Length 30 minFormat CallThey grade Background, motivation, and hard constraints (start date, location, days in office, on-call)
Length 45 minFormat Live coding in a CoderPad-style editorThey grade Practical stateful designs and their per-operation cost; clear handling of ambiguous rulesHeads-up Reported problems include a shopping cart with undo and redo and a satisfaction-score tracker; concurrency and async code can come up.
Length 60 minFormat Build a small working feature with the interviewer as a teammateThey grade Clean, tested code over clever tricks
Length 60 minFormat Design discussionThey grade Clarifying load and latency first, covering failure pathsHeads-up Topics come from the product: customer-support agents, retrieval with vector search, routing across LLM providers, an AI gateway with auditing.
Length 60 minFormat Discussion of a project you ownedThey grade Your real role, probed until its edges; details must stay consistent across interviews
Length variesFormat ConversationThey grade Ownership, pace and customer focus, against Decagon's published valuesHeads-up At least one candidate reports being turned down at this round after strong technical rounds.
