Arcesium - interview guide

Arcesium interview questions - a complete guide

Arcesium's technical rounds are reported to go from medium to hard - questions like a shortest path on a grid. Here is preparation for DSA, Java and design.

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About Arcesium

Arcesium builds a data and operations technology platform for hedge funds and asset managers - trades, positions, accounting. It started within the D. E. Shaw group. It has large centres in Hyderabad and Bengaluru.

This guide covers 12 Arcesium interview questions with answers - what each question checks and how to answer it - plus the Arcesium interview process, round by round, a 7-day preparation plan for freshers, tips and the mistakes to avoid.

Arcesium hiring process

  1. Online test

    Reported: 3 medium coding questions.

  2. Technical round 1

    One medium and one hard problem.

  3. Technical round 2

    Hard DSA (such as Dijkstra on a grid), OS, Java and SQL.

  4. Hiring manager

    System design and projects.

Arcesium does not publish its India fresher interview process in detail (as of our check). This is based on candidate reports - many of them for experienced roles, so the fresher process can differ. Confirm with the recruiter.

Sources (checked 16 October 2026): Arcesium Careers. Hiring processes change - read the official notice before you apply.

Arcesium interview questions and answers

DSA

  1. 1.Each grid cell has a cost - the cheapest path from the top-left to the bottom-right (moving in all four directions).

    What they're checking
    Dijkstra on a grid has been reported.
    How to answer
    With four directions, simple DP doesn't work (cycles). Treat cells as nodes and run Dijkstra - (cost, r, c) in a min-heap. O(mn log mn).

  2. 2.Find the maximum of every window of size K with a deque.

    What they're checking
    A monotonic deque.
    How to answer
    Indices in a deque with values decreasing. When a new one comes, drop smaller ones from the back; drop the out-of-window one from the front; the front is the max. O(n).

  3. 3.The shortest path from one word to another, changing one letter at a time (through dictionary words).

    What they're checking
    Graph BFS.
    How to answer
    Each word a node; a one-letter difference = an edge. Levels with BFS. To go faster, group words by pattern (h*t).

  4. 4.Match trades from two systems (reconciliation) - which ones differ?

    What they're checking
    Arcesium's real work.
    How to answer
    A hash map by trade ID (or key fields); compare records from both sides - only on one side, or different fields (quantity, price). Three buckets in the report.

Java, OS and SQL

  1. 5.What is the difference between volatile and synchronized in Java?

    What they're checking
    Concurrency.
    How to answer
    volatile only gives visibility - what one thread writes is seen by another at once; it isn't atomic (count++ isn't safe). synchronized gives both visibility and one-thread-at-a-time (mutual exclusion).

  2. 6.Why use an ExecutorService in Java instead of a new Thread() for every task?

    What they're checking
    Practical concurrency.
    How to answer
    Creating threads is expensive; a thread pool reuses threads, limits their number and returns results/errors through a Future. Always call shutdown() at the end.

  3. 7.How does copy-on-write save memory after fork()?

    What they're checking
    OS.
    How to answer
    Parent and child share the same pages at first (marked read-only). A page is copied only when one of them writes - not the whole memory.

  4. 8.SQL: the net quantity (buy - sell) of each security in each fund.

    What they're checking
    Positions - domain SQL.
    How to answer
    GROUP BY fund_id, security_id, SUM(CASE WHEN side = 'BUY' THEN qty ELSE -qty END). Ask whether zero positions should be shown.

Design and HM

  1. 9.Design a system that computes P&L (profit/loss) from millions of trades at end of day.

    What they're checking
    Hiring manager system design.
    How to answer
    Ingest trades and prices, update positions, P&L per position (realised + unrealised), parallel batches by fund, checkpoints, and reconciliation of the numbers. The deadline is before morning.

  2. 10.What does Arcesium do, and how is it related to D. E. Shaw?

    What they're checking
    Understanding the company.
    How to answer
    A back/middle office platform for investment firms - trades, positions, accounting, data. It started within the D. E. Shaw group and now serves clients as a separate company.

  3. 11.Tell me about a hard problem where you changed your approach after a hint.

    What they're checking
    Coachability.
    How to answer
    What you were thinking first, what the hint was, and how you moved to the new path - not ego, learning.

  4. 12.Why Arcesium?

    What they're checking
    Motivation.
    How to answer
    Hard problems in finance and data, and the level of engineering - specific.

7-day preparation plan for the Arcesium interview

  1. Day 1: Graphs - Dijkstra on a grid, BFS.
  2. Day 2: Sliding window maximum, deques, heaps.
  3. Day 3: Hard problems - two, timed.
  4. Day 4: Java concurrency + OS.
  5. Day 5: SQL - positions, aggregation.
  6. Day 6: Design - EOD batch, reconciliation.
  7. Day 7: A full mock (medium + hard) + hiring manager.

Preparation tips

  • Hard DSA - Dijkstra variants, monotonic deques, BFS.
  • Java concurrency and OS basics.
  • SQL aggregation on finance data.
  • Batch processing and reconciliation in design.

Mistakes to avoid

  • Applying DP to a grid with four directions.
  • Treating volatile as a thread-safe counter.
  • Not even stating the brute force on a hard problem.

Frequently asked questions

What is in the Arcesium online test?

According to reports, 3 medium coding questions.

How hard is the Arcesium interview?

The technical rounds are reported to go from medium to hard - such as Dijkstra on a grid.

Where is Arcesium in India?

Large centres in Hyderabad and Bengaluru.

What happens in the Arcesium hiring manager round?

According to reports, system design and projects.

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