Senior .NET Fullstack Developer

OpenKrill; United States; Sur place; USD 46 000 - 56 000; Plein temps

Résumé du poste

Optiveum is recruiting a Senior .NET Fullstack Developer to join the team of our client, a global, research-driven organization. This is a 100% remote, full-time role based in Poland (Warsaw) with a 40-hour week.

You will develop, modernize and maintain full-stack applications using C#/.NET, work across UI, backend, APIs and data sources, and establish Azure infrastructure and CI/CD pipelines (GitHub Actions).

Qualifications

• Senior-level experience in full-stack software development.
• Hands-on C#/.NET expertise, including migrating legacy apps.
• Experience with Oracle, SQL and data integration.
• Proficiency with Azure cloud services and CI/CD pipelines (GitHub Actions preferred).
• Knowledge of APIs, security, testing and deployment.

Responsabilités

• Develop, maintain and improve business-critical full-stack applications.
• Modernize legacy applications and migrate solutions to newer .NET versions.
• Work across UI, backend, APIs and data sources.
• Design and implement functionalities for research entities.
• Establish and improve Azure infrastructure.
• Create and maintain CI/CD pipelines using GitHub Actions.
• Improve engineering quality with automated testing, reviews and security.

Connaissances

C#

.NET

Full-stack development

English proficiency

Outils

Azure

GitHub Actions

Oracle

SQL

APIs

Description du poste

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)
• 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.