Senior .NET Fullstack Developer

OPTIVEUM sp. z o.o. • Capon Bridge, WV

4d • €36 • Remote

About The Position

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.

Requirements

• 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.

Responsibilities

• 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 This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed