Junior/Mid Fullstack Developer (.NET + React)
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Junior/Mid Fullstack Developer (.NET + React)
Location
Warsaw
Experience
Mid
Posted
Jul 11, 2026
Apply by
August 10, 2026
Applicants
0
Early applicantEasy applyFull-timeWork from Home
Job Description
Responsibilities
- As a Junior/Mid Fullstack Developer, you will be developing and maintaining web applications using .NET/C# on the backend and React on the frontend;
- You will be implementing new application features, APIs, UI components, and integrations, ensuring clean and maintainable code;
- You will be supporting the development of AI-enabled features, such as assistants, document-based Q&A, summaries, analysis, or workflow automation;
- You will be working with LLM-based tools and APIs, helping integrate AI capabilities into business applications;
- You will be supporting simple RAG or knowledge-based solutions, where AI generates answers based on provided documents, data, or context;
- You will be helping create reusable AI workflows, prompts, or “skills” for repeatable business tasks;
- You will be collaborating with developers, product stakeholders, and business users to translate requirements into working software solutions;
- You will be testing, validating, and improving application features, including AI-generated outputs where relevant;
- You will be using modern development tools, including AI-assisted tools, to support coding, debugging, documentation, and research.
Requirements
- Commercial or strong project experience with C#/.NET, enabling backend development of business applications;
- Experience with React and JavaScript or TypeScript, enabling development of modern frontend interfaces;
- Good understanding of REST APIs, databases, application integrations, and basic software architecture;
- Practical interest or initial experience in building AI-enabled application features using LLMs or similar tools;
- Basic understanding of RAG, AI-in-the-loop, prompts, and the use of external knowledge or documents in AI-based features;
- Awareness of common AI-related risks, such as hallucinations, data privacy, security, and the need to validate AI-generated outputs;
- Experience using AI tools in the software development process, such as GitHub Copilot, ChatGPT, Claude, Cursor, or similar tools;
- Willingness to learn, experiment, and work with new AI-related technologies and approaches;
- Strong communication skills, enabling effective collaboration with technical and non-technical stakeholders;
- Good command of English, enabling clear communication in an international environment.
Nice to have
- Experience with OpenAI, Azure OpenAI, Claude, Semantic Kernel, LangChain, or similar tools;
- Experience with vector search, knowledge-base search, document processing, or AI assistants;
- Experience building chatbots, document Q&A tools, automation workflows, or AI-supported business features;
- Own AI-related project, demo, GitHub repository, or portfolio showing practical use of AI in software development.
Key Responsibilities
- Develop and maintain web applications using .NET/C# backend and React frontend
- Implement new application features, APIs, UI components, and integrations
- Support development of AI-enabled features such as assistants and workflow automation
- Work with LLM-based tools and APIs to integrate AI capabilities
- Support RAG or knowledge-based solutions for AI-generated answers
- Create reusable AI workflows, prompts, or skills for business tasks
- Collaborate with developers, stakeholders, and business users to translate requirements
- Test, validate, and improve application features including AI-generated outputs
- Use modern development tools and AI-assisted tools for coding and debugging
Skills Required
C#.NETReactJavaScriptTypeScriptREST APIsDatabasesLLMsRAGGitHub CopilotChatGPTClaudeCursorCommunicationCollaborationWillingness to learnExperimentationOpenAIAzure OpenAISemantic KernelLangChainVector searchKnowledge-base searchDocument processingAI assistantsChatbotsAutomation workflows
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