KIERAN WILLIAMS

Senior Fullstack Software Engineer

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KW

Senior Fullstack Software Engineer

Kieran Williams

Senior developer building production web & mobile platforms used by 50,000+ people, and a multi-time ETHGlobal & Chainlink hackathon winner shipping across Web3, AI and DeFi.

  • 50k+active users served
  • 9hackathon prizes
  • FirstBSc Computer Science (86%)
Get in touch GitHub LinkedIn

Worked with

Person Centred Software Vindico Sero Cardiff University Tantrwm Ltd ETHGlobal

Experience

Person Centred Software

Senior Fullstack Software Engineer
Nov 2025 — Present
  • Migrated and stood up the full DevOps infrastructure, bringing it in-house from previous software contractors.
  • Redesigned the frontend's core functionality, rolling it out gradually behind Harness (Split.io) feature flags.
  • Upgraded the frontend from Vue 2 to Vue 3, modernising the codebase and its dependencies.
  • Carried out a full security audit of the system and fixed the vulnerabilities it found.
  • Introduced AI-first development workflows to speed up the team's delivery.
  • Developed features for the company's Flutter mobile applications.
  • Vue 3
  • Flutter
  • Dart
  • TypeScript
  • DevOps
  • CI/CD
  • Harness / Split.io
  • Feature Flags
  • Security
  • AI Workflows

Vindico

Lead Full Stack Developer
Aug 2023 — Nov 2025
  • Led a team of developers, architecting features and maintaining multiple production systems across mobile and web, serving over 50,000 active users.
  • Worked directly with clients and company directors on roadmap planning and feature scoping.
  • Built a learning management system supporting workshops, e-learning courses, policy compliance, statistical tracking and certifications.
  • Led the rebuild of a multifaceted entertainment application from Vue 2 to React.
  • Migrated over 20,000 users from a client's legacy system onto the new learning management platform.
  • React
  • Next.js
  • Node.js
  • TypeScript
  • Vue
  • Go
  • PostgreSQL
  • MongoDB
  • Redis
  • Capacitor
  • GCP
  • Firebase
  • AWS

Sero × Cardiff University

Software Developer / Researcher
Dec 2022 — Aug 2023
  • Designed and developed a Web3 marketplace connecting landlords with carbon-reduction service providers.
  • React
  • Next.js
  • Node.js
  • TypeScript
  • Hardhat
  • Solidity
  • IPFS
  • MongoDB
  • Mocha / Chai

CUROP — Cardiff University

Software Developer
May 2022 — Sep 2023
  • Developed the Cardiff University Smart City platform, giving the IoT department a centralised place to run experiments and manage data from many IoT devices.
  • Integrated with OpenRemote, in collaboration with Dr Charith Perera.
  • React
  • Docker
  • Node.js
  • TypeScript
  • Java
  • Gradle
  • Express
  • Puppeteer

Tantrwm Ltd.

Software Developer
Jan 2021 — Sep 2021
  • Built an end-to-end hardware and software solution for professional remote interviews used by the BBC, Channel 4 and university research groups.
  • React
  • Node.js
  • Electron
  • SCSS
  • Bash
  • AWS S3 / EC2
  • Linux
  • FFmpeg
  • Blackmagic HyperDeck API
  • PTZ API
  • RUT950 / VPN
  • BlinkStick LEDs
  • Jitsi

Recent Projects

Arbor trading interface

Arbor

Colosseum Breakout · Solana

May 2025

Streamlines complex arbitrage strategies for retail and institutional traders on Solana perps markets.

  • Multi-DEX execution and cross-protocol position offsets from a single interface
  • Composes parameterised strategies into a single transaction
  • Unified margin system with proactive liquidation alerts
  • Low-latency access across multiple perps protocols
  • React
  • Next.js
  • Tailwind
  • Solana
  • Anchor
  • Rust
  • TypeScript
Live demo GitHub Colosseum
Animal Kart Football match in a floodlit arena

Animal Kart Football

Multiplayer browser game

Oct 2026

An arcade football game where animals drive jetpack karts, playable in the browser on desktop, phone and tablet in 1v1, 2v2 and 6v6.

