Wealth management
10 Citadel engineering leaders
These ten current and former Citadel engineering leaders have run engineering and technology groups at Citadel, from managing directors of engineering to heads of trading, compute, platform and quantitative engineering teams. Readers can learn how Citadel organizes engineering around its trading, research and post-trade businesses.
Professionals to explore
01—10Charles C. Figueiredo
LinkedInExperience: Head of Platform & Cloud Engineering · Citadel
Former Head of Platform & Cloud Engineering (2021–2025) and Head of Platform Engineering (2017–2021) at Citadel in New York City. He has been Head of Platform & Infrastructure Engineering at Verition since 2025, and his profile also lists Managing Director, Technology Services Group at BNY (2016–2017) and Deputy Head of Infrastructure at Bridgewater Associates (2009–2015).
George Hilios
LinkedInExperience: Managing Director - Post Trade Engineering · Citadel
Managing Director - Post Trade Engineering at Citadel since 2022. His profile describes him as a software engineering manager who has led teams, driven organizational change and delivered technology initiatives at Microsoft, Two Sigma, Citadel Securities and Citadel, and it lists Engineering Leader, Data Engineering, Big and Alternative Data at Two Sigma (2016–2022).
Henry Thacker
LinkedInExperience: Head of Electronic Trading Engineering - Fixed Income & Macro · Citadel
Head of Electronic Trading Engineering - Fixed Income & Macro at Citadel since 2025, after serving there as Engineering Team Lead - Electronic Trading Engineering Fixed Income & Macro (2025) and Senior Software Engineer (2022–2025). His profile also lists Senior Software Engineer at Apple (2019–2022) and Vice President at Goldman Sachs (2017–2019).
James Gildersleeve
LinkedInExperience: Managing Director, Head of Equities Technology · Citadel
Former Managing Director, Head of Equities Technology (2008–2018), Managing Director, Head of Portfolio Construction and Risk Technology (2012–2018) and Managing Director, Chief Operating Officer - Technology (2018–2023) at Citadel. He has been Chief Operating Officer - Platform at Verition since 2026.
John Fawcett
LinkedInExperience: Head of Equities Engineering · Citadel
Head of Equities Engineering at Citadel since 2025, listed at Head level in the Engineering and Technical department. His profile also lists Director Product Management, Brokerage API (2024–2025) and Director Product Management, Trading Platform & Clearing (2022–2024) at Robinhood, and Founder of Quantopian Inc. (2011–2020).
Johnathan Tunnicliffe
LinkedInExperience: Head of Engineering for Citadel Energy Marketing · Citadel
Former Head of Engineering for Citadel Energy Marketing at Citadel (2021–2026), listed at Director level; he has held a Research Engineering Leadership role at Citadel since 2026. His other Citadel roles include Head of Research Platform, Commodities (2020–2021) and Senior Quantitative Developer (2018–2020), and he was a Vice President at Goldman Sachs (2015–2018).
Nick Chambers
LinkedInExperience: Head of OTC Trading Engineering · Citadel
Head of OTC Trading Engineering at Citadel since 2025, where his profile says he leads a team of software engineers and domain experts building the firm's OTC trading platform and multi-asset OMS. His other Citadel roles are Software Engineering Manager (2020–2025) and Software Engineer (2018–2020).
Robert Harwer
LinkedInExperience: Head of Quantitative Engineering for Global Credit at Citadel · Citadel
Head of Quantitative Engineering for Global Credit at Citadel since 2024, listed at Director level, and Head of Application Development for Global Credit at Citadel since 2021. His profile also lists Global Head of Credit Risk Engineering (2019–2021), Head of ION Engineering for EMEA and Asia (2018–2019) and Global Head of Equities Risk Engineering (2015–2018) at Goldman Sachs.
Ruslan Kharitonov
LinkedInExperience: Head of Compute Engineering · Citadel
Head of Compute Engineering at Citadel since 2024, listed at Head level in the Engineering and Technical department. His profile also lists Technology Fellow Global Head of Network and Storage Software Engineering (2023–2024) and Global Head of Network Software Engineering (2020–2023) at Goldman Sachs, and Founder of Efacity since 2017.
Stefan Kutko
LinkedInExperience: Managing Director, Engineering · Citadel
Managing Director, Engineering at Citadel since 2022; his profile says he leads technology teams that enable global daily trading for Citadel and Citadel Securities. His profile also lists Managing Director, Technology at Tradeweb (2019–2022), Head of Client Technology at Trumid (2017–2019) and Co-founder, VP Engineering at Electronifie (2014–2017).
Choose the right perspective
Match the leader's area, such as trading systems, compute and cloud platforms, or post-trade engineering, to the technical question you are working on. Check whether each Citadel role is current or ended before asking about recent practices.
Questions to take into the conversation
- 01How do you organize engineering teams around trading desks while still sharing core platforms across the firm?
- 02What does it take to build and run low-latency, high-reliability trading infrastructure at scale?
- 03How do you decide what to build in-house versus buy for trading, risk and post-trade systems?
About this directory
This is a professional research starting point based on business profile data retrieved on . Titles and companies reflect that source snapshot and may describe past or present roles. Check the linked profiles for current details. Inclusion does not imply Instant Expert membership or availability.
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