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.
Experience
- 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%.
- Continued building and supporting my own App Store products, iterating on features and performance across live iOS / iPadOS apps.
- 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.
- 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.
- 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.
- 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.
- Developed B2B iOS projects and maintained PHP backend systems alongside university studies.
Toolbox
Apps & Projects
Wordfinity
A competitive multiplayer Word Game built fully in SwiftUI with a Firebase backend for realtime events.
SwiftUI • Firebase App Store
bubl
A workout app focusing on wellbeing with a custom check-in system and in-house workout content.
UIKit/SwiftUI • Custom Backend App Store
Capturino
A specialized iPadOS tool that turns your iPad into a monitor using an HDMI capture card.
UIKit/SwiftUI • Metal App Store
SongReveal
A multiplayer song guessing webapp game with a twist. Players guess songs while clues are randomly revealed.
Web • Multiplayer • Real-time Visit Site
Anvil
An agentic tool built for open LLMs with a frontier user experience — streaming chat, live thinking, gated tool approvals, inline diffs and a built-in browser. This site was built using this.
Open Source • TypeScript • Electron GitHubGet in Touch
Feel free to reach out for collaborations, opportunities, or just a chat about iOS development.