  • Authoritative Rust game server simulating at 120 Hz, with client-side prediction and reconnects
  • Physics, match rules and AI bots share one Rust codebase, compiled to WASM for offline play against AI
  • Online rooms with quick-join matchmaking, and AI drivers filling any empty seats
  • Three graphics presets, a 3D asset pipeline with per-model budgets, and touch and gamepad controls
  • Rust
  • WebAssembly
  • three.js
  • JavaScript
  • WebSockets
  • Vite
  • Docker
  • Railway
Play it
AutoPay Protocol landing page

AutoPay Protocol

ETHGlobal HackMoney · Protocol Labs

Feb 2026
  • ETHGlobal HackMoney 2026 — Finalist Winner
  • Protocol Labs — Flow Best Consumer DeFi

Non-custodial USDC subscription payments for people and AI agents. Funds stay in the payer's wallet until each charge, for a 2.5% fee.

  • On-chain spending policies with limits, intervals and adjustable lifetime caps
  • Settles on Base, Arbitrum, Flow EVM, Polkadot Hub and Tempo, with funding from 30+ chains via LiFi
  • Agent SDK, MCP server and HTTP 402 discovery so AI agents can subscribe and pay on their own
  • Relayer that collects payments when due, plus merchant SDK and middleware
  • Solidity
  • Foundry
  • TypeScript
  • React
  • Vite
  • Wagmi
  • Viem
  • LiFi
  • Supabase
  • MCP
Live site GitHub ETHGlobal
Densofi landing page

Densofi

ETHGlobal Taipei

Apr 2025
  • Flow Foundation — Best Consumer DeFi

Brings DNS records on-chain as liquid ERC-20 shares, unlocking price discovery, early liquidity and DeFi integrations for the $2B+ domain name industry.

  • Optimism
  • SuperchainERC20
  • Next.js
  • Wagmi
  • ENS
  • Foundry
  • OpenZeppelin
  • Worldcoin
Live demo ETHGlobal
Cryptopia Wallet

Cryptopia Wallet

ETHGlobal Agentic Ethereum

Feb 2025
  • Coinbase Developer Platform — Pool Prize
  • Crestal — Most Innovative Use of IntentKit

An all-in-one consumer AI agent wallet combining blockchain analytics, real-time market data and smart contract actions into a single command centre for your portfolio.

  • LangChain
  • TypeScript
  • Next.js
  • CDP AgentKit
  • IntentKit
  • The Graph
  • Base
  • FastAPI
GitHub ETHGlobal
Craft My Report

Craft My Report

SaaS utility

Dec 2024

Web app for quickly generating branded reports from CRM and ticketing exports, with Stripe billing built in.

  • Vue 3
  • TypeScript
  • Tailwind
  • Firebase
  • GCP
  • Puppeteer
  • Docker
  • Bun
craftmyreport.com
CryptoSpiinz NFT roulette

CryptoSpiinz

ETHGlobal Bangkok

Nov 2024

Turns NFT sales into a game: players contribute ETH to compete for NFTs, climbing contribution bands to boost their odds, while creators gain exposure and revenue.

  • Foundry
  • Solidity
  • Next.js
  • Dynamic
  • Chainlink VRF
  • Chainlink Price Feeds
GitHub
Shill meme launchpad

Shill

ETHGlobal Brussels

Jul 2024
  • Ethereum Foundation — Best Use of ZK Email

A meme-coin launchpad driven by a Twitter marketing flywheel and pre-mint campaign, rewarding shillers from the minted supply based on objective performance.

  • TypeScript
  • Next.js
  • Hardhat
  • Solidity
  • ZK Email
  • Twitter API
  • Redis
GitHub
PersonalStorage

PersonalStorage

ETHGlobal London

Mar 2024
  • Filecoin — Build Data Economies
  • Worldcoin — Pool Prize

Decentralised document storage on the FEVM that protects your identity, with an AI layer that lets you converse with your documents.

  • Filecoin FEVM
  • TypeScript
  • RAG
  • FastAPI
  • Lighthouse
  • World ID
GitHub
ElectricKeeper demo

ElectricKeeper

ETHDenver Virtual

Feb 2022
  • Chainlink — 1st Place
  • Space & New Frontier — Grand Prize

A Raspberry Pi electric grid controlled by a hybrid smart contract. Chainlink Keepers cut power when bills expire, and price feeds convert real NREL electricity rates to MATIC/USD on Polygon.

  • Raspberry Pi
  • TypeScript
  • Hardhat
  • Solidity
  • Chainlink
  • Polygon
Demo video GitHub

Education

Cardiff University

BSc Computer Science — First Class Honours (86%)
Sep 2021 — Aug 2023
  • Dissertation funded by Sero: a Web3 marketplace connecting landlords with providers of carbon-reduction interventions.
Read the dissertation