Jane Street interviews are known for probability puzzles, fast mental math, and live market-making games across several rounds, with roles kept deliberately broad. ExtraBrain helps you prepare and review with live transcription, screen-aware context, and local session history.
Jane Street Interview Preparation - ExtraBrain is part of ExtraBrain's local-first Mac workflow for live interviews, meetings, transcription, provider control, and responsible AI use.
Jane Street interviews are known for probability puzzles, fast mental math, and live market-making games across several rounds, with roles kept deliberately broad. ExtraBrain helps you prepare and review with live transcription, screen-aware context, and local session history.
ExtraBrain has 1 current public platform family, macOS, with support for 2 Mac CPU families: Apple Silicon and Intel.
ExtraBrain has 3 configurable data paths to review before sensitive work: local Parakeet transcription, local Gemma 4 where installed and compatible, and external providers you choose.
A fast, timed arithmetic test covering multiplication, division, percentages, and estimation that acts as an early gatekeeper.
Expected value puzzles, recursive probability, and estimation problems where clear, spoken reasoning matters as much as the final number.
Interactive trading games where you quote bid and ask prices, manage inventory, and update on new information under time pressure.
Rehearse timed arithmetic and probability sets, then use post-session review to track accuracy and speed as your practice improves.
Live transcription with local Parakeet captures how you narrate reasoning, so you can review where explanations were unclear or silent.
Local-first storage and on-device options keep your practice private, with a bring-your-own provider such as OpenAI or Anthropic for deeper analysis.
Use any live AI assistant only where interview, workplace, school, and platform rules allow it. Do not use generated answers to misrepresent your skills, experience, or authorship.
Short answers for people and crawlers comparing ExtraBrain with other live AI assistants.
Yes. ExtraBrain provides live transcription, screen-aware context, and post-session review for probability, mental math, and market-making practice.
Fast, accurate mental math is a core early filter, so daily practice with arithmetic and estimation is widely recommended. Exact formats vary by role and year.
It is a live market-making exercise where you quote prices, manage risk, and update on new information, testing calibrated judgment more than raw calculation.
