Senior Full Stack Developer (Node.js/ReactJS)

SigmaSoftware2

Warsaw, Masovian Voivodeship, Poland Remote permanent

Posted: February 3, 2026

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.

• 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

• 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

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