André Walker
Senior Software Engineer at Personio
Amsterdam, North Holland, Netherlands
Summary
👤
Senior🎓
Top SchoolAndré Walker is a Senior Software Engineer and tech lead based in Amsterdam with 15 years of experience building reliable, distributed backend systems and shipping product-facing features at scale. He has progressed through engineering and leadership roles at Booking.com and now Personio, where he focuses on architecting resilient services and mentoring teams. Early career work in payments and e-commerce in Brazil produced a shipped payment integration that became the site's primary checkout flow, showing a bias for pragmatic, customer-impacting engineering. André is also an active open-source contributor—his Perl work improving DuckDuckGo's Instant Answers demonstrates attention to data parsing, UX-facing search improvements, and thoughtful handling of edge cases like disambiguation and redirects. Known for blending hands-on coding with system design, he brings cross-cultural experience and a track record of turning complex requirements into production reality.
14 years of coding experience
10 years of employment as a software developer
Bachelor's degree Computer Science, Bachelor's degree Computer Science at UFSCar - AlumniColégio Técnico de Campinas
English, Portuguese, Dutch
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (9)
json10
http10
duckduckgo10
perl10
instantsearch10
regular-expression9
bash8
javascript4
python3
Programming languages (12)
Github contributions (5)
duckduckgo/zeroclickinfo-fathead
Jan 2015 - Feb 2015
DuckDuckGo Instant Answers based on keyword data files
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 commits, 1 PR, 12 comments in 26 days
Contributions summary:André primarily focused on enhancing the "DuckDuckGo Instant Answers" feature by creating and refining the HTTP headers instant answer. They wrote Perl code to parse and extract information from Wikipedia data, which was then formatted and outputted. The user also implemented redirection rules and disambiguation features to improve search result accuracy and user experience. Further contributions included the implementation of sorting for improved readability of the output file.
pythonjavascriptduckduckgoinstant-answersruby
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