Job Closed
This listing is no longer active.
Cincinnatus is an enterprise staffing company that partners with leading technology companies to source and employ highly skilled professionals for full-time and long-term contingent roles. Cincinnatus serves as the employer of record for these engagements, providing W-2 employment, payroll, benefits, and compliance, while placing employees directly within client teams to work on high-impact initiatives. Roles hired through Cincinnatus are not project-based or freelance engagements. They are structured, role-based positions that typically involve full-time or fixed-term commitments, close collaboration with a client's internal teams, and integration into standard enterprise workflows. Cincinnatus is a legal entity separate from Mercor. While opportunities may be discovered through Mercor's platform, employment, onboarding, payroll, and benefits for these roles are administered by Cincinnatus. Equal Employment Opportunity Cincinnatus is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, reproductive health decisions, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, political views or activity, or any other legally protected characteristic. Cincinnatus is committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans throughout the job application process.
Senior Front-End Engineer
Location
United States
Posted
78 days ago
Salary
$70 - $80 / hour
Seniority
Senior
Job Description
Senior Front-End Engineer
Mercor
Role Description Mercor connects elite creative and technical talent with leading AI research labs. Headquartered in San Francisco, our investors include Benchmark, General Catalyst, Peter Thiel, Adam D'Angelo, Larry Summers, and Jack Dorsey. Position: Software Engineer Type: Freelance Compensation: $70–$80/hour Location: Remote Duration: 1–2 months Commitment: 15–25 hours/week, with flexibility up to 40 hours/week Role Responsibilities - Write realistic, self-contained prompts for client-side web apps, games, tools, and simulations. - Create precise, binary rubrics tagged by verification type. - Ensure all rubric items are pass/fail and verifiable from screenshot and code inspection. - Develop high-quality vibe coding data to train models on client-side web development skills, including state management, interactivity, UI correctness, and robustness. - Collaborate with AI labs to improve AI model performance on real-world client-side web development tasks. - Work independently and asynchronously to meet deadlines while enhancing AI model performance. Qualifications - 2+ years of experience in frontend/full-stack development or technical content creation. - Bachelor's degree in Software Engineering, Computer Science, or a related field. - Strong proficiency in JavaScript, TypeScript, React, or vanilla JS. - Comfortable writing precise technical specifications and evaluation criteria. Requirements - Start Date: Immediate Application Process - Upload resume - AI interview: A short, 15-minute conversational session to understand your background, experience, and interest in the role - Follow-up communication within a few days with next steps and onboarding details Resources & Support - For details about the interview process and platform information, please check: Interview Process Details - For any help or support, reach out to: support@mercor.com - PS: Our team reviews applications daily. Please complete your AI interview and application steps to be considered for this opportunity.
Job Requirements
- 2+ years of experience in frontend/full-stack development or technical content creation.
- Bachelor's degree in Software Engineering, Computer Science, or a related field.
- Strong proficiency in JavaScript, TypeScript, React, or vanilla JS.
- Comfortable writing precise technical specifications and evaluation criteria.
- Start Date: Immediate
- Application Process
- Upload resume
- AI interview: A short, 15-minute conversational session to understand your background, experience, and interest in the role
- Follow-up communication within a few days with next steps and onboarding details
- Resources & Support
- For details about the interview process and platform information, please check: Interview Process Details
- For any help or support, reach out to: support@mercor.com
- PS: Our team reviews applications daily. Please complete your AI interview and application steps to be considered for this opportunity.
Related Guides
Related Job Pages
More Frontend Engineer Jobs
• Build and enhance modern, responsive frontend applications using React and TypeScript • Collaborate on backend services using Node.js / Nest.js to support new and existing features • Work across the stack to deliver end-to-end product functionality in a fast-moving environment • Partner with product and cross-functional teams to translate requirements into scalable and intuitive user experiences • Contribute to modernizing and improving the frontend architecture • Integrate with APIs, third-party services, and marketplace systems • Ship features quickly in a team with frequent production deployments • Take ownership of features and projects, from design to deployment • Collaborate closely with a small team where your technical decisions have immediate impact • Leverage AI tools and workflows to accelerate development and improve productivity
Senior Full-Stack Developer – TypeScript, React, Next.js
BuildofarmThe #1 Online Educational Platform For Commodity Brokers.
• Lead full-stack development of enterprise applications from concept to deployment • Take full ownership of features, including planning, implementation, and monitoring • Architect and implement scalable backend services and APIs using modern frameworks such as tRPC • Build responsive, high-performance user interfaces with modern React patterns (hooks, context, performance optimization) • Design and optimize database schemas and queries (PostgreSQL + Prisma or Drizzle ORM) • Implement secure authentication and authorization systems • Develop real-time features using WebSockets and event-driven architecture • Write comprehensive tests to maintain high-quality code standards • Identify and solve critical issues proactively before they impact the product
• Develop and optimize user interfaces across web and mobile platforms • Ensure high performance and scalability • Collaborate with the team to create innovative solutions
Front-End Developer (React) – Specialist I
Grupo BoticárioCriamos oportunidades para a beleza transformar a vida das pessoas, e assim transformar o mundo ao nosso redor.
• Focus on React.js: Implement complex features and build resilient user interfaces. • Agents + VDI Integration: Develop deliverables that connect the AI Agents platform with the Direct Sales ecosystem. • Act as a "Solver": Serve as a technical reference to resolve high-complexity frontend problems. • Idea Validation (Spikes and PoCs): Actively participate in technical studies (Spikes) and Proofs of Concept to test the feasibility of new AI technologies. • Generative AI in Practice: Support implementation of GenAI solutions to boost sales force KPIs. • Squad Ceremonies: Actively participate in Dailies, Flow Reviews and refinements (both functional and technical). • Continuous Improvement: Propose and implement optimizations in the team's development flow to make it more agile and efficient. • Clean Code and Reviews: Maintain low technical debt through optimized code and participation in Code Reviews. • Observability and Testing: Implement E2E tests, error monitoring and ensure accurate data tagging. • Cost Management: Monitor the system's financial/operational health (infrastructure/API costs) and technical performance.
