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Aeonea

Small

Aeonea appears to be a small company or startup with limited publicly available information. Specific details about its industry, products, and operations are not widely documented.

4 interview notes · updated Jul 2026

Aeonea·Software Engineer·Technical Phone Screen

Jul 2026
Had a technical screen at Aeonea for a software engineer role. It was basically one meaty coding question about tennis scoring, which sounds simple but has enough edge cases to trip you up if you're not careful.
  • Design and implement a tennis game scoring function. Given a stream of points won by player A or B, output the current score after each point in standard tennis notation, handling the full 0/15/30/40 progression, Deuce, Advantage, and Game win with the correct two-point lead rule. Walk through your data structures and update logic, then trace through a specific example sequence.

“I thought I had this nailed in the first two minutes and then completely fumbled the Deuce/Advantage transitions.”

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Aeonea·Software Engineer·Technical Phone Screen

Jun 2026
Interviewed for a Software Engineer role at Aeonea and got hit with a pandas data cleaning question that had a few layers to it. Not the hardest thing in the world but the follow-up parts tripped me up a bit.
  • Given a pandas DataFrame with missing values across multiple numeric columns, write a concise expression to fill NaNs in each numeric column with that column's mean, without touching non-numeric columns. Then explain how you'd do it in-place, how you'd use per-group means based on a key column, and how you'd skip columns that are entirely NaN.

“The base case I had down pretty quickly.”

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Aeonea·Software Engineer·Technical Phone Screen

Jun 2026
Interviewed for a software engineer role at Aeonea and got hit with a classic two-sum problem, but they pushed pretty hard on the tradeoffs and edge cases rather than just accepting a working solution.
  • Given an unsorted integer array and a target value, find the indices of two distinct elements that sum to the target. Walk through your approach, aim for linear time, and discuss how you'd handle duplicates, negative numbers, and the no-solution case.

“I went straight to the hash map approach which is the right call, but I fumbled a bit explaining why I was trading space for time.”

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Aeonea·Software Engineer·Technical Phone Screen

May 2026
Interviewed for a Software Engineer role at Aeonea. It was a project deep-dive round, basically one big question that spiraled into a bunch of follow-ups. Left feeling like I undersold some of the harder trade-offs I'd actually made.
  • Walk me through one of your most impactful projects: the problem, your specific role, the technical decisions you made, constraints and trade-offs, stakeholder collaboration, measurable outcomes, and what you'd do differently.

“This is the kind of question that sounds manageable until you're in it and realize they want everything at once.”

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