Length 30 minFormat CallThey grade Motivation, background, preferred language (Python or TypeScript), comfort with working in the office
Length 60 minFormat One live coding problem in Python or TypeScriptThey grade Data structures and traversal (including cycle detection), clean implementation, clear reasoningHeads-up Sierra has said this round may become a system design interview; check the current format.
Length variesFormat Build a customer-support AI agent for a made-up client and choose which features to ship; an OpenAI key is providedThey grade Product judgment, prioritization, agent fundamentals, metrics and observability, design rationaleAI use The agent must call the model and its tools directly, without an agent frameworkHeads-up Treat it as production code; you defend and extend it onsite.
Length 60 minFormat Find and fix several bugs in a prepared TypeScript and React appThey grade Fluency in the stack, systematic diagnosis, speed, and explaining each bug's effect on the userAI use Historically no AI coding tools; an AI-assisted version is being piloted, so ask
Length 60 minFormat Half a walkthrough of your take-home agent, half a talk on a technical topic of your choice for a non-technical audienceThey grade Defending your design, depth, and clear communication
Length 60 minFormat Conversation with the hiring manager, close to your resumeThey grade Ownership, collaboration, conflict, customer focus and Sierra's values (trust, customer obsession, craftsmanship, intensity, family)
