Josh Day

Palydin

Construction finance and contract management, with an AI agent that works across the whole organisation.

• Progress claims, variations, extensions of time, retention, cost forecasting, cash flow and Xero cost sync for contractors and principals, on a 60-table Postgres schema.
• Production tool-calling agent: a router exposes tools by group, every write waits for human approval with a server-built preview, and document answers are grounded by retrieval over pgvector.
• Every data request, from the app or the AI agent, passes through one permission check, so each company on a contract sees only what it is allowed to. Automated tests block any release that bypasses it.
• Benchmarked an AI spreadsheet import against a deterministic parser on a real payment schedule (148/148 every run versus 139–148 for the model) and removed the AI path.
• Native e-signature approval chains with hashed snapshot PDFs, audit certificates and statutory deadline tracking.

FarmShare

Live two-sided marketplace for horse-friendly stays, agistment, trail rides and riding lessons across Australia.

organic search clicks in 12 months

122k

search impressions

7.2M

monthly search clicks, Nov 2025 to Sep 2026

4×

• Led development of the production platform: guest search and map, listing pages, checkout, messaging, reviews, a ten-step host onboarding flow, host dashboards and an internal admin console.
• Built the booking engine: instant and request-to-book flows with pay-and-hold, generated availability slots, pricing rules, cancellation policies and tested refund calculations.
• Integrated Stripe Connect for marketplace payments, with scheduled host payouts, webhook logging and a written payouts runbook.
• Two-way iCal sync so hosts keep their existing calendars, plus background jobs for payouts, request expiry, booking reminders and slot roll-forward.
• Grew organic search from about 3,400 to 14,000 clicks a month with a content hub and programmatic landing pages by state, region and event; ranks first for "farmshare agistment" and on page one for "horse agistment near me".
• Migrated authentication to Better Auth in production and hardened phone verification after a security review.

Self-custodial wallet startup

Mobile and web wallet for crypto and tokenized stocks, with managed stock baskets.

• Built the React Native app and Next.js web client over one shared core package; sign in with socials or email, and the system never holds keys (Turnkey with ZeroDev smart accounts).
• Built the monitoring backend for balances, token discovery and price alerts on Fastify, Postgres and BullMQ.
• Wrote the basket contracts: ERC-4626 vaults where a manager trades within per-asset weight caps and a daily loss budget, priced by Chainlink, with an oracle-free in-kind exit that always works.
• Contracts covered by unit, fuzz and ERC-4626 property tests in Foundry.

NOVR

Online booking for a Brisbane barber studio, built as a multi-tenant product other shops can use.

• Pure booking engine with no HTTP or database dependencies: roster resolution, availability, conflicts and booking lifecycle, fully unit tested.
• Rostering resolves four layers into bookable time: recurring templates with multi-week rotations, effective-dated changes, per-day overrides and leave.
• Customer booking pages and a staff admin over a thin multi-tenant Hono API.

Bitcoin rewards app startup

Mobile app for earning Bitcoin rewards and automated dollar-cost averaging.

• Built the iOS and Android app in React Native and Expo, with embedded wallets and sign-in through Privy.
• Worked with the client's team on the Express and Prisma API on Google Cloud Run, including push notifications.
• Contributed to the Next.js marketing site.

DeFi liquidity protocol

Automated, multi-range Uniswap V3 liquidity positions wrapped as a single token.

• Wrote the vault contracts: an ERC-20 share of a Uniswap V3 position that holds several ranges, compounds fees back in and can be rebalanced, plus a factory, zapper and liquidity-mining periphery.
• Fork-tested in Foundry against live chain state.
• Built the supporting stack: a Subsquid indexer, a GraphQL API server and the Next.js app with wagmi and viem.