Fastino
Staff SW Engineer
San Francisco Bay Area · On-site · Staff · Full-time · Posted Oct 30, 2026
- Experience
- 8+ years; must include time as a tech lead or driving architecture across a team or product.
About the job
Build and scale Fastino’s AI platform, agent infrastructure, training and inference pipelines, and customer deployments while helping set technical direction and engineering practices.
What you'll do
- Design agent runtimes and evaluation harnesses, and build AI training and inference pipelines.
- Deploy and operate the platform in customer-managed AWS environments, including sandboxed execution for agent workloads.
- Set technical direction, ship end-to-end features, partner with researchers and customers, and mentor engineers.
What they ask for
- 8+ years of hands-on software engineering experience, including time as a tech lead or driving architecture across a team or product.
- Strong architecture skills and a track record designing and scaling production systems under real load.
- Production experience with agentic systems, AI training pipelines, or inference pipelines.
- Hands-on experience deploying software on AWS with Kubernetes and Terraform; experience with sandboxed execution environments for agent workloads; extensive experience building with AI coding agents.
Nice to have
- Experience building production agent harnesses or frameworks, including MCP or similar tool protocols; familiarity with LangSmith or similar tools.
- Inference optimization, high-concurrency or low-latency systems, or startup experience.
Tools
AWS, Kubernetes, Terraform, Modal Sandboxes, MCP, LangSmith, vLLM, SGLang
AI focus
Build agent infrastructure and evaluation, AI training and inference pipelines, sandboxed agent execution, and production deployment of new models; guide AI coding agents.
Model-written summary · the original posting is authoritative