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 20 week of 2026