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I will fix ios and android app bugs using swift or kotlin
Viktor Nesic
About this gig
iOS & Android Bug Fixing | Swift, Kotlin & KMP
Need an experienced developer to fix iOS or Android app bugs, crashes, or performance issues?
I'm a Senior Mobile Developer with 10+ years of experience in native iOS and Android development, mobile app debugging, bug fixing, and maintenance.
What I can fix:
- iOS app crashes, freezes, and startup failures
- Android app crashes, ANRs, and blank screens
- Swift, SwiftUI, UIKit, Kotlin, and Jetpack Compose bugs
- Kotlin Multiplatform (KMP) shared-code issues
- UI, navigation, lifecycle, and concurrency bugs
- Firebase, REST API, authentication, and push notification errors
- Memory leaks, slow performance, and background tasks
- Xcode, Android Studio, Gradle, and build errors
My debugging process:
- Analyze logs and reproduce the issue.
- Identify the root cause.
- Implement a clean, targeted fix.
- Test and verify the solution.
- Deliver source code and a technical summary.
Contact me before ordering to confirm the scope, complexity, and delivery time.
Reliable mobile app bug fixes backed by real production experience.
Get to know Viktor Nesic
Viktor Nesic
Senior Mobile Developer, iOS, Android, and Kotlin Multiplatform
- FromSerbia
- Member sinceMay 2016
Languages
English, Serbian, Croatian, Italian
I help businesses build reliable mobile apps, improve existing products, and solve complex technical challenges.
I'm a Senior Mobile Engineer with 10+ years in software development and experience across 20+ mobile apps, specializing in iOS (Swift, SwiftUI, UIKit), Android (Kotlin, Jetpack Compose), and Kotlin Multiplatform.
I work on native development, bug fixing, app maintenance, Firebase and API integrations, offline-first solutions, architecture reviews, and accessibility.
My focus is on practical solutions, maintainable code, and long-term product quality.
My Portfolio
Other Mobile App Development Services I Offer
FAQ
Can you fix bugs in existing iOS and Android apps?
Yes. I fix issues in existing native iOS apps built with Swift, SwiftUI, or UIKit, and Android apps using Kotlin, Java, or Jetpack Compose. I also support Kotlin Multiplatform projects.
What types of mobile app bugs can you fix?
I investigate crashes, startup failures, blank screens, navigation issues, API errors, Firebase problems, memory leaks, performance issues, build failures, and lifecycle-related bugs.
What do you need to start debugging my app?
Please provide a description of the issue, reproduction steps, relevant logs, device and OS details, and access to the source code. Screenshots or screen recordings are helpful.
Can you fix Kotlin Multiplatform (KMP) issues?
Yes. I work with Kotlin Multiplatform shared modules, business logic, networking, local persistence, native platform integrations, and Android/iOS interoperability. Copy answer
Will you explain the root cause and provide source code?
Yes. I deliver the relevant source code changes and a concise explanation of the root cause, the implemented fix, and the verification performed.
Can you guarantee a fix and delivery time ?
Not before reviewing the issue. Some bugs depend on third-party services, missing access, or complex system behavior. Please contact me before ordering so I can assess feasibility, scope, and delivery time.
