Okta (Auth0) | Staff Backend Engineer | Oct 2026 | Rejected
Summary
I interviewed for a Staff Backend Engineer position at Okta (Auth0) in Oct 2026, completed a take‑home token bucket rate limiter assignment, a code review, a debugging task, and two system‑design questions, but was ultimately rejected.
Full Experience
Company: Okta (Auth0) Role: Staff Backend Engineer
Current Org: Small Startup College: Tier-1 YOE: 8+ Current Comp: 60L+
Round 1 - HM Screening Call Call with the hiring manager, a Director of Engineering (most of the team was based in Europe). Discussed past projects, behavioral questions, and various scenarios.
Take-Home Assignment (CodeSignal) Build a rate limiter in Node.js using the token bucket algorithm.
- Had to create an Express app that reads from a config file and exposes an API to send rate limit responses.
- Given sufficient time to code; the assignment was active for 24 hours.
Round 2 - Technical Two panel members (one Senior and one Principal, both from Europe) plus one additional engineer shadowing. The round was divided into three parts:
- Part 1: Code Review Discussion on my rate limiter implementation. Simple questions about why I structured the code the way I did.
- Part 2: Code Debugging / Optimization
They showed a simple Node.js Express API endpoint (
/authenticate). It takes a username and password, runs a DB query, and uses a bcrypt password hash match to return a 200 or an error. Task: Identify all missing logic in the API endpoint (e.g., input validation, proper error handling, appropriate HTTP status codes). The bcrypt compare was initially synchronous, and I had to make it asynchronous so it wouldn't block the event loop. - Part 3: System Design This part had two questions:
- A business has a
foo.comdomain and just bought abar.comdomain. They want the same user login across both. If a user logs into one, they should automatically be logged into the other. How would you build that flow? - A scenario around OIDC (OpenID Connect). You have multiple sites and need to provide login across those sites. You also need to provide your users with access to some third‑party tool within your app.
Self‑reflection: I had gone through OAuth basics before the interview, but I wasn't able to explain all of these concepts with full technical clarity.
Verdict: Rejected.
Feedback: HR didn't share much feedback, just mentioning there were communication issues and that my explanations were hard to follow.
Auth0 is a solid team. Hope this experience helps some other fellow engineers prepare better.
Interview Questions (4)
Rate Limiter using Token Bucket Algorithm
Build a rate limiter in Node.js using the token bucket algorithm. Create an Express app that reads from a config file and exposes an API to send rate limit responses.
Debugging Node.js Express Authentication Endpoint
Given a simple Express API endpoint /authenticate that takes a username and password, runs a DB query, and uses a bcrypt password hash match to return a 200 or error, identify all missing logic such as input validation, proper error handling, appropriate HTTP status codes, and convert the bcrypt compare from synchronous to asynchronous to avoid blocking the event loop.
Design Cross‑Domain Single Sign‑On Flow
Design a flow where a business owns foo.com and bar.com domains and wants the same user login across both; logging into one should automatically log the user into the other.
Design OIDC‑Based Multi‑Site Login with Third‑Party Access
Design a solution using OpenID Connect (OIDC) to provide login across multiple sites and also allow users to access a third‑party tool within the app.