Senior .NET Fullstack Developer
At OPTIVEUM sp. z o.o. · Warsaw; Warsaw, Poland
- Engineering
- Senior
Where you can work from
Open to Poland
“Warsaw”
From the location.
“Warsaw, Poland”
From the job board field.
“Location: 100% Remote (Based in Poland / Warsaw)”
From the job description.
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- Posted
- 5 October 2026
- First seen by us
- 15 October 2026
- Last checked
- 28 hours ago
Job description
From OPTIVEUM sp. z o.o.’s job post, as they wrote it.
Senior .NET Fullstack Developer
About the role:
We are Optiveum, and we are currently looking for a Senior .NET Fullstack Developer to join the team of our client—a global, research-driven organization. In this setup, Optiveum acts as the recruitment and contracting party, meaning you will sign the B2B cooperation agreement directly with us.
Key Details:
* Location: 100% Remote (Based in Poland / Warsaw)
Read the full description
* Rate: Up to 36 EUR/h
* Mode of work: Full-time (40 hours/week)
* Language requirement: English (Fluent)
What you will be doing:
* Developing, maintaining, and improving business-critical full-stack applications.
* Modernizing legacy applications and migrating solutions to current versions of .NET.
* Working seamlessly across all application layers, including UI, backend services, APIs, and data sources.
* Designing and implementing new functionalities that support the registration of new molecules and other research entities.
* Establishing and improving Azure infrastructure for both modernized and existing applications.
* Creating and maintaining CI/CD pipelines using GitHub Actions.
* Improving engineering quality through automated testing, code reviews, secure development practices, observability, and comprehensive documentation.
* Supporting applications throughout their lifecycle, balancing maintenance, operational stability, technical debt reduction, and new development.
What we are looking for:
* Several years of senior-level professional experience in full-stack software development.
* Strong, hands-on experience with C# and .NET, including maintaining existing solutions and upgrading/migrating legacy applications to newer versions.
* Practical knowledge of Oracle databases, SQL, data access, and integration between applications and database platforms.
* Hands-on experience with Azure cloud services and CI/CD pipelines (preferably GitHub Actions).
* A broad understanding of software architecture, APIs, application security, testing, and deployment.
* A self-driven working style with the confidence to take full ownership of tasks and solutions.
* Fluent English communication skills.
Does this sound like a match? Apply today!
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