Senior .NET Developer - Azure Cloud Modernization

Sii Poland; Kraków; Híbrido; PLN 180 000 - 230 000; Tempo integral

Vantagens oferecidas por esta oferta de emprego

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

Resumo da oferta

Sii Poland in Kraków is seeking a versatile Senior .NET Developer to join our modernization program, migrating legacy applications to cloud-native Azure. You will work across backend, frontend, database, and cloud/DevOps, developing .NET APIs, React microfrontends, and Azure services.

The role is based in Cracow with a hybrid work model. You will design backend services, build React microfrontends, manage MSSQL/Azure SQL, Terraform IaC, and CI/CD pipelines in Azure DevOps, while ensuring

Qualificações

• 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

Responsabilidades

• 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.

Conhecimentos

C# / .NET

ASP.NET Core

EF Core

Azure

Terraform

Azure DevOps

REST APIs

TypeScript

React

Git

Ferramentas

Terraform

Azure DevOps

SQL Server / MSSQL

CI/CD pipelines

Descrição da oferta de emprego

Sii Poland in Kraków is seeking a versatile Senior .NET Developer to join our modernization program, migrating legacy applications to cloud-native Azure. You will work across backend, frontend, database, and cloud/DevOps, developing .NET APIs, React microfrontends, and Azure services.

The role is based in Cracow with a hybrid work model. You will design backend services, build React microfrontends, manage MSSQL/Azure SQL, Terraform IaC, and CI/CD pipelines in Azure DevOps, while ensuring