Senior Full-Stack Engineer: Python, FastAPI, React + GenAI

your Jared; Łódź; Hybrid; PLN 180,000 - 300,000; Full time

Benefits offered by this job

Health insurance

Multisport card

Shopping vouchers

Employee stock purchase plan

Job summary

your Jared is seeking a Senior Full-Stack Developer to build a new product using Python and FastAPI for the backend, React/TypeScript for the frontend, and PostgreSQL/OpenSearch for data management. The role spans cloud-native architecture in a fast-paced startup environment.

Responsibilities include API design, performance optimization, and collaborating with the team to own features end-to-end. Experience with GenAI tools and strong communication are required.

Qualifications

• 5+ years of hands-on production experience with Python, FastAPI, and SQL.
• Strong expertise in web application development, API design, and integrations.
• Experience managing high-load databases and optimizing query performance.
• Some front-end experience with TypeScript and React, plus openness to full-stack work.
• Experience using GenAI engineering tools; Claude Code preferred.

Responsibilities

• Build and maintain web applications with Python/FastAPI and SQL.
• Design APIs and integrations for high-load database operations.
• Improve query performance across production systems.
• Support front-end development with TypeScript and React.
• Use GenAI tools to boost development workflows.
• Collaborate with the team and take ownership of features.

Skills

Python

FastAPI

SQL

API design

TypeScript

React

GenAI tooling

OpenSearch

Databricks

PostgreSQL

Cloud platforms

Tools

PostgreSQL

OpenSearch

Databricks

Claude Code

Job description

your Jared is seeking a Senior Full-Stack Developer to build a new product using Python and FastAPI for the backend, React/TypeScript for the frontend, and PostgreSQL/OpenSearch for data management. The role spans cloud-native architecture in a fast-paced startup environment.

Responsibilities include API design, performance optimization, and collaborating with the team to own features end-to-end. Experience with GenAI tools and strong communication are required.