Senior Full Stack Developer (Node.js/ReactJS)

JavaScript

Senior Full Stack Developer (Node.js/ReactJS)

JavaScript
Emilii Plater 53, Warszawa +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

    AWS

    regular

    React

    regular

    SQL

    regular

    NoSQL

    regular

Office location

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