Primary languages: OO Perl, Python
Secondary: C, Octave, C++, R, bash, Javascript, Java

gcc, g++, gdb, make; HTML, XML, bash, Postgres, MySQL, DBI

SVN, CVS; Trac, bugzilla, Apache, CGI, mod_perl, Web services

Linux: Debian, Redhat; Mac OS X, FreeBSD, SuSE, Solaris, HP-UX

WHITEHAT SECURITY, INC., Santa Clara, CA; Data Scientist/Sr. Software Engineer

• Worked on data warehouse dimentional modeling, ETL coding and design; implementatino of analytics operational data store as a source of the data warehouse.
• Analized and performed data mining, generating reports for Marketing, C-level executives, and Sales.
• Lent advice and expertise in data access and analysis to various other departments.
• Contributed to improving QA and Release infrastructure -- primarily in design and consultation.

GOOGLE, INC., Mountain View, CA; Test Engineer

• Wrote test plans and built testing infrastructure to test Google Analytics backend.
• Built framework in python to test unsampled queries in Google Analytcis, resulting in automated tests and developer tools.

WHITEHAT SECURITY, INC., Santa Clara, CA; Sr. Developer

• Tuned accuracy of automated scans with statistical analysis as a Mathematician/Computer Scientist;
• Coded text classification algorithms, using Perl, PDL, also C and XS.
• Optimized DB as a Software Engineer and computed statistics reports; Debian, Perl, Apache and Postgres and pl/pgsql stored procedures;
• Designed distributed database with horizontal and vertical partitioning;
• Defined defect life cycle and created release process as Release Engineer with QA and dev team; Trac admin, SVN, and custom Perl and Python scripts.
• Automated deployment of builds to production clusters as release engineer; using dsh, bash + Perl
• Planned and lead team meetings as ScrumMaster (CSM); lead effort deciding sprint completion policy and scrum process
• Facilitated architectural discussions

NETLI, INC. (acquired by Akamai in 2007), Palo Alto, CA; C Conversion Engineer (contractor)

• Converted code from older version of C (gcc 2.9) to Intel ICC 9 compiler -- required rewriting large sections of network optimization software; added unit tests and automated build

YAHOO! Strategic Data Services, Sunnyvale, CA; Sr. Yahoo (Sr. Software Engineer)

• Solved real-time analytic processing problems for clustered high data throughput (C++ on BSD4);
• Analyzed very large XML files (Perl XML::Simple)
• Packaged software for installation purposes, using Yahoo's packager

SYGATE TECHNOLOGIES, INC, Fremont, CA
Sr. Software Engineer

• Devised network device classification algorithms with ad hoc and Bayesian rules; thus met 90% accuracy goal
• Developed network discovery appliance to process device and SNMP data (Perl, MySQL, C, Java); helped make Sygate a visionary leader in Sarbanes-Oxley rating
• Managed builds and branches as Realease Engineer; gnu make, CVS, bugzilla, BSD5
• Created FreeBSD distribution & build tools; on-demand PXE installer; 75% faster builds

PAYPAL, AN EBAY COMPANY, San Jose, CA
Sr. Software Engineer, SQA

• Built automated web UI client (web scraper) Perl LWP; increased testing efficiency 90%
• Tested web services with Java and Perl clients
• Performed manual QA blackbox web application testing

GENMATRIX, INC, Livermore, CA
Scientific Programmer, Research, Sysadmin

• Designed protein structure prediction algorithms; establishing proof of concept for business model. Implemented complex algorithms in C++, Perl, C, MySQL
• Paralellized protein superposition algorithms for Intel Terascale supercomputer in C++
• Extended RASMOL (a 3D protein viewer); Wrote amino acid sequence alignment editor in Perl/Tk

SiteROCK CORPORATION, Emeryville, CA
Software Engineer
Design, QA

• Co-designed 3-tier architecture in Software Development Life Cycle (SDLC); created key business driving software
• Created web and email based load testing software with Perl and C++

SUN-NETSCAPE ALLIANCE, Mountain View, CA
Release Engineer

• Implemented installer in C++ for e-commerce products; simplified installation for developers and end user
• Maintained build and automated testing, (Perl/CGI, javascript and CVS); 30% increase in reliability and delivery speed

UC DAVIS COMPUTER SCIENCE DEPARTMENT, Davis, CA
Research Assistant/Associate Instructor

• Invented graph theory algorithms and Theorems
• Implemented graph algorithms in C++ with STL and LEDA; fulfilled funding requirements for a NSF research grant
• Built components of sourc code analyzer (C); NSF funded research
  
• Enhanced open-source community by creating templated C++ Matrix library.
• Taught classes on C and UNIX to five hundred students.
• Promoted student learning by implementing automated grading; UNIX/Perl

POLLSTAR, Fresno, CA
Web Programmer

• Developed efficient CGI (Web) & ETL in Perl & C; Worked closely with CTO; Restored usability to web site.
• Configured and administered high speed, reliable Linux server, customized for website needs.

KINGS CREDIT SERVICES, Hanford, CA
Computer Programmer and System Manager

• Constructed mortgage reporting system on VAX; saved 50% operator time; software sold to other agencies.
• Extended software to automate collections process (Basic, C and assembly); increased productivity 15%. 
• Supported legacy software (Basic and assembly); 20% time savings for personell.

CLASSES:

Machine Learning, Stanford University, Online Course by Andrew Ng
This class involved coding in Octave, for Linear and Logistic Regression, Neural Networks, Support Vector Machines, Clustering, Anamaly Detection and Dimensionality Reduction,  https://www.coursera.org/course/ml,  Statement of Accomplishment (pdf).

Advanced Dimensional Modeling, The Data Warehouse Institute (TDWI), A four day intensive seminar on conformed dimensions, Data Warehouse Architecture, Operational Data Stores, ETL and Advanced Dimensional Modeling:
http://events.tdwi.org/events/seminar-series-2012/information/vancouver-seminar.aspx

Data Mining Camp, Sponsored by ACM and Ebay, and others.  Two day Big Data and Data Mining seminar.
http://www.sfbayacm.org/DMcamp2012
http://www.sfbayacm.org/event/big-data-professional-development-seminar

Certified ScrumMaster, Agile University by Rally Software, profile: http://www.scrumalliance.org/profiles/14612-bill-coffman

Publication:

• "Bounds for the Chromatic Number of Graphs with Partial Information", Discrete Mathematics, July 2002, Artcl 4815

University of California Davis, Davis, CA
Ph.D., Computer Science (emphasis in Systems and Networks)
      Dissertation Title: "Graph Coloring Heuristics and Compiler Optimization".
M.S., Computer Science

California State University Fresno, Fresno, CA
M.S., Applied Mathematics
B.S., Applied Mathematics