Web3 frontend engineer with a decade in crypto — wallets, trading terminals and institutional interfaces across Bitcoin, Stacks, Solana and EVM chains.https://petewatters.ie/https://petewatters.ie/blog/portfolio-design-evolution/https://petewatters.ie/blog/portfolio-design-evolution/Three rebuilds of my personal site -- the tooling, the positioning, and the visual identity -- and the decision behind each one.Thu, 21 May 2026 00:00:00 GMThttps://petewatters.ie/blog/xapo-nextjs-verify-flow/https://petewatters.ie/blog/xapo-nextjs-verify-flow/How we orchestrated a conditional API fetch on the Express side, server-rendered the result into a Next.js 9 page, and avoided the loading flash on email-link landings — and why the same instinct points to Server Components today.Mon, 11 May 2026 00:00:00 GMThttps://petewatters.ie/blog/shipping-monster-prs/https://petewatters.ie/blog/shipping-monster-prs/Lessons from shipping massive pull requests on a crypto wallet — including a 5,783-addition PR that refactored collectibles across a monorepo.Tue, 09 Dec 2025 00:00:00 GMThttps://petewatters.ie/blog/sharing-features-extension-mobile/https://petewatters.ie/blog/sharing-features-extension-mobile/How we refactored Leather's activity feed into a platform-agnostic features package — sharing queries, types, and business logic across extension and mobile.Mon, 08 Dec 2025 00:00:00 GMThttps://petewatters.ie/blog/cross-platform-monorepo/https://petewatters.ie/blog/cross-platform-monorepo/My first monorepo, two rendering targets, one shared feature layerMon, 01 Dec 2025 00:00:00 GMThttps://petewatters.ie/blog/building-multi-protocol-collectibles/https://petewatters.ie/blog/building-multi-protocol-collectibles/Supporting Ordinal Inscriptions, SIP-9 NFTs, Bitcoin Stamps, and BNS Names in a single collectibles experienceSat, 15 Nov 2025 00:00:00 GMThttps://petewatters.ie/blog/expo-alternate-app-icons/https://petewatters.ie/blog/expo-alternate-app-icons/How we implemented 11 app icon options using expo-alternate-app-iconsFri, 01 Aug 2025 00:00:00 GMThttps://petewatters.ie/blog/expo-ota-updates/https://petewatters.ie/blog/expo-ota-updates/Balancing speed with security using EAS Update for a production crypto walletTue, 15 Jul 2025 00:00:00 GMThttps://petewatters.ie/blog/expo-multi-chain-architecture/https://petewatters.ie/blog/expo-multi-chain-architecture/Managing Bitcoin and Stacks in a unified interface with chain-specific balance, send, and receive flowsTue, 01 Jul 2025 00:00:00 GMThttps://petewatters.ie/blog/expo-secure-storage-biometrics/https://petewatters.ie/blog/expo-secure-storage-biometrics/How we protect seed phrases with expo-secure-store and expo-local-authenticationSun, 15 Jun 2025 00:00:00 GMThttps://petewatters.ie/blog/ios-deep-linking/https://petewatters.ie/blog/ios-deep-linking/Setting up Apple Universal Links for a React Native crypto wallet — associated domains, entitlements, and the apple-app-site-association file.Sun, 15 Jun 2025 00:00:00 GMThttps://petewatters.ie/blog/expo-cicd-fingerprinting/https://petewatters.ie/blog/expo-cicd-fingerprinting/Fingerprinting, EAS Workflows, and Maestro E2E tests for a production crypto walletSun, 01 Jun 2025 00:00:00 GMThttps://petewatters.ie/blog/branded-types-crypto-wallet/https://petewatters.ie/blog/branded-types-crypto-wallet/How adding a branded type for BTC addresses caught bugs at compile time and made the send flow safer in Leather's mobile wallet.Fri, 21 Feb 2025 00:00:00 GMThttps://petewatters.ie/blog/utxo-consolidation-six-lines/https://petewatters.ie/blog/utxo-consolidation-six-lines/Sometimes the best code is the code you delete. +6/-10 lines, merged same day.Mon, 20 Jan 2025 00:00:00 GMThttps://petewatters.ie/blog/shipping-mobile-app-from-scratch/https://petewatters.ie/blog/shipping-mobile-app-from-scratch/From zero React Native experience to App Store in 3 months, launching at BTC VegasSun, 15 Dec 2024 00:00:00 GMThttps://petewatters.ie/blog/flashlist-vs-flatlist/https://petewatters.ie/blog/flashlist-vs-flatlist/How switching from FlatList to FlashList cut dropped frames and improved scroll performance in Leather's React Native token list.Fri, 15 Nov 2024 00:00:00 GMThttps://petewatters.ie/blog/hide-balance-privacy-feature/https://petewatters.ie/blog/hide-balance-privacy-feature/A privacy feature that touches every balance display in the app — and why the implementation is simpler than you'd think.Tue, 24 Sep 2024 00:00:00 GMThttps://petewatters.ie/blog/cross-platform-ui-library/https://petewatters.ie/blog/cross-platform-ui-library/How we extended a web-first React UI library to support React Native, built components bottom-up, and shipped the first production mobile