Toast, Inc. Software Engineer Interview Guide

The live coding screen was the part that demanded the most focus. I was given a partially completed restaurant system in HackerRank and asked to add functionality for returning the top restaurants by total order value. It began as a medium-difficulty coding task, but the interviewer kept extending it: how would I make it scale, keep it extensible, and turn it into a more reusable solution? The question was explained clearly and the interviewer was helpful, but the 30-minute LeetCode-style format made it important to get to a working approach quickly.

After that, I went through a larger panel loop with conversations around the team and hiring manager, plus API and architecture-focused interviews. The high-level design exercise was to design a scalable restaurant table-booking system. I discussed the core components, data model, APIs, concurrency, and scalability. Another round was more of a code-design and review discussion: I looked at an existing codebase, identified design and performance problems, and talked through targeted improvements. That included caching to improve API performance, when denormalizing a data model might help, and API security considerations.

The behavioral portion covered my prior projects, ownership, technical decisions, collaboration, and difficult situations, including a discussion of my most recent project. Overall, the process was organized, with a good slot-selection experience and responsive HR early on, though I did not receive meaningful feedback afterward. I ultimately did not receive an offer. I would prepare to explain not only how to write a correct algorithm, but also how to improve its space and performance characteristics and evolve a straightforward implementation into a scalable service design.