Process
The interviewer spoke with me over the phone and used HackerRank to assess my coding skills. The conversation was somewhat casual, with the interviewer asking questions to get to know me, in addition to testing my technical knowledge.
50% Behavioral, 50% Technical.
It wasn't overly challenging, but it seemed they were more focused on my thought process.
Questions
You are given an array of integers, a1, that contains sequential integers from 1 through n. For example: { 1, 2, 3, 4, 5 } or { 1, 2, 3 }.
You are also given an array of integers, a2, that also contains numbers from 1 through n. However, these numbers are not in sequential order and one number between 1 and n is missing.
Find the missing number in a2.
Did you check for special cases? Can you do this in O(n) runtime?
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Interview Statistics
The following metrics were computed from 30 interview experiences for the Redfin Software Developer role in United States.
Success Rate
Redfin's interview process for their Software Developer roles in the United States is very selective, failing most engineers who go through it.
Experience Rating
Candidates reported having very good feelings for Redfin's Software Developer interview process in United States.
Redfin Work Experiences
- 5.0Great!Software Developer • Current EmployeeSeattle, WANovember 3, 2012Pros: Friendly people, great culture, up-potential, and lots of perks and events.Cons: Some growing pains around transitioning from a small to a large engineering org. It is not really a con, but an interesting time with lots of opportunity to make it an even better place.
- 4.0People are very nice. Feels like management is constantly gaslighting you.Software Developer • Former EmployeeMay 8, 2020Pros: Good benefits. The rank and file are nice people.Cons: Constant lip service is paid to egalitarian company values, but decisions are made in a top-down manner, which results in confusion, wasted work, and dropped projects. The Dunning-Kruger effect is high among managers. The peer review process. The CEO lied to the company about jobs being safe before a mass layoff. Uneven hiring makes it difficult to trust the quality of other developers.
- 4.0Great culture and opportunities, but instability persistsSoftware Developer • Current EmployeeSeattle, WAOctober 27, 2026Pros: Absolutely love the culture and career opportunities given if you push.Cons: It has been tumultuous with acquisitions and layoffs.
Redfin Interview Questions
