Founding Senior Software Engineer (AI Tooling) $175,000 - $200,000 + 0.5% to 3% equity + Benefits + Relocation Assistance + PTO San Francisco, CA - Hybrid

Are you an engineer who values high autonomy and wants to join a fast-moving startup at the ground floor? Do you want to help design and build both the frontend experiences and backend infrastructure that power AI applications used by thousands of developers worldwide?

Backed by top VCs and with an existing client portfolio boasting enterprises such as Netflix and Adobe, the company is now looking to rapidly expand its platform and supercharge growth.

This is an exciting opportunity to join a profitable, fast-growing AI startup already on track for $10M ARR by 2026. The team is building a unified platform that lets developers seamlessly integrate with multiple large language models through a single, high-performance API. With strong enterprise adoption and rapidly growing demand, the company is pushing the limits of throughput, latency, and scalability in production systems.

As part of a lean, high-caliber team, you'll work directly with the founding leadership on full-stack features that impact the developer experience end-to-end. You'll take ownership of features from UI design to backend implementation, helping scale the platform to millions of requests, improve performance and reliability, and build tools that developers rely on daily. You'll work across a modern stack including Python, FastAPI, JavaScript/TypeScript, React, Redis, Postgres, and cloud storage.

If you're looking to join a stable early-stage start-up at its inflection point, offering excellent equity, a strong team, and real autonomy, this is a standout opportunity.

The Role: Upgrade core systems for 10× higher throughput Add new LLM features and handle provider-specific quirks Scale analytics and cost tracking for millions of logs Build intuitive UI with React and full-stack features across Python/FastAPI Work across a modern stack: Python, FastAPI, React, JS/TS, Redis, Postgres, S3, GCS, Datadog, Slack API The Person: 1-2 years of full-stack experience with production systems Strong React/UI skills and backend proficiency in Python (FastAPI a plus) Experience scaling infrastructure and distributed systems Looking for high autonomy and ownership, and thrive in fast-moving teams

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