---
title: 'Infrastructure Engineer at Simplex Trading'
canonical: 'https://feeny.ai/job/infrastructure-engineer-simplex-trading-chicago-8z7w7xhnxjr3'
type: 'job'
last_seen: '2026-09-10'
---

# Infrastructure Engineer at Simplex Trading

- **Company:** Simplex Trading
- **Location:** Chicago, IL
- **Compensation:** $125k–$200k
- **Posted:** 2026-04-10
- **Last confirmed live:** 2026-09-10
- **Apply:** https://job-boards.greenhouse.io/simplextrading/jobs/5185304008

## Job description

Our employees are our greatest asset. We have spent years building a team of talented, dedicated technologists, data-driven traders, and expert leaders with an emphasis on our core pillars: People, Process, Trading Edge, and Technology. Simplex is an in-office organization, helping to foster a collaborative and communicative culture.

Career Description

Simplex is looking for smart, curious, and driven individuals to join our technology team. Technology at Simplex is the core of the business. We are a leading technology-driven proprietary market-making firm. You will be someone excited by challenges and proactive in problem-solving.

What will you be doing?

- Develop and maintain monitoring and deployment systems (Systems and Network)
- Triage and respond to issues
- Prepare and execute changes to the Linux environment
- Maintain and deploy servers and workstations
- Projects will be completed both independently and as a part of a team, when necessary
- This is an in-office position, with occasional onsite work at several colocation facilities in Chicago, Aurora, and New Jersey
- Infrequent evening/weekend work to allow for change execution outside of trading hours
- Other opportunities as assigned

Skills and Experience:

- 3+ years of experience as a System Administrator, Linux Administrator, or similar
- Thorough understanding of Linux (kernel, modules, filesystems) with special emphasis on the network stack, especially multicast, and OpenOnload
- Experience working with Linux and standard tools (bash, grep, sed, awk) and scripting languages (Python, Perl, bash)
- Understanding of Linux concepts (kernel, modules, memory allocation, filesystems)
- Familiarity with common server technologies (IPMI, SNMP), or software (Nagios, Ansible, dnf/rpm, git)
- Experience troubleshooting complex performance issues
- Ability to lift and move heavy equipment (40-50 lb regularly)

Annual base salary ranges from $125,000 to $200,000, and is influenced by a number of factors, including qualifications and experience. This role is also eligible for an annual discretionary bonus, of which can be a significant portion of total compensation. This full time role is also eligible for other forms of compensation and benefits including health/dental/vision insurance, and 401(k) contributions.

Infrastructure Engineer pay range $125,000—$200,000 USD

Why us?

Founded in Chicago in 2004, Simplex is a leading, technology-driven, proprietary market-making firm. We work with the most advanced technology and software in the market, and we’ve continued to remain at the forefront of the industry by always focusing on innovation, automation, and data-driven analysis. We also leverage our experience and expertise to make strategic investments and capitalize on opportunities in the venture capital markets with promising, early-stage financial and technology start-ups.

PLUS, the goods!

- Benefits: Excellent a la carte Medical/Dental/Vision (free employee coverage!), 401(k) match, generous parental leave!
- The Office: The kitchen is stocked with snacks, and beverages; you also have daily stipends for breakfast and lunch!
- Tuition Reimbursement: As an investment in our employees’ careers and the company’s future, we offer educational assistance to provide employees with professional development opportunities that increase their skills and enhance their contributions to the organization!
- Employee Discounts: To gyms, national brands, and more!
- Building: We are located in the Federal Reserve building. As a tenant, you have access to a building gym and a full cafeteria. We are easily accessible to all public transportation.
- Charity Match: We match up to $2,000 a year in donations to the charities of your choice!
- Fun Events: In-person happy hours, celebrations throughout the year, game nights, video game fun, and so much more!

Simplex is an Equal Opportunity Employer. Simplex and its recruitment partners may use artificial intelligence (AI) tools to support certain aspects of the recruiting and hiring process. Final hiring decisions are made by humans. For all job postings, Simplex may use AI to review and analyze applications, resumes, interviews, and applicant responses.  Simplex complies with applicable federal and state laws governing AI use. Applicants may still request reasonable accommodations. For more information related to AI or to request an accommodation, please contact HR@simplextrading.com.

