Senior .NET Backend Engineer — Hybrid, Enterprise-Grade

Logifuture seeks a Senior .NET Framework Backend Developer to own the full software lifecycle, building and maintaining applications, systems, databases, and infrastructure. You will drive improvements, mentor teammates, draft technical docs, and deliver robust APIs.The role emphasizes on-call rotation, staying current with technologies, and collaborating...

SimCorp is seeking a Senior Engineer to contribute to the Private Debt module, primarily working with APL today and expanding C#/.NET work over time. You will mentor peers, design backend systems and ensure quality with automated testing, CI/CD, and robust architectural patterns.Ideal candidates have strong object-oriented design skills, experience in APIs...

Enfint in Warszawa is seeking a senior software engineer to design and build enterprise applications. You will develop end-to-end backend and basic frontend features, integrate APIs, and work with cloud-based SaaS systems in a global client environment.The role requires 5+ years of enterprise software experience, strong C#/.Net, SQL, REST skills, and English...

Trinetix seeks a Senior AI Engineer to design and build production-grade AI applications and services using Python. You will turn business and AI use cases into reliable, scalable technical solutions, working with LLMs, backend services, APIs, and enterprise systems.You will contribute to architecture decisions, implement observability, and collaborate with...

Allegro.eu S.A. is seeking a Senior Software Engineer to own backend design and delivery for the Allegro One logistics services.You will work in a hybrid Warsaw-based team handling high-throughput systems using C# and .NET Core, REST APIs, and PostgreSQL, with Docker/Kubernetes in a cloud-native setup. You will lead architectural decisions, ensure...

Belvedere Recruitment is seeking a Senior AI Engineer in Warsaw to design and build scalable AI-powered tax automation solutions. You will work across the full AI lifecycle, from LLM integration to intelligent agents, with enterprise-grade deployment and governance.You will collaborate with product and data teams, implement Retrieval-Augmented Generation,...

We are looking for an experienced Senior Backend Engineer (Python/Go, AWS) with at least 5 years of commercial experience in building cloud-based backend solutions. Scope of responsibilities Design and development of the backend layer for the Voice AI platform running entirely on AWS. Implementing and maintaining APIs using AWS API Gateway and AWS Lambda,...

Jobtailor is seeking a senior .NET Backend Engineer to build and maintain scalable C#/.NET services supporting video indexing and auto-tagging of live sports events.You will own backend compute at scale, design and review code, mentor peers, and collaborate with AI/algorithm teams. The position offers hybrid work with three days in the Warsaw office and...

Belvedere Recruitment is seeking a Senior AI Engineer in Warsaw to design and scale AI-driven tax automation solutions. You will work across the full AI lifecycle, integrate LLMs and develop enterprise-grade architectures.Join a forward-thinking team in a hybrid role for a 3-month contract focused on cutting-edge AI frameworks and Retrieval-Augmented...