Rob Janssen
Software Engineer at KeenSystems
Gemert, North Brabant, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolRob Janssen is a pragmatic software engineer with 14+ years building business-critical applications, VoIP platforms and backend services, currently developing Asterisk/Freeswitch/OpenSIPS solutions at KeenSystems in the Netherlands. He blends hands-on full-stack development (C#, .NET, PHP, SQL, JavaScript, HTML/CSS) with systems and DBA experience, having also acted as a recurring system administrator for production environments. An early contributor to open-source tooling, he authored a PHP TwoFactorAuth library and a .NET Snowflake-style ID generator, showing attention to security and unique identifier design. Comfortable in both lead-developer and engineering roles, he favors practical, maintainable solutions and mild product/UX design input. A longtime OpenBSD user and forum moderator, he pairs deep technical pragmatism with community-oriented problem solving.
14 years of coding experience
10 years of employment as a software developer
Various techniques, languages, technologies etc., Various techniques, languages, technologies etc. at SelfstudyElectrotechnology, Electrotechnology at MTS RoermondROC 's Hertogenbosch Technische informaticaMariaschoolROC Helmond Technische informatica
Dutch, English, German, French
Stackoverflow
8,617reputation
923kreached
215answers
45questions
mysql
top-5%
php
top-5%
html
top-5%
Github Skills (25)
algorithm10
algorithms10
code-generator10
dotnet-new10
dotnet10
codegen10
security10
two-factor-authentication10
php10
code-generation10
csharp10
totp10
qr-code10
mysql9
sha9
Programming languages (15)
Github contributions (5)
RobThree/TwoFactorAuth
Sep 2014 - Nov 2021
PHP library for Two Factor Authentication (TFA / 2FA)
Role in this project:
Back-end Developer
Back-end DeveloperContributions:23 releases, 19 reviews, 193 commits in 7 years 2 months
Contributions summary:Rob's primary contribution involves the creation of a PHP library for two-factor authentication. Their work includes the initial implementation of the `TwoFactorAuth` class, along with methods for secret generation, code calculation, and verification. Furthermore, the user added support for various QR code providers (Google Charts, QRServerProvider and QRicketProvider), and included a simple demo. Additional work involved improvements to code formatting, refactoring, bug fixes and incorporating more secure random number generators.
php-librarytwo-factor-authenticationqrcodephptwo-factor
RobThree/IdGen
Apr 2015 - Dec 2022
Twitter Snowflake-alike ID generator for .Net
Role in this project:Back-end Developer
Back-end DeveloperContributions:16 releases, 2 reviews, 121 commits in 7 years 10 months
Contributions summary:Rob was the initial contributor to the project, responsible for setting up the foundational elements of the ID generator. They implemented the core logic for generating unique IDs, inspired by Twitter's Snowflake design, within the .NET environment. The user focused on establishing the structure of the ID, including its components like timestamp, generator ID, and sequence number. The initial commit includes essential components such as the core ID generator class and a configuration class, laying the groundwork for the project.
dotnetsnowflaketwitter-snowflakec-sharpidgenerator
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