Jasm Sison
Freelance Mobile Application Developer
Randstad, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolJasm Sison is a seasoned freelance mobile application developer based in the Randstad with 16 years of experience delivering Android, iOS and Flutter apps across banking, healthcare, transportation and media. He combines deep mobile engineering skills with pragmatic system thinking, having worked on high-profile clients like ING, ABN AMRO, Rabobank, Schiphol and the Dutch Central Bank. Beyond app UX and platform work, he has strong backend and low-level expertise—contributing to the ObjectBox Dart Flutter database by improving FFI bindings, memory management and query builders. Comfortable in both solo freelance and embedded-team roles, he pairs hands-on coding with architecture and integration responsibilities. His background spans Java, C#, C++ and modern cross-platform Flutter development, enabling him to bridge legacy systems and contemporary mobile stacks. Colleagues describe him as a practical problem-solver who surfaces subtle implementation issues (like memory leaks) before they reach production.
16 years of coding experience
6 years of employment as a software developer
High School/Secondary Diplomas and Certificates, High School/Secondary Diplomas and Certificates at Niels Stensen College, middelbaar schoolBSc, computer science, BSc, computer science at University of Utrecht
Chinese, Tagalog, Dutch, English, German, French
Stackoverflow
1reputation
0reached
1answer
0questions
Github Skills (11)
dart10
foreign10
ffi10
cffi10
flutter-apps9
flutter9
flutter-game9
automated-tests6
windows-mobile6
compact-framework6
testing6
Programming languages (10)
Github contributions (5)
objectbox/objectbox-dart
Sep 2019 - Oct 2020
Flutter database for super-fast Dart object persistence
Role in this project:
Back-end Developer
Back-end DeveloperContributions:26 reviews, 106 commits, 16 PRs in 1 year 1 month
Contributions summary:Jasm primarily focused on refactoring and improving the ObjectBox Dart library, a Flutter database. Their contributions involved replacing the CString with a ffi utf util package, preventing memory leaks by correctly freeing allocated memory and implementing query builder and other related FFI functions, as well as adding tests. The user demonstrated a strong understanding of the library's internal workings, specifically concerning memory management and low-level bindings.
nosql-databaseiosmobiledatabasepersistence
Buggaboo/objectbox-dart
Jul 2019 - Feb 2021
ObjectBox for Dart/Flutter
Contributions:1 PR, 124 pushes, 41 branches in 1 year 6 months
flutterdartobjectboxflutter-dart
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