Working at Simplex | Glassdoor

Simplex Overview

Chicago, IL
51 to 200 employees
Company - Private
Unknown / Non-Applicable
Simplex Investments is a growing, Chicago-based proprietary trading firm that leverages capital, trading intelligence, and exceptional technological resources in a dynamic, results-driven atmosphere with a focus on innovation and learning.

Simplex Reviews

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Erik Swanson
8 Ratings
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    "Good Experience"

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    Former Employee - Software Developer in Chicago, IL
    Former Employee - Software Developer in Chicago, IL
    Positive Outlook
    Approves of CEO

    I worked at Simplex full-time (More than 3 years)


    * You start becoming productive on day one. There is no drawn out onboarding process. You start writing and committing code right away. The transition is smooth yet definite.
    * The team has some really smart engineers who perform at a very high level. It is surprising how every developer does so many different things and does it well.
    * You get total ownership of your projects and you mostly have complete autonomy on how to go about it and there is always help if you need
    * Good production monitoring system


    * The developer workflow tools/platform could use some upgrading
    * Emacs not installed on all machines by default (LOL, j/k)

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Simplex Interviews

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Interview Experience

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Getting an Interview

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Interview Difficulty




    Trader Interview

    Anonymous Interview Candidate in Chicago, IL
    Declined Offer
    Negative Experience
    Easy Interview


    I applied online. I interviewed at Simplex (Chicago, IL) in April 2016.


    logic test. Asked a bunch of math/brain teasers. The questions are very simple and stupid. I will not do it again. Questions are generally high school level. The person administrate the test is very stupid.

    Interview Questions

    • math/IQ test questions. Questions are generally high school level. The person administrate the test is very stupid.   Answer Question
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Company Updates

  • Want to look at raw exchange data? Want some test data for your low latency order book?

  • Would you have made these optimizations? Come work at Simplex.

    How does grep run so fast?

    To add to Steve's excellent answer. It may not be widely known but grep is almost always when grepping for a pattern-string than a short one, because in a longer pattern, Boyer-Moore can skip forward in longer strides to achieve even better speeds: Example: # after running these twice to ensure apples-to-apples comparison # (everything is in the buffer cache) $ time grep -c 'tg=f_c' 20140910.log 28 0.168u 0.068s 0:00.26 $ time grep -c ' /cc/merchant.json tg=f_c' 20140910.log 28 0.100u 0.056s 0:00.17 The longer form is 35% faster!

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