Hi 👋 I’m Agus Cahyono — Senior iOS Engineer (Remote)

I’m a Senior iOS Engineer with 5+ years of professional experience building, scaling, and maintaining production-grade iOS applications across fintech, health-tech, and consumer platforms.

I specialize in clean architecture, performance optimization, and long-term maintainability, with strong ownership from feature design → implementation → release → post-release improvements. I enjoy solving complex problems, improving legacy codebases, and delivering high-quality user experiences using Swift and SwiftUI.

I’m comfortable working in remote-first, async environments, collaborating with product managers, designers, backend engineers, and QA teams.

• 🌍 Based in Indonesia (GMT+7)
• 🌐 Open to Remote Full-time, Contract, or Freelance iOS roles
• ✉️ Contact: cahyo.mamen@gmail.com
• 🚀 Currently contributing to a large-scale Fintech iOS application
• 🧠 Interests: SwiftUI, iOS Architecture, On-device ML, Developer Content & Knowledge Sharing

💼 Professional Experience

I’ve worked on consumer-facing iOS applications used by thousands to millions of users, contributing to both greenfield development and legacy codebase modernization.

What I usually do

• Design and evolve scalable iOS architectures
• Build features with high product & business impact
• Refactor legacy code toward clean, testable, modular systems
• Improve performance, stability, and crash rates
• Collaborate asynchronously in cross-functional remote teams

👨‍💻 Previous Roles

• 📱 iOS Engineer @ Stockbit
• 👨‍💻 Senior iOS Developer @ RoomMe
• 👨‍💻 Senior iOS Developer @ SehatQ
• 📲 iOS Developer @ Hello Chat
• 📲 iOS Developer @ HiApp
• 🌐 iOS Developer @ Pasar Udang
• 🚀 iOS Developer & AVP Mobile Engineer @ DOT Indonesia

🧠 Core iOS Expertise

I focus on engineering fundamentals that scale in real-world products:

• Swift 5+, Objective-C, modern iOS APIs (iOS 16+)
• UIKit & SwiftUI (hybrid and full SwiftUI apps)
• Architectures: MVC, MVVM, VIP, VIPER, Clean Architecture
• Testing: Unit, UI, Snapshot & Integration tests (XCTest)
• Concurrency: async/await, GCD, Combine
• Networking & Data: REST APIs, JSON, offline-first patterns
• Code Quality: SOLID principles, modularization, refactoring

🛠️ Tech Stack & Tools

Mobile

• Swift, SwiftUI, UIKit
• XCTest, Xcode Instruments
• Fastlane, TestFlight

Workflow

• Git, Git Flow
• CI/CD pipelines
• Agile (Scrum & Kanban)

Supporting Tools

• Figma (collaboration with design)
• Firebase / Analytics tools
• RESTful backend integration

📌 Selected Focus Areas

These are areas I actively invest in improving:

• 📱 Migrating UIKit-based apps toward modern SwiftUI
• 🧪 Increasing test coverage in legacy projects
• ⚡ Improving app startup time & runtime performance
• 🧼 Reducing technical debt through incremental refactoring
• 🧠 Exploring on-device Machine Learning use cases

🌐 Community & Knowledge Sharing

I enjoy sharing what I learn through writing and discussions with the developer community.

• ✍️ Writing iOS & engineering articles on Medium
• 💬 Answering questions & learning on Stack Overflow
• 🎥 Creating developer content on YouTube
• 🤝 Open to mentorship, collaboration, and OSS discussions

📈 Impact Highlights

• 🚀 Improved app stability by reducing crash rates through systematic refactoring, safer concurrency patterns, and better error handling.
• ⚡ Optimized app performance by reducing launch time and runtime bottlenecks, leveraging Instruments and performance profiling.
• 🧼 Modernized legacy codebases by introducing clean architecture, modularization, and better separation of concerns, improving long-term maintainability.
• 📦 Led and contributed to migrating dependency management from CocoaPods to Swift Package Manager (SPM), simplifying project setup, reducing build issues, and improving CI reliability.
• 🧪 Increased code reliability by adding unit, UI, and integration tests, enabling safer refactoring and faster feature delivery.
• 🔄 Led or contributed to UIKit → SwiftUI migrations, improving developer velocity and UI consistency.
• 🤝 Collaborated in cross-functional remote teams, aligning technical decisions with product and business goals.
• 📲 Delivered multiple features from concept to App Store release, including post-release monitoring and iteration.
• 🧠 Mentored junior engineers through code reviews, architectural discussions, and best practices sharing.

🔗 Let’s Connect