AlphaGrep interview process (2026)

Round-by-round breakdown of the AlphaGrep software engineering interview across 3 levels and 15 rounds: interview mode, sample questions, and worked solutions.

AlphaGrep salary & ratings · All interview processes

Software Developer — C++ Low Latency (New Grad / Campus)

Difficulty: Hard · Timeline: ~2-4 weeks · Recommended prep: 8-12 weeks · Cooldown: ~6 months

  1. Round 0: Online Assessment (HackerRank, C++ only)

    Assessment · ~60-90 min · difficulty 3/5 · elimination round

    Mode of interview: Online assessment · HackerRank

    Sample question: Trade blotter PnL — You receive N executed trades for one symbol, each line 'BUY|SELL qty price' in time order (long-only: sells never exceed open quantity). Print the final OpenPosition (net quantity), RealizedPnL matching sells against buys FIFO, and OpenValue = open quantity times last traded price. This is a real AlphaGrep round-2 prompt (OpenPosition/NetProfit/Value from buy-sell transactions) that also appears as an OA-style exercise.

  2. Round 1: Technical Round 1 — DSA + C++ Core

    Onsite · ~45-60 min · difficulty 4/5 · elimination round

    Mode of interview: Onsite or virtual onsite interview

    Sample question: Streaming median — Prices arrive one per line from a market-data feed. After each new price, print the median of all prices seen so far (one decimal place). Target O(log n) per update. Follow-up: how would your structure change if you also needed to delete stale prices older than a time window?

  3. Round 2: Technical Round 2 — OS, Networks & Architecture

    Onsite · ~45-60 min · difficulty 4/5

    Mode of interview: Onsite or virtual onsite interview

    Sample question: Walk through everything that happens, memory-wise, when a C++ program calls new for a 1 MB buffer and then reads it sequentially: allocator behavior, brk/mmap, page faults, TLB fills, and cache-line effects. Then: why does an HFT feed handler prefer UDP multicast over TCP, and what does the application have to handle itself as a result (loss, ordering, gap recovery)?

  4. Round 3: Order Book Design Round

    System_design · ~60 min · difficulty 5/5

    Mode of interview: Live system design interview

    Sample question: Design an order book supporting: add limit order (side, price, qty), cancel by order id, best bid/ask query, and total volume at a price level — each in O(log n) or better. Extend it to a dashboard that streams the top 5 levels per side after every event. What changes if 90% of events are cancels near the touch?

  5. Round 4: HR / Fit Chat

    Behavioral · ~30 min · difficulty 1/5

    Mode of interview: Live behavioral interview

Quantitative Researcher (Entry / Campus)

Difficulty: Hard · Timeline: ~2-4 weeks · Recommended prep: 8-12 weeks · Cooldown: ~6-12 months

  1. Round 0: Online Assessment — Coding + Probability (C++)

    Assessment · ~90 min · difficulty 3/5 · elimination round

    Mode of interview: Online assessment

    Sample question: Two-trade max profit (DP) — Given N daily prices of a stock, compute the maximum total profit using at most two non-overlapping buy-sell transactions (you must sell before buying again). O(N) time, O(1) extra space. Input: N then N prices; output the max profit.

  2. Round 1: Technical Round 1 — Stats, Resume & Light DSA

    Onsite · ~45-60 min · difficulty 3/5

    Mode of interview: Onsite or virtual onsite interview

    Sample question: You roll two fair dice and are told the sum is 8. What is the probability at least one die shows a 6? Follow-ups: how do mean and median of a return series respond to one extreme outlier, and what is the Sharpe ratio actually measuring?

  3. Round 2: Probability & Puzzles Round

    Onsite · ~60 min · difficulty 5/5 · elimination round

    Mode of interview: Onsite or virtual onsite interview

    Sample question: For which real values of x does the infinite power tower x^x^x^... converge, and what does it converge to at the boundary? Then a strategy puzzle: 100 opaque boxes, one contains a prize; each day you open one box and are told 'higher or lower'-style feedback — design a strategy minimizing expected days.

  4. Round 3: Market Making Simulation

    Other · ~45-60 min · difficulty 4/5

    Mode of interview: Interview format varies by team

    Sample question: Make a market on the sum of two dice: quote a bid and an ask. The interviewer may trade against you, then reveals one die is a 6 — requote. Explain how your spread reflects variance and how your quotes shift as your inventory grows long.

  5. Round 4: HR / Team Fit

    Behavioral · ~30 min · difficulty 1/5

    Mode of interview: Live behavioral interview

Senior C++ Developer — Low Latency (Experienced, 2-7 YOE)

Difficulty: Hard · Timeline: ~4-6 weeks · Recommended prep: 6-10 weeks · Cooldown: ~6-12 months

  1. Round 0: Recruiter / Hiring Manager Screen

    Phone · ~30 min · difficulty 1/5 · elimination round

    Mode of interview: Remote phone or video interview

  2. Round 1: Coding Round — DSA in C++

    Onsite · ~60 min · difficulty 4/5 · elimination round

    Mode of interview: Onsite or virtual onsite interview

    Sample question: Top-of-book tracker — Process N operations on a limit order book: 'A id side price qty' adds an order (side B or S), 'C id' cancels it. After every operation print best bid as priceXqty and best ask as priceXqty (or - if empty). Aggregate quantity per price level; cancels must be O(log n).

  3. Round 2: C++ Internals + OS Deep Dive

    Onsite · ~60 min · difficulty 5/5

    Mode of interview: Onsite or virtual onsite interview

    Sample question: A hot path calls a virtual function on a shared_ptr member in a tight loop. Enumerate every source of latency (atomic refcount, vptr load, indirect call, i-cache and branch predictor effects), then redesign: CRTP or variant for dispatch, raw pointer in the loop, data laid out per cache line. When would std::memory_order_relaxed be safe for a sequence counter shared with one reader thread?

  4. Round 3: Low-Latency System Design

    System_design · ~60-75 min · difficulty 5/5

    Mode of interview: Live system design interview

    Sample question: Design a feed handler for an exchange multicast feed: normalize increments into a limit order book and publish top-of-book to 10 strategy processes with p99 wire-to-strategy latency under 5 microseconds. Cover socket strategy, threading and core pinning, book data structures, seq-gap recovery via the snapshot feed, and slow-consumer handling on your outbound queue.

  5. Round 4: Hiring Manager / Culture Round

    Behavioral · ~45 min · difficulty 2/5

    Mode of interview: Live behavioral interview

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Worked sample solutions (code, design diagrams, and STAR answers) for every round are available in the FAANGPlus app: open interview processes.