Stephen Donahue Email and Phone Number

* Led team responsible for maintaining a stable production trading system on just under 300 hosts spread across 5 data centers and running approximately 8500 processes with minimal downtime. Areas of responsibility included host and process health, system configuration, software deployment, data distribution and archiving. * Along with system health, the team was responsible for ensuring the availability and accuracy of system inputs such as security definitions, dividends, corporate events, index/ETF compositions and positions.Liaised with the managers of other groups across the firm to coordinate and implement further improvements to the technology, hardware and security of the group.* Spearheaded effort to reduce toil and manual interaction with the system through the automation of repetitive tasks, streamlining workflows and utilizing third party apps such as PagerDuty to reduce manual monitoring.* Established an incident management procedure to better respond to and recover from production incidents and to conduct post mortems to learn from and avoid repeat occurrence of any incidents. Further, acted as OMM representative on the firmwide Engineering Managers Incident Management Forum where we discussed any incidents and to share ideas and lessons learned firmwide. * Led project to integrate legacy Timber Hill technology and configuration stack into the TSS wide configuration stack to ensure homogenous configuration across the firm.*Led project to remove system dependency on Interactive Brokers security definition files and replace with in-house security definition information. Required understanding, replacing and adapting old, often decades old, code while also creating new workflows and monitoring to ensure accuracy during and after the transition.

* Served as Level 1 and Level 2 support for any issues that may occur while making improvements to ensure a smoothly functioning system with maximum uptime.* Integral member of the team responsible for porting and integrating the legacy Timber Hill system into the TSS universe.* Authored multiple processes and scripts to monitor, validate and alert principles when any inputs or integrations may seem out of bounds.* Maintained and automated the firm dividend, earnings and index/ETF composition ingestion to reduce manual intervention and prevent inaccuracy that can often come from human input.* Served as content expert for many projects and improvements to the system as we worked to create a successful market making business.

• Monitor various sectors of firm portfolio, including Chemicals, Basic Materials, Raw Materials, Miners, and Pipelines.• Manage development and deployment of low latency algorithms involving machine readable news feeds. • Develop real time monitoring tools to capture signals from market activity.• Improve earnings data management by automation utilizing vendor data and real time news sources. Process times were decreased by 1200%.• Develop new quoting and trading algorithms to improve profitably.• Improve risk manager efficiency by developing notification system for real time portfolio impact of earning and dividend announcements.• Debug various quoting and pricing algorithms.• Manage compliance, PNL, risk and pricing reporting including investigating regulatory inquiries involving firm market making activity.• Expand ETF spot trading by developing quoting rule set, creating a monitoring infrastructure to ensure competitive quoting while meeting regulatory compliance. • Maintain all ETF spot quoting activity including debugging pricing, quoting and composition issues. • Identify creation and redemption opportunities in cooperation with Securities Lending Desk.

• Maintained files and databases quality to ensure system operated properly.• Resolved execution error requests and reviews for stock and option exchanges.• Developed and oversaw the implementation of firm Nasdaq Market Making operation including establishing automated quoting infrastructure and ensuring compliance with quoting regulations.• Managed regulatory reviews and developed required oversight.• Rapidly diagnosed and resolved system issues.• Authored reports, scripts and automation providing accurate information and solutions to the risk managers and increasing the efficiency of the system.