Owen Kieffer-jones
Freelance Web Developer at Self-employed
Stuttgart Region Germany
Summary
👤
Senior🎓
Top SchoolOwen Kieffer-jones is a seasoned full-stack web developer with 11 years of experience building e-commerce platforms, web apps, and API integrations, now working freelance from the Stuttgart region. He combines hands-on proficiency in TypeScript, Node.js and PHP with architecture, database management and server administration to deliver polished user experiences and reliable back-end systems. At OUTLETCITY AG he helped architect and implement a technical relaunch of a major e-commerce site, and previously led frontend efforts and guided technical direction at an agency level. He contributes to open-source tooling for PHP testing and data generation—improving IBAN generation and test coverage in the widely used Faker library—demonstrating attention to correctness and cross-locale functionality. Colleagues value his knack for translating complex requirements into elegant, maintainable solutions and for mentoring teams on frontend best practices. He brings a practical, detail-oriented mindset that balances rapid delivery with long-term architectural quality.
11 years of coding experience
17 years of employment as a software developer
Computer and Information Science German, Computer and Information Science German at The Ohio State University
English, German, Spanish, American Sign Language, Dutch
Stackoverflow
630reputation
424kreached
12answers
2questions
Github Skills (15)
unit-testing10
php10
test-driven-design10
refactoring9
codelist8
coding-style8
ajax6
internet-explorer6
svg6
google-chrome-extension6
javascript6
browser-detection6
phpstorm6
jquery6
user-agent6
Programming languages (12)
Github contributions (5)
fzaninotto/Faker
May 2015 - Sep 2016
Faker is a PHP library that generates fake data for you
Role in this project:
Back-end Developer
Back-end DeveloperContributions:22 commits, 9 PRs, 43 comments in 1 year 3 months
Contributions summary:Owen primarily focused on improving the IBAN (International Bank Account Number) generation functionality within the Faker PHP library. Their contributions included fixing bugs in the IBAN generator, refactoring the checksum calculation into a dedicated class, and adding unit tests to ensure accuracy. They also addressed code style issues and made the `iban()` method public, enabling the generation of bank account numbers for various locales. Additionally, the user implemented and extended the `bankAccountNumber()` method to support different locales.
php-library
okj579/transatlantictaste
Jan 2024 - Aug 2025
Contributions:11 PRs, 44 pushes, 9 branches in 1 year 6 months
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