This guide draws on 10 first-hand interview accounts from Hacker News. Candidates describe about 1 round on average, most often technical interviews, a take-home task and job shadow.
These 10 writeups cover software engineering roles. All of them were posted under a forum handle, so we could not verify the authors’ identities.
unknown. 1 round. Shared by wk_end on hn, 2020-08-25
1Technical interviewsTechnicalAn extremely exhausting battery of interviews, among the hardest in the industry, far more intense than a comparable interview at Google taken the next day.
Role not stated
Not selected
unknown. 1 round. Shared by gaius on hn, 2018-08-10
1Onsite roundsTechnicalReached onsite. OCaml never came up during the process.
Role not stated
Outcome not shared
unknown. 1 round. Shared by yodsanklai on hn, 2022-09-23
1InterviewsTechnicalMath and logic puzzles. No OCaml questions.Covered: Math, Logic puzzles
Software Engineer
Not selected
unknown. 4 rounds. Shared by knaik94 on hn, 2022-11-10
1Take-home assessmentsTake-homeTwo take-home assessments among roughly five rounds before the on-site.
2Pre-onsite roundsTechnicalSeveral further screening rounds preceded the on-site invitation.
3Superday coding interview 1TechnicalIn-person coding problem requiring a mostly complete working solution, with pseudocode written first.Covered: Pseudocode first, Working implementation, Edge cases
4Superday coding interview 2TechnicalA harder technical coding interview held after lunch.Covered: Advanced coding
Role not stated
Outcome not shared
unknown. 1 round. Shared by silverlake on hn, 2022-08-02
1Office tourJob shadow / site visitMid-interview tour of a densely packed trading floor.Covered: Work environment
Role not stated
Not selected
unknown. 1 round. Shared by owl_vision on hn, 2025-06-28
1Technical interviewTechnicalC++ questions and whether the candidate would learn OCaml. The role went to someone who already knew it.Covered: C++, OCaml
Role not stated
Not selected
Internship. 1 round. Shared by filoleg on hn, 2022-09-07
1Internship interviewTechnicalCampus-recruited internship interview that tested combinatorics and algorithms.Covered: Combinatorics, Algorithms
Role not stated
Not selected
unknown. 1 round. Shared by jolux on hn, 2020-08-25
1OnsiteTechnicalCompleted the onsite and received a verbal offer that was withdrawn during pay discussions.
Role not stated
Received an offer
unknown. 1 round. Shared by paulgb on hn, 2020-08-25
1Technical interviewsTechnicalPaired interviewers and deeper implementation problems than typical big-tech rounds, such as writing a garbage collector across the whiteboard walls.Covered: Garbage collection, Systems implementation, OCaml
Role not stated
Not selected
unknown. 1 round. Shared by Chyzwar on hn, 2020-03-26
1Technical interviewTechnicalTechnical round the candidate felt was well structured but did not pass.
What is the interview process like at Jane Street?
This guide draws on 10 first-hand interview accounts from Hacker News. Candidates describe about 1 round on average, most often technical interviews, a take-home task and job shadow.
What topics does Jane Street test in interviews?
Commonly reported topics include OCaml, Math, Logic puzzles, Pseudocode first, Working implementation, Edge cases.
These guides summarize public, first-hand interview experiences shared by candidates. They describe the shape of each loop and the topics that came up, not a leaked question bank, and every experience links back to its original source. Processes change often. Treat this as directional prep, not a script.
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