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 Role We are looking for a Senior Accountant to join our Chicago Accounting team. You will own treasury and cash management, vendor payments, technology-related accruals, and key parts of the month-end close, working across multiple legal entities and side by side with our technology team. It is a high-ownership role with real visibility into how a global trading firm runs. Reports to Controller; Team is currently made up of 6 accounting professionals What You'll Do • Manage day-to-day treasury operations, including oversight of cash across multiple entities: funding bank accounts and moving cash between accounts and entities to meet operating, trading, and vendor obligations • Own the monthly accrual process for technology-related costs, ensuring expenses are recorded accurately and in the proper period, and that accruals reflect all open purchase orders • Run the vendor payment process, including periodic invoice review and processing of ACH batches, wires, and other payment types • Partner with the technology team to set up purchase orders accurately and on time for new and renewing market data, colocation, and related services • Perform general ledger reconciliations and accounting tasks in accordance with GAAP, supporting the month-end close • Analyze variances in technology-related expenses against budget and prior periods, investigating and explaining significant fluctuations • Maintain internal controls over cash and payments, including payment approval workflows and segregation of duties • Help prepare schedules and supporting documentation for external auditors What You Bring • 4+ years of experience in accounting • Bachelor's degree in accounting or a related field • Hands-on experience with treasury or cash management, including vendor payment processing (ACH and wires), bank funding, and cash monitoring • Strong knowledge of general ledger reconciliation practices • Working knowledge of GAAP and accrual accounting, including accruing for open purchase orders • Proficiency in Microsoft 365 applications, especially Excel • Ability to collaborate with non-finance teams, such as technology, and to communicate financial information clearly • Ability to work independently after onboarding Nice to Have • CPA designation • Experience with Sage Intacct • Experience in the securities trading industry or financial services • Familiarity with purchase order and procure-to-pay processes • Curiosity about AI. We encourage the use of tools like Claude and Microsoft Copilot to work smarter, and we want teammates who enjoy finding better ways to get things done Benefits and Perks - Fully paid Medical, Dental, Vision, Disability, and Life Insurance - Fully stocked kitchen; free breakfast and lunch every day on-site - Tuition Reimbursement Program - 401(k) with employer match - Paid Vacation, Sick, and Parental leaves - Commuter and Flexible Spending Programs Base Salary Range $100,000-$150,000 - Salaries are based on numerous factors such as skills, experience, and education. Our compensation package also includes a discretionary bonus and a comprehensive benefits program for full-time employees. For more information, reach out to your recruiter. 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.