I buildsystemsthat shouldn'texist yet.

Three surfaces from one build: a public marketing and signup site, each jewellery business's ERP, and a provider console with separate credentials. Tenants get their own schema, users, branches, stock, karigars, rates, invoices and audit trail; product name, pricing tiers and entitlements are configuration, not code.

Customers shop, sellers run their own catalogue, stock and orders, and platform staff oversee every business — three portals on one FastAPI backend whose boundaries are enforced in the API, not the browser. The backend was migrated from Express + Prisma to FastAPI + SQLAlchemy without changing the schema, URLs, JSON shapes or issued tokens.

An Express 5 + Prisma 7 API and a React 19 single-page app for the people who issue tickets every day. Support agents manage their own tickets; admins see users, expenses, the financial dashboard and broadcasts. Deployed on free tiers across Cloudflare, Render, Neon and Backblaze B2, with nightly encrypted backups.

A single-file, zero-dependency relational engine in Rust. Rows are never overwritten, so any query can be asked as of an earlier transaction, and append-only event streams share the write-ahead log and the commit with your tables.

A complete pipeline for Ash, a small typed language: lexer, parser, semantic analysis with rustc-style diagnostics, three-address IR and interpreter, a fixpoint optimizer, and x86-64 code generation for Linux and Windows with runtime traps and DWARF line info. Zero dependencies, about 2,600 lines of Rust.