Senior Fullstack Engineer, AI Agent Testing & Platforms

United States Digital Space LLC; United States; Hybrid; USD 140,000 - 180,000; Full time

Job summary

United States Digital Space LLC is seeking a Senior Fullstack Engineer to join the AI Agent Testing team, focusing on backend services, APIs, and event-driven systems that power AI agent evaluation at scale.

You will collaborate with product, data, and ML partners, ship end-to-end features, and help shape technical direction while maintaining high engineering quality. Our hybrid work model enables in-person collaboration across global offices with remote flexibility.

Qualifications

• 5+ years of experience building modern web applications using TypeScript, React, and Node.js.
• Strong design experience for backend services, APIs, and event-driven systems.
• Understanding of clean architecture, testing strategy, observability, and maintainability.
• Ability to drive complex projects end-to-end while collaborating across functions.
• Excellent communication, proactive mindset, and ability to influence technical decisions.

Responsibilities

• Collaborate with product, design, AI/ML, and data teams to deliver internal and customer-facing capabilities.
• Ship features end-to-end and help shape technical direction while improving quality and reliability.
• Design and implement scalable backend services and data workflows.
• Mentor engineers through code reviews and design discussions.
• Contribute to the observability, reliability, and performance of the systems.

Skills

TypeScript

React

Node.js

APIs

Event-driven

Testing

Observability

Communication

Product mindset

Tools

AWS

Kubernetes

Terraform

ArgoCD

Sentry

Redis

Datadog

GitHub Actions

Job description

United States Digital Space LLC is seeking a Senior Fullstack Engineer to join the AI Agent Testing team, focusing on backend services, APIs, and event-driven systems that power AI agent evaluation at scale.

You will collaborate with product, data, and ML partners, ship end-to-end features, and help shape technical direction while maintaining high engineering quality. Our hybrid work model enables in-person collaboration across global offices with remote flexibility.