Nextmark

Senior Software Engineer (Typescript)

Contractor · Remote · 10 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

  • Design, develop, and deploy high-quality full-stack applications using TypeScript, Node.js, and React.
  • Architect and maintain scalable microservices and distributed systems, ensuring resilience and performance.
  • Lead code reviews, enforce best practices, and mentor fellow engineers to elevate team standards.
  • Collaborate with cross-functional teams in an Agile/Scrum environment, focusing on seamless project delivery.
  • Implement and optimize REST APIs, ensuring data integrity and security across PostgreSQL and MongoDB databases.
  • Drive continuous integration and deployment (CI/CD) strategies, emphasizing cloud platform efficiency.
  • Identify and resolve complex performance bottlenecks, promoting proactive problem-solving and system design excellence.

Required Skills & Qualifications

  • 4+ years of experience building full-stack applications with TypeScript, Node.js, React, and Express.js.
  • Demonstrated expertise in microservices architecture, RESTful APIs, PostgreSQL, and MongoDB.
  • Strong system design and scalable architecture skills, with a passion for distributed systems.
  • Advanced knowledge of HTML5, CSS, and modern web technologies.
  • Proven leadership in code reviews, mentorship, and fostering high code quality.
  • Solid experience with CI/CD pipelines and cloud platforms (AWS, Azure, or GCP).
  • Exceptional written and verbal communication skills, with the ability to coordinate complex initiatives and document technical decisions.

Preferred Qualifications

  • Experience with performance tuning and advanced debugging in production environments.
  • Background in designing highly available, fault-tolerant systems at scale.
  • Contributions to open-source projects or technical communities.

$30–$120/hr

Remote