Elixir Developer in Fairfax, VA, United States
T. Rex (President)1990 - PRESENTCodosaurus, LLC
- Run all aspects of the company, doing the client work, marketing, bookkeeping, IT support—everything! This was full-time from 1990 to 1992, part-time (evenings, weekends, and between "permanent" positions) until 2011, and has been full-time again since then. (NOTE TO EDITORS, PLEASE LEAVE THE PRESENT-TENSE PARTS OF THIS IN PRESENT TENSE, DO NOT MAKE THEM PAST TENSE, I AM STILL DOING THIS!).
- Add features, fix bugs, mentor junior developers (in Ruby, Python, and testing), improve code quality, and advise on tools and processes for a high-assurance guard project, plus a CORBA IDL to YAML translator, for the US federal government (via a prime contractor), in Ruby (with Sinatra), Python, and C. Also helped "roadmap" parts of this and other projects and brought up (and sometimes got to implement) ideas to save time and labor. (NOTE TO EDITORS, PLEASE LEAVE THE PRESENT-TENSE PARTS OF THIS IN PRESENT TENSE, DO NOT MAKE THEM PAST TENSE, I AM STILL DOING THIS!).
- Added features and fixed bugs in a Ruby on Rails retail sales floor planning system, plus a Ruby on Rails API-based query-answerer, for RBM Technologies (via Toptal). Helped define a new version of a custom query language, added new types of queries, added the ability to download results in CSV format, removed redundant data copying, removed redundant request types, converted a query answerer from a microservice to an engine, and packaged it as a gem. This resulted in bringing query time down from half an hour to, on average, just over half a second; worst case on known common queries was about two seconds.
- Added features and fixed bugs in the coaching section of a Ruby on Rails wellness portal for Onlife Health (via RaveTec). Introduced the use of videos for an end-of-sprint demo, reducing the chance of error during live demo. Created developer onboarding documentation on how to set up Onlife's apps and others needed in a development environment.
- Split a service creation platform into API and UI halves for Verisign (via Celerity IT), for easier scaling. Designed the RESTful API and implemented it in Ruby on Rails. Updated Cucumber/RSpec tests and Python/Java bulk upload tools. Investigated migrating its data storage from MySQL to Riak or NuoDB. Helped out with random other projects and a friend's classes teaching Ruby.
- Enhanced and repaired Ruby on Rails database table administration web apps for Retrieval Systems Corporation (direct client). Also advised the president and general counsel, and some dev staff, on techniques like pair programming, test-driven development, Agile project management, and other practices conducive to high software quality.
- Added email contact retrieval to a newsletter subscription manager in Ruby on Rails for HomeActions (direct client). This included adding abilities in the Omnicontacts gem to download contact info from additional online services. Also made the upload importing happen in the background so the user could proceed with other work, fixed several bugs, refactored the code to make later addition of other email providers easier, and advised on test-driven development and other quality-enhancing development practices.
- Adapted desktop Ruby on Rails views to mobile (mainly splitting up long forms) for Barclaycard (via Object Systems Group, as a temporary employee of theirs). Also came up with ways to ensure that the desktop and mobile views were in sync, helped BAs develop and triage use-cases.
- Fixed bugs and added features in an event networking and session scheduling site in Ruby on Rails for Halfaker and Associates (as a temporary employee), such as profile completeness checks, day-by-day agenda view, "more like this" for sessions, detection of room booking conflicts, reports in various formats such as PDF or CSV, and having those generated in the background and emailed instead of making the user sit and wait.
- Created a minimum viable product for a financial portfolio rebalancer in Ruby on Rails for a private individual client. This included educating the client on what a web app might be able to do in such a case.
- Created a tweet retriever in Ruby on Rails for Atomic Broadcast as part of a potential application to filter social media output.
- Enhanced a Python group email/SMS system for Anteon (via Liqwid Networks). Added features such as sending email to individuals instead of only groups, uploading files of new users, forwarding messages, admin notifications of new users, monitoring an email address for notices to forward, reports, better workflow, and assorted security restrictions and other robustness.
