Senior Full Stack Developer (Node.js/ReactJS)

JavaScript

Senior Full Stack Developer (Node.js/ReactJS)

JavaScript
Wadowicka 7, Kraków +2 Locations

Sigma Software

Full-time
B2B, Permanent
Senior
Remote

Job description

We are looking for a Senior Full Stack Engineer to join one of our teams and help us build great products for our clients.

Join a globally recognized company, where innovation meets impact. With a team of seasoned professionals and a culture built on excellence, we deliver top-tier solutions that shape industries and drive meaningful results.


Become part of a company where your expertise is valued, your voice is heard, and your career is empowered!


Customer

Our client is a global content and information company shaping the future of media and data. With a century-long legacy and a strong focus on innovation, the team builds trusted experiences and tools that inform, inspire, and empower millions of people worldwide.


Requirements

  • 5+ years of professional experience with JavaScript, including modern frameworks and tools

  • Expert proficiency in Node.js for scalable back-end services and APIs

  • Expertise in ReactJS for modern, responsive front-end interfaces

  • Experience designing and implementing Data APIs for efficient workflows

  • Familiarity with VectorDB or similar vector databases for AI/ML applications

  • Hands-on experience with AWS or GCP, including deployment and management

  • Strong knowledge of RESTful APIs, microservices, and database systems (SQL/NoSQL)

  • Upper-Intermediate level of spoken and written English


WILL BE A PLUS:

  • Experience with Model Context Protocol (MCP) for AI model interactions

  • Familiarity with workflow automation tools such as Langflow or n8n

  • Knowledge of DevOps practices, CI/CD pipelines, or containerization (Docker, Kubernetes)


Personal Profile

  • Strong problem-solving skills

  • Attention to detail

  • Ability to work independently

  • Excellent communication and collaboration skills


Responsibilities

  • Design, develop, and maintain scalable applications across front-end and back-end layers

  • Develop robust back-end services and APIs (REST/GraphQL) using Node.js

  • Build responsive, user-friendly UIs using ReactJS

  • Collaborate closely with data engineers and ML teams to integrate AI features and data-driven logic into the product

  • Optimize application performance, scalability, and reliability in a cloud environment

  • Implement best practices for security, CI/CD, testing, and code quality

  • Work with product and design teams to translate business requirements into technical solutions

  • Take ownership of features from ideation to deployment and monitoring in production

  • Stay up to date with emerging technologies and contribute to technical decision-making and innovation within the team

Tech stack

    English

    B2

    Node.js

    master

    JavaScript

    advanced

    NoSQL

    regular

    SQL

    regular

    AWS

    regular

    React

    regular

Office location

Published: 03.02.2026

About the company

Sigma Software

Sigma Software is a global software development company founded in 2002. It enables enterprises, startups, and product houses to meet their technology needs through end-to-end delivery, providing top-quality software dev...

Company profile

Senior Full Stack Developer (Node.js/ReactJS)

Summary of the offer

Senior Full Stack Developer (Node.js/ReactJS)

Wadowicka 7, Kraków
Sigma Software
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