Software Engineer - 2027 Internship Program (June Start)

Old Mission is recruiting for Software Engineer - 2027 Internship Program (June Start) in Chicago, IL, United States. This listing was last seen on the firm's own job board on August 22, 2026.

A mid-sized Chicago market maker with a practical interview and less emphasis on pedigree.

What sets Old Mission apart: Markets and instrument knowledge weighted above abstract puzzles. Smaller firm, so juniors touch live risk sooner. ETF and fixed income market making rather than equities alone.

Related preparation: Quantitative Developer (QD) Career Roadmap, Quant Infrastructure Engineer Roadmap, Quantitative Data Engineer Career Roadmap and Algorithmic Trading Developer Career Roadmap.

The role, as Old Mission describes it, published on July 15, 2026 and reproduced from their job board:

Old Mission is a global proprietary trading firm that leverages state-of-the-art technology and research to identify and execute profitable trading strategies across multiple asset classes around the world. Our offices in Chicago, New York, and London are all composed of naturally-curious individuals who thrive in a team environment and constantly strive for improvement.

About the Position

Our internship program is geared for current students who want to work alongside our talented software engineers creating impactful solutions to further the firm's market initiatives. We are a smaller firm, which means you'll get to know the people you're working with and they'll get to know you. Responsibilities include supporting the development of C++ based trading applications and tools. You will be given hands-on projects that contribute to the firm's daily activities, giving you real exposure to how our business runs, not just observation. In this role, you'll have the opportunity to learn more about creative programming and the tools needed to support electronic trading. If you're…

What you will get to do

Gain exposure to how trading works, from the underlying theory to the systems and tools we build around it

Regular sessions with senior engineers covering the fundamentals of the systems and tools we use

Get direct feedback from the engineers you're working alongside, learning in real time

Work directly with engineers, traders, and other teams on projects that matter to the firm day to day

Required Skills

Currently pursuing a bachelor's or master's in Computer Science, Computer Engineering, or a similar technical field

Minimum 3.0 GPA