Senior .NET Backend Engineer

Senior .NET Backend Engineer Build reliable .NET and C# backend services for scientific workflows in a fully remote Poland role. Use Azure, MS SQL and modern engineering practices at up to €35/h B2B. Senior .NET Backend Engineer Location: 100% Remote (Poland) Rate: Up to 35 EUR/h (B2B) Mode of work: 100% Remote About the role: We are looking for a Senior, backend-focused .NET Engineer based in Poland to join our international client's team. You will work closely with technical colleagues and stakeholders to develop and maintain backend capabilities that support specialized, scientific workflow management systems. Please note: Optiveum acts as the recruitment and contracting party for this role. You will sign a B2B cooperation agreement directly with us. What you will be doing: Develop and maintain backend services and APIs using .NET and C#. Design and implement reliable data access and persistence solutions using MS SQL. Contribute to a secure and maintainable application architecture. Collaborate with product, frontend, and domain colleagues to translate user needs into effective technical solutions. Support engineering quality through testing, code reviews, troubleshooting, and continuous improvement. Contribute to delivery and deployment practices within the Azure ecosystem. What we are looking for: Strong, hands-on experience with .NET and C# . Solid MS SQL skills, including working with relational data models and queries. Experience in developing or operating solutions in Microsoft Azure . Fluent English (B2B/international environment). Nice to have: Experience with Microsoft Entra ID (Azure Active Directory). Experience with GitHub pipelines and CI/CD practices. Experience with Vue 3 (frontend experience is not essential but will be considered a strong advantage). Specjalizacja / specialism IT Role Data Engineer Locations Warsaw Remote status Fully Remote About OPTIVEUM sp. z o.o. Optiveum is a recruitment and consulting company created based on our 20-plus years of experience in HR & IT services. We work for Clients located in Poland and abroad providing our local and international Candidates with Project-based or Permanent job opportunities in a remote or office-based model. COMPANY DATA Optiveum Sp. z o.o. ul. Tomasza Zana 43 lok. 2.1 20-601 Lublin, Poland nr KRS: 0000834436, NIP 7010975729 Contact us at: info (at) optiveum.com Founded in 2020 Applicant tracking system by Teamtailor