.Net Developer
Primary stack
Nice to have's
Job description
About the Position
#.Net Developer
About Onwelo
Onwelo is a technology partner providing comprehensive services-from strategy and architecture to implementation and maintenance-in the areas of digital transformation, data, and automation. Our team comprises over 400 specialists with strong senior competencies and more than 300 completed projects for large organizations in Poland, Europe, and the USA. We operate from several Polish cities and offices in Germany, Switzerland, and the USA, combining local presence with a global reach.
About the Project
At Onwelo, we continuously develop engineering teams and respond dynamically to the needs of our partners. We are looking for .NET developers to strengthen our projects where competency gaps currently exist or new project phases are starting.
By undergoing a single recruitment process with us, your skills are mapped to the current needs of various teams. We implement projects for clients in industries such as automotive, healthcare, finance, and media & digital marketing, as well as develop our own products. After technical verification, we match your profile to projects where your experience will bring the greatest value and address real business challenges for the client.
Responsibilities
- Design, implementation, and development of backend applications in.NET (C#) – from architecture to ready code.
- Creation and maintenance of microservices and API (REST, gRPC) and their integration with external systems.
- Working with databases (relational and NoSQL), ensuring query optimization and schema migrations.
- Implementing cloud solutions and using containerization (Docker, Kubernetes).
- Ensuring code quality through regular participation in code review, writing tests (unit, integration), and collaborating on CI/CD automation.
- Diagnosing and solving production issues and participating in application monitoring and maintenance.
- Optionally (depending on the project): Collaborating on tasks requiring frontend support (Angular/React).
Requirements
- Minimum 3 years of experience in commercial software development in .NET (C#) and ASP.NET Core.
- Good knowledge of microservices architecture and design patterns used in web applications.
- Proficiency in using Docker and Kubernetes.
- Practical knowledge of cloud solutions – our preferred standard is AWS, but knowledge of Azure or GCP is also an advantage.
- English language proficiency at least at B2 level – necessary for daily communication in international projects (USA/Europe).
- Knowledge of tools for creating/managing APIs (Swagger/OpenAPI) and testing services (e.g., Postman).
- Ability to write unit and integration tests.
- Nice to have: Commercial experience or openness to working with frameworks Angular or React.
We Offer
- Flexible hours and the possibility of hybrid or remote work
- Participation in interesting projects for global clients
- Up to 80% of promotions in our company occur internally
- 90% of the management staff have technical education
- Access to internal training and development paths
- Participation in team events, company meetings, and Town Halls
- Support in building a professional image (personal branding)
- Access to life insurance and private medical care for you and your family
- MultiSport card, which supports health and fitness
Department: Software Development
Locations: Poland
Work Mode: Remote
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Financial Services,Healthcare,Manufacturing,ICT Platforms
About the Company Onwelo is a Polish technology company that supports organizations in building growth and efficiency through digital transformation, data analytics, and automation. The company provides end-to-end services from strategy and implementation to ongoing support. Onwelo believes technology can either slow organizations down or make them stronger and more adaptable. They design, build, and secure systems that support growth, taking full ownership of outcomes from strategy to production. The company has over 10 years of experience and more than 400 experts. Products, Services & Tech Stack Core Solutions Strategic Technology Consulting: Helping clients decide where to invest in technology and where to cut costs. Focuses on cloud strategy and system architecture that move the business forward. Intelligent Automation (RPA): Automating repetitive tasks that waste team time and create errors, allowing people to focus on decisions that matter. AI & Data Analytics: Turning data into actionable decisions, built for regulated industries where accuracy and compliance are critical. Cybersecurity: Designing systems that pass audits and protect assets, with compliance built in from the start. Technologies & Frameworks AI & ML: Predicting outcomes. Data Analytics: Driving insights. Automation: Reducing manual work. Cloud: Scaling infrastructure. Cybersecurity: Protecting assets. IoT: Connecting devices. QA: Ensuring quality. FinOps: Optimizing costs. Project Scope & Target Clients Client Base Financial Services: Supporting enterprise teams with data workflows, automation, and analytics that reduce manual load and improve operational oversight. Healthcare: Consolidating reporting and enabling near real-time visibility for production and planning teams. Manufacturing: Combining computer vision and analytics to support stable improvement over time. ICT Platforms: Delivering cloud migrations, data platforms, and managed services with governance and reliability designed for long-term operations. Engineering Scale Onwelo takes responsibility for results, timelines, and operational readiness, not only the delivery scope. They embed security, compliance, and audit requirements into architecture, delivery, and operations from day one. The company offers end-to-end ownership from strategy and architecture to deployment and managed services, providing one accountable partner across the lifecycle.
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