Full-Time

Software Engineer

Simplex Trading

Simplex Trading

Proprietary trading firm leveraging advanced tech

Compensation Overview

$125k - $200k/yr

+ Discretionary Bonus

Chicago, IL, USA

In Person

Category
Software Engineering (1)
Required Skills
Java
C#
C/C++
Linux/Unix
Requirements
  • 4+ years experience working with a high level language (e.g., C++, Java, C#)
  • Linux/Unix exposure
  • Computer science or engineering degree or real world experience
Responsibilities
  • Work on our system from trading algorithm development, to high speed data analysis, and intelligent execution engine design
  • Design, build, and maintain efficient, reusable, and reliable C++ code on Linux
  • Other opportunities as assigned
Desired Qualifications
  • Some C++ experience
  • Previous financial industry experience

Simplex Trading is a technology-driven proprietary trading firm that builds its own software and trading systems to identify and capitalize on financial opportunities. It develops and optimizes trading strategies for various markets using algorithms and automation. The company differentiates itself by maintaining an in-house team of technologists and data-driven traders, building a scalable tech stack rather than relying on third-party platforms. Its goal is to generate growth and opportunity in technology-enabled markets through disciplined execution and continuous improvement of its trading software and methods.

Company Size

N/A

Company Stage

N/A

Total Funding

N/A

Headquarters

N/A

Founded

N/A

Simplify Jobs

Simplify's Take

What believers are saying

  • Strategic hires like Benjamin Londergan drive business development and growth initiatives.
  • Heavy tech sector positioning captures upside from NVDA, AAPL, and semiconductor strength.
  • Venture capital investments in early-stage fintech and technology startups generate alpha.

What critics are saying

  • Massive SPY put concentration (16.73% of $177B) risks unlimited losses on market rallies.
  • SEC Reg SCI amendments force unwinding of options positions, triggering $2–5B losses.
  • Citadel Securities dominates equity options market share, eroding Simplex's liquidity revenue.

What makes Simplex Trading unique

  • Technology-driven proprietary market maker founded in Chicago in 2004.
  • Portfolio achieved 186.93% annualized return, significantly outperforming S&P 500.
  • Diversified across computer (23.09%), electronics (20.28%), and medical biology sectors.

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Benefits

Health Insurance

Dental Insurance

Vision Insurance

401(k) Company Match

Parental Leave

Tuition Reimbursement

Employee Discounts

Charity Match

Meal Benefits

Company Social Events

Company News

ETF Daily News
Sep 24th, 2025
VanEck High Yield Muni ETF $HYD Shares Sold by CX Institutional

Finally, Simplex Trading LLC purchased a new stake in VanEck High Yield Muni ETF in the 1st quarter valued at approximately $40,000.

Finance Magnates
Jun 10th, 2024
Prop Firm Simplex Trading Welcomes Seasoned Veteran as New Managing Director

A financial and trading industry veteran with over 25 years of experience, Benjamin Londergan, joined Simplex Trading in June as the Managing Director of Strategic Business Development.

Business Wire
Feb 7th, 2024
Spline Data Announces Successful Release Of Real-Time Predictive Municipal Bond Pricing Product

CHICAGO--(BUSINESS WIRE)--Spline Data, a quantitative U.S. municipal bond data provider, today announced the successful release of its second municipal bond data product that provides real-time bid/ask pricing estimates to its growing list of customers. Spline’s new pricing data feed aims to utilize every trade in the municipal market—similar to its yield curves launched in 2023—and in contrast to traditional data feeds skewed toward institutional round lots. Updating every five minutes, Spline’s pricing feed offers a plug-and-play solution for building automation into municipal trading strategies. “As in many other markets, most of the software needed to trade municipal bonds in an automated fashion is available off the shelf, but a critical missing piece has, until now, eluded most desks: algo-quality pricing,” said Matthew Smith, founder and CEO of Spline Data. “In the past year, we’ve seen firsthand how quickly Spline customers’ businesses evolve utilizing our curves alone

MarketBeat
Feb 3rd, 2024
Veradigm (NASDAQ:MDRX) Research Coverage Started at StockNews.com

Simplex Trading LLC purchased a new stake in Veradigm in the 2nd quarter worth approximately $38,000.

The Manchester Times
Jan 13th, 2024
Built In Honors Simplex Trading in Its Esteemed 2024 Best Places to Work Awards

Simplex Trading, a leading technology-driven, proprietary trading firm and one of the country's top market makers in equity options, today announced that it has been honored in Built In's 2024 Best Places To Work Awards.