Retell AI interview questions

Showing 1–8 of 8 results

• Connect a Local FastAPI Service to an AI Agent Platform to Save and Read Back IssuesMedium

  A live coding exercise on connecting a local Python FastAPI service to a hosted conversational AI agent platform so the agent can save issues a user reports and read past issues back during a conversation. It tests tool and endpoint design, making a local server reachable, user identification, speech-friendly responses and failure handling.

  Retell AISoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Describe a Time You Explained a Complex Technical Concept to Non-Technical PeopleEasy

  A behavioral question for a customer-facing engineering role: describe one specific time you explained a complex technical concept to a non-technical audience and how you approached it. Tests STAR storytelling, audience analysis, accurate analogies and how the candidate checks that the message landed.

  Retell AISoftware EngineerBehavioral & LeadershipHR Screen
• Design a Cloud Call-Center Platform for Programmatic Outbound CallsHard

  This question evaluates a candidate's ability to design a distributed, asynchronous system under hard external rate and capacity constraints. It tests system design fundamentals such as queueing, backpressure, state-machine modeling, and multi-tenant fairness, commonly asked to assess architectural reasoning at a practical, applied level rather than pure theory.

  Retell AISoftware EngineerSystem DesignTechnical Screen
• Design a Smooth Per-Customer Calls-Per-Second ControllerMedium

  Design a distributed outbound call pacing service that enforces smooth per-tenant calls-per-second (CPS) rate limits while ensuring durable queueing, priority scheduling, and safe failover.

  Retell AISoftware EngineerSystem DesignTechnical Screen
• Design and Implement a Mini SQL Query EngineHard

  This question evaluates a candidate's ability to design and build a small SQL query engine, covering tokenization, parsing, and query execution over in-memory tables. It tests system design and compiler-style thinking, including how to scope a large problem into an extensible v1 and reason about extending it with sorting, aggregation, and joins. This is a system design and practical implementation question assessing both architectural judgment and coding ability.

  Retell AISoftware EngineerSystem DesignTechnical Screen
• Design collaborative document editing backendMedium

  This question evaluates a candidate's ability to design real-time collaborative systems, focusing on distributed systems concepts, concurrency control, consistency models, synchronization, and scalable backend architecture.

  Retell AISoftware EngineerSystem DesignOnsite
• Evaluate a Small Stack-Based Integer LanguageEasy

  Implement an interpreter for a stack-based integer language supporting arithmetic, stack manipulation, output, and immediate error reporting with partial output preservation.

  Retell AISoftware EngineerCoding & AlgorithmsTechnical Screen
• Query an Indexed In-Memory Numeric TableMedium

  This problem tests the ability to implement efficient multi-column indexing using binary search and sorted set intersections to handle complex range queries.

  Retell AISoftware EngineerCoding & AlgorithmsTechnical Screen