Staff SW Engineer

• Required: 8+ years of hands-on software engineering experience, including time as a tech lead or driving architecture across a team or product.
• Required: Strong architectural skills, with a track record of designing and scaling production systems that handle real load.
• Required: Production experience with agentic systems, AI training pipelines, or inference pipelines, ideally more than one.
• Required: Hands-on experience deploying software on AWS with Kubernetes and Terraform, ideally into customer-managed or multi-tenant environments.
• Required: Experience building and running sandboxed execution environments for agent workloads, ideally with Modal Sandboxes.
• Required: Extensive experience building with AI coding agents, and a demonstrated ability to guide them to produce clean, production-quality code. You know how to scope tasks, review output critically, and catch what agents get wrong.
• Required: You thrive in ambiguity, make good calls without a playbook, and know when to move fast versus when to build for the long term.
• Optional: Experience building agent harnesses or frameworks used in production, including familiarity with MCP or similar tool protocols.
• Optional: Experience with LangSmith or similar tooling for tracing, evaluating, and monitoring agents.
• Optional: Hands-on experience with inference optimization, like batching, quantization, GPU utilization, or serving frameworks such as vLLM, SGLang, or Triton.
• Optional: Deep experience with high-concurrency backend systems or low-latency API design.
• Optional: Startup experience, ideally as an early engineer helping a team grow.

Full-time | San Francisco

• Join us at Fastino as we build the next generation of LLMs. Our team, boasting alumni from Google Research, Apple, Stanford, and Cambridge, is on a mission to develop specialized, efficient AI.
• Fastino's GLiNER family of open source models has been downloaded more than 50 million times and is used by companies such as NVIDIA, Meta, and Airbnb
• Fastino has raised $25M (as featured in TechCrunch) through our seed round and is backed by leading investors including Microsoft, Khosla Ventures, Insight Partners, GitHub CEO Thomas Dohmke, Docker CEO Scott Johnston, and others.