Senior Software Engineer, Agent Platform

Job summary

Responsibilities

As a Senior Software Engineer on the Agent Platform team, you will design and build the systems that govern how Decagon agents operate in real-world environments.

• Design and evolve agent harnesses that power different product experiences
• Build core runtime systems, including AOP execution and multi-model orchestration
• Develop control-plane logic for routing, planning, and tool invocation with strong safety guarantees
• Optimize agent systems for latency, reliability, and production correctness
• Analyze real-world failures and use data to drive iterative improvements

What they're looking for

• Strong experience building distributed systems or backend platforms in production environments
• Comfort working in ambiguous, fast-moving environments with rapid iteration cycles
• Experience owning systems end-to-end, from design through production and iteration
• Familiarity with experimentation, evaluation, or data-driven product improvement loops
• A track record of improving system reliability, performance, and observability