John Herbst

Next.js, TypeScript, React, Vercel, Vercel Blob · die-bestemming.vercel.app

• — Built with no database: all content is a single versioned JSON document in blob storage, which keeps running costs near zero for a small business.
• — Customers build a basket on their phone that becomes a pre-filled WhatsApp order with itemised prices and a total — no accounts, no payment gateway.
• — A phone-first Afrikaans admin lets the owners change the day's menu, car wash prices and opening hours themselves in under a minute; photos are resized in the browser before upload.
• — Ordering opens and closes on its own against South African time.

C#, .NET 10, ASP.NET Core MVC, EF Core · koolstoof.vercel.app

• — Categorised menu with live specials, a cart, and checkout by PayFast or cash on delivery.
• — Staff move each order across a four-stage board — Incoming, Received, Out for Delivery, Delivered — with payment state on every card and delivery split by suburb.
• — ASP.NET Core Identity for staff accounts, Entity Framework Core over SQL Server, containerised with Docker.

C#, .NET, WinForms

• — Configurable slip fields, company branding and named printer preferences, for a workflow no off-the-shelf tool matched.
• — Added truck registration enforcement and reworked the print flow in response to real daily use.
• — Covers print calibration, lookup list management, and backup and restore.

Next.js, TypeScript, Tailwind CSS, Supabase (Postgres), Vercel, PayFast · forever-note.vercel.app

• — Template-driven gift builder across eight occasion categories with tiered pricing.
• — PayFast integration with signature-verified webhook confirmation, an admin dashboard for fulfilment, buyer self-service editing and a moderated reviews system.
• — A print pipeline generates exact-spec CR80 card artwork per order — SVG composition, embedded QR codes and pre-shaped text outlines rasterised at 600 DPI, ready to hand to a printer.

Python, Flask, SQLite · spy-agency-app.onrender.com

• — Flask backend with a SQLite data layer and a login flow; my first project with a real backend, database and deployment pipeline.

Next.js, TypeScript, Tailwind CSS, Vercel Blob · portfolio-john-1cbd.vercel.app

• — Hand-rolled HS256 JWT session auth and scrypt password hashing on node crypto, with timing-safe comparison and no authentication dependency.
• — Authenticated admin over Vercel Blob: upload, rename, delete, named folders and manual ordering.
• — Project cards read their description and language breakdown live from the GitHub API, so pushing code updates the site.