Founding Backend Engineer, AI API Infra (SF)

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

Job summary

Remotestar is seeking a backend-leaning Founding Engineer in San Francisco to own end-to-end projects shaping core infrastructure for AI agents. The role covers building APIs, design, and production rollout in a fast-moving early-stage environment.

You will work mostly on the backend, interact with distributed systems and databases, and ship features from 0 to 1 with real users. A CS degree and a track record at FAANG or VC-backed startups are preferred.

Qualifications

• CS or technical degree from a top engineering school (especially for new grads).
• Strong proficiency in TypeScript or modern equivalent frameworks.
• Deep backend fundamentals: REST API design, system design, server-side architecture.

Responsibilities

• Build and design APIs and backend infrastructure that AI agents use to communicate, authenticate, and operate.
• Own 0-1 projects end-to-end - from scoping customer requirements through system design to production rollout (e.g., IMAP integration, usage-based pricing systems).
• Work across the full stack (~80% backend, ~20% frontend/other), touching distributed systems, databases, and developer tooling.
• Be a frontline point of contact for customer feedback and support enterprise deployments.
• Write clear, maintainable code and documentation while processing hundreds of thousands of emails per day.

Skills

TypeScript

APIs

System design

Server-side architecture

Shipping features

Strong communication

Education

CS degree

Job description

Remotestar is seeking a backend-leaning Founding Engineer in San Francisco to own end-to-end projects shaping core infrastructure for AI agents. The role covers building APIs, design, and production rollout in a fast-moving early-stage environment.

You will work mostly on the backend, interact with distributed systems and databases, and ship features from 0 to 1 with real users. A CS degree and a track record at FAANG or VC-backed startups are preferred.