/ 00 — AI Engineer · Full-stack Software Engineer
Ibuildthingsthatsurviverealcustomers.
For F&B and beauty brands, I work end to end — the logo, the space, and the software they actually run on: the page they take bookings through, the register they sell from, the assistant that answers at midnight.
Ask my portfolio anything. A retrieval assistant that answers from my actual projects — payments, offline, the AI work, my stack, or just “what are you good at?”. Runs entirely in your browser.
Signature feature — an AI assistant that answers from my work.
/ 02— Selected work
All work ↗These aren’t screenshots. Each one is the real product, rebuilt in code and running on its own.
AI Customer ServiceAgent gateway↗
ABAJ POS
ABAJ POSOffline-first desktop↗ABAJ Commerce OSBackend · back office↗/ One system, many surfaces
ABAJ isn’t four separate projects. The storefront, the delivery app, the register and the back office all run on one backend — change a price once and it moves everywhere. That’s the difference between building a page and building the platform a business runs on.
/03—Capabilities
Different jobs, same hands.
Marketing sites
Sites that load fast and look like the brand, with an admin the owner can actually run when they need to change something.
- Brand & landing
- SEO + OpenGraph
- Perf ≥ 95 Lighthouse
- Custom admin / CMS
Web apps
Scheduling, listings, carts, dashboards. Real payments and real state, typed the whole way through so it doesn’t come apart in month two.
- Booking & scheduling
- Search & filtering
- Payments (Xendit)
- Auth & roles
Products & tooling
A point-of-sale that keeps selling with the internet down, and internal tools built for the person on the shop floor, not the person watching the demo.
- Offline-first POS
- Receipt / ESC-POS
- Sync & devices
- Desktop (Tauri · Rust · C#)
AI & systems
AI that does real work — an agent that answers customers and calls live APIs — and the backends underneath it, kept close to the user.
- AI agents (Anthropic)
- Event store / webhooks
- Provider-agnostic adapters
- Rate-limiting & obs
Brand & business, end-to-end
For F&B and beauty, the software is the last mile — not the whole road. I help take a brand from nothing to open: the logo and identity, the physical space, and the system that runs it. One team from the name on the door to the register behind the counter.
- Logo & brand identity
- Space / place setup
- F&B + beauty focus
- Brand → build → launch
/04—Stack
Drag the cursor through it.
- React
- Astro
- Next.js
- TanStack Start
- React Router
- Vite
- TypeScript
- Tailwind CSS
- React Native
- Node
- Next.js API
- Astro Endpoints
- Drizzle ORM
- Zod
- REST / Webhooks
- Web Push
- Turso (libSQL)
- SQLite
- Vercel
- Upstash
- Sentry
- Xendit
- Tauri
- ESC-POS
- TypeScript
- Rust
- C#
- C++
- SQL
- Anthropic API
- Context7
/05—By the numbers
Real figures only.
/06—About
I’m Alexanders — I build products end to end, from the first pixel to the edge function. AI-assisted where it helps, hand-crafted where it matters.
Full-stack and AI engineer in Jakarta. For the F&B and beauty brands I work with, it usually starts before the code — the logo, the brand, the space itself — and ends in the software they actually run on: the booking site a beauty studio takes deposits through, the register a restaurant keeps selling from when the wifi drops, the AI that answers its customers on WhatsApp. I like the problems where the details decide whether it works.
/ 07 — Contact
Have something to build?
Booking, delivery, a landing page, POS, or something systems-heavy — tell me what you’re making and I’ll tell you honestly whether I’m the right person for it.