- Created a fax board initialization and diagnostic program in C for Send2Fax and configured their server to use it.
- Created a tool to fix corrupted dBase III files, in C.
Volunteer1985 - PRESENTMiscellaneous
- Release open source projects, both mine and others'. Some still can be found on GitHub, and others have been lost to the sands of time, mainly dial-up BBS utilities, MS-DOS screensavers, and text file manipulation utilities. (EDITORS: DO NOT CHANGE TENSES!).
- Serve as Speaker-Mentor, CfP-finder, and assistant CfP-list maintainer, for Toptal's Speakers Network.
- Speak at technical conferences worldwide, and Washington-DC area technical meetups. Spoke at DevConf Poland 2018 and CodeCamp Chisinau 2019; scheduled to speak at NDC Oslo 2019, BCS SPA Software In Practice 2019, Abstractions II (2019), and American Mensa Annual Gathering 2019; was a backup speaker at RubyNation 2018. Spoke mainly on software quality, Ruby, and mutation testing. (EDITORS: DO NOT CHANGE TENSES!).
- Founded, and still run, the LinkedIn “Plain Old C Programming” group; manage LinkedIn “Rubyists” and “Ruby on Rails” groups; and managed Google Plus "Ruby Programming Language community" until Google Plus went away. (EDITORS: DO NOT CHANGE TENSES!).
- Serve as organizer (president) of the "DC Computer Consultants" (remnants of ICCA of Greater Washington), and "Independent Consultants of NoVa, DC, & MD" Meetups. (EDITORS: DO NOT CHANGE TENSES!).
- Serve as an electronic participant for IETF (Internet Engineering Task Force); credited for input in RFC 3458. (EDITORS: DO NOT CHANGE TENSES!).
- Serve as webmaster for Metropolitan Washington Mensa and Fairfax Toastmasters. Served as webmaster of District 29 Toastmasters and Mount Holyoke Club of Philadelphia. (EDITORS: DO NOT CHANGE TENSES!).
- Created and organized Ruby DAY Camp 2013 (an overflow event for Ruby DCamp).
- Contributed to “C Secure Coding Standards” book and website for CMU SEI CERT.
Developer IV2010 - 2011Rosetta Stone
- Created and enhanced games and related tools such as content-set editors.
- Added new pages to a Ruby on Rails site engine, modifying the controller and views.
- Mentored junior staff by reviewing code and conducting software engineering training.
- Proposed ideas for new games.
- Integrated with components from other teams or third parties (such as web analytics).
Senior Software Engineer2009 - 2010Comcast Cable
Technologies: Ruby, Python, Perl, Shell Scripting, OS X, Linux, Kerberos, Jira, Subversion
- Wrote Ruby, Python, and Perl programs to record device performance data.
- Created a Ruby on Rails web application to record and estimate the risks of projects, broken out by various types of risk.
- Created a data file clearinghouse to streamline the data-file transfer agreement process, in bash script.
- Assisted in the security design and implementation for a single-sign-on effort.
- Elicited requirements from other teams to determine needs for performance recorders.
Senior Lead Software Engineer2004 - 2009BAE Systems
Technologies: XTS/STOP (Secure OS), C, Java, Shell Scripting, Linux, Windows, CVS, Subversion
- Created multiple frameworks for rapid development of near-real-time data guards (traffic scrubbers) since our extant frameworks were too slow. Used those frameworks to create data guards for demos and for clients, including NRL (Naval Research Laboratory), NATO C3A (North Atlantic Treaty Organization's Command, Control, and Communications Agency), NTT Data, and other parts of BAE Systems.
- Developed a week-long training class on information security principles; how to install, use, program for, and administer STOP OS; how to use my main framework, and our main older one; and other BAE Systems products. Taught this class to NATO C3A (in The Hague), NTT Data (in Tokyo), Lockheed-Martin (in Ft. Worth, Texas), and assorted BAE Systems personnel (both the American company BAE Systems Inc., and its British parent BAE Systems plc).
