.NET developer in backend systems

Onwelo is a technology partner that delivers comprehensive services—from strategy and architecture, through implementation, to maintenance—in the areas of digital transformation, data, and automation. Our team consists of over 400 specialists with strong senior-level expertise, and we have completed more than 300 projects for large organizations in Poland, Europe, and the USA. We operate in several Polish cities and have offices in Germany, Switzerland, and the USA, combining a local presence with a global reach.

• Designing, implementing, and developing backend applications using .NET (C#)
• Creating and maintaining microservices and APIs (REST, gRPC), and integrating them with external systems
• Working with databases, optimizing queries, and performing schema migrations
• Implementing cloud solutions and using containerization (Docker, Kubernetes)
• Ensuring code quality through regular participation in code reviews, writing tests (unit and integration), and collaborating on CI/CD automation
• Diagnosing and resolving production issues, and participating in application monitoring and maintenance

• At least 4 years of commercial experience in software development using .NET (C#)
• Good knowledge of microservices architecture and design patterns used in web applications
• Ability to use Docker and Kubernetes tools efficiently
• Practical knowledge of cloud solutions
• English proficiency at a minimum B2 level—a mandatory requirement
• Knowledge of tools for creating/managing APIs and testing services (e.g. Postman)
• Ability to write unit and integration tests
• Будет плюсом: Openness to working with Angular or React; Experience in banking projects

• Possibility of hybrid work (3 days from the client's office in Warsaw)
• Participation in interesting projects for global clients
• As many as 80% of promotions in our company happen internally
• 90% of the management team has a technical education
• Access to internal training and development paths
• Participation in team events, company meetings, and Town Halls
• Access to life insurance and private medical care for yourself and your family
• MultiSport card to support your health and fitness