Optiver Trader mock interview

Sequences Test (8-min numerical) + 80-in-8 Mental Math (~60-70/80 cutoff) gates the loop. Then market-making games + brainteasers + Superday. Y1 trader $200-350K, Y2-Y3 $400K-$1M+. Olympiad math background heavily over-represented.

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  • ~30 seconds
  • First one free
  • UK & US roles
  • Voice interview + report

Why Optiver Trader is structurally different — Sequences + 80-in-8 are the gates

Per Optiver careers (optiver.com/careers, tools.optiver.com), WallStreetOasis 'Optiver Sequences' thread, QuantNet compilations, Reddit r/quant + r/csMajors candidate posts, Optiver Trader's most distinctive elements are two pre-screening tests: the proprietary Sequences Test (8-min numerical patterns) and the 80-in-8 Mental Math Test. The 80-in-8 alone reportedly eliminates 50%+ of trader applicants. Pass bar ~60-70/80. Most candidates underestimate this — even competition math backgrounds need weeks of daily drilling.

Three signals matter most for Trader screening: (1) mental math speed — 80-in-8 with decimal/fraction conversion fluency drilled to automatic; (2) market-making spread management — composure under interviewer trading against your bid/ask, updating with new information without folding; (3) Dutch directness fit — admit gaps honestly, take direct feedback, defend with logic when challenged, never bluff.

Compensation per Levels.fyi + WSO + Blind: Trader Graduate Y1 $200-350K (base $125-150K + sign-on $50K + guaranteed bonus $75-150K). Y2-Y3 performance bonus uncapped — frequently $400K-$1M+ reported. Comparable to Citadel Securities / Jane Street at junior. STEM degree + olympiad math background is the typical pool, but no finance background required (Optiver trains explicitly).

§ 01What the loop looks like

Round-by-round

  1. 01

    Application + Optiver Sequences Test

    ~8 min · Pre-onsite

    Proprietary 8-min numerical pattern test, ~25 sequences, no calculator. Cutoff aggressive (top ~10-15% reported). This is the FIRST gate — most candidates filtered here.

  2. 02

    80-in-8 Mental Math Test

    8 min · Pre-onsite

    80 arithmetic questions in 8 minutes. Decimals, fractions, negatives. Pass bar widely reported as ~60-70/80 for traders. tools.optiver.com has practice. PRACTICE THIS DAILY before applying.

  3. 03

    First-round video / phone interview

    60 min · Pre-onsite

    Behavioral + brainteasers + market-making game. 'Make me a market on [windows in this building / sum of dice / EV of card draw]'. Spread management graded.

  4. 04

    Superday — Market-making simulation

    60-90 min · Onsite

    Live market-making game with interviewer trading against your bid/ask. Updating prices on observed trades, managing risk on spread, handling adverse selection.

  5. 05

    Superday — Probability + EV

    60 min · Onsite

    Conditional probability, Bayes, Monty Hall variants, 'fair price for this game' problems. Heard On The Street style. Practice probability puzzles with verbal narration before the loop.

  6. 06

    Superday — Poker / Game Theory

    60 min · Onsite

    Poker-flavored game theory. Decision-making under incomplete information. Optiver values poker-style intuition for trading.

  7. 07

    Superday — Behavioral with senior trader

    45-60 min · Onsite

    Dutch directness culture — push back expected. 'Tell me about a time you were wrong' (composure under being wrong-footed). Bluffing flagged immediately.

§ 02Question bank

Real interview questions reported by candidates

  • Mental math

    80-in-8 sample: '0.42 × 1.7', '7/3 + 5/2', '-15 + 8 × 3', '(0.6)²'. Speed at decimal/fraction conversion is the differentiator.

    tools.optiver.com practice site, WSO Optiver compilations

  • Sequences

    Sequences Test sample: identify next number in 'a_n = 2, 6, 12, 20, 30, ...' (n × (n+1)) under 20 seconds. ~25 sequences in 8 min.

    WSO 'Optiver Sequences' thread, QuantNet 2024 threads

  • Market-making

    Market-making: 'Make me a market on the sum of two fair dice.' Standard pattern: bid 6, ask 8 (centered on 7 with width). Then interviewer trades — defend or update spread.

    QuantNet Optiver compilation, WSO Superday reports

  • Market-making

    Market-making with adverse selection: '20-card deck, 19 red and 1 black, draw until you stop. Price the game.' EV computation + spread management + observation updates.

    Heard On The Street style, WSO Optiver

  • Probability

    Probability: 100 prisoners + lightbulb problem. Optimal strategy + expected days to confirm everyone has been visited.

    Heard On The Street, WSO Optiver brainteasers

  • EV

    EV: 'Fair price for this dice game: roll until first 6, get $X = sum of all rolls.' Compute EV explicitly.

    QuantNet Optiver compilation

  • Game theory

    Poker / game theory: 'You and opponent each get a card 1-10 random. Higher wins. Each can bet. Optimal strategy?' Game theory under incomplete info.

