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Offer summary
(Summary generated by AI based on the full job description)
Project focuses on modernizing a portfolio of legacy applications and migrating to a cloud-native Azure architecture. Main technologies are .NET 9 / .NET 6+, ASP.NET Core, EF Core, MSSQL / Azure SQL, React + TypeScript, Terraform and Azure DevOps. Responsibilities include designing and implementing backend and REST APIs, developing microfrontends, evolving database schemas, IaC for Azure, building and optimizing CI/CD, Azure AD integration, observability instrumentation, refactoring legacy .NET/T-SQL business logic, writing automated tests and supporting production.
Senior .NET Developer with Azure - banking industry (f/m/x)
Company: Sii Sp. z o.o.
from: 2 October 2026
to: 1 November 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:senior
working mode:hybrid • full office
Kraków, Podgórze
Requirements
Expected technologies
C#
TypeScript
AzureDevOps
.NET
CI/CD
Microsoft Azure
Power BI
React.js
Terraform
Module Federation
Azure SQL DBs
Microsoft SQL Server
Databricks
Optional technologies
Observability
Automated Testing
Our 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
Optional
- Knowledge of observability practices
- Experience with automated testing
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
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.
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
Recruitment stages
- 1.Send your CV
- 2.Talk to us about your expectations
- 3.Learn more about our projects and choose the best
- 4.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
Senior .NET Developer with Azure - banking industry (f/m/x)
I apply to:
Sii Sp. z o.o.
Kraków, Podgórze
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