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Urgent! Senior Full Stack Developer Job Opening In Warsaw – Now Hiring Greenminds

Senior Full Stack Developer



Job description

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.


Required Skill Profession

Computer Occupations



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