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Csvhssj Ejjejene

@chyngyzbekasylbek

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Senior Android developer building reliable mobile systems for fintech and telecom.

Kazakhstan

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What I'm looking for

I’m looking to own Android architecture and reliability on production products in fintech/telecom—building scalable multi-module systems, integrating complex verification and connectivity features, and delivering fast, dependable releases with strong engineering standards.

I’m a Senior Android Developer with 5+ years of experience building and scaling production mobile applications across fintech, telecom, and startup environments. I design production-ready systems with strong focus on architecture, reliability, maintainability, and real-world performance, including large multi-module Android codebases.

At Alatau City Bank, I own core platform modules, improve build stability, and reduce inter-module coupling, while leading biometric SDK integration (Face Recognition / Luna) and an end-to-end video verification flow with robust state modeling, retries, and error handling. I also drove Jetpack Compose Design System adoption to standardize UI and reduce duplication; in a 0-to-1 startup (Unilink), I delivered eSIM/VPN onboarding/connectivity and in-app purchases/subscription logic and took the app through Google Play release and post-release support.

Experience

Work history, roles, and key accomplishments

Current

Senior Android Developer

Current

Alatau City Bank

Sep 2024 - Present (1 year 8 months)

Owned core platform modules in a large multi-module Android app, improving build stability and reducing inter-module coupling. Led biometric (Face Recognition/Luna) and end-to-end video verification flows with robust state management, retries, and error handling.

Kotlin Android SDK Jetpack Compose Clean Architecture Coroutines Flow Hilt Web Verification State Management

Senior Android Developer

O! Mobile Operator

Oct 2023 - Sep 2024 (11 months)

Delivered features for a high-load telecom super app, improving stability and user experience by addressing root-cause crash/ANR issues. Introduced Hilt dependency injection and standardized navigation contracts across modules while optimizing Gradle build configuration.

Kotlin Hilt Navigation Patterns Gradle CI CD Crash And ANR Troubleshooting Dependency Injection

Android Mentor

Geeks IT Courses

Dec 2022 - Sep 2024 (1 year 9 months)

Mentored junior developers to production-ready Android skills through code reviews and architecture/concurrency deep-dives. Translated complex topics like Coroutines, Flow, and Clean Architecture into practical implementation patterns.

Kotlin Code Review Clean Architecture Coroutines Flow Android Jetpack State Management Mentoring

Android Developer

OptimizTrade

Mar 2023 - Jun 2024 (1 year 3 months)

Built a POS Android app for retail sales and reporting, integrating barcode scanners and weighing devices over Bluetooth/BLE. Implemented resilient device connection and recovery logic and delivered daily/shift analytics features.

Kotlin POS Integration Connection Recovery Reporting & Analytics Real time Data Processing

Android Developer

Fishman Company

Jan 2021 - Mar 2022 (1 year 2 months)

Designed and implemented real-time Android messaging using WebSockets with low-latency delivery and consistent message handling. Managed WebSocket connection lifecycle with reconnects and state synchronization while addressing race conditions and offline/network edge cases.

Kotlin WebSockets Reconnection Logic

Android Intern

Sunrise Company

Sep 2020 - Jan 2021 (4 months)

Completed hands-on Android training and implemented UI screens and components with basic API integration and bug fixes. Practiced team workflows including Git flow, task tracking, reviews, and feature stabilization.

Kotlin XML Layouts Android Jetpack Local Storage API Integration Git Flow