I'm a Senior Android Developer with over 10 years of experience. I've launched more than 20 apps totaling over 50,000 installations. I'm an expert in Kotlin, Jetpack, and modern Android technologies. I've achieved a 400% increase in online payments and a 99% reduction in app crashes through strategic innovations. I am skilled in leading teams and delivering solutions that drive business success. My career has allowed me to work on diverse projects from fintech apps to social networks and dash cams, gaining expertise in actionable development, performance optimization, and team leadership. I thrive on collaborating cross-functionally to build products that enhance user experience and business outcomes.

Alexander Mamayenko

I'm a Senior Android Developer with over 10 years of experience. I've launched more than 20 apps totaling over 50,000 installations. I'm an expert in Kotlin, Jetpack, and modern Android technologies. I've achieved a 400% increase in online payments and a 99% reduction in app crashes through strategic innovations. I am skilled in leading teams and delivering solutions that drive business success. My career has allowed me to work on diverse projects from fintech apps to social networks and dash cams, gaining expertise in actionable development, performance optimization, and team leadership. I thrive on collaborating cross-functionally to build products that enhance user experience and business outcomes.

Available to hire

I’m a Senior Android Developer with over 10 years of experience. I’ve launched more than 20 apps totaling over 50,000 installations. I’m an expert in Kotlin, Jetpack, and modern Android technologies. I’ve achieved a 400% increase in online payments and a 99% reduction in app crashes through strategic innovations. I am skilled in leading teams and delivering solutions that drive business success.

My career has allowed me to work on diverse projects from fintech apps to social networks and dash cams, gaining expertise in actionable development, performance optimization, and team leadership. I thrive on collaborating cross-functionally to build products that enhance user experience and business outcomes.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
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Language

