Senior Full Stack Developer, Node.js/ReactJS

Sigma Software Group

full-time

Posted on: 2/3/2026

Location Type: Remote

Location: Romania

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About the role

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

Benefits

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

JavaScriptNode.jsReactJSREST APIsGraphQLData APIsVectorDBAWSGCPSQL

Soft Skills

collaborationownershipcommunicationproblem-solvingadaptability