Senior Full-Stack Engineer — AI-Powered Platform

5Blue Software; Województwo mazowieckie; Remote; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Flexible Work Environment: Remote work

1:1 English Classes

Premium Medical Insurance

Great Team

Equipment Provided

Accounting Support

Paid Time Off: 18 days vacation + 7 S+

Flexible Payment System

Job summary

5Blue Software, an Israeli-Ukrainian software development company, seeks a Senior Full-Stack Developer to build AI-powered B2B product solutions. You will own features end-to-end across React/TypeScript frontend and Node.js backend, contributing to architecture and AI-enabled workflows.

Join an international team delivering scalable cloud services, CI/CD processes, and robust security governance tooling. Remote work options are available, with collaboration across multiple time zones and English

Qualifications

• 5+ years of professional software development experience.
• 2+ years in React with modern frontend.
• Strong practical TypeScript skills.
• Experience with Express, Fastify or similar API frameworks.
• Full-stack capabilities across frontend and backend.
• Experience with microservices architecture.
• Cloud experience with AWS/GCP/Azure.
• Experience with relational and non-relational databases (PostgreSQL, MongoDB).
• Experience integrating third-party REST APIs into production systems.
• Experience building AI-powered features in real products.
• Experience using AI-assisted coding tools.
• Able to write, understand, debug, and validate code without relying on AI.
• Knowledge of DevOps, QA, testing, and CI/CD.

Responsibilities

• Build end-to-end features using React, TypeScript, and Node.js.
• Develop scalable frontend experiences for a complex B2B product.
• Design and implement backend services, APIs, and integrations.
• Integrate AI-powered features into production environments.
• Contribute to system design and technical decisions.
• Collaborate with engineering and product teams across locations.

Skills

Node.js

React

TypeScript

Express/Fastify

AWS/GCP/Azure

PostgreSQL/MongoDB

REST APIs

AI-assisted coding

DevOps/CI/CD

English B2+

Education

CS/Software Engineering degree

Tools

Docker

Kubernetes

LangChain/LangGraph

Claude Code

Cloud platforms (AWS/GCP/Azure)

Job description

5Blue Software, an Israeli-Ukrainian software development company, seeks a Senior Full-Stack Developer to build AI-powered B2B product solutions. You will own features end-to-end across React/TypeScript frontend and Node.js backend, contributing to architecture and AI-enabled workflows.

Join an international team delivering scalable cloud services, CI/CD processes, and robust security governance tooling. Remote work options are available, with collaboration across multiple time zones and English