## About Simplex Trading

## Company Overview
- **One-liner**: Simplex Trading is a technology-driven proprietary market-making firm that optimizes trading strategies and provides liquidity across financial markets.
- **Entity Type**: Private (proprietary trading firm, no public funding rounds disclosed)
- **Headquarters**: Chicago, Illinois, USA
- **Founded**: 2004
- **Founders**: Not publicly disclosed (founded in Chicago in 2004)

## Core Business
- **Primary industry**: Financial services – proprietary trading, market making, liquidity provision
- **Target customers**: Institutional counterparties, exchanges, and financial markets (B2B); the firm itself is the trader, acting as a liquidity provider
- **Mission/purpose**: “We facilitate financial opportunity. We are market makers. We are a liquidity provider.” Focus on innovation, automation, and data-driven analysis.

## Products & Services
- **Market Making**: Optimizing trading strategies for existing markets and developing new strategies to capitalize on financial opportunities.
- **Proprietary Trading**: Using advanced technology and proprietary software to trade across multiple asset classes.
- **Technology Platform**: Building scalable infrastructure, testing and deployment standards, and research tools for traders and developers.
- **Strategic Investments / Venture Capital**: Leveraging experience to invest in early-stage financial and technology startups.

## Market Standing
- **Valuation**: Not publicly available (private firm – no disclosed valuation)
- **Key Metric**: Not publicly available (revenue/profit not disclosed; no funding rounds tracked)
- **Notable Investors/Partners**: Not disclosed (the firm makes its own strategic investments, not externally funded)
- **Growth Signals**:
  - Expanding into new business lines, products, and geographies (via Joint Back Office structure and core business model)
  - Emphasis on continuous innovation, automation, and scaling technology infrastructure
  - Active hiring across development, front office, and accounting roles

## Competitive Advantages
- **Proprietary Technology**: Builds and owns its trading software, enabling rapid iteration and market adaptation.
- **Culture of Speed**: Minimal bureaucracy, maximum speed – decisions are made quickly, empowering small teams.
- **Data-Driven Approach**: Combines talented technologists and data-driven traders to solve constantly evolving market puzzles.
- **Low Ego, High Intelligence**: Collaborative, flat structure where all employees contribute to firm success.
- **Longevity & Stability**: Operating since 2004 with a proven track record as a leading Chicago prop trading firm.

## Strategic Focus
- **Innovation & Automation**: Continued investment in proprietary software, stronger testing/code quality, and firmwide standards to support growth.
- **Trading Edge**: Continuous optimization of trading strategies, pricing sophistication, and improved research tools/data.
- **People & Process**: Attract and retain top talent with transparency, structured feedback, leadership development, and clear career pathways; streamline workflows and strengthen trader-developer collaboration.
- **New Business Lines**: Expanding into new products and geographies, including strategic ventures via the Joint Back Office model.

## Why Work Here
- **Culture**: “Low ego and high intelligence” – collaborative, entrepreneurial, fast-paced environment with constant learning and change.
- **Benefits**: Excellent a la carte medical coverage (free employee coverage), dental, vision, 401(k) match, generous parental leave, tuition reimbursement, charity match ($2,000/year), daily breakfast/lunch stipends, stocked kitchen, game room, and frequent fun events.
- **Work Style**: In-person, team-based office environment built on collaboration between traders and developers. The office features a video game room, happy hours, celebrations, and game nights.
- **Engineering Culture**: Developers work alongside traders to identify problems and deploy solutions with maximum speed. Technology is a core pillar, with a focus on scalable infrastructure and quality standards.
- **Career Growth**: Clear pathways for growth, structured feedback, and opportunities to pursue interests across different business lines.

## Sources
1. [simplextrading.com](https://simplextrading.com/) – Company homepage
2. [simplextrading.com/about-us](https://simplextrading.com/about-us/) – About page (team, pillars, trading/technology/team)
3. [simplextrading.com/careers](https://simplextrading.com/careers/) – Careers page (benefits, perks, culture)
4. [simplextrading.com/our-team](https://simplextrading.com/our-team/) – Leadership team (Erik Swanson, Dave Haufe, others)
5. [job-boards.greenhouse.io/simplextrading](http://job-boards.greenhouse.io/simplextrading) – Current job openings

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