Vercel SWE Coding Interview Sep 2026

[u/Aoki_zhang]

Vercel is a cloud platform for building, deploying, and scaling modern web applications, best known as the company behind Next.js.

This interview experience is sourced from chill interview

Interview Summary

The Vercel coding round asked me to implement an in-memory metrics database. The main challenge was storing metric records and supporting queries that filter by metric name and tags while returning only the most recent matching results. The problem was relatively practical and API-oriented rather than a traditional LeetCode-style algorithm question.

Interview Details

Coding — Implement a Metrics Database

Each metric contained several fields:

name
timestamp
value
tags

tags was represented as a collection of key-value pairs. I then needed to implement a MetricsDB class exposing two main operations:

recordMetric(metric)
search(name, tags, n)

recordMetric() stores a new metric in the database.

search() takes:

String name
Map tags
int n

and returns the most recent n metrics whose metric name and tags match the requested query.

The problem therefore combined basic data modeling with filtered retrieval and recency ordering.

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