/ 00 · AI Engineer · Full-stack Software Engineer
Ibuildwebsitesandappsforyourbusiness.
I help F&B and beauty brands build their identity, websites, and apps. From booking and checkout to daily operations, I design and build the tools behind the business.
Ask my portfolio anything. Ask about booking, payments, POS, native apps, or the tools I use. Answers come from information in these case studies.
Ask about the projects, features, and technology below.
/ 02 Explore the projects
All case studies ↗See what I’ve built.
Choose a project to see its features and main flow. Screens come from live products or original source. Open the case study for my contribution and implementation details.
Build the order. Take payment. Run the shift.
Designed and built by Alexanders Schwartzmann · end-to-end
- Cashier UX & React terminal
- Order & payment backend
- Kitchen & cash shifts
- C# printing integration
A restaurant POS for the counter: product search, item choices, bills, cash and EDC payments, kitchen tickets, and cash shifts in one workspace.
Follow the original POS 0.2.7 cashier workflow, from an order to payment, kitchen tickets, and the cash shift. Captures use a local sample outlet.
Build the order
Two nasi goreng and one iced latte make a Rp98,000 order. Quantity controls, item notes, saved bills, promotions, and the payment total sit together at the register.
Latest POS 0.2.7 · original cashier UI · sample outlet
- Cashier catalog, item choices & saved bills
- Cash change calculation & EDC payment records
- Kitchen tickets, cash movements & shift reports
React / TypeScript / C# / Next.js / Drizzle / Turso / ESC-POS
- The problem
- The counter, kitchen, and cash shift need to agree on the same order.
- What I built
- A cashier terminal with item choices, bills, payment records, kitchen tickets, and shift reports.
- What it enables
- Staff can follow an order from the counter to the kitchen and reconcile the shift’s cash.
Let’s build around your workflow.
/ One backend, connected products
ABAJ’s brand website, customer app, merchant app, and ERP connect to the same commerce backend. Valid POS now develops as a separate product, branched from the codebase in September 2026.
/03-Capabilities
What I can help build.
Marketing sites
Brand websites with clear content, fast pages, and an admin for updating services, photos, and information.
- Brand & landing
- SEO + OpenGraph
- Performance & accessibility
- Custom admin / CMS
Web apps
Booking, job listings, checkout, and dashboards, with the customer accounts and payment flows each product needs.
- Booking & scheduling
- Search & filtering
- Payments (Xendit)
- Auth & roles
Products & tooling
Restaurant tools for taking orders, recording payments, sending kitchen tickets, and managing cash shifts.
- Restaurant POS
- QR table & EDC flow
- Receipt / ESC-POS
- React terminal · C# agent
AI & systems
AI features for reading job flyers, building CVs, and connecting customer questions to booking tools, with validation and execution controls.
- AI agents (Anthropic)
- Event store / webhooks
- Provider-agnostic adapters
- Rate-limiting & obs
Brand & business, end-to-end
For F&B and beauty businesses, I work on the brand identity, space, and software together, from the initial concept to the website and operational tools.
- 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
- Expo
- Expo Router
- Node
- Next.js API
- Astro Endpoints
- Drizzle ORM
- Zod
- REST / Webhooks
- Web Push
- Turso (libSQL)
- SQLite
- PostgreSQL
- S3
- Vercel
- Upstash
- Sentry
- Xendit
- C# print agent
- Unity / URP
- ESC-POS
- TypeScript
- JavaScript
- C#
- C++
- SQL
- Anthropic API
- Context7
/05-By the numbers
Real figures only.
/06-About
I’m Alexanders. I design and build products, from the first concept through implementation.
I’m a full-stack and AI engineer based in Jakarta. I work with F&B and beauty brands on identity, websites, native apps, and the systems behind their day-to-day operations. I handle the work from product design through implementation, with attention to how customers and staff will use it.
/ 07 · Contact
Have a project in mind?
Tell me about your business and the website, app, or system you need. We can discuss the scope and how I can help.
Share the idea and what you need. I’ll reply myself.