Site Reliability Engineer
Senior .NET Developer with Azure - banking industry (f/m/x)
Cracow
Apply on the employer's siteRole description
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 tasks
- 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
Requirements
- 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
Nice to have
- Knowledge of observability practices
- Experience with automated testing
Job no. JOB-7CTY4
Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.
Benefits For You
- Great Place to Work
- Solid financial situation
- Contracts with the biggest brands
- Centre of internal trainings
- Many experts you can learn from
- Open and accessible management team
- Profit sharing
- Passion Sponsorship program
- Regular integration events and trips
- Comfortable and well-equipped offices
- MySii app
- Medical care
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