Sierra
Software Engineer, Horizon
$230K–$390K
San Francisco, CA · On-site · Full-time · Posted Oct 22, 2026
- Experience
- At least two years of professional software engineering experience.
About the job
Build and productize long-horizon AI agents and the infrastructure that helps them pursue complex customer business outcomes and improve over time.
What you'll do
- Build agent feedback, evaluation, memory, and decisioning systems, and develop agents working across multiple channels.
- Turn validated solutions into reusable platform capabilities; solve problems across orchestration, integrations, data, and observability.
- Work with customers, product, and engineering to shape Horizon’s architecture and roadmap and support deployment handoffs.
What they ask for
- Experience building and scaling end-to-end production systems, with strong platform and systems engineering fundamentals.
- At least two years of professional software engineering experience.
- Experience with Python, TypeScript, or Go and React.
- Ability to work across customer problems, product design, and technical implementation.
Nice to have
- Experience building workflow, orchestration, event-driven, or distributed systems, or reusable platforms.
- Experience building or deploying AI and LLM-powered products.
Pay
$230K – $390K (base salary)
Tools
Python, TypeScript, Go, React
AI focus
Build long-horizon AI agents, plus feedback loops, evaluation systems, memory, signals, and decisioning infrastructure to help agents learn from outcomes and improve.
Model-written summary · the original posting is authoritative