Full-stack Developer (React / Next.js / Python) - Mid/Senior

Hiberus; Polska; Hybrid; PLN 169,000 - 234,000; Full time

Job summary

Hiberus is seeking a Full-Stack Developer to join a team building a modern SaaS product powered by AI, LLMs, and large datasets. The role requires strong TS/React/Next.js and Python skills to develop web applications and APIs, with responsibilities spanning frontend to backend, integrations, and data analytics.

Experience with REST/OpenAPI, SQL/ORMs, and Git is essential. Nice-to-have items include LLMs/GenAI, Redis, Docker, FastAPI/Flask, Vercel, and SaaS/martech exposure.

Qualifications

• 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.

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.

Skills

TypeScript

React

Next.js

Python

REST APIs

SQL

ORMs

Git

Async processing

Tools

PostgreSQL

SQL

ORMs

Git

Redis

Docker

FastAPI/Flask

Vercel

Job description

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.