Senior Backend Engineer: Node.js/TypeScript, Rust + AI Scale

Mercor; San Francisco (CA); On-site; USD 180,000 - 240,000; Full time

Job summary

Cincinnatus LLC is placing a Senior Backend Engineer to build the services powering consumer-facing experiences at scale. You will work across web and mobile, delivering robust backend systems in Node.js, TypeScript, and Rust while integrating REST/GraphQL APIs and AI capabilities.

The role requires strong web fundamentals, experience with high-traffic platforms, and the ability to own outcomes as a senior engineer.

Qualifications

• 4+ years of professional software engineering experience building production systems

Responsibilities

• Lead delivery of scoped features through collaborative engineering teams
• Design, develop, test, and maintain high-quality services in Node.js, TypeScript, and Rust
• Build and optimize server-to-server integrations and API layers (REST and GraphQL)
• Integrate AI/ML capabilities into product services and use generative AI tools
• Contribute to solution design, conduct code reviews, and apply best practices for scalable, secure, and maintainable systems
• Monitor application performance, support defect resolution, and drive continuous improvement
• Mentor peers and contribute to knowledge sharing and engineering excellence across the team

Education

Bachelor's degree in Computer Science or related field

Tools

Node.js

TypeScript

Rust

GraphQL

REST

HTTP

Job description

Cincinnatus LLC is placing a Senior Backend Engineer to build the services powering consumer-facing experiences at scale. You will work across web and mobile, delivering robust backend systems in Node.js, TypeScript, and Rust while integrating REST/GraphQL APIs and AI capabilities.

The role requires strong web fundamentals, experience with high-traffic platforms, and the ability to own outcomes as a senior engineer.