About / Fajar Donny Bachtiar
Software is my work.
Making it fit is my focus.
A Delphi engineer,
with the whole system in view.
I'm Fajar Donny Bachtiar, a Senior Delphi Software Developer and System Architect based in Yogyakarta, Indonesia. I have more than five years of experience designing, building, and maintaining business applications with RAD Studio and Object Pascal.
I currently work as a Senior Software Developer at Medad LLC. I previously worked as a Software Engineer at PT. Pilar Data Esensia, developing mobile applications and services for Electronic Medical Record systems. I also work on independent projects as a freelance system architect.
My main stack includes Delphi FireMonkey and VCL, REST APIs, WebSocket, FireDAC, PHP, and relational databases. I work across application interfaces, backend services, integrations, and data access.
I studied Computer Science / Technology at University of Technology Yogyakarta. I also publish practical Delphi tutorials through the Blangkon FA YouTube channel.
See the project archiveCompetencies
What I work with.
Application development
RAD Studio and Object Pascal. Delphi FireMonkey / FMX for Android, iOS, and Windows, plus Delphi VCL for Windows desktop applications.
Backend & integration
REST API and WebSocket development, WebBroker, DataSnap, PHP, JSON, and server-side integrations.
Databases & data access
FireDAC with MySQL / MariaDB, SQL Server, Firebird, and SQLite.
Engineering approach
Readable Pascal, maintainable units, clear validation, and business logic separated from data access. Existing project structure and compatibility guide implementation choices.