Remote Senior Full-Stack Engineer — AI-Driven Auth & Scale

Legitmark; New York (NY); Remote; USD 140,000 - 210,000; Full time

Job summary

Legitmark is hiring a Senior Full-Stack Engineer to own features across our authentication stack and ship user-facing improvements. You’ll work asynchronously in a remote-first, flexible-hours environment with AI-assisted workflows to ship high-quality code fast.

You’ll design scalable APIs, improve reliability, and collaborate closely with product and authentication experts to shape our platform as we scale to millions of requests daily.

Qualifications

• 5+ years of experience in full-stack development.
• Proficiency in TypeScript, React, and Node.js.
• Experience building and scaling production systems.
• Strong fluency with AI-assisted development tools.

Responsibilities

• Build and maintain core authentication platform features end-to-end.
• Design and implement APIs that scale to millions of requests daily.
• Collaborate with product and authentication experts to ship user-facing features.
• Improve system reliability, performance, and observability.
• Contribute to technical decisions and help shape engineering culture.
• Integrate AI/ML components into production authentication workflows.

Skills

TypeScript

React

Node.js

AI tools

Full-stack

Tools

Cursor

Claude

Job description

Legitmark is hiring a Senior Full-Stack Engineer to own features across our authentication stack and ship user-facing improvements. You’ll work asynchronously in a remote-first, flexible-hours environment with AI-assisted workflows to ship high-quality code fast.

You’ll design scalable APIs, improve reliability, and collaborate closely with product and authentication experts to shape our platform as we scale to millions of requests daily.