College Graduates - Full-Time, Junior Software Engineer, 2024
About the job
- Undergraduate or advanced degree in a quantitative field such as Computer Science, Engineering, or one of the hard sciences
- Minimum 3.0 GPA
- Knowledge of C++ and Python, SQL, JavaScript, React
- Understanding of systems programming, data structures, and algorithms
- Familiarity working in a Linux environment
- Strong analytical and problem solving skills
- Great communication skills, both written and verbal
- Strong work ethic and ability to adapt quickly in a fast-paced environment
- Developing and supporting C++ based trading applications and tools
- Contributing significantly to the firm’s daily activities
- Learning more about creative programming and the tools needed to support electronic trading
- Being part of building out the business
- Experience in electronic trading
- Experience in proprietary trading
- Experience in financial markets
About the company
Old Mission trades its own money as a market maker, which means it stands ready to buy and sell exchange-traded funds, options, bonds, and currencies so investors can trade when they need to. It made its name on exchange-traded funds that rarely trade and are hard to price, which other market makers often would not quote. Its researchers turn past market data into pricing models, engineers build the automated systems that send quotes to exchanges worldwide, and traders manage the resulting risk. The firm earns the gap between its buying and selling prices, and asset managers and fund issuers can also trade with it directly. Old Mission was founded in 2008 and is based in Chicago, with offices in New York and London.
Company Size
201-500
Company Stage
Private
Total Funding
N/A
Headquarters
Chicago, Illinois
Founded
2008
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Simplify's Take
What believers are saying
- Room to grow: in July 2026, Old Mission lined up 70,000 square feet in Chicago's Fulton Market, up from 52,000.
- The trading book swelled: Old Mission's main trading arm held $27.4 billion in December 2025, up 57% in a year.
- Graduates start well paid: Old Mission's 2027 quantitative trader hires get a $200,000 base salary plus a discretionary bonus.
What critics are saying
- Rivals dwarf it: trading giant Jane Street's 3,500 staff took in $16.1 billion in the March 2026 quarter.
- Expect five office days a week: Old Mission's engineering and operations posts allow only 10 remote days a year.
- Old Mission's safety buffer thinned: its main trading arm's regulatory capital fell 34% to $119 million by December 2025.
What makes Old Mission unique
- Not all trading is on screens: Old Mission's growing Cboe floor team trades options by voice in Chicago.
- Goldman Sachs extends it better borrowing terms: a joint back-office deal exempts Old Mission from standard customer margin rules.
- Asia is traded overnight from Chicago: Old Mission's Asia-hours traders work 4 p.m. to 3 a.m., Sunday through Thursday.
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Benefits
Competitive Salary
Discretionary bonus
Top tier Medical, Dental, Vision, Disability and Life Insurance paid for by the firm
401(k) with employer match
Full stocked kitchen, free breakfast and lunch everyday on-site
Tuition reimbursement
Flexible Spending Plan
Commuter Benefit Program
Company News
Ameriflex Group Inc. purchased a new stake in SPDR Nuveen ICE Short Term Municipal Bond ETF in the 4th quarter worth approximately $27,000.
OLD Mission Capital LLC purchased a new position in shares of iShares Short-Term National Muni Bond ETF in the first quarter valued at about $8,875,000.
CHICAGO, Sept. 9, 2025 /PRNewswire/ - Old Mission Capital, a leading global market maker in exchange-traded funds (ETFs), today announced that Eugene Davidovich has joined the firm to lead the development of its first single-dealer trading platform, expected to launch by the end of 2025.
Finally, OLD Mission Capital LLC acquired a new stake in Schwab Emerging Markets Equity ETF in the fourth quarter valued at approximately $20,734,000.
Finally, OLD Mission Capital LLC acquired a new stake in Global X Silver Miners ETF in the 4th quarter valued at $948,000.