Full-stack Developer (React / Next.js / Python) - Mid/Senior
Summary
Mid/senior full-stack developer (B2B) building a modern SaaS product powered by AI/LLMs: developing React/Next.js interfaces, Python backend services and REST APIs, PostgreSQL data work, and LLM-powered features like response streaming. Requires 3+ years of commercial full-stack experience.
Form of cooperation
B2B
Remuneration
15 120 - 21 000 PLN
Type of work
Full-time
We are looking for a Full-Stack Developer to join a team working on a modern SaaS product powered by AI, LLMs, and large datasets.
Technology stack: Python 3.12, TypeScript, React, Next.js, Flask / Connexion, SQLAlchemy, PostgreSQL, SQL, OpenAI / Google Gemini, REST / OpenAPI
Key Responsibilities:
- Developing the web application and new product modules.
- Building responsive and high-performance user interfaces using React and Next.js.
- Developing APIs and backend services in Python.
- Integrating the frontend with the backend, databases, and external APIs.
- Building features powered by LLMs, including response streaming.
- Developing views for presenting data, campaigns, reports, and analytics.
- Optimizing asynchronous processes and data processing workflows.
- Designing and developing APIs based on REST and OpenAPI.
- Ensuring code quality, testing, performance, security, and robust error handling.
- Contributing to the system architecture and participating in technical and product-related decisions.
Experience required
- Minimum 3 years of commercial experience as a Full-Stack Developer.
- Strong knowledge of TypeScript, React, Next.js, and Python.
- Experience designing and integrating REST APIs.
- Knowledge of SQL, relational databases, and ORMs.
- Experience with asynchronous processes and third-party service integrations.
- Ability to build responsive and intuitive user interfaces.
- Familiarity with Git and best practices for code quality and testing.
- Ability to independently own tasks end-to-end, from frontend to backend.
- Self-motivated and proactive in proposing solutions.
Nice to have: Experience with LLMs/GenAI, OpenAI/Gemini, Redis, Docker, FastAPI/Flask, Vercel, and SaaS/martech products.
About us
Who are we?
We are a team of experienced professionals from the IT, gaming, BI, project management and business sectors. Our team consists of people who have established and developed various types of companies and have been successful in the implementation of large projects. Among us are people with over 25 years of experience in the IT industry, as well as HR specialists with extensive knowledge in the field of training, administration and management.
Work with us
Job openings
We have a wide selection of IT jobs in different sectors and locations. We focus not only on matching skills, but also support you at every stage of employment.
You can find the current recruitment processes below.
If you have a question – call or write to us. Our specialists will try to answer as soon as possible.