Prop Firm Interview Process: What to Expect at Every Stage
A complete walkthrough of the prop firm interview process — from online assessments through superday — with timelines, what each stage tests, and how to prepare for each round.
Prop Firm Interview Process: What to Expect at Every Stage
The prop firm interview process is unlike anything in software engineering, consulting, or investment banking. It moves fast, tests unusual skills, and often has 4–6 distinct rounds before an offer. Most candidates go in without knowing what to expect — and are eliminated in round 1 because of it.
This guide walks through every stage in detail: what they test, how long each takes, and what you need to do to advance.
Overview: The Typical Timeline
From first contact to offer: typically 6–12 weeks. Here's the usual sequence:
- Application / Recruiter screen (1–2 weeks)
- Online assessment (1 week to complete)
- Phone screen (1–2 sessions, 30–60 min each)
- Onsite / Superday (4–8 hours, often 1 day)
- Offer and negotiation (1–2 weeks)
Some firms compress this (Jane Street moves very fast once they're interested). Others stretch it (hedge funds may take 3+ months). Optiver's process is known for being especially fast.
Stage 1: Application and Recruiter Screen
Getting the Conversation Started
Most top prop firms don't recruit heavily on LinkedIn. The best paths:
- On-campus recruiting (Optiver, Jane Street, SIG all recruit heavily at target universities)
- Referrals (by far the highest conversion rate)
- Direct application (low conversion but non-zero, especially with a strong background)
- Career fairs (HRT, DRW, Akuna all attend major CS/math career fairs)
Target schools: MIT, Caltech, CMU, Princeton, Harvard, Stanford for the research/quant tracks. Strong regional schools (UIUC, Michigan, UT Austin) for trading and engineering roles.
The Recruiter Screen
Usually 20–30 minutes. The recruiter is assessing:
- Academic background (major, GPA, relevant coursework)
- Why trading/prop firm specifically
- Relevant experiences (quantitative projects, coding, competition math)
Common question: "Tell me about yourself." Your answer should hit: (1) quantitative background, (2) why trading/markets, (3) something concrete you've done that's relevant.
What stands out: Competition math (AMC/AIME/USAMO), quantitative research, trading experience, programming. Finance experience matters much less than math and coding.
Stage 2: Online Assessments
Most firms have at least one online assessment before bringing you in for human interviews.
Mental Arithmetic Test
Who uses it: Optiver (the famous 80-in-8), Jane Street (embedded in their process), SIG.
What it tests: Pure arithmetic speed. Multiplication, percentages, fractions, square roots — no calculator, strict time limit.
Optiver's 80-in-8: 80 questions in 8 minutes. Passing threshold ≈ 53–60 correct. Preparation time required: 8–12 weeks of daily drilling.
Preparation: See the mental math speed training guide. This is the most time-sensitive prep — start immediately after you decide to apply.
Probability and Logic Assessment
Who uses it: Jane Street, HRT, D.E. Shaw (often as a written take-home).
What it tests: Probability problems, pattern recognition, logical reasoning. Sometimes includes short coding problems.
Format: Usually 45–90 minutes, multiple choice or short answer, completed online.
Example questions:
- "A fair coin is flipped 10 times. What's the probability of exactly 5 heads?" (C(10,5)/2¹⁰ ≈ 24.6%)
- "You roll two dice. What's the expected value of the maximum?" (Expected value ≈ 4.47)
- Logic puzzles (knights/knaves, hat problems)
Preparation: Fermiq's probability category and the 30 probability problems guide.
Coding Assessment
Who uses it: HRT, D.E. Shaw (always), Two Sigma, Citadel (for engineering roles).
What it tests: Algorithm implementation, data structures, problem-solving efficiency.
Format: 2–4 problems in 90–120 minutes on HackerRank, CoderPad, or similar. Language: usually Python or C++.
Preparation: LeetCode Medium-Hard. HRT expects near-competitive-programming level; Two Sigma is less extreme but still hard. Target 150+ problems before applying.
Written Quantitative Test
Who uses it: D.E. Shaw (take-home), Goldman Sachs Strats, some hedge funds.
What it tests: Deep mathematical reasoning. Problems may take hours; you're expected to explain your work clearly.
Format: 5–10 open-ended questions, returned within 24–48 hours.
Example: "Derive the expected number of steps in a random walk to return to the origin" or "Design a method to estimate this integral..."
Preparation: Graduate-level probability and statistics; mathematical maturity matters more than knowing specific facts.
Stage 3: Phone/Video Interviews
Human interviews begin here. 1–3 sessions, 30–60 minutes each.
What Gets Tested
Probability and EV: Classic problems asked in real time. You must explain your reasoning out loud, not just give the answer.
Mental arithmetic follow-ups: After a mental math test, some firms ask arithmetic questions verbally to ensure you can compute under pressure with someone watching.
Markets knowledge: "What's the S&P 500 trading at?" or "Estimate the market cap of NVIDIA." Order-of-magnitude questions.
Trading game: A simplified version of a trading exercise. "I'll tell you two dice rolls, you give me a bid/ask on the sum." Tests real-time probabilistic updating.
