11/03/2026 updated
100 % available
Senior Android Developer
Plovdiv, Bulgaria
Only remote
Bachelor of Computer Systems and Technologies, Technical University (2013 - 2017)About me
Senior Android developer, 12 years, products across fintech, healthcare and secure communications. I own the architecture and stack decisions, review and mentor the team, and deal with clients and hardware manufacturers — and I'm at my best turning an unstable codebase into one that ships reliably.
Android (Software)Android Software DevelopmentAndroid StudioAndroid Debug BridgeGoogle FirebaseKotlinRestful ApiAndroid Ui
Kotlin & Java Development
Expertise in Kotlin and Java as primary programming languages for Android development, with 11+ years of experience delivering high-performance, scalable, and maintainable applications across fintech, healthcare, e-commerce, and secure communications.
Jetpack Compose & Modern UI
Proficiency in Jetpack Compose, Material Design, and custom responsive UI development, enabling the creation of modern, intuitive, and visually consistent Android user interfaces.
Clean Architecture & Android Architecture Patterns
Deep knowledge of Clean Architecture, MVVM, MVP, modularization, and Kotlin Multiplatform (KMP), with a track record of leading architecture decisions and refactoring legacy codebases to modern standards.
Coroutines, Flow & Reactive Programming
Strong command of Kotlin Coroutines/Flow and RxJava for asynchronous programming, including migration of RxAndroid codebases to Kotlin Coroutines to improve performance and code clarity.
Dependency Injection
Hands-on experience with Dagger 2 and Hilt for dependency injection, ensuring maintainable and testable application architectures.
Networking & Backend Integration
Extensive use of Retrofit, REST APIs, WebSockets, VoIP/SIP, and Firebase for backend communication, real-time data exchange, and cloud service integration.
Bluetooth Low Energy (BLE) & Platform Integrations
Implementation and improvement of BLE communication for connected medical devices, as well as integration with AOSP/system applications, OCR libraries, and third-party platforms such as Shopify and Twilio.
Testing & Quality Assurance
Expansion of unit test coverage using Kotest and MockK, instrumented UI testing with Appium, and consistent application of code review processes and build optimization practices.
Team Leadership & Client Communication
Experience as team lead for mobile engineers, including task delegation, code reviews, mentoring, and direct coordination with clients and manufacturers to align technical requirements and best practices.
Expertise in Kotlin and Java as primary programming languages for Android development, with 11+ years of experience delivering high-performance, scalable, and maintainable applications across fintech, healthcare, e-commerce, and secure communications.
Jetpack Compose & Modern UI
Proficiency in Jetpack Compose, Material Design, and custom responsive UI development, enabling the creation of modern, intuitive, and visually consistent Android user interfaces.
Clean Architecture & Android Architecture Patterns
Deep knowledge of Clean Architecture, MVVM, MVP, modularization, and Kotlin Multiplatform (KMP), with a track record of leading architecture decisions and refactoring legacy codebases to modern standards.
Coroutines, Flow & Reactive Programming
Strong command of Kotlin Coroutines/Flow and RxJava for asynchronous programming, including migration of RxAndroid codebases to Kotlin Coroutines to improve performance and code clarity.
Dependency Injection
Hands-on experience with Dagger 2 and Hilt for dependency injection, ensuring maintainable and testable application architectures.
Networking & Backend Integration
Extensive use of Retrofit, REST APIs, WebSockets, VoIP/SIP, and Firebase for backend communication, real-time data exchange, and cloud service integration.
Bluetooth Low Energy (BLE) & Platform Integrations
Implementation and improvement of BLE communication for connected medical devices, as well as integration with AOSP/system applications, OCR libraries, and third-party platforms such as Shopify and Twilio.
Testing & Quality Assurance
Expansion of unit test coverage using Kotest and MockK, instrumented UI testing with Appium, and consistent application of code review processes and build optimization practices.
Team Leadership & Client Communication
Experience as team lead for mobile engineers, including task delegation, code reviews, mentoring, and direct coordination with clients and manufacturers to align technical requirements and best practices.
Experience
Professional experience10+ years
Freelancer since2026
Languages
BulgarianNative speakerEnglishGood
Project history
Development of QuantID, a digital identity wallet application built with Kotlin, Jetpack Compose, and Hilt on a multi-module Clean Architecture (MVVM/MVI). Implemented verifiable credential sharing flows based on OpenID4VP/OpenID4VC protocols, built core wallet features, expanded unit test coverage with Kotest and MockK, and resolved production crashes and UI/UX defects using feature flags and multi-language localization.
Developed the main application for a smart cooking assistant platform integrating an external projector device that displays recipes and guides the cooking process. Designed projected-interface interactions and managed communication between the manufacturer and the client to align technical specifications.
Led technical development of a medical device solution comprising an implant, a remote controller, and a companion mobile application. Refactored legacy code, collaborated with cross-functional teams to meet healthcare industry standards and regulatory compliance, and provided technical leadership and mentoring.