Studio notes · Vol. 02 · MMXXVI
Quezon City · Full-stack at Zkript
In production · Cavalry, EVX, Koobo
Production is many independent lines, held in tune.
Khim S. Rata writes TypeScript across React Native, Next.js, NestJS, and Express — then stays with it when a defect shows up in a live environment. At Zkript the desk is Cavalry and Hello Again: real-time systems, schema migrations, and releases that have to land.
01
Three production pieces from the Zkript desk. Energy-company web apps, an EV charging client, and a travel marketplace that had to stop racing itself.
An Australian engineering firm. The apps have to authenticate the same person across more than one company hall.
Maintain and enhance production web applications for Cavalry, including deployments that serve end clients Santos and Arrow Energy. Configure those environments with Docker, and keep the OpenID Connect single sign-on that ties the suite together.
A driver should add a car from a plate, pay for a session, and be the person the app thinks they are.
On the Hello Again EVX Expo app: driver authentication, the Stripe payment path for charging sessions, and licence-plate lookup so a vehicle can be added from plate details. TypeScript through React Native, NestJS, Prisma, and TanStack Query.
Two requests at the same second should not invent two different bookings.
Diagnosed a race in the payment and reservation flow that left booking state inconsistent under concurrent requests. Then re-architected Socket.IO notifications: messages used to fire only inside a chat room, so per-user rooms now reach a recipient anywhere in the app. Defects across a Next.js and NestJS Turborepo on MongoDB.
02
The registers from the desk. Hover a node to see where it sits — interface, systems, persistence, or the last mile.
Select a register, or rest on a node.
03
A short log. The desk at Zkript opened in November 2025, on systems that were already live.
Hired in November 2025 as a full-stack developer. Still there. Maintain and enhance production applications for Cavalry and Hello Again (EVX). TypeScript across React Native (Expo), Next.js, NestJS, and Express.
Production defects, versioned schema migrations on PostgreSQL, MySQL, and MongoDB, and releases onto Microsoft Azure and Docker. The work is the suite after launch, not the slide before it.
04
If the problem is already in production — a race, a login, a payment that must not double-book — send a short brief.
“Diagnose the defect. Keep the realtime honest. Land the release.”
