Dan Applebaum

Starting an independent development and consulting firm for financial applications Developing OpenBroker, the core system for a securities broker-dealer, in Rust, for use by emerging brokerages Order management system, account balances and positions maintenance Fine grained customer account permissions Event based architecture REST and Websockets API Javascript library for ease of web application development Example web application as basis for customizations

Java developer on strategy-level high frequency trading applications Architected, developed and led the implementation of a new Java quantitative automated trading strategy component Rewrote internal algorithms for 150X speed improvement, leveraging SIMD Centralized the computation to a new microservice to reduce load on existing services Developed a reusable integrated service discovery and connection lifecycle framework Replaced multiple existing similar systems, reducing ongoing software maintenance and increasing the speed of development of new services Improved a Java multicast UDP market data receiving library to address 20% message loss Introduced more effective Java thread handling, for ~100% reduction in message loss Mentored junior developers to improve their communication and teamwork

Java developer on the KYC – Know Your Customer – development team • Designed and developed Java fully automated reporting of “unusual transactions” for anti-money laundering analysis, replacing a manual process, reducing manpower requirements, improving accuracy and compliance • Created the New Review Flow, improving the underwriting team’s ability to handle reviews by at least 4X and enabling the on-boarding of larger volume customers • Improvements to the Workflow Processor, reducing load and increasing performance • Test framework contributions to increase developer productivity and reduce defects ◦ Enhanced assertions to improve integration and unit test expressiveness ◦ Enhancements to correlate logs between integration test and server side executions

Chief software architect, executing both design and governance responsibilities across E*TRADE's brokerage and banking business • Managed the Architecture, Collaboration and Education (ACE) team ◦ Developing the next generation software frameworks, external-facing E*TRADE REST API and a prototype chatbot • Worked with other leaders to establish an Agile SDLC across the entire technology team • To comply with market data usage redistribution restrictions, designed a site-wide Simultaneous Access Restriction approach

Chief architect, responsible for back-end and integration architectures, and education • Managed architecture team • Participated in extensive post-merger corporate process reengineering, including introduction of Agile SDLC and operations procedures

Manager, architect and Java developer for back-end systems and database teams • Managed back-end development and database teams • Led cross-functional teams in the development of major new features ◦ Futures trading, bond trading & Autotrade functionality • Hands on Java developer for major architectural features in the brokerage system

Architect in the Clearing Information Technology (CIT) department • Collaborated on the design of common Java components, improving developer productivity • Developed substantial portions of the Java code for the Positions system • Worked extensively with business users and subject matter experts to align development with business needs