4D AGO

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

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

RATE

$45-$65/HR

LOCATION

UNITED STATES

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DESCRIPTION

Senior Software Engineer, Backend (Node.js, TypeScript, Rust) 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. 3. Core

REQUIREMENTS

▸Hands-on production coding experience in Node.js and TypeScript on the backend.
▸Hands-on coding experience in Rust, in production services, performance-critical modules, or substantial systems work.
▸Strong web fundamentals: HTTP semantics, cookies, headers, caching, sessions, and server-to-server communication patterns (auth between services, timeouts, retries).
▸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.