Senior Full-Stack .NET Developer

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

About The Position

Optiveum is the recruitment partner for this role with a client that is a European Union institution based in Warsaw. The cooperation agreement will be signed directly with the contracting partner. The developer will design, develop, and support enterprise web applications built with .NET and React, from translating business requirements into technical solutions through deployment, release management, and 3rd-line production support. The role is on-site/near-site in Warsaw and is full-time at 40 hours per week. EU citizenship is required. The rate is up to 32 EUR/h net on a B2B basis.

Requirements

  • EU citizenship.
  • At least 6 years of IT experience, including at least 3 years in a similar development role.
  • Strong experience with .NET 8 / .NET Core, C#, and ASP.NET Core.
  • Experience with React and TypeScript on the front end.
  • Experience with Entity Framework and SQL Server.
  • Experience with Azure DevOps pipelines.
  • Experience with OpenShift / containers.
  • Knowledge of SAML 2.0 / Entra ID authentication.
  • Agile/Scrum experience.
  • An advanced software development certification.
  • English at least B2 and fluent Polish.

Responsibilities

  • Design, develop, and maintain enterprise web applications.
  • Build and support solutions using .NET (C#, ASP.NET Core) and React (TypeScript).
  • Translate business requirements into technical solutions.
  • Participate in testing, deployment, release management, and production support.
  • Optimize application performance, security, and quality.
  • Produce technical documentation and provide 3rd-line support.
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