST APIs, including validation, versioning, OAuth, JWT and Entra ID.
• Experience with automated testing tools such as xUnit, Jest, Vitest or Playwright.
• Knowledge of Application Insights, OpenTelemetry and structured logging.
• Good Git practices and code review discipline.
• English at B2 level or higher for technical communication.

Nice to have

• Production experience with React and TypeScript.
• Experience with Azure Data Factory, Databricks, Spark, Power BI or SSRS.
• Knowledge of microfrontends and module federation.
• Experience with Docker and Kubernetes / AKS.
• Knowledge of Bicep or ARM templates.
• Experience with event-driven integration using Service Bus or Event Hubs.
• Experience modernizing legacy technologies such as ASP.NET MVC, Razor, WPF, WinForms, Windows Services or SSIS.
• Azure certifications such as AZ-204, AZ-400 or AZ-104, or HashiCorp Terraform Associate.

What we offer

• Hybrid work in Kraków, with 6 days per month in the office.
• B2B contract
• Rate : 160 -185 PLN netto/hour
• Benefits: Luxmed, Multisport Card

Why apply for an Antal job offer?

When your application is successful, you will be supported by a dedicated Consultant who will stay in regular contact with you (via email or phone), help you prepare for interviews with your future employer, and ensure a smooth and professional recruitment process.

About Antal

Antal is a leading recruitment and HR advisory company, present in Poland since 1996 and later expanded to the Czech Republic and Hungary. Across the CEE region, we employ around 150 professionals who deliver a full range of services - from specialist and executive recruitment, employee outsourcing and HR consulting, to employer branding and market research.

Our division-based structure combines deep industry expertise with functional specialisation, enabling us to provide tailored solutions for companies in every sector. We act as a trusted partner for both employers and candidates, sharing our knowledge and guiding them through every stage of the talent journey. We connect exceptional people with the right opportunities and help organisations build successful team