Old Mission
C++ Software Engineer

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About Old Mission
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.
Old Mission does not seek capital from outside investors, allowing us the flexibility to aggressively invest in our team members and keep them engaged in the firm’s growth.
About the Position
Old Mission Capital LLC, is looking to add a C++ Software Engineer to join our team in London. In this role, you will be building and optimizing our current automated trading infrastructure, and you will also be tasked with working directly with our Traders and Quants to develop the next generation of the firm’s trading algorithms and strategies. Additionally, you will be responsible for creating and developing scalable multi-tiered applications. Our Software Engineers work on small collaborative teams and are a key component for our success.
Reasons to use Rodeo
I’m in my final year doing Economics and I don’t know whether to apply for grad schemes now or do a masters first. What do you think?
Honest answer — it depends on where you want to end up. A lot of top grad schemes (Big 4, civil service, banking) don’t need a masters. Let’s look at the ones you’d be competitive for now, and we can decide if a masters actually adds anything.
Also worth knowing: most autumn 2026 applications are open now. Timing matters more than you think.
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Graduate Consultant — 2026 Scheme
Why you're a good match
StrongYour economics background and your summer at a regional bank line up with what PwC looks for on the consulting scheme. Applications close in four weeks.
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Why you're a good match
You’ve got the grades and the economics background, and your bank internship is exactly the experience this scheme looks for. Apply soon — deadlines close within the month.
Experience fit
Your summer at the bank plus your econometrics coursework map directly to the day-one responsibilities on this scheme — client modelling, market briefings, and deal support.
Only hits
No noise. No "maybe this fits." Just roles with a clear explanation of why they're right — and where to focus when applying.
Required Skills
- BS/BA degree in Computer Science, Engineering, or another technical related field
- 3+ years of experience developing applications in modern C++
- Experience with C++ 11/14/17/20, Linux and Python and BASH scripting
- In-depth knowledge of the Linux kernel, systems programming
- A passion for solving challenging problems
- Strong systems knowledge and prefer some experience in developing low latency systems
- Experience with writing applications connecting to exchange API’s or using network protocols
- Experience with parallel, concurrent, and multi-threaded programming
- Prefer experience with low-latency computing and hardware-level design
- Experience with Git, SVN, Mercurial


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Benefits and Perks
- Competitive salary with discretionary annual bonus
- Fully paid private medical, dental, vision with extended coverage and life insurance
- Robust Pension Scheme, income protection, and salary exchange
- Fully stocked kitchen and free on-site lunch daily
- Season Ticket Loan Scheme
- Tuition Reimbursement Program
Old Mission is not accepting unsolicited resumes from any staffing/search firms. All resumes submitted by staffing/search firms to any employee at Old Mission via-email, the Internet or directly without a valid signed search agreement will be deemed the sole property of Old Mission, and no fee will be paid in the event the candidate is hired by Old Mission.
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