Senior Backend Engineer: Scalable AI Platform

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

Job summary

Cincinnatus LLC is staffing a Senior Backend Engineer to join a platform team powering core customer-facing experiences for a leading enterprise client. You will build scalable services with Node.js, TypeScript, and Rust, design APIs, and integrate AI features to boost productivity.

The role emphasizes hands-on backend work, collaboration across disciplines, and a strong focus on performance, reliability, and scalable architectures.

Qualifications

• 4+ years of professional software engineering experience building production systems at high-scale organizations.
• Hands-on production coding experience in Node.js and TypeScript on the backend.
• Hands-on coding experience in Rust in production services or performance-critical modules.
• Strong web fundamentals: HTTP semantics, cookies, headers, caching, sessions, and server-to-server communication patterns.
• Experience building or operating high-traffic, consumer-facing web platforms.
• Experience with GraphQL on Node.js (schema design, resolvers, federation) is a plus.
• Familiarity with web accessibility standards is a plus.
• Demonstrable career progression to senior-level ownership.
• Ability to engage reliably for at least 40 hours/week during weekdays.
• Excellent written and verbal communication skills.

Responsibilities

• Lead delivery of scoped features through collaborative engineering teams, aligning with platform objectives.
• Design, develop, test, and maintain high-quality services in Node.js, TypeScript, and Rust across the full software lifecycle.
• Build and optimize server-to-server integrations and API layers (REST and GraphQL) for high-traffic apps.
• Integrate AI/ML capabilities and apply generative AI tools to improve engineering productivity.
• Contribute to solution design, code reviews, and maintainable systems.
• Monitor performance, resolve defects, and drive continuous improvement.
• Mentor peers and promote engineering excellence across the team.

Skills

Node.js

TypeScript

Rust

Web fundamentals

Education

Bachelor's degree in Computer Science or related field

Tools

GraphQL

Job description

Cincinnatus LLC is staffing a Senior Backend Engineer to join a platform team powering core customer-facing experiences for a leading enterprise client. You will build scalable services with Node.js, TypeScript, and Rust, design APIs, and integrate AI features to boost productivity.

The role emphasizes hands-on backend work, collaboration across disciplines, and a strong focus on performance, reliability, and scalable architectures.