Senior .NET Developer with Azure - banking industry (f/m/x)

Expected, C#, TypeScript, AzureDevOps, .NET, Microsoft Azure, React.js, Terraform, Module Federation, Azure SQL DBs, Microsoft SQL Server, Databricks

Optional, Observability, Automated Testing

About the project, We are looking for a versatile Senior .NET Developer to join the modernization program, migrating a portfolio of legacy applications to a cloud-native Azure architecture. In this role, you will work on a variety of tasks across backend, frontend, database, and cloud/DevOps, contributing to the development of .NET APIs, React microfrontends, and Azure services. This position is based in Cracow and offers a hybrid work model. If you are passionate about modernizing applications and enjoy working in a collaborative environment, this opportunity may be the right fit for you.

Your responsibilities, Designing and implementing backend services and REST APIs in .NET 9 using Clean Architecture, Building and maintaining React + TypeScript microfrontends, Evolving MSSQL / Azure SQL schemas, Authoring and maintaining Infrastructure as Code in Terraform for Azure resource management, Building, optimizing, and supporting CI/CD pipelines in Azure DevOps, Integrating Azure AD authentication and applying security best practices, Instrumenting services for observability and health checks, Reading, refactoring, and extracting business logic from legacy .NET and T-SQL during migration, Writing and maintaining automated tests including unit, integration, and E2E tests, Troubleshooting production incidents and supporting deployments

Minimum 5 years of commercial full-stack experience with C# /.NET (including .NET 6+/9) and ASP.NET Core, Strong skills in EF Core and MSSQL / Azure SQL, including query tuning and stored procedures, Hands-on experience with Azure services such as App Service, Azure SQL, and Functions, Proficiency in Infrastructure as Code using Terraform for multi-environment provisioning, Experience with CI/CD processes in Azure DevOps, including YAML pipelines-as-code, Practical knowledge of building and securing REST APIs with validation and authentication, Experience with automated testing frameworks like xUnit and Jest / Vitest, Familiarity with observability tools such as Application Insights and structured logging, Good Git practices and code review discipline, Advanced level of English

Optional, Knowledge of observability practices, Experience with automated testing

What we offer, Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas, Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market, We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022, Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more, Comfortable workplace – class A offices or remote work, Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application, PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers, Investment in your growth – meetups, webinars, training platform and technology blog – you choose, Fantastic atmosphere created by all Sii Power People

This is how we work on a project, Continuous Deployment, Continuous Integration

Recruitment stages, Send your CV, Talk to us about your expectations, Learn more about our projects and choose the best, Start your adventure with Sii!

Sii Sp. z o.o., Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment., , Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.

This is how we work,