Sylwester Madej
Staff Android Developer at Housecall Pro
Poland
Summary
🤩
Rockstar🎓
Top SchoolSylwester Madej is a Staff Android Developer and mobile security specialist with 14+ years of Android development experience and a decade focused on application security, training, and penetration testing. He leads mobile security at Housecall Pro for a platform serving 100k+ users, runs a long‑running OWASP Mobile Top 10 workshop taught since 2015, and has trained 100+ developers to reduce real vulnerabilities. He blends deep Android internals knowledge—APK reverse engineering, dynamic analysis and secure architecture—with hands‑on offensive skills (eMAPT) to find issues others miss. Equally comfortable as a developer and educator, he helps startups and enterprise teams improve architecture, speed-to-market and security without slowing delivery. He also explores security implications of AI-assisted development and prompt injection, bridging traditional mobile security with modern AI practices. Based in Poland, he pairs practical consulting and training at SzkoleniaAndroid.pl with ongoing research and conference speaking in Android security and agentic AI.
13 years of coding experience
6 years of employment as a software developer
MSc Computer Science, MSc Computer Science at Warsaw University of TechnologyPostgraduate Degree Cybersecurity Management, Postgraduate Degree Cybersecurity Management at Kozminski UniversityMSc Computer Science, MSc Computer Science at London South Bank University
Polish, English, Italian
Github Skills (27)
android-development8
unit-testing7
java7
rest-server7
android7
crowdfunding7
kotlin6
material-ui6
testing6
android-emulator5
rest5
api5
espresso5
server4
linkedin4
Programming languages (2)
Github contributions (5)
smdremedy/KittenContactsGenerator
Jun 2012 - Jun 2012
Contributions:2 commits in 1 day
smdremedy/pinafood
Sep 2014 - Feb 2016
Contributions:30 commits, 19 pushes, 1 branch in 1 year 5 months
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