real interview stories, told over a cup of tea ♡
C3 AI Interview Experiences
3935 interview stories from candidates at 857 companies: how each round went, what was asked and how it ended. Every company page links to practice questions in the same style.
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6 results
- ML Multiple Choice and Production Request SchedulingC3 AI · Data Scientist · Intern · Online Assessment · Sep 2026
Question 1: Vanishing Gradient Which of the following is NOT a potential solution to the vanishing gradient problem in a deep neural network? Adding skip connections to the neural network architecture Using a different activation function like ReLU Raising the learning rate Adding Batch Normalization between layers Question 2: Boosting Classification For the classification problem, Boosting is wi…
- Broad Topics, Fast Answers, and a RejectionC3 AI · Data Scientist · Technical Screen · Aug 2026Rejected
Problem Solving How would you predict the amount of food to keep in storage? This was a fairly basic data science case. ML / Algorithms Bias-variance tradeoff Curse of dimensionality Bagging versus boosting PCA Autoencoders Gradient descent How to keep gradient descent from getting stuck in a local minimum How to evaluate RAG Transformers versus RNNs How to calculate the complexity of attention s…
- The Coding Interviewer Never AppearedC3 AI · Data Scientist · Technical Screen · Aug 2026Rejected
This company still has an online OA, which I found a little surprising. It included some multiple-choice questions, and the last problem was a divide-and-conquer problem, LeetCode 395. In the first-round HM interview, the kind interviewer let me through. Second round: A 30-minute ML system-design interview. The interviewer asked me to design a shop-logistics system. Grocery-store products spoil e…
- The Coding Round Did Not Match Earlier ReportsC3 AI · Data Scientist · Onsite · Aug 2026Rejected
Process: OA → HR BQ → ML Case → ML Knowledge → Coding, for four interview rounds in total. I should be done here. OA: The same questions as the 2023 version on the forum. If you read through the interview reports here from beginning to end, you should basically be fine. HM BQ: The questions went into more detail than I expected. There were a lot of self-evaluation questions, such as what I though…
- Three Multiple-Choice Questions and Two Coding ProblemsC3 AI · Software Engineer · New Grad · Online Assessment · Jan 2026
Three multiple-choice questions and two coding questions on HackerRank, with no camera required. Multiple-choice questions Time Complexity Hash There are 7 computers in a network (numbered from 0 to 6). Each network request is assigned to one of those computers. Hash function used for that is: H(id) = id % 7 Which computer will have maximum load if the request ids are... A retrieval augmented gen…
- One Interviewer No-Show, One Walked Out Mid-InterviewC3 AI · Software Engineer · Onsite · Nov 2025Rejected
I mass-applied online, and HR reached out to set up an interview directly — there was no HR phone screen first. They never shared the job details or the salary range, and went straight to scheduling a 30-minute behavioral round with the hiring manager. The behavioral round with the manager went okay. I asked him about salary and he had no idea about anything. After getting through the behavioral…
