Senior Full Stack (.NET) Developer
We are looking for a highly skilled Senior Full Stack Developer to join our team and contribute to building modern, scalable web applications. This is a long-term engagement with 100% remote work, offered on a B2B contract.
Rate: 160–180 PLN/h (B2B)
Location: Remote (100%)
Languages required: Polish – very good; English – B2/C1
What We’re Looking For
- 4+ years of professional software development experience (ideally 6+ years).
- Strong expertise in .NET Core / .NET 6+, ASP.NET Core, C#, and Web API.
- Experience developing RESTful APIs and integrations, working with SQL databases.
- Proficiency in frontend frameworks (Angular 2+, React, or Vue.js) and HTML5.
- Familiarity with unit & integration testing, clean coding practices, and Git.
- Ability to work across the stack (frontend, middleware, backend) with attention to performance and code quality.
- Comfortable using GenAI tools (e.g., Cursor, GitHub Copilot).
- Strong understanding of OOP, design principles, and patterns.
- Excellent collaboration skills with remote, distributed teams, strong ownership, and self-management.
- Good communication in Polish (very good) and English (B2/C1).
Nice-to-Have (Desired Skills)
- Experience with TDD, automated tests, Agile methodologies, pair/mob programming (XP).
- Database experience with Microsoft SQL Server, PostgreSQL, Entity Framework Core, ADO.NET.
- Frontend experience with Bootstrap, TypeScript, JavaScript, CSS3.
- Knowledge of data sources (Data Warehouses, Lakehouses).
- Experience with Power BI REST APIs.
- Hands-on experience with AI engineering, including:
- Agent frameworks/orchestration (planning, multi-agent routing, tool calling).
- Retrieval-augmented generation (RAG), embeddings, vector/hybrid search (Azure AI Search).
- Microsoft Semantic Kernel or similar .NET agent orchestration tools.
- Long-running workflows and human-in-the-loop scenarios.
- Ability to identify and proactively avoid performance issues.
Day-to-Day Responsibilities
- Hands-on development across frontend, backend, and APIs, ensuring clean and maintainable code.
- Participate in daily scrums and collaborate actively with the team.
- Deliver features based on planning, grooming, mockups, and user stories.
- Design and build scalable applications using .NET (C#/ASP.NET Core), modular monoliths, and microservices.
- Implement and optimize RAG pipelines (document ingestion, embeddings, retrieval).
- Build and expose APIs (REST/GraphQL) for internal/external integrations.
- Contribute to CI/CD pipelines, code reviews, and testing.
- Collaborate in pair/mob programming sessions when needed.
- Work closely with support teams on deployments and resolving critical issues.
If this sounds like the right challenge for you, don’t hesitate to apply! It’s a great opportunity to grow in the financial domain while exploring cutting-edge technologies.