Common Phone Screen Questions by Firm
Jane Street: Expected value problems, conditional probability, combinatorics. "A bag has 3 red and 5 blue balls. You draw 2 without replacement. What's P(both red)?"
SIG: EV in poker-style scenarios. "You're in a $100 pot. Probability of winning is 40%. You can bet $0 to $50. How much do you bet and why?"
HRT: Algorithm problems. "Implement binary search. What's its time complexity when the array has duplicates and you want the leftmost occurrence?"
Two Sigma: Statistics. "What is p-value? What does it mean for a trading strategy?"
How to Perform in Phone Screens
Think out loud. Don't go silent to calculate. Interviewers want to hear your reasoning process, not just the answer.
State your approach before computing. "I'm going to use conditional probability / linearity of expectation / a recursive setup..." Then execute.
If you're stuck: Say so, and try a simpler version of the problem. "Let me think about the n=2 case first." This is professional behavior; going silent is not.
Check your answer. After computing, take 2–3 seconds to verify: does this make sense? Is it in [0,1] for a probability? Is the order of magnitude right for an estimation?
Stage 4: The Onsite / Superday
The superday is the most intensive part. Typically 4–8 hours with 4–8 interviewers. Everything is tested.
Common Structure
Morning: Technical interviews (2–3 sessions)
- Probability and EV problems (harder than phone screen)
- Mental arithmetic under observation
- Trading exercises and games
Midday: Break / firm tour
Afternoon: Advanced technical + team-specific (2–3 sessions)
- Markets intuition and estimation
- Role-specific depth (options for trading, algorithms for engineering, statistics for research)
- One-on-one with a senior trader or researcher
End: Behavioral (1 session)
- Why trading? Why this firm?
- Describe a hard problem you solved
- How do you handle being wrong?
The Trading Exercise
Almost every prop firm onsite includes a live trading game. Common formats:
Number guessing: The interviewer has a number. You can bid/ask on what it is. You must quote a spread — too wide and you never trade; too tight and you lose money when wrong.
Dice game: Roll dice, quote bid/ask on outcomes or sums. Update your market as information arrives.
Card game: Draw cards from a shuffled deck. Make markets on the count of red/black cards, the sum of the deck, or other properties.
What they're evaluating:
- Do you maintain discipline (quote spreads, not just midpoints)?
- Do you update your market quickly when information arrives?
- Can you think about risk and adverse selection in real time?
- Are you competitive but not reckless?
Preparation for Trading Exercises
The best preparation is partner practice. Sit with a friend:
- Friend has a random number (1–100), you make markets until you're right within ±5.
- Friend draws cards, you make markets on the running count.
- Practice updating your bid/ask smoothly — "I'm trading at 45/55, and I just saw that you're willing to buy at my ask, so I'll move my market up to 50/60."
Behavioral Questions
Prop firm behavioral questions are more specific than typical:
"Why trading specifically?" Not: "I love math and finance." Better: "I want to be in an environment where I can quantify every decision, see immediate feedback on whether I was right, and compound my skills over time. The combination of quantitative reasoning and real-time decision-making is exactly what I want."
"Tell me about a time you were wrong." Must be genuine. Show you updated quickly, didn't overreact, and learned specifically. "I modeled X incorrectly because I assumed Y. When I saw the result, I immediately recalculated and found Z. Now I always check Z first."
"What's your edge?" They're asking what makes you different. Don't be generic. Point to a specific skill or experience.
Stage 5: Offers and Negotiation
Timelines
- Optiver, Jane Street: Very fast. Offer within 1–2 weeks of superday. Sometimes the next business day.
- Two Sigma, D.E. Shaw: Can take 2–4 weeks post-superday.
- Hedge funds (multi-manager): Weeks to months; much less standardized.
Negotiating
Yes, you can negotiate at prop firms. The firms that have the most room to negotiate:
- Signing bonus (most flexible)
- Start date (usually flexible)
- First-year guarantee (rarely, but possible at some hedge funds)
- Base salary (least flexible, especially at firms with uniform new-grad comp structures)
The best leverage: A competing offer from a comparable firm. "I have an offer from [Firm X] for $Y. Is there flexibility here?" is much stronger than a generic ask for more.
Don't delay accepting to fish for more: Firms have exploding offer deadlines (typically 2–4 weeks). Asking for an extension once is acceptable; more than once is not.
How Long Does Preparation Take?
This depends on your starting point, but general guidelines:
| Background | Minimum prep time |
|---|---|
| Strong math/CS student, limited interview prep | 8–10 weeks |
| Some quant/coding background | 6–8 weeks |
| Prior finance/trading experience | 4–6 weeks |
| No math or programming background | 16+ weeks |
The most common mistake: starting too late. If you're targeting a firm with an online assessment, that test alone requires 8+ weeks of daily drilling to pass reliably.
Build the foundational skills before the process starts. Fermiq's daily drill is the most efficient way to develop the quantitative intuition that runs through every stage of the prop firm interview process.