Junior/Mid Fullstack Developer (.NET + React)

Directio Sp. z o.o. · Warsaw, Masovian Voivodeship, Poland

Information Technology & Services · 51-200 employees

2 d ago

Remote Mid (2-5 yrs) Full-time Poland

About the role

Develop and maintain fullstack web applications using .NET and React while integrating AI-enabled features and LLM-based tools. Collaborate with stakeholders to translate business requirements into scalable software solutions and AI workflows.

What they look for

C# .NET React JavaScript TypeScript REST APIs LLM RAG Prompt Engineering GitHub Copilot Azure OpenAI Semantic Kernel LangChain Vector Search Software Architecture English Communication

Requirements

Requires commercial experience with C#/.NET and React, along with a strong understanding of REST APIs and databases. Candidates should have a practical interest or experience in building AI features using LLMs and RAG frameworks.

Full 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.