Jon Mayo / Software Engineer
I am a software engineer with over ten years experience
developing embedded products running Linux, QNX and vxWorks. I have
worked on everything from communications to storage systems, from
consumer products to enterprise servers. I desire to work with
talented people on products that strive to achieve the best quality
I am experienced at developing UNIX drivers and applications
(Linux, BSD, Solaris), embedded systems and networking appliances.
I have also used many different processor architectures, including
PowerPC, MIPS, ARM, dual core ARM/Cortex-A9, multi-processor
x86/i386 and x86-64/AMD64.
970 Meridian Ave Apt 38
San Jose, CA 95126
Home: (408) 647-1369
Cell Ph: (408) 216-3226
- Mastery of the C Programming Language. (standard ISO 9899-1990
and 9899-1999 specifications.)
- Over 15 years programming experience. (10+ years as a
professional software engineer)
- Experienced in assembly language for i386, x86-64/AMD64/EMT64T,
ARM, ARM Thumb, MIPS, and PowerPC.
- Nvidia Tegra 2 AP20 development of both Ubuntu/Debian Linux and
- Ubuntu/Debian packaging system (.deb) using dpkg and apt.
- X11/Xorg core development. XInput drivers, configuration, Xlib
and XCB based applications and window manager development.
- Multitouch touch panel driver and gesture development.
- Knowledge of digital and analog electronics. (2 year training
- Operation and software development on UNIX and clones: Linux
(i386, x86-64/AMD64, MIPS, PowerPC, ARM/Cortex-A9), MacOS X,
FreeBSD, NetBSD, OpenBSD, SunOS/Solaris, AIX.
- Source control tools: Git, CVS, Perforce, and Subversion.
- Bug tracking systems: Bugzilla, Jira, TRAC, and others.
- Debugging with JTAG and serial port (remote gdb - GNU
- Modifying, porting and extending the Linux kernel (nfsd,
scheduler, PCI subsystem, memory manager, TCP/IP,
iptables/NetFilter, boot/initialization, multitouch devices and
more) to change behavior, fix bugs or improve performance on
different architectures (ARM, x86_64, PowerPC, MIPS, i386).
- Drivers for vxWorks, QNX, Linux, DOS, u-boot and
- CGI/FastCGI web programming in C for embedded devices (vxWorks,
- Client-Server and Peer-to-Peer networking application
implementation and design
- Small custom webserver with built-in TCL scripting using a
light weight SQL database (SQLite)
- Software design documentation (troff, html, DocBook)
- u-boot development: driver, diagnostics and new features.
- ANSI FORTH and specialized version such as Open Firmware,
pforth and CM Forth.
OPEN SOURCE EXPERIENCE
- Stack-based scripting language that integrates easily with any
C program. (Forth clone)
- Custom bootstrap and kernel (picokernel) with non-preemptive
scheduler and simple memory management. Designed for embedded
- Abstracted a network server library that could use the
following transparently: select() with 3000 connections,
kqueue/kevent with nearly 100000 connections, sigtimedwait (POSIX
equivalent to kqueue/kevent).
- Three different online text-based adventure/role-playing game
servers (also known as a MUD).
- A small limited user-space threading library for POSIX and
Windows systems. Allows the creation of thousands of threads
without having an impact on system performance. The limitation is
that the threads are cooperative, the purpose is to eliminate
complex state machines and use an execution context. (uses the
POSIX calls setcontext/swapcontext/getcontext) and Win32
October 2009 – May 2010:
System Software Lead
5155 Old Ironsides Drive
Santa Clara, CA 95054
Led a Linux platform software team to implement device drivers,
services and core X11 components.
October 2007 – October 2009:
Senior Software Developer
a division of Amazon.com
20450 Stevens Creek Blvd.
Cupertino, CA 95014
Platform developer for the Amazon Kindle e-book reader. Linux
system development, build tools, bootloader development.
June 2007 – October 2007:
Senior Member of Technical Staff (MTS)
3401 Hillview Ave
Palo Alto, CA 94304
Developer for ESX Server product, a virtualization product for
x86 platform running a custom operating system kernel with a Linux
January 2007 – May 2007:
Senior Software Engineer
110 Baytech Drive, 2nd Floor
San Jose, CA 95134
Create a new Linux based platform environment for a
multiprocessor, clustered networking appliance for deep level
April 2005 – January 2007:
Linux Kernel Developer
Cisco Systems, Inc
170 West Tasman Dr
San Jose, CA 95134
Maintain existing open source and proprietary patches for the
Linux 2.6 kernel, as well as develop drivers for back plane
protocols. Provided engineering support for about sixty open source
applications, utilities and development tools. Automated GNU cross
compiler builds for i386, MIPS64 and PowerPC.