- Architected the next generation of the DSG data guard system and wrote its internal message transport system. Helped analyze security flaws in the previous generation.
- Modified the STOP 6 OS networking stack to let it read and write raw Ethernet packets, to let it act as a DHCP server or client.
- Helped adapt Samba for use as an MLS (multi-level secure) file server for use on F-35 JSF (joint strike fighter) mission plans. Traveled to Ft. Worth to install STOP and our Samba at the Lockheed-Martin plant producing F-35s.
- Co-developed weekly CISSP (Certified Information Systems Security Professional) certification exam preparation classes for colleagues, and co-taught it for a full run of twelve weeks.
- Taught seminars on modern software engineering techniques such as pair-programming and TDD (test-driven development).
- Enhanced and maintained the STOP 7 operating system installer and a package installer/upgrader.
- Tested the functionality of most of our compatibility-patched versions of BusyBox and other open-source utilities, under STOP 6 and 7, and submitted the patches upstream.
- Founded a Toastmasters club (first new club in District that year) and served as president and webmaster.
- Won the Chairman’s Award for Innovation (for “helping F-35 get off the ground”); was nominated many other times for the Chairman’s Award for Innovation or for Transferring Best Practices.
- Won a Certificate of Achievement for Outstanding Service and Performance.
- Won a spot award for rescuing the company's reputation with a disgruntled client, which resulted in multiple man-years of additional business. Traveled to Charleston, SC to pair-TDD with their team lead many times.
Senior Software Engineer2003 - 2004Secure Software
Technologies: Python, C, C++, Java, OS X, FreeBSD, Linux, Windows, Subversion, i386 Assembler, Security
- Fixed and enhanced a static analyzer that inspected many different languages, in C.
- Fixed and enhanced a static analyzer that inspected binaries, not human-readable source code.
- Wrote Python static analysis plugins to find usage of mobile code or files in Java, and usage of the Windows registry in C or C++.
- Made memory leak hunting easier by enhancing the memory allocation library.
- Helped plan test procedures as part of a code quality initiative.
Senior Software Engineer2001 - 2001Cryptek Secure Communications
Technologies: C++, Windows, Linux, SourceSafe
- Wrote a monitoring program in C++ for Windows to detect frozen VPN devices (external versions of our network cards), save sniffer logs, and either power-cycle the frozen device or failover to backup device.
- Wrote requirements, use cases, and visual prototypes for a new management console for an IPsec (Internet Protocol Security)-based VPN (Virtual Private Network) using our network cards.
- Researched management GUIs of top ten IPsec-based VPNs and presented a competitive analysis to my supervisor and colleagues.
- Improved throughput by writing a utility to set the Ethernet MTU (Maximum Transmission Unit) on any version of Windows.
- Wrote a manual test plan for the current VPN management GUI.
Senior Software Engineer1999 - 20013Com
Technologies: C, C++, Unix (many varieties), Unified Messaging, Telephony, Lotus Notes
- Added VPIM (Voice Profile for Internet Mail) 3 to a Unified Messaging platform. Discussions in IETF Working Group creating the standard led to credit in RFC 3458.
- Enhanced and maintained a system for mobile non-SMS notification of office voicemail, using the normal mobile-account message-waiting indicator instead.
- Co-wrote a multi-process multi-threaded tool simulating 1,400 users per PC.
- Invented a way to change sound file speed, preserving quality better than simple interpolation while retaining greater speed than Fast Fourier Transforms; partially prepared the patent application, including a library containing the function.
- Added a Zmodem file transfer protocol to a telnet/dialup VT100 emulator.
- Added more languages to a text-to-speech server.
- Created SCE (Service Creation Environment) scripts to allow the UM platform to act as a client for an advertising server to support free cell phone service.
Software Engineer1997 - 1999Template Software
Technologies: C, SNAP (Proprietary Language, Libraries, and Development Environment), Linux, AIX, RCS
- Created an ORM for an EAI subsystem.
- Helped design a new GIS data format.
