Senior Software Engineer, Backend (Node.js, TypeScript, Rust)

HumanitApp; Northern (KY); Hybrid; USD 104,000 - 166,000; Full time

Job summary

Cincinnatus LLC is placing a Senior Backend Engineer on a platform team supporting a high-scale consumer platform used by millions. You will build services in Node.js, TypeScript, and Rust, and ship REST/GraphQL APIs at scale within CI/CD pipelines.

You will collaborate across engineering, UX, product, and analytics, mentor peers, and integrate AI/ML capabilities into production services, ensuring reliability and performance for enterprise clients.

Qualifications

• 5+ years backend development experience in scalable web systems.
• Proficiency with Node.js, TypeScript and Rust.
• Experience building REST and GraphQL APIs.

Responsibilities

• Lead delivery of scoped features through engineering teams aligned to platform objectives.
• Design, develop, test, and maintain services in Node.js, TypeScript and Rust within CI/CD.
• Build and optimize server-to-server integrations and API layers (REST/GraphQL).
• Integrate AI/ML capabilities into product services and use generative AI tools.
• Contribute to solution design, code reviews, and best practices for scalable systems.
• Monitor performance, resolve defects, and drive continuous improvement.
• Mentor peers and share knowledge across the team.

Skills

Node.js

TypeScript

Rust

Tools

GraphQL API

REST API

CI/CD

Job description

Overview

Join a high-scale consumer platform team as a Senior Backend Engineer, building the services behind digital experiences used by millions of people every day.

We're partnering with a large enterprise technology organization to place a Senior Software Engineer on a platform team that powers its core customer-facing experiences across web and mobile. The team works across Engineering, UX, Product, Business, and Analytics to ship fast, iterate through continuous experimentation and customer feedback, and integrate advanced capabilities such as Generative AI into production services. We're seeking senior backend engineers with hands-on Node.js, TypeScript, and Rust experience and a deep understanding of how the web works at scale. This is a full-time commitment of 40 hours per week.

This is a W-2 employment position with Cincinnatus LLC, with the opportunity to be placed within a leading enterprise client's engineering organization as part of their extended workforce.

Key Responsibilities

• Lead delivery of scoped features through collaborative engineering teams, keeping work aligned with platform and system objectives.
• Design, develop, test, and maintain high-quality, efficient services in Node.js, TypeScript, and Rust, across the full software lifecycle and CI/CD.
• Build and optimize server-to-server integrations and API layers (REST and GraphQL) that serve high-traffic, customer-facing applications.
• Integrate AI/ML capabilities into product services and use generative AI tools to improve engineering productivity.
• 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.

About Cincinnatus LLC: Cincinnatus LLC is an enterprise staffing company that partners with leading technology companies to source and employ highly skilled professionals for contingent and contract-based opportunities. Cincinnatus serves as the employer of record for these engagements, providing W-2 employment, payroll, benefits, and compliance, while placing employees directly within client teams to work on high-impact initiatives.

Equal Employment Opportunity: Cincinnatus is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, reproductive health decisions, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, political views or activity, or any other legally protected characteristic.

AI evaluation Clinical reasoning Rust Software engineering

Compensation context

The listing states $50 - $80 / hour. Confirm the final rate, workload, and payment terms during the official application process.

• Ability to engage reliably for at least 40 hours/week during weekdays.