Dillon Hoa

Lead / Senior iOS Engineer · Mobile Tech Lead

Dillon Hoa

Lead iOS engineer with 10+ years building and shipping mobile products across health-tech, fitness, sports and SaaS. I take apps from whiteboard to App Store, define clean and scalable architecture, and lead small mobile teams to deliver. Currently a Senior iOS Engineer at EA on the EA Sports App — serving millions of monthly users at 99.9%+ crash-free — and an independent developer shipping my own App Store products.

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0+ Years Shipping
0+ Apps Shipped
0.9% Crash-Free
0M+ Monthly Users

Experience

Electronic Arts (EA) — EA Sports App Feb 2026 — Present
Software Engineer III / Senior iOS Developer
  • Rewrote the authentication layer, cutting cold-start load times from ~8s to ~0.8s and lifting the share of users reaching the initial screens from ~40% to ~85%.
  • Introduced an architecture suited to the app's realtime-event needs across a large, inherited codebase — reducing network requests by over 50% while improving maintainability.
  • Consistently delivered high-priority features against tight deadlines and in-flux designs, driving close communication to ship work that genuinely matters.
  • Contributing to a product serving millions of monthly active users at a crash-free rate above 99.9%.
Self-employed — Remote Sep 2025 — Feb 2026
Independent iOS Developer
  • Continued building and supporting my own App Store products, iterating on features and performance across live iOS / iPadOS apps.
Ieso Health — Remote Apr 2022 — Sep 2025
Lead iOS Developer / Mobile & Tech Lead
  • Built and maintained the core iOS app from inception to a Medical Device Class 1–approved product, working within NHS guidelines.
  • Led a mobile team of 4 and drove system architecture decisions as part of the tech-lead group.
  • Partnered with AI research scientists and engineers to bring ML models into the platform and app.
  • Designed custom BotFramework integrations delivering unique native experiences.
  • Championed context-free APIs and clean architecture across the codebase.
Low6 — Solihull Oct 2020 — Apr 2022
Lead iOS Developer / Mobile Tech Lead
  • Overhauled legacy apps, re-architecting them to modern coding patterns during a high-growth period.
  • Built the Low6 SDK for internal and external developers and acted as solution architect for core, scalable components.
  • Launched and maintained a broad portfolio of apps; managed the mobile team (incl. Android) and led Scrum ceremonies.
  • Coordinated backend developers to produce clean, agnostic APIs.
Gymshark — Training & Ecommerce Apps Jul 2019 — Oct 2020
Senior iOS Developer
  • Owned key features in the Training App and kick-started a new Ecommerce app with a fresh team.
  • Implemented automated CI/CD delivery pipelines (Bitrise).
  • Mentored junior developers and presented on development practices.
sales-i — Solihull Sep 2012 — Jul 2019
iOS Developer / Software Architect
  • Built and maintained the company's iOS, Apple Watch and Apple TV apps — native clients to the sales-i SaaS platform.
  • Led mobile design, translating web paradigms into mobile, and owned App Store release processes.
  • Managed mobile sprints and app-to-backend integration.
Advance IT Group 2006 — 2012
Web & iOS Developer (part-time)
  • Developed B2B iOS projects and maintained PHP backend systems alongside university studies.

Toolbox

Swift SwiftUI UIKit Combine Core Data Architecture CI/CD Firebase On-device ML XCTest Async/Await SDK Design Team Leadership App Store

Apps & Projects

Wordfinity

Wordfinity

A competitive multiplayer Word Game built fully in SwiftUI with a Firebase backend for realtime events.

SwiftUI • Firebase bubl

bubl

A workout app focusing on wellbeing with a custom check-in system and in-house workout content.

UIKit • Custom Backend Capturino

Capturino

A specialized iPadOS tool that turns your iPad into a monitor using an HDMI capture card.

iPadOS • UIKit

Get in Touch

Feel free to reach out for collaborations, opportunities, or just a chat about iOS development.