Hayden Griffin

• Smart Escrowsmart-escrow.euEscrow for law firms handling property and other high-value deals.

  Covers onboarding and KYC for each party, e-signing, and holding funds until the release conditions are met. I designed it and wrote most of it.

  

  TanStack Start, Hono, Cloudflare Workers, Postgres, Drizzle

  smart-escrow.eu

• UniPocketunipocket.storeA store for mobile top-ups, e-money vouchers and gaming cards in Cyprus.

  Customers pay by card and keep what they buy in their Pocket until they need it. Behind it is an admin portal for products, orders, support and reconciliation. I built it on the white-label platform below.

  

  TanStack Start, Hono, SQL Server, Kysely, Better Auth

  unipocket.store

• Payments APILets partners use a licensed banking provider without integrating with it directly.

  Mutual TLS to the bank, KYC onboarding, idempotent requests and webhook forwarding.

  Node, Hono, Kysely, Postgres

• White-label platformA starting point for new financial products, rebranded from one config file.

  Web apps for businesses and admins, an Expo mobile app and a typed API. So far it has been used for UniPocket, an event ticketing platform and a loyalty wallet.

  TanStack, Hono, Drizzle, Expo

• Group websitespaymidas.euMarketing sites for the PayMidas group, from one monorepo with a shared CMS.

  

  Astro, Sanity, Cloudflare

  paymidas.euivorylion.eu

• Legacy rebuildsUpdating partners' older payment apps without replacing their backends.

  An e-money portal restyled and made accessible in place, and a Cordova app rebuilt in Expo against the same gateway.

Most of this code is private. Happy to walk through it.

• PayMidas2026 – nowCTO
• Jumptech2021 – 2026Senior Software Engineer · Software Engineer until 2024

  • Built an AI image-analysis pipeline: a YOLO classifier on SageMaker and LangGraph agents on ECS.
  • Built an MCP server for the Jumptech API and got the team using Claude Code.
  • Owned the grid-connection integration for EV chargers, solar, batteries and heat pumps.
  • Cut new-customer setup from hours to minutes with a workflow-cloning pipeline.
  • Built document packs with automatically generated electrical certificates.
  • Led a zero-downtime DynamoDB migration and mentored a junior engineer.

  jumptech.eco

• IRMACOS2020 – 2021Full Stack Engineer · Self-employed

  • IoT platform: Java services configuring ESP32 devices over MQTT, Kafka between services, and a Node and Postgres API with a React admin app.
• Ratio2019 – 2020Graduate Software Engineer

  • An access-control service in Go on Lambda and DynamoDB, plus Node and Go APIs for internal reporting.

  ratio.co.uk

• Fivium2017 – 2018Trainee Applications Developer · Placement year
• University of Surrey2015 – 2019BSc Computer Science, First Class

This is my hobby. I run a small homelab with Home Assistant, and I build integrations, apps and local AI tools that solve everyday problems around the house. The projects below are open source. If one is useful to you, you can buy me a coffee.

For TVs and consoles

Afterglow

LG webOSv1.5.6PS5v1.6.0

A Music Assistant player for LG TVs and the PS5: the artwork, word-by-word lyrics and the queue from the remote or a DualSense, with MilkDrop visuals drawn in time with the music.

How it worksLG webOS on GitHubPS5 on GitHubLive demo

PRISM

Android TVv1.0.0

One remote for an Android TV box and an LG TV: while an LG app is on screen, the Shield's remote drives the TV, with a launcher for LG apps and quick TV settings, through Home Assistant.

How it worksGitHub

House for webOS

LG webOSv1.2.0

A Home Assistant panel for my LG TV, made for the remote, with a weekly recap of the house: steps, dinners, energy and who used the most hot water.

How it worksGitHubLive demo

For the home

Lamplight

Home Assistantv1.2.0

A design system for Home Assistant wall tablets, and six cards built on it, from weather to timers. Its core is a small ES module other cards can build on.

How it worksGitHubLive demo

Food Diary

Home Assistant · iPhonev1.6.1

A calorie and macro diary that runs in Home Assistant, with a native SwiftUI iPhone app, Apple Health sync, and planned meals that go straight into the diary.

How it worksGitHub

Mira Mode

Home Assistantv0.2.0

A Home Assistant integration that controls a Mira Mode digital shower over Bluetooth LE, and counts the water and energy each shower uses.

How it worksGitHub

Also running at home: local voice control (speech recognition and text-to-speech on my own server, with wall tablets as the microphones) and an LLM agent that can read and control the house (every action it proposes is checked before it runs).