Available to hire
I’m Javad Vatandoost, a Senior Android Developer based in Istanbul, Türkiye, with 7 years of experience building scalable, high-performance mobile apps using Kotlin, Jetpack Compose, and Clean Architecture. I’ve worked on international projects (Finland, Italy) and collaborated across product, design, and backend teams to deliver strong user experiences. I speak English fluently and am open to relocating for opportunities.
I excel at modern architectures (MVVM, MVI, SOLID), modularizing legacy code, and improving build times and debugging efficiency. My strengths include DI with Hilt/Koin, unit and BDD testing, and ensuring robust security with AES/RSA encryption. I thrive in global teams and enjoy turning complex requirements into clean, maintainable code.
Language
English
Fluent
Persian
Fluent
Work Experience
Senior Android Developer at Dotin.ir
May 1, 2024 - PresentDesigned modularization by layer using Gradle Conventions, streamlining plugin management, and reducing build time by 15% per build logs. Applied MVVM and MVI patterns with Jetpack Compose for a modern UI, increasing user engagement by 25% based on analytics. Employed BDD and JUnit testing with Jetpack Compose, decreasing crashes by 20% as noted in crash reports.
Senior Android Developer at Hammtek.com
September 30, 2023 - July 15, 2025Built an Android app for real-time STM board's camera data streaming via USB protocols, achieving 99% transfer accuracy. Created video recording and AI processing within the API, ensuring seamless data integration.
Senior Android Developer at Vasni
June 30, 2022 - July 15, 2025Refactored legacy code into 14 feature modules using SOLID principles and Clean Architecture, reducing debugging time by 20%. Migrated MVC to MVP architecture, enabling 10% faster feature development per sprint metrics.
Android Developer at P-gum
September 30, 2020 - July 15, 2025Engineered a fraud-detection algorithm for a fitness app, improving step-count accuracy by 15% per user testing. Integrated AES/RSA encryption for user data, reducing security vulnerabilities by 30% per OWASP scans. Enhanced navigation with Google Maps, increasing user retention by 10% per analytics.
Android Developer at Mth-co.ir (Badesabal.ir)
December 31, 2017 - July 15, 2025Revamped a legacy Android app (Java/XML) using SOLID principles, improving app stability by 25% per Crashlytics reports. Resolved 50+ historical bugs using Crashlytics, enhancing app stability.
Senior Android Developer at Dotin.ir
May 1, 2024 - PresentDesigned modularization by layer using Gradle Conventions to streamline plugin management, reducing build time by 15%. Applied MVVM and MVI patterns with Jetpack Compose for a modern UI, increasing user engagement by 25%. Employed BDD and JUnit testing which decreased crashes by 20%.
Senior Android Developer at Hammtek.com
September 30, 2023 - July 15, 2025Built an Android app for real-time STM board's camera data streaming via USB protocols achieving 99% transfer accuracy. Created video recording and AI processing within the API for seamless data integration.
Senior Android Developer at Vasni
June 30, 2022 - July 15, 2025Refactored legacy code into 14 feature modules using SOLID principles and Clean Architecture reducing debugging time by 20%. Migrated MVC to MVP architecture enabling 10% faster feature development per sprint.
Android Developer at P-gum
September 30, 2020 - July 15, 2025Engineered a fraud-detection algorithm for a fitness app, improving step-count accuracy by 15%. Integrated AES/RSA encryption for user data reducing security vulnerabilities by 30%. Enhanced navigation with Google Maps increasing user retention by 10%.
Android Developer at Mth-co.ir (Badesabal.ir)
December 31, 2017 - July 15, 2025Revamped a legacy Android app using SOLID principles improving app stability by 25%. Resolved over 50 historical bugs using Crashlytics enhancing app stability.
Senior Android Developer at Dotin .ir
May 1, 2024 - PresentDesigned modularization by layer using Gradle Conventions, streamlining plugin management, and reducing build time by 15%. Applied MVVM and MVI patterns with Jetpack Compose for a modern UI, increasing user engagement by 25% based on analytics. Employed BDD and JUnit testing with Jetpack Compose, decreasing crashes by 20% as noted in crash reports.
Senior Android Developer at Hammtek.com
September 1, 2023 - September 25, 2025Built an Android app for real-time STM board's camera data streaming via USB protocols, achieving 99% transfer accuracy. Created video recording and AI processing within the API, ensuring seamless data integration.
Senior Android Developer at Vasni
November 1, 2021 - September 25, 2025Refactored legacy code into 14 feature modules using SOLID principles and Clean Architecture, reducing debugging time by 20%. Migrated MVC to MVP architecture, enabling 10% faster feature development per sprint metrics.
Android Developer at P-gum
September 1, 2020 - September 25, 2025Engineered a fraud-detection algorithm for a fitness app, improving step-count accuracy by 15% per user testing. Integrated AES/RSA encryption for user data, reducing security vulnerabilities by 30% per OWASP scans. Enhanced navigation with Google Maps, increasing user retention by 10% per analytics.
