Chris D'Urso

Objective

Lead Software Engineer and Contributor to Large Scale High Performance Data System - Develop Analytic and Machine Learning Applications

Highlights

Invented a technique in which item-region specific logistics data could be stored and evaluated for each available item on each search query
Designed and implemented Searchme's production search indexing subsystem - handling millions of user searches and 10's of billions of document updates per month
Maintained and advanced web log data mining system capable of complex real-time traffic queries on data sets as large as 80 million unique users traversing 650 million URLs. Designed and implemented general purpose data mine system with pre-aggregative approach applied to schema derived (hence flexible) relational models (utilizing pre Y2K hardware)
Maintained and advanced program trading systems central to then the most active institutional trading desks. One system managed a desk on the NYSE executing up to 20% of the exchanges total daily volume
Successfully adapted legacy chemical instrument analysis package for rapid product enhancement, saving market share and brand presence at customers' laboratories. This success, completed prior to the final (OEM) hardware selection, permitted ample time for further software enhancement prior to product release
Advanced state of the art in CAPTCHA visual challenge with contextual innovation

Summary of Qualifications

Decades designing and developing software, including tools and services for scientific, business, web services, and consumer applications on Linux, Windows, and Macintosh platforms.
Valuable organizational and interpersonal skills necessary for strategic teamwork and consumer interaction
Creative approaches and innovative methodologies from design and analysis through implementation of systems
Practical, yet visionary, attending to details while realizing the goal of successful completion, often resulting in products and services many of which remain vibrant for a decade or more
Broad background in computer science, physical sciences, mathematics, education and engineering for everything from chemistry experiments to financial instruments, Photoshop(tm) graphics to graphical processing, to very large scale often real-time information retrieval and analytics systems.

Skills

Modeling, machine learning, analytics, machine/experiment simulation and control, symbolic/linear mathematics, data visualization, statistics, multi-threaded programming, distributed services, advanced algorithms, information retrieval and real-time systems
Primarily linux programming, experience developing applications on MacOS, Windows, Solaris, BSD, and embedded platforms
OOD/OOP, gcc, Oracle, MySQL, STL, boost, C/C++, Java, JavaScript, lua, perl, python, php, shell
Systems administration at development, test and sometimes production levels

Experience

Supplemental Instructor, STEM Center

2017 - 2019

Foothill-De Anza Community College

One on one and small group instruction from introductory to advanced concepts
Subjects: computer science and engineering, discrete mathematics, computer architecture, languages, networking, operating and file systems
Approaches: functional, object oriented, and generic programming, data structures and algorithms
Languages: assembly, C++, Java, Python, JavaScript, SQL
Comprehension and addressing subject, assignments or challenges, evaluating, organizing, control, and debugging, source code, related tools and resources

Member of Technical Staff, Bullseye Realtime Personalization Engine

2015 - 2016

eBay, Inc.

Develop and expand high availability large scale distributed system to run arbitrary models billions of times each day
System attributes

Years of data on hundreds of millions of customers
Potentially thousands of market driving events and attributes
Response is on order of milliseconds, often sub-millisecond, and frequently for multiple independent services on each web page generation

eBay Advertising

2012 - 2015

eBay, Inc.

Engaged in developing a nascent advertising marketplace for one of the worlds most comprehensive and distributed marketplace
Developed Real Time Bidder(RTB)
Development, operation and maintenance of Data Mart Platform (DMP) including at scale real-time identity mapping service, and audience distribution
Hadoop, Hive, scripts integration, for maintenance and analytical processes in support of DMP and identity mapping and services

Chief Operations Advisor

2010 – 2015

AppUplink Partnership

Provide expertise and equipment to a couple of adolescent entrepreneurs who have developed various iOS, mobile computing, and media ventures resulting in a six figure annual profit
Apple iOS applications
Partners have achieved

Over 110 million YouTube views, with 425 thousand channel subscribers
Over 250 thousand FaceBook likes

Search Back End Engineering

2010 - 2012

eBay, Inc.

Sustain and advanced search functionality on eBay, the largest and most diverse marketplace on earth
Invented algorithms, data structures, and systems to evaluate logistic features in the context of realtime search for reporting, recalling and ranking items
Advance algorithms and analytic tools that support grid computation for a large scale internet marketplace

Consultant AdCommerce Group

2009 - 2010

eBay, Inc.

Architected and developed distributed budget service for high volume advertisement optimization service (an Google AdWords(tm) knockoff)
Utilized Oracle Template Library(OTL), a database and a custom (XML/SQL based) language so that budget models were dynamically configurable and integrated with current and future services

Computer Scientist

2006-2009

Searchme, Inc.

