Architecture & maintainability
Swift, SwiftUI, UIKit, MVVM/MVVM-C, Core Data, REST APIs, modular flows, and code that remains understandable after release.
Open to iOS roles in Japan / remote
iOS Developer building reliable, polished mobile products.
I’m Ramkumar Vellaisamy, an iOS developer currently based in Japan, with 7+ years of experience across enterprise apps, fintech, and independent App Store products. I specialize in Swift, SwiftUI, UIKit, Core Data, performance, and shipping production-ready user experiences.
- Experience
- 7+ yrs
- Published
- 15+ apps
- Location
- Japan
What I bring to a team
- Production iOS delivery from architecture to App Store release
- Strong SwiftUI/UIKit implementation with clean UX details
- Ownership mindset from enterprise codebases and indie products
Professional profile
A mobile engineer who can build, stabilize, and ship.
Hiring teams usually need more than “Swift knowledge.” I bring production judgment: readable architecture, reliable persistence, pragmatic debugging, performance profiling, clean handoff with product/design, and the discipline to get apps approved and maintained.
Performance & reliability
Experience improving launch/load behavior, offline-first flows, caching, bug fixing, crash-prone areas, and UX consistency in production apps.
Product shipping
App Store publishing, analytics, subscriptions, Firebase, RevenueCat, Product Hunt launches, ASO, and post-release iteration.
Selected App Store work
Products that show end-to-end ownership.
These projects demonstrate product thinking, UX polish, integrations, persistence, and real release experience — useful signals for hiring teams.
App Store profile
Play Store profile
Smart Receipts
View site
Ring Sizer
View site
Places Been
View in App Store
Tally Counter
View in App Store
Habit Breaker
View in App Store
Schengen Calculator
Celibacy Tracker
View siteExperience
Relevant iOS work history.
A mix of enterprise engineering, contract delivery, and end-to-end indie product ownership.
Indie iOS Developer
Self-employed · App Store portfolio- Designed, built, and published multiple App Store products, including receipt scanning, ring sizing, travel tracking, habit tracking, and counting utilities.
- Implemented SwiftUI product flows, Core Data persistence, widgets, localization, haptics, subscriptions, Firebase, RevenueCat, and AI-assisted features.
- Handled product positioning, App Store metadata, landing pages, Product Hunt launches, and post-launch improvements.
iOS Developer, Contract
SmartCash PSB — Airtel Africa- Enhanced a fintech retail app by fixing critical bugs, improving UI flows, and refactoring legacy implementation areas.
- Collaborated with product and design stakeholders to deliver production-ready updates with stronger code quality and rollout confidence.
iOS Developer
Zoho Corporation- Worked on B2B/B2C finance mobile apps with a focus on reliability, maintainability, and user-facing performance.
- Built offline-first flows using Core Data and custom URL caching to reduce repeated network waits and improve app responsiveness.
Technical strengths
Skills mapped to real iOS delivery.
A concise view of the technologies and practices I can bring into a professional engineering team.
iOS engineering
SwiftSwiftUIUIKitCombineCore DataGCDSPM
Architecture & quality
MVVM-CREST APIsUnit testsUI testsCode reviewInstruments
Product integrations
FirebaseRevenueCatPush notificationsWidgetsKeychainMaps/GPS
Workflow
GitGitLab CI/CDBitbucketFigmaASOKotlin KMP basics
Contact
Looking for a dependable iOS developer?
I’m open to roles where I can contribute to Swift/SwiftUI apps, improve product quality, and ship features that users rely on.