Senior Full Stack Engineer (ReactJS/Node.js)

Sorry, this job was removed at 10:21 a.m. (CST) on Tuesday, Jan 06, 2026
Be an Early Applicant
Warsaw, Warszawa, Masovian
In-Office
Software
The Role
Company 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. 

Job Description

  • Design, develop, and maintain scalable applications across Front-end and Back-end layers 
  • Build a responsive, user-friendly UI using ReactJS 
  • Develop robust Back-end services and APIs (REST/GraphQL) using Node.js 
  • Collaborate closely with data engineers 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 

Qualifications

  • 5+ years of professional experience with JavaScript, including modern frameworks and tools, for building efficient and maintainable applications 
  • Expertise in Node.js for building scalable Back-end services and APIs 
  • Strong experience with React for designing maintainable, scalable UI systems 
  • Experience in designing and implementing Data APIs for efficient data workflows 
  • Hands-on experience with AWS or GCP, including cloud deployment and management 
  • Strong knowledge of RESTful APIs, microservices, and database systems (SQL/NoSQL) 
  • Upper-Intermediate level of spoken and written English 

WOULD BE A PLUS

  • Experience with model context protocol (MCP) for managing context in AI model interactions 
  • Familiarity with workflow automation tools such as n8n 
  • Knowledge of DevOps practices, CI/CD pipelines, or containerization (e.g., Docker, Kubernetes) 

Additional Information

PERSONAL PROFILE

  • Strong problem-solving skills 
  • Attention to detail 
  • Ability to work independently 
  • Excellent communication and collaboration skills 

Similar Jobs

Mastercard Logo Mastercard

Consultant

Blockchain • Fintech • Payments • Consulting • Cryptocurrency • Cybersecurity • Quantum Computing
Hybrid
Warsaw, Warszawa, Masovian, POL
38800 Employees

Mastercard Logo Mastercard

Senior Business Analyst

Blockchain • Fintech • Payments • Consulting • Cryptocurrency • Cybersecurity • Quantum Computing
Hybrid
Warsaw, Warszawa, Masovian, POL
38800 Employees

Mastercard Logo Mastercard

Senior Graphic Designer

Blockchain • Fintech • Payments • Consulting • Cryptocurrency • Cybersecurity • Quantum Computing
Hybrid
Warsaw, Warszawa, Masovian, POL
38800 Employees

Mastercard Logo Mastercard

Manager, Specialist Sales, Advisors Business Development

Blockchain • Fintech • Payments • Consulting • Cryptocurrency • Cybersecurity • Quantum Computing
Hybrid
Warsaw, Warszawa, Masovian, POL
38800 Employees
Get Personalized Job Insights.
Our AI-powered fit analysis compares your resume with a job listing so you know if your skills & experience align.

The Company
New York, New York
1,516 Employees

What We Do

Sigma Software Group, an award-winning and trusted IT partner, has been serving customers for over 21 years, providing comprehensive IT solutions to various businesses, ranging from startups to established software product houses. As one of Europe's substantial IT consultancies, it brings together a dedicated workforce of over 2,100 professionals in 40 offices across 19 countries. With a diverse client base, including more than 300 enterprises, including Fortune 500 stalwarts, Sigma Software Group is a preferred choice for developing solutions that help businesses create cutting-edge products while meeting their unique needs.

Sigma Software Group operates as a dynamic ecosystem of tech companies, offering 25 ready-to-implement innovative products and 40+ value-added services. Furthermore, Sigma Software Group is committed to fostering innovation through initiatives such as the Sigma Software Labs business incubator, Sigma Software University, the SID Venture Partners VC Fund, UA Tech Network, Techosystem, the European Business Association, and other collaborative efforts.

Since 2015, Sigma Software Group has consistently earned recognition on the IAOP's prestigious World's Top 100 Outsourcing list. The company's accomplishments have also been acknowledged by prominent global media outlets such as Forbes, CNBC, The Times, and Reuters

Similar Companies Hiring

Scotch Thumbnail
Software • Retail • Payments • Fintech • eCommerce • Artificial Intelligence • Analytics
US
25 Employees
Milestone Systems Thumbnail
Software • Security • Other • Big Data Analytics • Artificial Intelligence • Analytics
Lake Oswego, OR
1500 Employees
Fairly Even Thumbnail
Software • Sales • Robotics • Other • Hospitality • Hardware
New York, NY

Sign up now Access later

Create Free Account

Please log in or sign up to report this job.

Create Free Account