Senior Full-Stack Developer, .Net, React

Sigma Software Group

Senior Full-Stack Developer designing and maintaining web solutions for a German automotive manufacturer. Collaborating with teams to deliver scalable and secure applications in cloud environments.

Posted 6/18/2026full-timeRemote • 🇵🇱 PolandSeniorWebsite

Tech Stack

Tools & technologies

ASP.NETAWSAzureCloudEntity FrameworkGoogle Cloud PlatformJavaScriptKubernetesMaterial UI.NETReactReduxTypeScript

About the role

Key responsibilities & impact

Work directly with Customer engineering and product teams to understand business needs
Take ownership of end-to-end feature delivery from technical analysis and design to implementation
Design, develop, and maintain high-quality full-stack solutions using .NET, React.js, and cloud technologies
Participate in architecture discussions and technical decision-making
Identify and recommend technical improvements and optimization opportunities
Develop scalable, reliable, and maintainable applications following engineering best practices
Work with containerized environments and Kubernetes-based deployments
Collaborate closely with distributed teams

Requirements

What you’ll need

At least 5 years of professional software development experience
Strong hands-on expertise with .NET / C# and modern web technologies
Proven background in complex business domains and large-scale enterprise applications
Solid experience with ASP.NET Core / Web API, Entity Framework Core, database design and optimization
Strong front-end skills with React.js, Redux, Material UI, TypeScript, and modern JavaScript practices
Practical experience with cloud platforms (AWS, Azure, GCP)
Knowledge of CI/CD processes, automated delivery pipelines, and code quality practices
Experience working with containerized environments and Kubernetes
Familiarity with AI-assisted development tools and practices
Good understanding of software architecture principles, design patterns, and clean code
Experience working in Agile teams
Upper-Intermediate English level or higher

Benefits

Comp & perks

Remote work format
Modern tech stack
AI-assisted development tools
Collaboration with Customer teams
Innovation and ownership culture

ATS Keywords

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Hard Skills & Tools

.NETC#ASP.NET CoreWeb APIEntity Framework CoreReact.jsReduxMaterial UITypeScriptJavaScript

Soft Skills

collaborationownershiptechnical analysisdesignproblem-solvingcommunicationdecision-makingoptimizationadaptabilityteamwork