- Updated GIS format-translation and filtering functions and utilities to use the new format.
Software Engineer1995 - 1996Telemet America
Technologies: C, C++, Windows, OS/2, Visual Basic, MS SQL Server, SourceSafe
- Added new data items to be transmitted.
- Added new calculations to the display.
- Created a new sales contact tracking system.
- Ported data from the old sales contact system to my new one.
Branch Chief of Systems Engineering1992 - 1995R&K Engineering
Technologies: SQL, C, Pro*C (C with embedded SQL), Unix, Oracle, Object Pascal, FORTRAN, REXX, MS-DOS batch script, Windows, CMS
- Wrote and ran periodic and ad-hoc SQL queries on an Army real-property Oracle database, including figuring out how to extract the desired combinations of data.
- Developed a flexible SQL query constructor and result display, as part of a facility planning, tracking, and analysis system for the IRS (Internal Revenue Service).
- Documented and enhanced BRAC (Base Realignment And Closure) calculations in a COBRA (Cost Of Base Realignment Actions) program for the DoD (Department of Defense).
- Enhanced other real-property database management programs.
- Investigated potential new technology, fixed technical problems, provided general IT support, etc.
- Supervised and coached a programmer/technical support person.
Consultant1989 - 1990COMTEK Services
Technologies: C, VAX/VMS, VOS (Stratus OS)
- Created the user interface for MCI’s phone network monitoring and configuration system.
- Tested an alarm propagation subsystem for the network element configuration system.
Assistant Programmer and Analyst1985 - 1987BDM (Braddock, Dunn, & McDonald; now part of Northrop-Grumman)
Technologies: C, dBase, Clipper, Pascal, MS-DOS batch scripts, Fortran, MS-DOS, VAX/VMS, VOS (Stratus OS), CDC CYBER, HP PCL (Printer Control Language), GRiD-OS
- Wrote a system health monitor for the company VAX center.
- Wrote an idle process killer for the company VAX center.
- Researched same-user same-account inter-project security and accounting for the company VAX center.
- Wrote parts of a war game system for Air Force University.
- Wrote a weapons accuracy plotter for the JTSC (Joint Test Support Center).
- Wrote a generic-printer histogram plotter for the JTSC.
- Wrote a troop unit strength calculator and comparator for the CIA (Central Intelligence Agency).
- Enhanced a program to analyze or design (derive behavior from measurements, or vice-versa) various types of physical shock isolators for the United States Air Force.
- Co-wrote multi-process multi-threaded communications software to handle transactions sent over an X.25-like proprietary protocol for LexisNexis (who then hired me).
- ACRUMEN Software Quality Framework Presentation at Arlington Ruby Meetup (Other amazing things)https://bit.ly/acrumen-arlington-ruby
Presentation on my ACRUMEN Software Quality Framework, presented at Arlington Ruby Meetup (even though it's technology-agnostic). It runs about 30 minutes.
- ACRUMEN Software Quality Framework Presentation at DevConf.pl 2018 (Other amazing things)http://bit.ly/acrumen-from-devconf-poland-2018
Presentation on my ACRUMEN Software Quality Framework, presented at DevConf Poland 2018 (about 40 minutes).
- ACRUMEN Software Quality Framework "Lightning-Ball" Talk at Tech Talk DC Meetup (Other amazing things)https://davearonson.wistia.com/medias/0yrd83elyb
"Lightning-ball" talk (longer than a typical "lightning talk" but not full presentation-length) at the Tech Talk DC Meetup, about my ACRUMEN Software Quality Framework and in particular how testing can help with each of its six aspects.
- Rubocop Improvements (Development)
Pull requests to Rubocop, including making it allow certain styles it previously did not realize, but that I prefer, such as allowing braces on procedural one-line blocks but otherwise following "semantic" block delimiting.
- ACRUMEN Software Quality Framework Presentation at Joy of Programming DC Meetup (Other amazing things)https://bit.ly/jop-acrumen-talk
Presentation on my ACRUMEN Software Quality Framework, presented at Joy of Programming DC Meetup (about 30 minutes).
