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Senior Platform Engineer (AI Agent Runtime) - San Francisco

techtree • United State
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AI Summary

Build and maintain the execution engine for long-running AI agent sessions, ensuring stateful backend systems handle concurrency, retries, and recovery in production. Design scalable architectures for hybrid AI-software workflows, managing session state, tool failures, and cross-release continuity. Requires deep expertise in stateful systems, TypeScript, and distributed runtime environments.

Key Highlights
Design and implement the runtime engine for AI agent sessions, handling session state and tool failures
Architect scalable concurrency models (actors vs. jobs) and recovery mechanisms for long-running processes
Own production-grade code for retries, timeouts, and cross-release continuity of interrupted tasks
Key Responsibilities
Develop the runtime engine for AI agent sessions, managing session state and tool interactions
Design and implement concurrency models (actors vs. jobs) for overlapping session handling
Ensure long-running processes drain or resume correctly across software releases
Handle retries, timeouts, and external action recovery in production systems

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Technical Skills Required
TypeScript Stateful backend systems Concurrency and distributed systems
Benefits & Perks
Base salary $180,000–$240,000
Meaningful early-stage equity
Health, dental, and 401(k) benefits

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Nice to Have
Experience with Cloudflare Workers or Durable Objects
Debugging concurrency, retries, or recovery in owned code

Job Description

This is a role that TechTree is an AI-driven recruitment platform working with high-growth companies.When you apply, our AI Agent matches you , but to other relevant opportunities across our network, so We're building a hybrid of AI and software standing on one shared brain: it holds your context and hands you real software built on top of it. We're a team of about 15, backed by top-tier investors and Y Combinator, based in the Presidio, San Francisco.Our agent runtime has to keep track of work when a tool fails or new code ships mid-task. This is a senior, hands-on role — you'll make the architecture calls with the team, write the code, and own it in production.
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Job Overview
Posted Oct 27, 2026
Employment Full-time
Experience Mid-Senior level
Location United State
Category Programming
Company techtree
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