10 Citadel engineering leaders
Desks and shared platforms both have named engineering leads among these Citadel leaders: equities, OTC, electronic fixed income and macro, global credit quant, post-trade, compute, platform and cloud, and energy marketing. Eight are still at Citadel and four list Goldman Sachs roles, a useful mix for a fintech, vendor or trading firm deciding how to staff engineering around desks versus shared platforms.
Professionals to explore
Charles C. Figueiredo
LinkedInExperience: Former Head of Platform & Cloud Engineering · Citadel
Charles C. Figueiredo was Head of Platform & Cloud Engineering at Citadel (2021–2025), after Head of Platform Engineering there (2017–2021), and has been Head of Platform & Infrastructure Engineering at Verition since 2025. Earlier titles include Managing Director, Technology Services Group at BNY (2016–2017) and Deputy Head of Infrastructure at Bridgewater Associates (2009–2015). A fit for questions on moving a trading firm's platform to cloud.
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George Hilios
LinkedInExperience: Managing Director - Post Trade Engineering · Citadel
Post-trade is George Hilios's area as Managing Director - Post Trade Engineering at Citadel since 2022. Roles elsewhere include Engineering Leader, Data Engineering, Big and Alternative Data at Two Sigma (2016–2022), Co-Founder of Stepwise Investments (2015–2016), Engineering Manager at Indeed (2015–2016) and Principal Technical Development Lead at Microsoft (2012–2014). George describes a management approach that starts with "Identify user-facing metrics for success" and "Measure them", a fit for questions on running post-trade and data engineering teams.
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Henry Thacker
LinkedInExperience: Head of Electronic Trading Engineering - Fixed Income & Macro · Citadel
Henry Thacker has been Head of Electronic Trading Engineering - Fixed Income & Macro at Citadel since 2025, after Engineering Team Lead in the same group (2025) and Senior Software Engineer at Citadel (2022–2025). Earlier, Henry was Senior Software Engineer at Apple (2019–2022) and Vice President at Goldman Sachs (2017–2019). A fit for questions on electronic trading systems for fixed income and macro desks.
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James Gildersleeve
LinkedInExperience: Managing Director, Head of Equities Technology · Citadel
James Gildersleeve, now Chief Operating Officer - Platform at Verition since 2026, spent years in Citadel managing director roles: Chief Operating Officer - Technology (2018–2023), Head of Portfolio Construction and Risk Technology (2012–2018) and Head of Equities Technology (2008–2018). That range fits questions on how technology for equities, portfolio construction and risk is organized and run as an operating function.
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John Fawcett
LinkedInExperience: Head of Equities Engineering · Citadel
Founder of Quantopian Inc. (2011–2020), John Fawcett held Robinhood roles in Product, Brokerage Data Products (2020–2022), Director Product Management, Trading Platform & Clearing (2022–2024) and Director Product Management, Brokerage API (2024–2025) before becoming Head of Equities Engineering at Citadel in 2025. A fit for questions on equities trading platforms seen from both the brokerage and the fund side.
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Johnathan Tunnicliffe
LinkedInExperience: Head of Engineering for Citadel Energy Marketing · Citadel
Since 2026 Johnathan Tunnicliffe's Citadel title has been Research Engineering Leadership; from 2021 to 2026 it was Head of Engineering for Citadel Energy Marketing. Earlier titles include Head of Research Platform, Commodities (2020–2021), Senior Quantitative Developer at Citadel (2018–2020) and Vice President at Goldman Sachs (2015–2018). A fit for questions on commodities research platforms and energy trading engineering.
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Nick Chambers
LinkedInExperience: Head of OTC Trading Engineering · Citadel
Nick Chambers, based in London, has been Head of OTC Trading Engineering at Citadel since 2025, leading software engineers and domain experts building the firm's OTC trading platform and multi-asset OMS. Citadel titles also include Software Engineering Manager (2020–2025) and Software Engineer (2018–2020), with Software Engineer at Bloomberg (2013–2018). A fit for questions on building an order management system for OTC and multi-asset trading.
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Robert Harwer
LinkedInExperience: Head of Quantitative Engineering for Global Credit · Citadel
Robert Harwer, based in London, holds two current Citadel titles: Head of Quantitative Engineering for Global Credit at Citadel (since 2024) and Head of Application Development for Global Credit (since 2021). Goldman Sachs roles are 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). A fit for questions on credit trading and risk engineering.
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Ruslan Kharitonov
LinkedInExperience: Head of Compute Engineering · Citadel
Ruslan Kharitonov became Head of Compute Engineering at Citadel in 2024 and has also been Founder of Efacity since 2017. Goldman Sachs titles are Technology Fellow Global Head of Network and Storage Software Engineering (2023–2024), Technology Fellow Global Head of Network Software Engineering (2023) and Global Head of Network Software Engineering (2020–2023), a fit for questions on compute, network and storage software at a trading firm.
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Stefan Kutko
LinkedInExperience: Managing Director, Engineering · Citadel
Stefan Kutko has been Managing Director, Engineering at Citadel since 2022, leading technology teams that enable global daily trading for Citadel and Citadel Securities. Earlier roles are Managing Director, Technology at Tradeweb (2019–2022), Head of Client Technology at Trumid (2017–2019), Co-founder, VP Engineering at Electronifie (2014–2017) and Head of Capital Markets Technology at Liquidnet (2007–2014), a fit for questions on electronic trading technology.
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Choose the right perspective
Desk-specific questions go to John Fawcett (equities), Nick Chambers (OTC), Henry Thacker (electronic fixed income and macro), Robert Harwer (global credit) or Johnathan Tunnicliffe (commodities research and energy marketing). Shared infrastructure sits with Ruslan Kharitonov (compute), George Hilios (post-trade) and Charles C. Figueiredo (platform and cloud, now at Verition); Stefan Kutko covers trading technology for Citadel and Citadel Securities, and James Gildersleeve held the Chief Operating Officer - Technology title until 2023.
Questions to take into the conversation
- 01When a multi-strategy fund adds a trading desk, which engineering pieces come from the shared platform and which does the desk build itself?
- 02How should a post-trade engineering group measure success when its users are traders and operations staff?
- 03How is compute capacity divided when quant research and live trading draw on the same infrastructure?
About this directory
This is a professional research starting point based on business profile data retrieved on . Titles and companies reflect that source snapshot; roles marked former had ended by then. Check the linked profiles for current details. Inclusion does not imply Instant Expert membership or availability.