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Mechanical Engineering Intern Interview Experience - El Segundo, California

July 21, 2026
Positive ExperienceGot Offer

Process

I applied through an employee referral. The process took 3 weeks.

It was a fairly quick and flexible interview process for an undergraduate intern. It started with a ~30min behavioral phone interview, which gated a ~1hr Teams technical interview. From a bank of 10 mechE fundamentals questions (statics, heat and mass transfer, DFM, etc.), I got through around 6 in a whiteboard session with two engineers.

This gated an on-site, which included a ~2hr project presentation with a hiring manager and several engineers. More 1-on-1s would've been included, but most of the team was out-of-office for a critical test, so the presentation went on longer and involved more questions from engineers phoning in over Teams.

Questions

A person has a hot tub with an insulating body and cover, and they intend to leave for the weekend. They would like to know whether it would be more energy-efficient to leave the hot tub running covered all weekend, or let it cool down and heat up again afterwards. How would you solve this problem?

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Interview Statistics

The following metrics were computed from 1 interview experience for the Castelion Mechanical Engineering Intern role in El Segundo, California.

Success Rate

0%
Pass Rate

Castelion's interview process for their Mechanical Engineering Intern roles in El Segundo, California is extremely selective, failing the vast majority of engineers.

Experience Rating

Positive100%
Neutral0%
Negative0%

Candidates reported having very good feelings for Castelion's Mechanical Engineering Intern interview process in El Segundo, California.