Robert Joseph McMahon
13654 Verde Vista Court
Saratoga, CA 95070
Phone Home: (408) 867-2252 Cell: (408) 438-3756
rjmcmahon at rjmcmahon.com
http://www.rjmcmahon.com
skype id: rjmcmahon

OBJECTIVE

Test & measurement position for networking products in growing markets. Interests include machine learning of large data sets and fully automated systems

QUALIFICATIONS

WORK EXPERIENCE

Broadcom Corporation, QA Engineer, Sunnyvale, CA October 2009 -

Principal Software Automation Test & Meausurement Engineer:  Performing as a software automation test & measurement engineer writing automation test infrastructure and automated tests for 802.11 ASICS and device drivers.  Design and built RF test beds with controlled RF environments including variable attenuators. Supported scale out of testbeds and test operations in offshore facilities. Perform as both an individual contributor and a technical lead. Trained personal at all levels across geographies.

Represented Broadcom at the FCC as a technical expert for both DSRC & 6GHz unlicensed spectrum, to both the FCC commissioners & the FCC technical group.

Maintained iperf 2 as open source since 2014. Fixed bugs, re-factored the code for better maintenance, and added new features around latency and more. Released Python asyncio code called flows. Integrated some ML clustering for latency histograms.


Wrote interactive debugger for TCL Snit. Wrote TCL based web server to submit, schedule and monitor autonomous test rigs. Developed a TCL package (approximately 4K lines of code) for traffic streams using an asynchronous, distributed, object oriented and event driven design. Package included support for graphical analysis (using gnuplot.)   Also developed reliable multicast test scripts as well as 802.11 QoS test scripts using this framework.  Developed pass/fail criteria using statistical analysis and using control charts. Modified open source iperf 2.0.4 (written in C/C++) to meet the needs of the test framework requirements, particularly synchronization and control over distributed instances.  Extended automation environment with an interactive mode using a pure TCL readline that has been extended to work with SNIT objects. Wrote a simple IGMP querier in C (compiled for Linux and Windows).

Enhanced iperf and released it via open source, GPL license.

Networking skills include 802.11, all aspects of L2 ethernet, and RF multicast. Development skills include TCL, object oriented TCL (SNIT) and PHP, C/C++ when needed.  Devices under test include boh embedded systems and device drivers for major commercial operating systems including Windows (and it's variants), Linux, and MAC OS.

Cisco Systems, QA Engineer, San Jose, CA    December 2004 - September 2009

Senior development test engineer:  Performed as  a QA engineer for IPv4 and IPv6 Multicast testing Cisco IOS on the Catalyst 6500 hardware platform. Responsible for feature testing IP multicast including IPv4 and IPv6, Sparse Mode (SM), Source Specific Multicast (SSM), Multicast Netflow Accounting and other features that assigned per release needs.  Job requirements were to plan, document and execute manual testing as well as write feature test scripts to run as automated regression.  Also wrote 20K lines of TCL to support feature testing in a semi-automated environment.  Created, prioritized and tracked defects using defect tracking tools, presenting status at weekly, cross functional, bug scrub meetings.

Intoto Incorporated, Application Engineer, Santa Clara, CA    June 2004 – November 2004

Application Engineer: Worked in the marketing department as an application engineer supporting Intrusion Prevention Systems (IPS) and parental control, web filtering, software products. Setup demos on customer premises, evaluated competitors products, and represented the company in a technical capacity at industry trade shows.

Capacitive Networks, Cupertino, CA    February 2000 – June 2003

Started a small company with plans to develop a home media server. Performed market analysis to define the product. Attended conferences to look for business partners and evaluate competition. Worked with Darden School at UVA in attempts to define a viable business model. Negotiated and hired support services such as accountants and attorneys.  Recruited and enlisted an advisory board of industry leaders. Presented plans to outside investors. Managed personnel and contractors with a variety of skills. Developed product description including hardware and software definitions. Implemented an early PC based prototype using a Linux server, MPEG-2 decoders and RF modulators. Performed system and network administration for the office network and computers.

