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# Senior Mobile Developer (Android + iOS) Remote

- **Company:** GSTEX LLC
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Salary:** $18,000 - $36,000
- **Contract:** Permanent contract
- **Skills:** Flutter, Clean Code Principles, Java (Programming Language), Amazon Web Services, Amazon Cloudfront, Amazon S3, Data Analysis, Apple IOS, App Store (IOS), Mobile Application Development, Software Debugging, Monitoring of Systems, Push Technology, Mobile Application Software, Performance Tuning, Load Balancing, Swiftui, Backend, Kotlin, Amazon Relational Database Service, React Native, Google Play
- **Published:** October 17, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=8161438a92187ffe

## About the Role

* 4+ years of professional mobile development experience
 * Strong hands-on experience with both Android (Kotlin/Java) and iOS (Swift/SwiftUI) - OR strong

experience with a cross-platform framework (Flutter or React Native) plus the ability to work on native

modules when needed

 * Proven experience maintaining and extending existing production apps (not only green-field

projects)

 * Solid experience with debugging, crash analysis, and performance optimization
 * Experience working with AWS services (ECS, RDS, S3, CloudFront, Secrets Manager, or similar)
 * Familiarity with CI/CD pipelines and app store submission processes
 * Good written and spoken English
 * Ability to work independently with minimal supervision

Nice-to-Have

 * Experience taking over projects from external vendors or previous teams
 * Knowledge of backend technologies or API integration
 * Experience with push notifications, analytics, and monitoring tools
 * Located in Vietnam or in a time zone that overlaps well with Vietnam (UTC+7)

## Description

We are looking for an experienced Mobile Developer to take ownership of an existing mobile application

after handover from our current development partner.

Your main responsibilities will be maintaining the app in production, fixing bugs, improving stability and

performance, and developing new features. You will work closely with the current Vietnam-based

development team during a knowledge-transfer period and then become the primary technical owner of

the application.

This is an excellent opportunity for a developer who enjoys taking over existing codebases, solving real

production issues, and building long-term ownership of a product.

Key Responsibilities

 * Take full ownership of the mobile application after vendor handover
 * Troubleshoot, diagnose, and fix bugs in production (Android & iOS)
 * Develop and implement new features based on business requirements
 * Maintain and improve app performance, stability, and user experience
 * Work with the existing AWS backend (ECS, RDS, S3, CloudFront, Load Balancing, etc.)
 * Collaborate with the current development team during the knowledge-transfer / overlap period
 * Manage app store releases (Google Play and Apple App Store)
 * Write clean, maintainable code and keep technical documentation updated
 * Communicate progress clearly with non-technical stakeholders