Modifications to u-boot bootloader to support custom hardware,
and enhanced with features for USB booting.
- GNU C Compiler (gcc): Intel x86, MIPS64 (Cavium and Broadcom
April 2004 – April 2005:
Linux Kernel Developer / QA Developer Agami Systems, Inc. 330
Gibraltar Dr Sunnyvale, CA (408) 349-0400
Kernel Job Description
Linux kernel developer for an enterprise NAS product. Applied
patches from the linux community to fix bugs, including
back-porting patched for newer kernel version to the NAS’s older
kernel. Added a proc interface for statistics collection. Added
ioctls to control nfs server behavior. Implemented 64-bit atomic
operations for i386. Tracked down and fixed many bugs.
- kgdb (kernel debugger)
- GNU C Compiler: Intel x86 and AMD 64-bit architectures
QA Job Description
Test developer for an enterprise NAS (storage) product.
Implemented and maintained low-level data path performance and
functionality tests in C, shell script, expect and TCL. Debugging
of Linux kernel and custom kernel modules using kgdb.
- Scripting languages: expect, TCL, shell script
- Source control tools: Perforce, CVS
- Bug and test tracking systems: bugzilla, testlink
- Test automation harness: STAF
August 2002 – September 2003:
Pillar Data Systems
2840 Junction Ave
San Jose, CA 95134
Software Engineer developing high availability NAS and SAN
storage products running QNX and Linux.
- Performed performance evaluation of Xeon2 and Pentium-4
architectures with Linux and QNX kernels. (for SMP and
- Designed and developed tracing and debugging tools as a kernel
service to allow postmortem diagnostics of the interaction between
multiple servers. Required the development of specialized atomic
counters for SMP systems.
- Redesigned system CORE dumps to remove certain bulky data
sections and to be compressed directly into battery-backed
- Worked on a project to replace QNX kernel messaging interface
with a zero-copy interface to eliminate the major bottleneck in
performance on QNX. (messaging is used like system calls in
- Used the IO APIC(Intel Xeon/P4) for sending interrupts/messages
between processor. This allows messages to be sent to another
processor or broadcast to all processors. This is necessary for
effective use of SMP.
- Source control tools: Perforce, CVS
- GNU Compiler and related tools (gcc, gdb, ld scripts,
April 2002 – August 2002:
IT Contractor / Software Developer.
Pioneer Research of America
2833 Junction Ave # 100
San Jose, CA
- Maintain a network of MacOS X and Linux workstations
- Changed network over to use NIS+ (aka ypbind)
- Installation of servers, including a video streaming server and
RAID storage server.
Implemented the initial EPG(Electronic Program Guide) software
for StingRay. (a set-top box personal video recorder)
August 1999 – August 2001:
Embedded Software Engineer.
DIRECTV Broadband, Inc. (formerly Telocity, Inc)
Embedded Software Engineer for vxWorks and embedded Linux.
(Residential DSL Modem / Router / Firewall) Responsible for
maintenance and development of various applications on the DSL
Gateway including: DHCP server, HTTP server, software download
protocol, project Makefiles, CGIs for HTTP server, bug fixes in
nearly any part of the product (application and driver layer),
design documentation for new products.
- Created a protocol specification to allow for remote firmware
updates to the DSL modem. This gave the company the power to repair
issues without the expense of reissuing a new modem to all
customers. Saving the company nearly a million dollars in the first
year it was used.
- Managed revisions of the company documentation for the protocol
- Coordinated meetings with other departments to review new
- Developed testing procedures to be used by QA department.
- One of the main experts on all of the company’s products.
- Linux kernel development. Ported Linux to a brand new flavor of
MIPS. Worked on TCP/IP subsystem and iptables/NetFilter. Linux
kernel drivers and internals.
- WindRiver Tornado, an integrated debugger, monitor, and shell
for embedded systems running vxWorks.
- Debuggers: gdb/ddd and brief experience with SoftICE.
- GNU and BSD Make (Have created very powerful, modular Makefiles
for large projects).
- Bourne Shell (sh/bash) Scripts to automate testing and other
often repeated tasks.
- Source control tools: CVS, VSS
- ICE (in-circuit emulator) for PowerPC 850 and 860.
- Configuring and compiling GCC as a cross-compiler. (MIPS,