At Mindbox we connect top IT talents with technology projects for leading enterprises across Europe.
Join our client’s team as a FullStack Engineer!
Are you ready to work on modernizing enterprise applications and delivering scalable solutions in a cloud-native environment? We are looking for an experienced FullStack Engineer to help transition a portfolio of .NET and MSSQL applications to a modern Azure-based architecture, while continuing to enhance and maintain legacy applications.
Sounds like your kind of challenge?
LI- Hybrid – 6 days per month from the office in Kraków
What you’ll be doing
- Design and implement backend services and REST APIs using .NET 6/8 with clean architecture principles.
- Develop and maintain React + TypeScript frontends and support incremental migration from legacy UIs.
- Refactor and extract business logic from legacy .NET (including ASP.NET MVC, WPF, WinForms) and T-SQL stored procedures.
- Build and maintain unit, integration, contract, and end-to-end tests using tools like xUnit, Jest, and Playwright/Cypress.
- Implement and support CI/CD pipelines (Azure DevOps or GitHub Actions) and Infrastructure as Code (IaC).
- Extend application observability (metrics, logging, distributed tracing) and configure alerting for production stability.
- Troubleshoot production incidents and provide fixes that maintain uptime and security standards.
- Contribute to domain modeling and architectural decisions using DDD principles.
- Participate in Agile/Scrum ceremonies, provide accurate estimations, and define acceptance criteria.
Note: Detailed project information will be shared during the recruitment process.
What you get in return
- Flexible cooperation model – choose the form that suits you best
(B2B, employment contract, etc.) - Hybrid work setup – 6 days per month from the office in Kraków
- Collaborative team culture – work alongside experienced professionals eager to share knowledge
- Continuous development – access to training platforms and growth opportunities
- Comprehensive benefits – including Interpolska Health Care, Multisport card, Warta Insurance, and more
- High quality equipment – laptop and essential software provided
Who we’re looking for
- Minimum 5 years of commercial experience in software development.
- Strong hands-on experience in C# and .NET (Framework and .NET Core / .NET 6+).
- Advanced knowledge of Entity Framework Core and MSSQL, including performance tuning.
- Practical expertise in React and TypeScript for building responsive frontends.
- Proven experience building and securing REST APIs (authentication, validation, and versioning).
- Familiarity with Azure services (App Service, Functions, Azure SQL, Service Bus, Storage).
- Experience implementing CI/CD pipelines and automated testing strategies.
- Knowledge in observability tools (Application Insights, OpenTelemetry).
- Ability to work with legacy code and collaborate effectively in Agile teams.
- English proficiency for technical communication (B2+).
Nice to Have
- IaC experience with Terraform or Bicep.
- Knowledge of Docker and Kubernetes (AKS) for containerized deployments.
- Hands-on experience with Playwright or Cypress e2e test automation.
- Background in monolith to microservices migration.
- Familiarity with SQL Server internals, performance profiling, and Azure certifications.
Joining this project you’ll become part of Mindbox – a tech-driven company where consulting, engineering, and talent meet to build meaningful digital solutions. We’ll back you up every step of the way, accelerate your development, and ensure your skills make a difference.
I will handle your recruitment
Karolina Cieślik
