Senior JavaScript/React Engineer

Salary: ? - ? € per year Requirements: Several years of software engineering experience (3 years or more) Strong expertise in building full-stack applications using Python and JavaScript (React, Node.js), able to work across backend and frontend codebases Experience deploying scalable, production-grade software using modern languages and tools Deep understanding of software architecture, design, development, debugging, and code quality/review assessment Excellent oral and written communication skills for clear, structured evaluation rationales Ideal background: experience building production systems at high-scale engineering organizations (e.g., Google, Microsoft, Apple, Amazon, Meta) or strong graduates from leading programs (Harvard, Columbia, Princeton, Yale, UPenn) — exceptional experience/skill takes precedence Candidates must be based in the United States Responsibilities: Create cutting-edge datasets for training, benchmarking, and advancing large language models, collaborating closely with researchers Curate code examples, provide precise solutions, and make corrections across the full stack (Python for backend/ML workflows; JavaScript: React, Node.js for frontend/API; plus C/C++, Java, Rust, Go) Evaluate and refine AI-generated code for efficiency, scalability, and reliability across backend and frontend contexts Collaborate with cross-functional teams to enhance enterprise-level AI-driven coding solutions and meet industry performance benchmarks Build agents that can verify code quality and identify error patterns across full-stack applications Hypothesize on steps in the software engineering cycle (prototyping, architecture design, API design, production implementation, launch, experiments, monitoring, maintenance) and evaluate model capabilities on them Design verification mechanisms that can automatically verify a solution to a software engineering task Technologies: AI API Backend FastAPI Frontend Java JavaScript Python React Rust NodeJS More: - Role: Remote Senior JavaScript/React Engineer (also described as a Java engineer) - Salary: 200 - 300 USD per HOUR - Tech stack: JavaScript, React, Python, Java, FastAPI - View this job and over 500 other transparent jobs with salaries & tech stacks on DevITJobs - Category: Java Developer / Engineer - Location address: 548 Market Street, PMB 18282, San Francisco, United States - Benefits & perks: Fully home office / remote work, Flexible work time - Engagement details: flexible engagement (minimum 10 hrs/week, up to 40 hrs/week); Type: Contractor (no medical/paid leave); Duration: 1 month (potential extensions based on performance and fit) - Evaluation process: application takes ~15–30 minutes; completion of an AI video interview is required - Misc: Are you looking for Java jobs in San-Francisco? last updated 27 week of 2026