Based
Gold Coast, QLD
Local time
AEST
Index
05 projects, 5 live

Keita Emsden

Gold Coast builder who makes stuff on the internet. Some of it's useful. All of it lives here.

See the Work Read the Writing

Built & Shipped

05 projects

  1. Kold Brew concentrate calculator: 250 g of coffee at 1 to 4 needs 1 litre of water, drawn to scale

    Kold Brew (opens in a new tab)

    Cold brew recipe & calculator

    Stack
    React, Vite, PWA
    Type
    Personal
    Status
    Live
  2. Koach tactics board: a 4-3-3 against a 4-4-2 with run, pass and press arrows and coaching notes

    Koach (opens in a new tab)

    Coaching tactics board

    Stack
    React, TypeScript, Zustand
    Type
    Personal
    Status
    Live
  3. Big Decisions worked example: three job offers scored against five weighted criteria, Fieldnote ahead on 7.53

    Big Decisions (opens in a new tab)

    Weighted-criteria decision scorer

    Stack
    React, TypeScript, Tailwind CSS
    Type
    Personal
    Status
    Live
  4. Kaddie sign-in page: Know what you hit from here, with the log, book and ladder explained

    Kaddie (opens in a new tab)

    Range session yardage tracker

    Stack
    React, Vite, Fastify, Postgres
    Type
    Personal
    Status
    Live
  5. ProperChels match-day dashboard: next fixture, league table after gameweek 5 and recent Chelsea results

    ProperChels (opens in a new tab)

    Chelsea FC match-day dashboard

    Stack
    Next.js, TypeScript, Gemini
    Type
    Personal
    Status
    Live

Things I Wrote

  1. The AI BuilderCompanies are going to need people who can build AI systems from scratch.
  2. Automating my Football ScheduleI automated my 5-a-side football schedule into Google Calendar using Google Apps Script, scraping an ASP.NET site, handling ViewState encoding, and sharing it with teammates for free.
  3. Problem Solving with AIA reflection on why I keep building: the puzzles, the failures, the learning loop, and why AI makes this era especially exciting for curious creators.

View all writing

What I'm Up To

The stuff that doesn't fit in a project card but probably explains why I built half of them.

Into right now

Golf, obsessively

Tracking every round, obsessing over launch angles, and building Kaddie partly to justify the obsession.

Chelsea FC

Supporting Chelsea through thick, thin, and whatever the current season qualifies as. Built ProperChels so I could suffer more efficiently.

Cold brew season, always

Built a calculator to nail the ratios. Gold Coast weather demands it year-round.

Lately shipped

  • KaddieLive
  • ProperChelsLive

Learn Lab

Short modules on AI basics, prompt engineering, and how to actually use these tools without losing your mind.

A practical place to learn the stuff that actually helps: how to brief models clearly, how to turn vague ideas into useful plans, and how to orchestrate workflows without relying entirely on vibes.

  1. 01

    AI Basics

    What AI is, what language models are actually doing, and why confidence is not the same thing as correctness.

    12 min, Beginner
  2. 02

    Prompt Engineering

    How to get better outputs by being clearer about the goal, context, constraints, and format.

    14 min, Beginner
  3. 03

    Planning With AI

    How to turn a vague brief into a scoped, testable plan that an AI model can actually help execute.

    13 min, Beginner
  4. 04

    .md Orchestration

    How markdown instruction files help coordinate agents, humans, constraints, and handoffs in a build workflow.

    15 min, Beginner

Say Hello.

Got a project idea, a question, or just want to talk golf? I'm usually pretty good at replying.

Keita replies same day