C++, XML, Perl in a LAMP environment

Invented and deployed novel highly compressed direct access index for terms, concepts, or other document related features in the context of whole internet indexes

Quicker than uncompressed access times
The index could roughly approximate Google, Yahoo, and AllTheWeb (huge organizations with significantly more resources)
The indexing process was proven to scale efficiently and linearly indefinitely
A design was developed to incrementally update, adding, and deleting content from fixed indexes on a live search engine

Subsequent work suggested that the principle index coding mechanism could apply generally to tokenizable data and scale at close to constant time access with indefinite sizes

Consultant Merchant Risk/Fraud Authentication Group

2005-2006

PayPal (an eBay, Inc. Company)

C++, XML and SQL in an Apache/Linux environment

Delivered technology initiative to automate the onboarding of small and medium business via PaymentPro and VirtualTerminal programs
Managed risk through automated application evaluation, 3^rd party verification, and case management tools
Invented and patented new CAPTCHA technology
Updated OFAC reporting process
Team BugCzar
Knowledgeable in CGI, server development, XML and scripting/php for simulators and developer/qa test tools

Sole Proprietor

2004-2005

Consulting and Independent Contracting

Developed control and analytical systems for small instrument manufacturers
Automated computer laboratory and integrated software services
Developed drivers and collaborated with major Chromatography Data System vendors

Simulation Engineer (Embedded Software Engineer)

2003-2004

Asyst Technologies, Inc.

Created advanced Materials Handling Systems, using C/C++, VxWorks, WinCE, Win2K, Tornado, MEI, CAN
Developed algorithms using multi-axis motion control mathematics, with communication and safety allowances
Continued and stabilized robotic transport system to win multi-million dollar AMHS contract in 300 mm FAB at UMCi
Rapidly redeveloped project porting WinCE controller to VxWorks platform

Senior Software Engineer

2000-2001

Futuristics Labs, Inc./TeraLytics

Sunnyvale, California

Created Data Mine Service using C++, STL, Oracle, Informatica, WinNT, Solaris
Maintained and developed a web log query service for clients whose volumes were too expansive for traditional DB and OLAP approaches
Designed and developed the next generation of data mine products for real-time analysis of tera-transaction data stores
Created and implemented algorithms to build fast ordered mappings, hash tables, and hierarchies

Software Engineer

1999-2000

Iris Financial Engineering & Systems, Inc.

San Francisco, California

Developed Program Trading Systems using C++, dbx, Quantify/Purify, Solaris, Linux
Maintained, designed, enhanced and optimized program trading systems, including the most active program trading system on the NYSE
Advanced the Iris Technical Framework, a framework tuned specifically for rapidly creating trading, portfolio, and risk management systems

Software Engineer

1996-1999

Varian Associates, Chromatography Systems Business

Walnut Creek, California

Advanced Liquid Chromatography Applications using C/C++, assembly, MFC, Win32, Windows95/NT4
Generalized liquid chromatography photo-diode array application to suit OEM instrument
Created libraries and models to improve look and feel with instant 3D and false color data visualization and animation on inexpensive PCs
Developed frameworks, algorithms, and technical strategies for current and future products

Software Engineer

1995-1996

Scientific Digital Visions, Inc.

San Jose, California

Developed Educational Software containing multimedia simulations of laboratory experiments which would otherwise be too dangerous, expensive, or impractical for the targeted audience
Facilitated company startup by purchasing and administering computer equipment, networks, and communication systems

Software Developer

1994

68K/NPS/ARRISystems

Santa Clara, California

Created Image Processing applications using Pascal, MacOS6
Developed software for the image processing hardware: ImagicianPro (an accelerator for graphics professionals)

Education

Double Bachelor of Science Degrees in Chemistry and Applied and Computational Mathematics, San Jose State University

Continuing education with regular attendance and presentations in professional groups and meetups. Frequent online and in person course work and independent study

Patents

Contextual visual challenge image for user verification, US 20080072293 A1 / WO 2008030363 A2, Granted 14 April 2014 US Patent Number 8,631,467

Systems and processes for functionally interpolated increasing sequence encoding, US 20100125614 A1

Determining Shipping Costs Using a Logistics Table, 2043.B77US1 (Patent Application January 2013)

Surfacing Items That Satisfy Purchasing Constraints, 2043.C49US1 (Patent Application January 2013)

Other Achievements/Activities

Treasurer of the professional Bay Area Mass Spectroscopy discussion group; Founder and President of the San Jose State Mathematics and Computer Science Club; President of Commemorated chapter of the Students Affiliates of the American Chemical Society; Scholarship recipient at Computers, Freedom and Privacy Conference; Staff Member and Poster Presenter at the First Scientific and Engineering Applications on the Macintosh Conference; Poster Presenter at California State University Computational Chemistry Council Conference; Four season youth sports Coach/Manager; Mentor and tutor of STEM; Winner of charity hackathon