    Optiver poker round reports, WSO

  • Behavioral

    Behavioral (Dutch directness): tell me about a time you were wrong about something important. Show composure under being wrong-footed.

    Optiver Life at Optiver content, glassdoor 2023-2025

§ 03Common signals to fix

What gets you rejected at this level

  • Failing 80-in-8 cutoff

    Per WSO + Reddit r/csMajors: 80-in-8 mental math test is most common gate — reportedly eliminates 50%+ of trader applicants. Pass bar ~60-70/80. PRACTICE DAILY for weeks before applying. Use tools.optiver.com practice site. Not a once-and-done — speed at decimal/fraction conversion needs ongoing drilling.

  • Widening / moving market when interviewer 'trades'

    Per WSO Optiver Superday compilations: when interviewer trades against your market, candidates who panic and widen / move their bid/ask reveal they weren't confident in their original prior. Defending with logic OR updating with new information both score; folding under pressure flags weak conviction.

  • Hiding uncertainty / hand-waving probability

    Per multiple WSO + Glassdoor reports: Optiver penalises overclaiming heavily. Saying 'I don't know — let me think about it' scores higher than confident wrong answer. Bluffing on probability is fatal — interviewers calibrate to detect.

  • Cultural arrogance / name-dropping

    Per Glassdoor 2023-2025 reviews: arrogance, name-dropping, or inability to take direct feedback in real time = cultural fail. Optiver Dutch directness expects flat hierarchy + collaborative feedback. Confidence ≠ arrogance — show humility about gaps + reasoning under uncertainty.

  • Generic 'I want to be a quant'

    Optiver distinguishes from Citadel (pod-based aggressive) / Jane Street (intellectual research) / HRT (low-key engineering). Generic 'I want to trade' fails. Reference Optiver's firm-wide P&L (vs pod), Dutch directness culture, market-making focus (vs prop trading or fund management).

How Applr's AI mock interview tracks Optiver's Trader rubric

Applr's Optiver Trader mock simulates the 80-in-8 mental math format — timed arithmetic with decimal/fraction emphasis, drill-style preparation tracking. Sequences-style pattern recognition gets practice prompts before the actual test.

Market-making rounds simulate Optiver's pricing-game format — interviewer trades against your market with adverse-selection scenarios. Composure under being wrong-footed scored explicitly. Behavioral rounds prompt Dutch directness fit — admit-gap framings rewarded over confident-wrong answers.

§ 04Adjacent loops

Related practice

§ 05Questions

FAQ

How do I practice for the 80-in-8 mental math test?

Per Optiver's own practice site (tools.optiver.com): drill DAILY for weeks before applying. Topics: decimal-to-fraction conversion, percentage estimation, negative numbers, multi-step arithmetic. Pass bar ~60-70/80. Most common gate — eliminates 50%+ of applicants per Reddit r/csMajors reports. Don't underestimate — competition math people who haven't drilled mental math still fail this. Use Anki-style spaced repetition on conversion tables (1/7, 1/8, 1/11, etc. as decimals).

What is the Sequences Test really like?

Per WSO 'Optiver Sequences' thread + QuantNet 2024 threads: proprietary 8-min numerical pattern test with ~25 sequences. No calculator. Pattern recognition under aggressive time pressure (top ~10-15% reported pass rate). Cannot prepare beyond IQ-test-style pattern practice. Olympiad math / competitive programming background helps significantly. This is trader-specific — SWE applicants don't take this.

What's Optiver Trader comp?

Per Levels.fyi + WSO + Blind FY2024-25: Trader Graduate Chicago/Amsterdam base ~$125-150K USD, sign-on $50K, first-year guaranteed bonus often $75-150K, total Y1 commonly $200-350K. Performance bonus uncapped — Y2-Y3 traders frequently report $400K-$1M+. Comparable to Citadel Securities / Jane Street at junior; senior trader comp at Optiver generally below Citadel/JS for non-PM trader roles per WSO consensus.

Do I need finance background?

NO per Optiver careers — explicitly trains. STEM degree (math, physics, CS, engineering, quantitative finance) preferred. Olympiad math / competition math background is major plus per WSO consensus. Top universities (TU Delft, Cambridge, MIT, UChicago, NUS, Tsinghua) over-represented but not required. What matters more: mental math speed, probability intuition, ability to update under uncertainty.

Amsterdam vs Chicago vs Sydney — which to target?

All three offer similar Trader role with similar interview process. Amsterdam: Dutch Highly Skilled Migrant visa (generous + fast for new grads), 30% ruling tax benefit (drops to 27% from 2027 for post-2023 recipients), EUR comp lower in absolute but PPP-adjusted competitive. Chicago: H-1B path (lottery), USD comp highest in absolute. Sydney: 482 visa, AUD comp competitive with Chicago. For international students: Amsterdam often most accessible due to generous visa scheme.

What about poker / game theory background?

Helpful but not required. Per WSO + Optiver poker round reports: Optiver values poker-style intuition for trading (decision-making under incomplete information). If you've played poker seriously, mention it. If not, study basic game theory + fundamental poker EV reasoning before the Superday — interviewers notice the framework.

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