screen from shared packages.Wed, 18 Sep 2024 00:00:00 GMThttps://petewatters.ie/blog/extension-containers/https://petewatters.ie/blog/extension-containers/How Leather's browser extension went from a global container system to composable page-level headers — across 468 files and two major refactors.Mon, 19 Aug 2024 00:00:00 GMThttps://petewatters.ie/blog/spam-token-filtering/https://petewatters.ie/blog/spam-token-filtering/How we built and evolved a spam filter for token names, symbols and transactions in Leather — from a URL regex to a generic sanitiser across the whole UI.Tue, 02 Jul 2024 00:00:00 GMThttps://petewatters.ie/blog/building-installable-ui-library/https://petewatters.ie/blog/building-installable-ui-library/How I extracted 20+ React components from a crypto wallet browser extension into a published, versioned UI library — and then integrated it back.Thu, 20 Jun 2024 00:00:00 GMThttps://petewatters.ie/blog/panda-css-preset/https://petewatters.ie/blog/panda-css-preset/How I extracted a wallet extension's theme configuration into a reusable Panda CSS preset package — consolidating tokens, recipes, and semantic styles into a single installable dependency.Wed, 29 May 2024 00:00:00 GMThttps://petewatters.ie/blog/ledger-nonwitness-utxo/https://petewatters.ie/blog/ledger-nonwitness-utxo/A small but critical fix for hardware wallet users — ensuring nonWitnessUtxo transactions display the right amount before signing.Tue, 14 May 2024 00:00:00 GMThttps://petewatters.ie/blog/design-system-migration/https://petewatters.ie/blog/design-system-migration/Incrementally removing a design system across 500+ files in a production crypto walletWed, 15 Nov 2023 00:00:00 GMThttps://petewatters.ie/blog/designing-a-monorepo/https://petewatters.ie/blog/designing-a-monorepo/How I set up and designed the monorepo architecture for Leather wallet — consolidating a browser extension, mobile app, and shared packages into a single repository with automated publishing.Thu, 02 Nov 2023 00:00:00 GMThttps://petewatters.ie/blog/modal-routing-browser-extension/https://petewatters.ie/blog/modal-routing-browser-extension/How I refactored overlay modal routing in a browser extension to properly handle background content, direct navigation, and nested route state.Mon, 16 Oct 2023 00:00:00 GMThttps://petewatters.ie/blog/mnemonic-validation/https://petewatters.ie/blog/mnemonic-validation/Adding real-time word validation to a 12/24-word seed phrase input — consolidating BIP39 libraries and catching typos before they cost someone their wallet.Fri, 13 Oct 2023 00:00:00 GMThttps://petewatters.ie/blog/colour-token-migration/https://petewatters.ie/blog/colour-token-migration/How we renamed an entire design token vocabulary during Leather's rebrand — and why semantic naming matters more than you think.Thu, 15 Jun 2023 00:00:00 GMThttps://petewatters.ie/blog/human-readable-ethereum-transactions/https://petewatters.ie/blog/human-readable-ethereum-transactions/Raw blockchain transactions are incomprehensible to most users. Here's how you decode them into something meaningful — and why it matters for crypto UX.Sat, 15 Apr 2023 00:00:00 GMThttps://petewatters.ie/blog/cryptowatch-coderunner-trading-automation/https://petewatters.ie/blog/cryptowatch-coderunner-trading-automation/Taking over a prototype and shipping an MVP for custom Python trading scripts at Kraken's CryptowatchThu, 10 Mar 2022 00:00:00 GMThttps://petewatters.ie/blog/cryptowatch-cockpit-portfolio-table/https://petewatters.ie/blog/cryptowatch-cockpit-portfolio-table/Creating a real-time portfolio management table and trading UI components for Kraken's Cryptowatch platformTue, 15 Jun 2021 00:00:00 GMThttps://petewatters.ie/blog/javascript-framework-analysis-fidelity/https://petewatters.ie/blog/javascript-framework-analysis-fidelity/A look back at evaluating Ember.js vs Backbone/Marionette for enterprise financial applications — and what it taught me about making technology decisions that stick.Sat, 01 Nov 2014 00:00:00 GMThttps://petewatters.ie/blog/first-web-application-telco-monitoring/https://petewatters.ie/blog/first-web-application-telco-monitoring/Before React, before frameworks, before crypto — I built an internal monitoring tool at The Now Factory using Java, jQuery, HighCharts, and the Google Visualisation API.Fri, 01 Jun 2012 00:00:00 GMThttps://petewatters.ie/blog/masters-thesis-academic-performance-visualisation/https://petewatters.ie/blog/masters-thesis-academic-performance-visualisation/Highlights from my MEng thesis at DCU — a Java web application that used HighCharts, the Google Visualisation API, and linear regression to analyse student academic data.Wed, 01 Sep 2010 00:00:00 GMT