- Open Pantry (Development)https://github.com/openpantry/open_pantry/pulls?q=is%3Apr+author%3Adavearonson
Simplify overly complex code, add tests, and shut up a bunch of warnings (by making the code right, not just telling the compiler to shut up), for an open-source project to feed the hungry, in Elixir with the Phoenix web-application framework.
- Pull Request Roulette (Development)http://www.pullrequestroulette.com/
A site to match up open source projects on GitHub that have pull requests that need to be reviewed with people willing to do the review. Not all that much there now, but please see the README and the issues at the GitHub repo (https://github.com/davearonson/pull-request-roulette/) for what I have in mind for the long term.
- EOTS (Email of the Species) Gem (Development)https://github.com/davearonson/EOTS
Ruby on Rails gem for describing, showing, and accepting the forms for multiple kinds of email, arranged in a hierarchy. Each kind only needs to have its own specializations described and "inherits" the rest from its "ancestors" in the hierarchy.
- Hook Lying Syncer (Development)https://rubygems.org/gems/hook_lying_syncer
A Ruby gem to keep method_missing and respond_to_missing? in sync to make metaprogramming easier and more reliable.
- The Jobsmith (Development)http://www.thejobsmith.com/
The beginning of a job board I've been working on, on and off. Currently broken due to neglect; one of these years I'll get back to it....
- The Decider (Development)http://thedecider.herokuapp.com/
My first (visible) Rails app, done mainly just to show prospective clients that yes, I can do Rails, even though I didn't yet have anything public to showcase.
- Assorted Open Source (Development)http://github.com/davearonson
Assorted things I've released as open source; some are already included in this list individually.
- Ruby Gotchas (Other amazing things)http://bit.ly/RubyGotchas
Slides from my Ruby Gotchas presentation.
- Ruby on Rails Best Practices and Tips by Toptal Developers (Publication)This resource contains a collection of Ruby on Rails best practices and Ruby on Rails tips provided by our Toptal network members.
FrameworksRuby on Rails 3, Ruby on Rails 4, Ruby on Rails 5, WebApp, Ruby on Rails (RoR), minitest, Phoenix, Sinatra, Jasmine
OtherComplex Problem Solving, Problem Solving, Software, Software Engineering, Presentations, Leadership, Public Speaking, Software Design, GitFlow, Creative Problem Solving, APIs, Debugging, Ruby Gems, API Design, RESTful Microservices, RESTful Web Services, RESTful Services, RESTful Routes, RESTful APIs, Client-server Model, Presentation Design, Agile Sprints, Technical Instruction, Instructor-led Training (ILT), Training, Technical Training, Technical Consulting, Software Consulting, Technology Consulting, Consulting, Consultation, HTTP, SaaS, Security, Application Security, Web App Development
Libraries/APIsRails Engines, Ruby on Rails API, REST APIs, jQuery, GitHub API
ToolsGit Flow, GitHub, Git, Mercurial, Emacs, RSpec, Vim Text Editor, Subversion (SVN), Cucumber, Rake, Google Hangouts
ParadigmsRESTful Development, Scrum, Agile Workflow, Agile, Minimum Viable Product, Plain Old Ruby Object (PORO), Agile Software Development, Test-driven Development (TDD), REST, Imperative Programming, Class-based OOP, Behavior-driven Development (BDD), Unit Testing, Object-oriented Programming (OOP), Object-oriented Design (OOD), Functional Programming
PlatformsMacOS, Linux, Unix, Heroku, BSD, VOS, Oracle
StorageOracle SQL, JSON, PostgreSQL, MySQL, FlatFile, SQLite, NoSQL, NuoDB, Riak
- Advanced Communicator and Leader, Bronze (ACB/ALB) in Communication and Leadership2003 - 2016Toastmasters International - Rancho Santa Margarita, California, CA
- Bachelor's degree in Computer Science1984 - 1985Arcadia University - Pennsylvania