Cisco Systems, Software Engineer, San Jose, CA    March 1994 - February 2000

Carrier Class Remote Access Server: Senior member of an engineering team responsible for implementing a carrier class remote access server capable of terminating 8,000 DS0 terminations (ingress) and supporting gigabit Ethernet and ATM ports (egress). Evaluated marketing product requirements and wrote system functional specification used by a team of 20 software engineers. Worked with hardware engineers to define system hardware requirements and assisted in the evaluation of HW vendor offerings.

Technical lead for the software engineering team. Team was responsible for the design and implementation of a distributed packet forwarding which scaled with linecard insertion. Control plane required integration of multiple IPC mechanisms used to manage the switch fabric, DSP pools, and forwarding information databases. Individual software development contributions included the system boot up code and a Gigabit Ethernet driver.

Multi-CPU Forwarding Engine: Evaluated integrating four MIPs cores with multiple internal buses and internal packet memory onto a single chip to be used as a software based, IOS feature forwarding engine. Determined that the effort was insufficient and using in-house ASIC or alternative programmable forwarding technology such as Cisco's PXF deprecated the need for this project.

Token Ring VLANs: Led software team responsible for developing the token ring VLAN implementation for the Catalyst 5K and 6K router modules. Designed and implemented microcode which supported concentrator relay functions (CRF) and bridge relay functions (BRF) needed to seamlessly support IOS and SRB, SRTB, and routing.

Router Blade Development: Key member of hardware and software team responsible for designing and implementing a router blade for the Catalyst 5000 switch. Architecture achieved performance requirements for CPU based forwarding, realized inter-vlan routing and fallback bridging, and supported ASIC based IP switching (in a concurrent development effort). Integrated the full IOS feature set into the chassis. Developed software to schedule DMA engines, device drivers to support inter-processor communications, and message processing action routines. Designed and developed the code responsible for booting the module, requiring messaging between five asynchronous CPUs.

LAN Emulation QA and Testing: Designed and developed TCL scripts which verify Cisco's LAN Emulation feature. Tests cases include verifying the LAN Emulation Client, LAN Emulation Server and Broadcast Unknown Server software on a variety of ATM attached Cisco platforms. Delivered scripts to test engineers for continual regression testing.

Router QA and Testing: Member of a team responsible for testing Cisco's 7500 high-end router. Features tested included bridging and routing with attention to forwarding performance. Also developed test software to verify file system code for a PCMCIA flash drive.

IBM, Software Engineer, Houston, TX    January 1990 - March 1994

Member of the engineering team which designed and developed a FDDI Network Interface Adapter (NIA) for the Space Station Freedom. Developed the IP interface driver allowing TCP/IP to utilize the adapter. Evaluated message latency, CPU utilizations, and system throughput of the system architecture. Due to CPU bottlenecks, ported TCP/IP code onto the FDDI adapter processor. Developed code extending the socket interface across a Multibus II backplane to a host processor.

Developed a FDDI device driver, SMT protocol decode software, and a user interface for an internally developed FDDI test adapter. Developed automated test procedures verifying FDDI standard compliance. Delivered documented test procedures and test results to NASA.

Developed TCP/IP client/server code to measure network performance of a Fiber Channel attached RISC 6000. Project lead of the team responsible for testing this Fiber Channel adapter. Developed plans and schedules to complete product verification test and customer environment test on the adapter and associated AIX device drivers.

Other tasks included participating in requirement, design and code reviews of other flight firmware. Developed software to remote IPL a diskless workstation. Designed and developed diagnostic software to verify hardware of the Network Interface Adapter.

EDUCATION

Washington University, St. Louis, Missouri BS in Electrical Engineering, December 1989
Austin College, Sherman, Texas, BA in Mathematics, July 1987

CONTINUING EDUCATION

UCSC Machine Learning Fundamentals, 2015

OTHER

Enjoy to mountain bike and road bike (see routes here).  Run my own internet servers at colos in Dallas and Fremont supporting community sites such as BSA Troop 581.  Adult leader for Boy Scouts of America for 12 years.

References available on request.  Code samples available upon request.  Small GPL samples found here for iperf2, tcl every and tcl readline