Senior Front-End & Mobile Engineer
NowRekosistemJakarta, Indonesia
2023-10 to now- roleFront-End & AI-Native Engineer
- basedJakarta, Indonesia
- statusOpen to new work
I'm Bintang. I build complete products, front-end to the edge.
Front-end first, four years in the React ecosystem. I built a cross-platform design-token system with its own build-time compiler, co-architected the ERP that won WSA Global 2025, and ship solo SaaS on the Cloudflare edge. The AI-native part is concrete: an MCP server and open-source Claude skills that teach assistants how my systems actually work.
Selected work
Things I designed and shipped
- 01
Lyra
A form builder for Indonesia with payments built in. Create a form, collect answers, and accept money on the same screen — Virtual Account, QRIS, and e-wallets render inline, settle to a creator wallet, and pay out to any bank. Built solo, end to end.
Next.jsReactTypeScriptHonoCloudflare Workers - 02
Aurora PDF
A serverless document utility tool using WebAssembly to execute PDF conversions, compressions, and local OCR parsing entirely within the user's browser runtime — eliminating external server overhead and ensuring complete privacy.
ReactTypeScriptViteWebAssemblypdf-lib - 03
Quasar
An all-in-one, privacy-first developer tools suite with 120+ data and code utilities that run entirely client-side. Built on a registry-driven architecture where a single source of truth powers routing, navigation, fuzzy search, and SEO — adding a tool is one entry plus a pure, fully tested engine function.
Next.jsReactTypeScriptVitestfast-check - 04
Stareezy UI
A fully typed, object-based design token system and cross-platform component library for React Native and web. Authored custom Babel and Vite compiler extensions to extract tokens at build-time into atomic CSS variables, delivering flat O(1) runtime evaluation metrics.
ReactReact NativeTypeScriptBabelVite - 05
Reko Mitra — Operational Mobile App for Field Teams
Mobile operational platform engineered for field officers and waste management partners, with a focus on offline resilience, local caching, and reliable sync under unstable network conditions.
React NativeExpoTypeScriptSWRZustand - 06
RekoHub — Enterprise Waste Management ERP Platform
Enterprise-grade ERP platform powering operational workflows across Rekosistem's sustainability ecosystem — unifying logistics, approvals, warehouse coordination, inventory management, and ESG reporting into a single cross-platform experience.
React Native WebExpoTypeScriptAWS AmplifySWR
Open-source record
Merged outside my own repositories
- #15044cloudflare/workers-sdk[wrangler] fix: normalize CRLF before sending D1 commands to the remote query API5 files+178−5
- #48471expo/expo[notifications]: suppress onUserLeaveHint from forwarder activity2 files+2−1
- #29963raycast/extensions[OSS Insight] Update trending repositories API4 files+29−22
- #29964raycast/extensions[Search npm] Add npmx.dev search results provider3 files+34−6
Where I've been building
#RolePeriod
02 Mobile Developer
PT. Extramarks Education Indonesia (Kelas Pintar)Jakarta, Indonesia
2023-04 to 2023-0903 Full Stack Developer
PT Nawa Data SolutionsSouth Tangerang, Banten
2022-10 to 2023-03
The toolkit, grouped by what it does
Interface
- React
- Next.js
- TypeScript
- Tailwind CSS
- Expo React Native Web
- PWA
Mobile
- React Native
- Expo
- EAS Build
- EAS Submit
- App Store Connect
- Google Play
Systems & state
- Design Token Systems
- O(1) CSS Registries
- Zustand
- Redux
- MobX
- SWR
Backend
- Go
- Hono.js
- .NET Core / C#
- REST APIs
- SQL Server
- MySQL
- PHP
Quality
- Jest
- Vitest
- Katalon Studio
- E2E Testing
- CI/CD
Cloud & AI
- Cloudflare
- AWS Amplify
- MCP Servers
- Claude Skills
- LLM Integration
- Prompt Engineering
- RAG
Notes from the build
Let's talk
Got something hard to build?
I'm looking for a senior front-end or systems role where I can own products end to end. Open to freelance and open-source too. Tell me what you're building.
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