Mekari Jurnal
Mekari · Android, iOS
Cloud accounting for Indonesian businesses. I'm the only mobile developer on Android and iOS, covering maintenance and new features.
100K+downloads
4.6on Google Play
90%+test coverage
KotlinSwiftFirebaseBitrise
Hi, I'm
Agung. Nursatria Banyuwiguna
Agung Nursatria BanyuwigunaSenior Mobile Engineer at Mekari
I build mobile apps that ship fast and stay up.
Senior mobile engineer at Mekari, building in Flutter, Kotlin and Swift since 2019. Today I'm the only mobile developer on Mekari Jurnal for Android and iOS and on Mekari ERP. I built the UI library 11 of Mekari's 14 apps run on, and on the side made Simpan, a notes app with 250,000+ downloads.
7+
Years shipping mobile apps
250k+
Downloads on Simpan, built solo
11/14
Mekari apps on my UI library
99.8%
Crash-free sessions at Fazz
Selected work.
The Mekari apps I run on my own today, the products I build as Banyu Dev, and what came before.
01
At Mekari
Apps I own today, and the one I launched
Mekari ERP
Mekari · Android
Warehouse operations on a phone: receiving, putaway, picking and stock counts. Sole mobile developer.
90%+test coverage
Mekari Stream
Mekari · Flutter
Snap invoices, receipts and bank statements, and OCR turns them into structured data. I led the mobile app from architecture to launch.
Test coverage0 → 98%
In productionOct 2023 — Jan 2025
FlutterFirebaseBitrise
Mekari retired Stream in January 2025. The app no longer ships, so there is no store link.
02
Built by me
Banyu Dev productsmoneymori.com
MoneyMori
Banyu Dev · Flutter, Go
Personal finance, calmly: budgets, goals and spending. From the Flutter app to the Go API.
FlutterGoSupabaseFirebase
asaruma.com
Asaruma
Banyu Dev · Flutter, Go
Family management for Indonesian households: money, notes, records and emergencies in one shared space.
FlutterGoNext.jsSupabase
mintchemy.com
Mintchemy
Banyu Dev · Next.js
An AI companion for product managers, from the first PRD draft to delivery tracking.
Next.jsSupabaseMCP
seumurhidup.com
SeumurHidup
Banyu Dev · Next.js, Go
Digital wedding invitations that greet each guest by name, with one QR from the door to the thank-you.
Next.jsGoFlutter
03
Earlier
Fazz, Reku and side projects
Simpan
Banyu Dev · Flutter
Notes, tasks, bookmarks, reminders and a password saver in one app. I did everything: features, UI design, build and support.
250K+downloads
4.7on Google Play
NotesTasksBookmarksRemindersAccount saver
Reku
Rekeningku · Flutter
Crypto investing for Indonesians. Mobile engineer and tech lead for four developers, owning stability and performance tracking.
FlutterFirebaseCodemagicDatadog
Neu
Fazz · Flutter
Budgeting, payments and investing in one app, built at Fazz.
neuTransferneuGrowneuBudgetneuGoldneuBills
Where I've worked.
Seven years, four companies, two degrees. Each line is paired with the number that proves it.
Universitas IndonesiaMaster of IT, 2020–22, finished in two years
Telkom UniversityB.Sc Informatics, 2015–19, finished half a year early
- Dec 2022 – Now
Mekari
Indonesia's business software suite: accounting, HR and more
Senior Software Engineer, Mobile I · Jakarta
Jurnal AndroidJurnal iOS
Mekari ERP
Mekari Stream · sunset4 apps
Mobile apps shipped and owned
Sole mobile developer on Jurnal Android, iOS and ERP; led Stream from architecture to launch
11 of 14
Shared UI library and theme
Built on the Mekari Pixel design system
29 alerts
Logging and alerting
Real-time anomaly alerts across every app
90%+
Test coverage on every app
Held above 90%; Stream went from 0 to 98%
3 apps
Architecture migrations
Projects moved onto one standard
In-house
Feature flags
Toggles, staged rollouts and A/B tests
FlutterSwiftKotlinFirebaseGrafanaFlagsmith - Sep 2022 – Dec 2022
Reku
Indonesian crypto trading app
Senior Mobile Developer · Jakarta
4 devs
Tech lead
Architecture redesign and team guidelines
Rebuilt
Logging and error handling
Faster debugging for developers and QA
FlutterSwiftKotlinFirebaseMixpanel - May 2019 – May 2022
Fazz
Fintech for businesses in Southeast Asia
Mobile Engineer · Jakarta
99.8%
Crash-free sessions
Performance, security and monitoring
3 apps
Apps built from scratch
Plus one existing app maintained
20+
Jira processes automated
Also the team's Scrum Master
5 people
Team coordinated
As tech lead and technical architect
24 people
Product team
PM, QA, design and engineering building the apps together
FlutterSwiftKotlinReactJavaGraphQLFirebase - May 2018 – Aug 2018
Suitmedia
Digital agency
Mobile Developer, intern · Bandung
Internship
Banking task monitor
Internal app, plus Mapbox research
JavaKotlinDagger 2RxJavaRealmMapbox
Along the way.
Competitions, community and the side project that found its audience.
Google Developer Kejar: one of 20 best learners from 2,000+
A little about me
Senior Mobile Engineer, Bekasi
Hi, I'm Agung. I've built mobile apps for seven years, almost all of it in Flutter. Most of my day is writing code: clean architecture, shared UI components, and the tests that keep every app I own above 90% coverage.
I like owning a feature end to end, from the API to the screen. My side projects run that way too: Simpan, which I built alone, passed 250,000 downloads, and MoneyMori pairs a Flutter app with a Go API I wrote.
I studied Informatics at Telkom University in Bandung, finishing half a year early, and took a master's in IT at Universitas Indonesia while working full time. Along the way I was a lecturer assistant and practicum coordinator.
In 2018 my team won first place in application development at IMPACT Inter-fest with Kumpul!, and Google named me one of 20 Best Kejar Learners out of more than 2,000. I've also interviewed mobile candidates at three companies and volunteered with Kawal COVID-19.
Agung Nursatria Banyuwiguna
Tools I reach for
Mobile
FlutterJavaSwiftKotlinFlutterFlow
Backend
Go
Frontend
ReactNext.jsTypeScript
Database
MongoDBFirebaseSupabase
Infra
DockerHerokuVercel
Tooling
FigmaGrafanaDatadogCodemagicJenkinsBitrise
Notes from the build.
Mobile architecture, Flutter at scale, and keeping apps crash-free.
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Say hello.
LinkedIn or email reaches me fastest. Code, packages and side projects live on GitHub.