Senior FullStack Engineer (.NET / Azure / React)

We are seeking a highly skilled Senior FullStack Engineer with expertise in .NET, Azure, and React. The successful candidate will join our team in evolving our portfolio of .NET applications and MSSQL databases to a modular, cloud-native architecture while enhancing legacy systems.

What we offer:

• Long Term Cooperation

• Rate: 160-180 pln/h + VAT

• B2B Contract

• 5 days per month in office Krakow

Main Responsibilities:

• Lead architecture decisions and migration strategies.

• Create and maintain architectural decision records (ADRs) and API guidelines.

• Implement hands-on coding and conduct code reviews for core services.

• Mentor team engineers and formalize best practices.

• Design CI/CD automation solutions and self-service tooling.

• Ensure system reliability through observability and pattern implementation.

• Oversee data integrations and SQL Server performance strategies.

• Manage technical risks and prioritize technical debt.

• Collaborate with stakeholders to shape the development roadmap.

Key Requirements:

• 8+ years of commercial experience in Senior/Tech Lead/Full-Stack roles.

• Expertise in C#/.NET, with solid backend design skills.

• Proven Azure architecture experience.

• Advanced SQL Server skills including performance tuning.

• Strong React and good Angular experience.

• Experience with modernizing legacy UIs.

• Understanding of ETL processes and reporting tools.

• CI/CD and automation practice proficiency.

• English proficiency (B2/C1 level) for communication and documentation.

Nice to Have:

• Operational experience with Kubernetes (AKS).

• Advanced use of Terraform.

• Familiarity with Databricks and Spark SQL.

• Experience with event streaming technologies.

• Performance tooling and chaos engineering experience.

• Understanding of security best practices in software design.

Other Details: This is a contract position with a hybrid work model (5 days in the office per month) based in Kraków. Working hours are from 09:00 to 17:00 CET.