Reasoning
Structure uncertain problems, state assumptions, quantify trade-offs, and update when evidence changes.
Evidence: timed math, probability, and decision work
01
Public signals
02
Capability standard
03
Evidence loop
01 / Thesis
Jane Street is a North Star, not a borrowed identity.
The objective is not to imitate a logo or claim equivalence. It is to translate visible expectations into capability contracts, pressure-test them, and produce evidence that survives technical questioning.
02 / North Star standard
One specification across six capabilities
A PJS preparation standard derived from recurring public signals. Every capability must become observable work, not vocabulary.
Coding
Translate thought into clear programs, debug from first principles, and explain complexity and failure modes.
Evidence: independent implementation under reviewQuant research
Connect data, features, signals, positions, costs, evaluation, and research boundaries without hiding gaps.
Evidence: reproducible research and attributionProduction
Design for reliability, observability, recovery, ownership, and the consequences of real operation.
Evidence: tests, monitoring, incidents, and runbooksCommunication
Make technical reasoning concise, collaborative, and useful across research, trading, and engineering.
Evidence: live defense, writing, and feedbackIntellectual honesty
Separate facts from inference, disclose uncertainty, admit mistakes quickly, and improve the system.
Evidence: calibrated claims and documented revisions03 / Visible system
One firm-wide problem-solving loop
A PJS inference from repeated language across official role descriptions. It is not an internal reporting chart.
01Market / business problemFind the consequential question.
02Reason + experimentData, models, counterfactuals.
03Build + productionizeTools, systems, connectivity.
04Trade + operateExecution, clients, controls.
05Learn + improveFeedback, teaching, iteration.
Trading, Research & ML
Signals, experiments, pricing, models, strategies, execution, and risk.
Technology
Software, ML platforms, Linux, networks, market connectivity, and compute.
Strategy & Product
Cross-functional analysis, process design, priorities, and delivery.
Institutional
Client needs, products, execution, regional coverage, and feedback.
Finance & Operations
Financing, reporting, tax, controls, constraints, and automation.
04 / Hong Kong role atlas
Read by stage and system layer
Availability changes. Each card links to the official source captured for this snapshot.
05 / What seniority reveals
Internship
Mentorship, classes, real projects, simulation, broad exposure.
Signal: learning velocityNew graduate
Strong foundations, guided responsibility, precise reasoning, collaboration.
Signal: potential with rigorExperienced
Domain depth, production ownership, platform improvement, cross-team delivery.
Signal: demonstrated leverage06 / Evidence gates
A capability is real only when it survives the next gate.
PJS does not publish arbitrary readiness scores. Progress is measured through observable artifacts, pressure tests, and revisions.
Explain
Recover the idea, assumptions, interfaces, and boundaries without hiding behind terminology.
Implement
Produce the core logic independently and make the design choices explicit.
Test
Challenge correctness, edge cases, leakage, robustness, and failure behavior.
Operate
Show how the work is configured, observed, recovered, and maintained.
Defend
Survive follow-up questions, alternatives, trade-offs, and a live change request.
07 / Repeated hiring signals
- 01Reason clearly under uncertainty.
- 02Learn quickly without pretending to know.
- 03Turn thought into working code and systems.
- 04Communicate precisely across specialties.
- 05Connect local work to firm-wide outcomes.
- 06Own production, feedback, and improvement.
08 / Evidence boundary
Official sources first.
PJS uses official Jane Street public pages as primary evidence. Organization maps are labeled as inference. Private strategies, internal reporting lines, exact headcount, compensation, and unpublished systems remain unknown.
Open official Hong Kong roles Open official Hong Kong office page