Senior Full Stack Developer(Python and React)

Project Overview
We are supporting the development and ongoing evolution of a growing e-commerce and multichannel sales platform operating across multiple European marketplaces.
The platform manages product listings, integrations with external sales channels, logistics partners, and post-transaction workflows. The system is already live, well-structured, documented, and production-ready. The focus is now on maintenance, integrations, and gradual feature expansion.
This is not a greenfield project — you will work with an existing, clean codebase originally built by an experienced engineering team.

Requirements:
- Python experience: 5+ years;
- React experience: 2 years;
- Next experience: any;
Tech Stack
Frontend:
- Framework: Next.js (App Router), React
- Hosting: Vercel
- Language: JavaScript (mainly), TypeScript (partially)
- UI: Tailwind CSS, HeroUI (NextUI)
- Auth: NextAuth.js
- Data Fetching: REST APIs (Axios)
Backend:
- Language: Python 3.9+
- Database: PostgreSQL (optional), SQLite (default)
- Caching: Redis (optional), in-memory cache
- Version Control: Git

Responsibilities:
- Maintain and extend an existing production-grade web platform;
- Develop and improve backend services in Python;
- Build and refine frontend features using React and Next.js;
- Integrate new third-party services and external marketplaces via REST APIs;
- Work with authentication, data flows, and business logic across the stack;
- Ensure code quality, readability, and maintainability;
- Collaborate directly with business stakeholders and technical consultants.

Working conditions:
- Paid vacation (15 business days per year);
- Flexible working hours (8 hours a day);
- Paid workshops, conferences, courses.