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    InternshipsOld MissionSoftware Engineer – 2027 Internship Program (June Start)

    Software Engineer – 2027 Internship Program (June Start)

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    Old Mission

    201-500 employeesFounded 2008Chicago, IllinoisFinancial Services
    Posted 21 days agoApply by Aug 14Actively hiringPaidSummer 2027Financial Services

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    About the role#

    This internship program is designed for students to work alongside software engineers on impactful solutions that support the firm's market initiatives. As a member of a smaller team, you will receive direct mentorship and contribute to projects that influence daily operations. You will gain a firsthand look at electronic trading systems and the creative programming required to support them.

    What you'll do#

    • Support the development of C++ based trading applications and tools.
    • Work directly with engineers, traders, and other teams on projects that contribute to the firm's daily activities.
    • Gain exposure to trading theory and the systems built to support it.
    • Participate in regular sessions with senior engineers to cover the fundamentals of internal systems and tools.
    • Receive real-time feedback from the engineers you work alongside.

    What you'll need#

    • Currently pursuing a bachelor's or master's degree in Computer Science, Computer Engineering, or a similar technical field.
    • At least junior standing, with an expected graduation date of December 2027 or May 2028.
    • Minimum 3.0 GPA.
    • Proficiency in at least one of the following: C++, Python, or TypeScript.
    • A solid grasp of computer science fundamentals, including data structures, algorithms, and systems.
    • A genuine interest in markets and the role software plays in supporting them.

    Location & details#

    • Location: Chicago, Illinois.
    • Term: Summer 2027.
    • Start date: June 1, 2027.
    • Modality: Full-time, on-site.
    • Compensation: Paid position with a base salary range of $150,000 - $200,000.
    • Benefits: Corporate housing provided at no cost, and daily breakfast and lunch provided on-site.
    Relevant fieldsComputer ScienceComputer Engineering

    About Old Mission

    Founded in 2008 and headquartered in Chicago, Illinois, Old Mission is a privately held financial services firm with a workforce of 201 to 500 employees. The company functions as a global, multi-asset market maker that focuses on the valuation of individual securities and complex derivatives. Its operations center on automated trading, arbitrage, and software development to facilitate risk transfer for institutional investors, brokers, and exchanges.

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    Old Mission logoOld Mission
    Open internships1
    Employees201-500 employees
    Founded2008

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