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Fajar Nanda Gustiawan

@fajarnandagustiawan

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Mobile Developer at PT. Baron Biondi William who built Mini ATM Hokki’s secure banking flows for Android EDC.

Indonesia

Message

At PT. Baron Biondi William, I developed and maintained production Android and Flutter apps across fintech, banking, and enterprise domains. For Mini ATM Hokki, I implemented fund transfer, withdrawal, balance inquiry, and deposit flows on Android EDC hardware using ISO 8583.

I also extended Lestari Mobile, adding Adjust analytics, a revamped account-opening flow, and cardless transactions, and built LestariGo as a separate Flutter product. At SaleSmart Indonesia, I developed offline-first features for a sales force automation platform, including Realm-based storage and batch syncing.

Experience

Work history, roles, and key accomplishments

Current

Mobile Developer

Current

Self-employed

Jan 2026 - Present (10 months)

Built a vehicle-based car rental tracking and booking platform, collaborating with a backend developer and marketing lead. Solely responsible for the full Flutter mobile app, reaching early traction with 1 paying client.

Flutter UI UX Booking Flows Vehicle Tracking

Current

Android Developer (Part-time)

Current

SaleSmart Indonesia

Jan 2023 - Present (3 years 10 months)

Developed Salesmart, a sales force automation platform with offline-first architecture, dynamic menu and form builder, batch sync, location-based validation, and real-time sales reporting.

Android Realm DB REST APIs Location Based Services Offline First Dynamic Forms Real time Reporting

Current

Android & Flutter Developer

Current

PT. Baron Biondi William

Jun 2020 - Present (6 years 5 months)

Developed and maintained 10+ production Android and Flutter apps in a small team, covering fintech, banking, and enterprise domains. Built Mini ATM Hokki, Lestari Mobile, LestariGo, Danareksa Mobile, and three additional Flutter m-banking apps.

Kotlin Java Flutter React Native Android SDK ISO 8583 Adjust VideoCall SDK Clean Architecture BLoC Provider GetX REST APIs Firebase Git

Junior Programmer

PT. Gria Inovasi Teknologi

Mar 2019 - Jul 2020 (1 year 4 months)

Developed Sifataru, an internal web application for Kementerian ATR using .NET Core, and built PDAM Tirta Kahuripan with GIS integration. Also developed Hajj-Scanner, an Android app for QR/RFID-based attendance tracking.

.NET Core ArcGIS Android Java QR決済 RFID