Agents in Orbit: Workflows, Not Autopilot — Eduardo Simon & Javier Casal, Flywire

This post introduces Orbit, Flywire's internal platform for integrating AI model steps into deterministic engineering workflows. Orbit allows AI-driven tasks to be defined in YAML, subjected to standard code review, and executed on existing infrastructure. Key technical contributions include the separation of orchestration, execution, and session state; implementation of timeouts, rate limits, and locks; per-step restrictions on network access, tools, and skills; and the use of structured outputs to drive workflow branches. The platform supports a range of engineering use cases, with a focus on predictable work staying in code and AI providing judgment, while human review remains integral.