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Timothy Yu
Senior iOS Engineer
Taiwan · +886 929070110 · timyeou1234@hotmail.com · GitHub · LinkedIn
Summary
Senior iOS Engineer with 10+ years delivering self-custodial wallets, real-time betting products, and connected vehicle applications.
Experienced in owning features from product and API discussions through implementation and production support.
Technical Skills
Languages: Swift, TypeScript
Frameworks: UIKit, SwiftUI, RxSwift, Combine
React Native: TypeScript, Fabric, TurboModules
Architecture: MVVM
Concurrency: Swift Concurrency
Networking: REST APIs, WebSocket
Blockchain: EOA & Smart Contract Wallets, Transaction Signing, Wallet SDK Integration, Staking & Vault Integrations
Tools: Xcode, Git, GitHub Actions
AI-Assisted Engineering
- At Crypto.com, used AI tooling to review open Jira work, decompose features into subtasks under the relevant Epic, and turn ticket and Figma context into architecture notes when needed.
- Used AI for codebase exploration, implementation support, refactoring, debugging, and edge-case discovery, followed by manual validation of UI/UX, parameters, network behavior, failure states, and edge cases.
- Used AI to prepare commits and pull requests, then reviewed changes personally and with GitHub Copilot and Claude. Evaluated every review comment manually, replied with the decision and reasoning, resolved all discussions, and requested code-owner approval before merge and the weekly CI release.
Selected Side Projects
Moment OS — AI-Assisted Planning Product (In Development)
- Using AI-assisted development to build an iOS-first React Native, Expo, and TypeScript application that turns natural-language intentions into editable preparation plans.
- Keeps AI suggestions separate from saved application data so user-approved plans remain recoverable and the interface distinguishes confirmed results from unverified suggestions.
- Created tools for reliable long-running agent work: Context Handoff preserves acceptance criteria across fresh threads, Task ETA Tracker forecasts from observable milestones, and Moment Monitor provides read-only live status.
- Uses Codex skills, lifecycle hooks, explicit approval boundaries, verification, progress visibility, and recovery paths to keep agent work reviewable and reliable.
ProductDev — AI-Assisted Automation Workbench (In Development)
- Using AI-assisted development to build a local-first macOS workbench that observes repository automation through native Monitor, Runs, health, and recovery views.
- Keeps GitHub Issues and the existing scheduler authoritative while guarded actions, exact dry-runs, and permanent receipts make automation reviewable and recoverable.
Professional Experience
Crypto.com
Senior iOS Developer
Sep 2024 – Jul 2026
- Owned iOS development for the Earn module, including feature delivery, maintenance, and refactoring across multiple blockchain protocols.
- Delivered Buy & Swap by extending the existing fiat purchase journey with a user-initiated on-chain swap after the purchased asset reached the wallet.
- Built and maintained staking flows across major EVM-compatible protocols, covering staking, unstaking, reward claiming, and position management.
- Worked with Product Managers and Backend Engineers throughout feature planning, API discussions, implementation, and production delivery for a self-custodial wallet serving approximately 20K daily active users.
Cronos App
- Worked exclusively in React Native and TypeScript during the Cronos App phase, building the Earn tab with Fabric and TurboModules in the New Architecture.
- Implemented smart contract wallet features, including transaction signing and UserOperation construction.
- Built Morpho vault flows for deposits, withdrawals, and position tracking.
- Worked with Backend Engineers on API discussions and multi-step blockchain transaction flows, and validated vault features on Cronos Testnet with mocked Morpho vaults.
San Orange Technology
Senior iOS Developer (Contract)
Jun 2024 – Aug 2024
Client: KINTO
- Delivered production iOS features for KINTO’s connected vehicle application during a three-month contract.
- Implemented vehicle usage tracking, vehicle status, and in-app guidance features while collaborating with Product, Design, and Backend teams on a short delivery cycle.
OpenNet
Senior iOS Developer
Oct 2020 – Apr 2024
Product: SportyBet
- Built real-time betting features for SportyBet, a sports betting platform serving approximately 100K daily active users.
- Implemented WebSocket synchronization for live odds, open bets, and betting history, and improved subscription management to prevent duplicated updates across multiple betting slips.
- Adapted Android-first product requirements into native iOS flows instead of directly copying the Android implementation.
- Migrated legacy modules to RxSwift and MVVM to improve maintainability and support ongoing feature development.
- Built an internal mock server for UI development and automated testing, reviewed pull requests, and mentored junior iOS engineers.
Royal Technology
Project Manager / iOS Developer
Apr 2019 – Aug 2020
- Served as the primary iOS developer while managing client projects from planning through App Store release.
- Delivered production iOS applications and coordinated Product, Backend, and Android development across project teams.
Awesome Limited
iOS Developer
Apr 2018 – Jan 2019
- Developed video streaming applications for the China market, including encrypted HLS (m3u8) playlist playback.
iOS Developer
Aug 2017 – Apr 2018
- Led a three-engineer iOS team responsible for enterprise applications, internal distribution, and release coordination.
WeWork Technology
iOS Developer
Jan 2017 – Jul 2017
- Independently delivered iOS applications involving barcode and QR-code scanning, vehicle rental services, Bluetooth accessories, and media playback.
IdeaBus Technology
iOS Developer
Aug 2016 – Jan 2017
- Independently built logistics tracking and packaging-monitoring applications using Swift and SOAP APIs.
Education
National Taipei University
Bachelor of Business Administration
Last updated from commit c3cdd55e161bfe523310ea94f1dc7e7cc49edbc9.