Senior .NET Developer — Cloud-Native Modernization (Azure)

Sii Poland

Kraków

Hybrid

PLN 180,000 - 240,000

Full time

16 hours ago
Be an early applicant
Application generator

Don’t send a generic resume — generate a resume and cover letter tailored to this exact role.

Get past ATS filters

Benefits offered by this job

Great Place to Work
Centre of internal trainings
Profit sharing
Medical care
Open management team
Trips and integration events
MySii app
Flexible work hours

Job summary

Sii Poland is seeking a versatile Senior .NET Developer to join a modernization program in Kraków. You will migrate legacy applications to a cloud-native Azure architecture, building .NET APIs, React microfrontends, and Azure services in a hybrid work setting.

Responsibilities include backend and frontend development, database tuning, IaC with Terraform, CI/CD in Azure DevOps, and implementing secure authentication with Azure AD. Strong English communications are required.

Qualifications

  • Minimum 5 years of commercial full-stack .NET experience (C#, ASP.NET Core).
  • Strong EF Core and MSSQL/Azure SQL with query tuning skills.
  • Hands-on Azure (App Service, SQL, Functions) and Terraform IaC.
  • Experience with Azure DevOps YAML pipelines and CI/CD workflows.
  • Proficient in building secure REST APIs and modern frontend with React/TypeScript.
  • Experience in automated tests (xUnit/Jest) and observability tools.

Responsibilities

  • Design and implement backend services and REST APIs in .NET 9 using Clean Architecture.
  • Develop React + TypeScript microfrontends and integrate with APIs.
  • Evolve MSSQL / Azure SQL schemas and performance tuning.
  • Author/maintain Terraform IaC for Azure resources.
  • Build and optimize CI/CD pipelines in Azure DevOps.
  • Implement Azure AD auth and security best practices.
  • Instrument services for observability and health checks.
  • Refactor legacy .NET/T-SQL during migration.
  • Write/maintain automated tests (unit, integration, E2E).
  • Troubleshoot production incidents and support deployments.

Skills

C# / .NET
ASP.NET Core
EF Core
Azure
React
TypeScript
MSSQL / Azure SQL
Terraform
Azure DevOps
REST APIs
CI/CD pipelines
xUnit / Jest
Observability
Git

Tools

Azure DevOps
Terraform
Jest
Kubernetes

Job description

Sii Poland is seeking a versatile Senior .NET Developer to join a modernization program in Kraków. You will migrate legacy applications to a cloud-native Azure architecture, building .NET APIs, React microfrontends, and Azure services in a hybrid work setting.

Responsibilities include backend and frontend development, database tuning, IaC with Terraform, CI/CD in Azure DevOps, and implementing secure authentication with Azure AD. Strong English communications are required.

Get your free, confidential resume review.

or drag and drop your file here.

Similar jobs

Similar jobs worth comparing

Senior .NET Consultant – Azure Cloud-Native Modernization (Hybrid Kraków)
Senior .NET Consultant – Azure Cloud-Native Modernization (Hybrid Kraków)

GFT Technologies SE • Kraków

Hybrid
PLN 172,000 - 220,000
Senior .NET Developer with Azure - banking industry (f/m/x)
Senior .NET Developer with Azure - banking industry (f/m/x)

Sii Poland • Kraków

Hybrid
PLN 180,000 - 240,000
Great Place to Work
Centre of internal trainings
Profit sharing
+5
Senior .Net Consultant with React and Azure (Kraków, PL, 30-302)
Senior .Net Consultant with React and Azure (Kraków, PL, 30-302)

GFT Technologies SE • Kraków

Hybrid
PLN 172,000 - 220,000
Senior .NET Developer for Cloud‑Driven Data Platform
Senior .NET Developer for Cloud‑Driven Data Platform

Sii Poland • Szczecin

On-site
PLN 180,000 - 240,000
Great Place to Work
Centre of internal trainings
Profit sharing
+2
Senior .NET & Azure Cloud Engineer - Hybrid (Kraków)
Senior .NET & Azure Cloud Engineer - Hybrid (Kraków)

GFT TECHNOLOGIES SE • Kraków

Hybrid
PLN 214,000 - 282,000
Senior .NET Developer – Cloud, CI/CD & Frontend
Senior .NET Developer – Cloud, CI/CD & Frontend

Transition Technologies PSC • Poland

On-site
PLN 133,920 - 178,560
Senior .NET Back-End Engineer – Azure, AI & Remote
Senior .NET Back-End Engineer – Azure, AI & Remote

4904 Avanade Poland sp.z.o.o. Company • Wrocław

Hybrid
PLN 120,000 - 180,000
.NET Developer - Cloud-Native Solutions
.NET Developer - Cloud-Native Solutions

BELVEDERE • Kraków

On-site
PLN 180,000 - 320,000
Senior .NET Engineer (Full-Stack, Front-End, Cloud)
Senior .NET Engineer (Full-Stack, Front-End, Cloud)

EPAM Systems • Poland

Hybrid
PLN 180,000 - 240,000
Senior .NET Developer | AWS & React Innovator
Senior .NET Developer | AWS & React Innovator

Sii Ukraine LLC • Polska

Hybrid
PLN 150,000 - 210,000