Nextmark

Senior Fullstack Engineer

Contractor · Remote · 50 openings

In this role, you'll apply your expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world input. No prior experience in AI is required — your domain knowledge is what matters.

Key Responsibilities

  • • Architect and develop robust, scalable applications leveraging React and modern fullstack frameworks.
  • • Optimize application performance through advanced state management and frontend best practices.
  • • Design and implement efficient backend APIs, ensuring secure authentication and data integrity.
  • • Collaborate on system design decisions and evaluate architectural tradeoffs for scalability and maintainability.
  • • Integrate and optimize database solutions supporting complex business logic and high traffic.
  • • Drive CI/CD, deployment processes, and basic DevOps tasks to streamline releases and maintain system health.
  • • Leverage Adobe InDesign for integration or automation within product workflows, ensuring outstanding end-user results.

Required Skills & Qualifications

  • • Proven experience in advanced frontend development with React, focusing on performance and state management.
  • • Strong expertise in backend system design, building APIs, and understanding authentication mechanisms.
  • • Deep knowledge of database architecture, optimization, and scalable application patterns.
  • • Demonstrated ability to optimize large-scale systems, identifying and resolving performance bottlenecks.
  • • Familiarity with DevOps fundamentals, including CI/CD pipelines, system monitoring, and deployment automation.
  • • Experience with Adobe InDesign integration or workflow optimization.
  • • Solid foundation in software architecture and evaluating tradeoffs during system design.

Preferred Qualifications

  • • Experience working in distributed or fully remote engineering teams.
  • • Prior involvement in projects requiring extensive scalability or advanced optimization strategies.
  • • Knowledge of modern security and authentication practices beyond standard implementations.

$30–$120/hr

Remote