# James Luedke

> Software Engineer at Craigslist

Location: San Jose, California, United States
Profile: https://flows.cv/jamesluedke

I have been writing software since 1998. My recent projects have been high volume messaging and web services. I have developed large scale clustered solutions and written server daemons to run on distributed systems. I have years of software development experience in unix environments of various flavors, with a emphasis on performance and stability.

I have a few published open source projects including a Gearman php extension, and for a while i maintained the Drizzle php extension. Both can be found on the PECL website.

Specialties: 
Spam filtering
Large volume email and messaging platforms
Machine Learning
Abuse detection
Data analysis
Custom Servers
Clustered Computing
Distributed Computing
PHP performance tuning
PHP extensions

## Work Experience
### Software Engineer @ Craigslist
Jan 2009 – Present
Craigslist is a local classifieds and forums - community moderated, and largely free.

* Developed custom filtering software.
* Developed statistics and indexing platform.
* Developed many internal tools mostly related to spam and abuse fighting.

### Sr. Software Eng. @ XO Communications
Jan 2004 – Jan 2009
Concentric Web Hosting / XO Communications

* PHP performance tuning
* Custom C php extensions written to utilize XO's shared memory database
* Hacking of existing APC & FastCGI php extensions
* Maintain codebase for XO's custom webserver.
* Port Apache Mod_Rewrite to our custom webserver.
* Develope custom SMTP proxy spam filter to do filtering at the
  transport level.
* Wrote custom LDAP server.
* Implemented bayesian spam filters on Concentric email platform
* Extended and maintained Concentric Email platform

### Computer Assistant @ Monterey NPS
Jan 2004 – Jan 2004
Monterey Naval Postgraduate School, emphasis is on education and 
research programs that are relevant to the Navy, defense and national 
and international security interests

* Developed  application in c on an embedded x86 platform

### Unix Admin/Dev @ envision media
Jan 2002 – Jan 2004
EnabledSites provides wholesale dialup access via Radius authentication
through multiple dialup vendors such as (Qwest, Broadwing, etc). Via 
Proxy or Local RADIUS authentication/accounting.

* Developed robust Radius solution for both local and proxy customers.
* Designed accounting system used to track user usage, via Radius
  accounting, and provide our customers an accurate form of billing.
* Developed a MySQL Replication wrapper designed to allow 2 way
  replication of our radius accounting database.
* Led various Software Development projects.
* Built API for rapid devlopment of internet applications.
* Built backoffice system used to allow users to view there usage
  and modify there accounts.
* Built web based tracking system.
* Performed systems monitoring to ensure 24/7 uptime.
* Load balancing traffic shaping for high volume Web - Email - 
  and RADIUS servers.
* Installed Robust email solution for +30k virtual email users.

### Engineer, DBA @ Arrio Communications
Jan 2001 – Jan 2002
Arrio Communications, Inc. develops an internet based audio tuner that 
allows you to listen to live broadcast online without the use of a pc.

* Developed station database & tools in C, Perl & PhP.
* Created an encryption algorithm in C used to encrypt unit 
  protection register.
* Designed an authorization - logging utility with a SQL back.
* Wrote QA Test plan, and managed QA team.
* Debugged damaged audio tuner main boards.
* Reverse engineering of MMS and other media streams.
* System administration

### Software Engineer @ Sane.net
Jan 1999 – Jan 2001
Sane.net is a custom software consulting firm specializing in Unix 
application development in C and Perl.

* Developed a program in C to test the reliability and performance of 
  a dual UART serial driver written for a Handspring Visor module
* Assisted with design and construction of a low level communications 
  protocol written in C to test a customer product
* Setup an IPv6 testbed and established a static connection to 
  the 6bone
* Setup and maintained an SNMP testbed.
* Assisted with porting a spam filtering package from Solaris 
  SPARC to BSDi
* Maintained our network consisting of multiple platforms
  (Solaris, Linux, BSDi, AIX, and Windows)

### Web Developer @ Winter Harbor Group
Jan 1998 – Jan 1999
WHG is a web development/design firm. 

* Built a number of web sites including stockfood.com, cncsystems.com
* Developed custom JavaScript applications
* Created document templates to W3C standards using HTML/DHTML
* Performed Layout and Design using Adobe Photoshop and other 
  applications


## Education
### Cabrillo College


## Contact & Social
- LinkedIn: https://linkedin.com/in/jluedke
- Portfolio: http://jluedke.com

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Source: https://flows.cv/jamesluedke
JSON Resume: https://flows.cv/jamesluedke/resume.json
Last updated: 2026-04-10