Android Developer at Mth -co.ir (Badesaba l.ir)
December 1, 2017 - September 25, 2025Revamped a legacy Android app (Java/XML) using SOLID principles, improving app stability by 25% per Crashlytics reports. Resolved 50+ historical bugs using Crashlytics, enhancing app stability.
Senior Android Developer | Team Lead at Rooritm Project
September 1, 2022 - September 25, 2025Led development for Rooritm, a global media app delivering music, podcasts, live streams, and radio. Implemented ExoPlayer for streaming and collaborated with backend and design teams to ensure reliable playback and data integration.
Android Developer at PlayViaggi Club Project for Italy
June 1, 2021 - September 25, 2025Created a travel booking app, improving user navigation efficiency by 20% through an intuitive UI.
Senior Android Developer at ECG Project
December 1, 2020 - September 25, 2025Developed ECG app interfaces with hardware to capture heart signals. Achieved 95% accuracy in signal classification through Bluetooth integration with hardware.
Senior Android Developer at Dotin.ir
May 1, 2024 - PresentRemote role. Designed modularization by layer using Gradle Conventions, streamlining plugin management and reducing build time by 15% per build logs. Applied MVVM and MVI patterns with Jetpack Compose for a modern UI, increasing user engagement by 25% based on analytics. Employed BDD and JUnit testing with Jetpack Compose, decreasing crashes by 20% as noted in crash reports.
Senior Android Developer at Hammtek.com
September 1, 2023 - September 25, 2025Part-time role. Built an Android app for real-time STM board's camera data streaming via USB protocols, achieving 99% transfer accuracy. Created video recording and AI processing within the API, ensuring seamless data integration.
Senior Android Developer at Vasni
November 1, 2021 - September 25, 2025On-site role. Refactored legacy code into 14 feature modules using SOLID principles and Clean Architecture, reducing debugging time by 20%. Migrated MVC to MVP architecture, enabling 10% faster feature development per sprint metrics.
Android Developer at P-gum
September 1, 2020 - September 25, 2025On-site role. Engineered a fraud-detection algorithm for a fitness app, improving step-count accuracy by 15% per user testing. Integrated AES/RSA encryption for user data, reducing security vulnerabilities by 30% per OWASP scans. Enhanced navigation with Google Maps, increasing user retention by 10% per analytics.
Android Developer at Mth-co.ir (Badesaba l.ir)
December 1, 2017 - September 25, 2025On-site role. Revamped a legacy Android app (Java/XML) using SOLID principles, improving app stability by 25% per Crashlytics reports. Resolved 50+ historical bugs using Crashlytics, enhancing app stability.
Senior Android Developer at Dotin.ir
May 1, 2024 - PresentDesigned modularization by layer using Gradle Conventions, streamlining plugin management, reducing build time by 15%. Applied MVVM and MVI patterns with Jetpack Compose for a modern UI, increasing user engagement by 25%. Employed BDD and JUnit testing with Jetpack Compose, decreasing crashes by 20%.
Senior Android Developer at Hammtek.com
September 30, 2023 - September 26, 2025Built an Android app for real-time STM board's camera data streaming via USB protocols, achieving 99% transfer accuracy. Created video recording and AI processing within the API, ensuring seamless data integration.
Senior Android Developer at Vasni
November 30, 2021 - September 26, 2025Refactored legacy code into 14 feature modules using SOLID principles and Clean Architecture, reducing debugging time by 20%. Migrated MVC to MVP architecture, enabling 10% faster feature development per sprint metrics.
Android Developer at P-gum
September 30, 2020 - September 26, 2025Engineered a fraud-detection algorithm for a fitness app, improving step-count accuracy by 15% per user testing. Integrated AES/RSA encryption for user data, reducing security vulnerabilities by 30% per OWASP scans. Enhanced navigation with Google Maps, increasing user retention by 10% per analytics.
Android Developer at Mth-co.ir (Badesaba l.ir)
December 31, 2017 - September 26, 2025Revamped a legacy Android app (Java/XML) using SOLID principles, improving app stability by 25% per Crashlytics reports. Resolved 50+ historical bugs using Crashlytics, enhancing app stability.
Education
Bachelor's degree at Azad University (IAU)
January 1, 2015 - December 31, 2015Bachelor's degree at Azad University (IAU)
January 1, 2015 - December 31, 2015Bachelor's degree at Azad University (IAU)
January 11, 2030 - September 25, 2025Bachelor's degree at Azad University (IAU)
January 11, 2030 - September 25, 2025Bachelor's degree in Computer Software Engineering at Azad University (IAU)
January 11, 2030 - September 26, 2025Qualifications
Industry Experience
Software & Internet, Financial Services, Healthcare, Travel & Hospitality, Media & Entertainment, Manufacturing, Professional Services, Education
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