English
Intermediate
Ukrainian
Fluent
Russian
Fluent

Work Experience

Mobile Tech Lead at InterPay
April 30, 2025 - July 14, 2025
Recruited and assembled a high-performing development and marketing team; collaborated with C-level executives to define vision, goals, and tasks. Increased QR recognition speed by 8x through advanced technology and optimization. Achieved a 400% increase in online payments by optimizing payment processes and leveraging strategic marketing initiatives.
Senior Android Developer at Billo
April 30, 2023 - July 14, 2025
Co-developed the Billo Fintech App from scratch alongside another developer, delivering a high-quality application in 9 months. Implemented bill management and invoice viewing features to improve financial service accessibility and user convenience. Achieved 50,000 active users within 9 months, significantly enhancing user adoption. Reduced app crashes by 98% through Crashlytics and CI/CD integration, resulting in a 40% increase in user satisfaction and retention.
Senior Android Developer at Dashcam
December 31, 2021 - July 14, 2025
Led accelerated development of DashcamUa, delivering the project 2 months ahead of schedule. Engineered data collection capturing video and sensor data to enhance car accident recognition for 10,000+ users. Implemented automatic accident detection and dual-camera recording, benefiting 50+ insurance companies and law enforcement agencies. Presented successfully to government and police officials, leading to potential integration with 500+ units. Improved accident analysis and safety, increasing user adoption by 30%.
Senior Android Developer at Airsofter
April 30, 2021 - July 14, 2025
Solely developed and launched the Airsofter social network app from concept to deployment within 9 months, creating a niche platform for airsoft players. Developed key social networking features including user profiles, event management, and messaging, fostering a 40% increase in community engagement. Achieved over 5,000 downloads and a 4.5-star Google Play rating in 6 months. Designed and integrated a custom UI/UX, improving retention by 30%. Reduced app crashes by 92% through testing and optimization, ensuring high user satisfaction.
Middle Android Developer at Fast-Shine
March 1, 2020 - July 14, 2025
Led the development and architecture of the DaxApp trading app, a MetaTrader clone for cryptocurrencies, designing UI and business logic while managing a remote team. Refactored codebases for multiple projects, improving maintainability by 30% and reducing bug reports by 25%. Enhanced user experience via new features and critical bug fixes in cryptocurrency wallet and betting apps. Contributed to GPNS Provider app deployment for GazProm, streamlining delivery management and operational efficiency.
Founder | Product Owner | Developer at VkPhotos
June 30, 2021 - July 14, 2025
Created an Android app for Vkontakte dropshippers and later developed a Windows .NET app after identifying demand for desktop functionality. Grew user base by 300% shortly after Windows launch and achieved 10x user growth over 6 months through continuous enhancements. Created a high-conversion landing page and ad campaigns with a 67% conversion rate. Managed product development, marketing, and customer acquisition independently while expanding app features to improve retention.
Middle Android Developer at Inteza Solutions
March 31, 2017 - July 14, 2025
Junior Android Developer at Uran Company
September 30, 2015 - July 14, 2025
Mobile Tech Lead at InterPay
April 30, 2025 - July 14, 2025
Recruited and assembled a high-performing development and marketing team, collaborating with C-level executives to define clear vision, goals, and tasks. Increased QR recognition speed by 8x through advanced recognition technology and performance optimization. Achieved a 400% increase in online payments by optimizing payment processes and leveraging strategic marketing initiatives.
Senior Android Developer at Billo
April 30, 2023 - July 14, 2025
Co-developed the Billo Fintech App from scratch, partnering with another Android developer to deliver a high-quality application in 9 months. Implemented bill management and invoice viewing features, improving financial service accessibility and user convenience. Achieved 50,000 active users in the first 9 months, significantly driving user adoption and market presence. Reduced app crashes by 98% through Crashlytics and CI/CD integration, resulting in a 40% increase in user satisfaction and retention.
Senior Android Developer at Dashcam
December 31, 2021 - July 14, 2025
Led accelerated development of DashcamUa, delivering project 2 months ahead of schedule within 7 months. Engineered data collection system capturing video footage and phone sensor data, enhancing car accident recognition and dual-camera recording for 10,000+ users. Implemented automatic accident detection and dual-camera recording, providing safety insights for 50+ insurance companies and law enforcement agencies. Achieved successful presentation to government and police, leading to potential integration with 500+ units. Improved accident analysis and safety measures, increasing user adoption by 30%.
Senior Android Developer at Airsofter
April 30, 2021 - July 14, 2025
Solely developed and launched the Airsofter social network app within 9 months, addressing a niche platform for airsoft players. Implemented core social networking features including profiles, event management, and messaging, resulting in a 40% increase in community engagement. Achieved over 5,000 downloads and a 4.5-star Google Play rating within 6 months. Designed and integrated custom UI/UX improving user retention by 30%. Reduced app crashes by 92% through comprehensive testing and performance optimization.
Middle Android Developer at Fast-Shine
March 31, 2020 - July 14, 2025
Led development and architecture of DaxApp trading application, a MetaTrader clone for cryptocurrencies, designing UI and business logic and coordinating a remote team. Refactored and enhanced multiple codebases including Fast and Shine Car Wash app, improving code maintainability by 30% and reducing bug reports by 25%. Implemented new features and fixed critical bugs in various apps such as ESR Solutions’ cryptocurrency wallet and AirBet. Developed transaction animations and REST API interactions, boosting user engagement. Contributed to deployment of GPNS Provider app for GazProm, streamlining delivery management.
Founder | Product Owner | Developer at VkPhotos
June 30, 2021 - July 14, 2025
Developed Android app for Vkontakte dropshippers; expanded to Windows .NET app upon identifying demand for desktop functionality. Increased user base by 300% shortly after Windows launch and achieved 10x growth over 6 months through continuous enhancements. Created high-converting landing page and ad campaigns reaching 67% conversion rate. Expanded app features to meet dropshipper needs and improved retention. Managed all aspects of development, marketing, and customer acquisition independently.
Middle Android Developer at Inteza Solutions
March 31, 2017 - July 14, 2025
Junior Android Developer at Uran Company
September 30, 2015 - July 14, 2025
Mobile Tech Lead at InterPay
April 30, 2025 - August 6, 2025
Recruited and assembled a high-performing development and marketing team, collaborating with C-level executives to define clear vision, goals, and tasks. Increased QR recognition speed by 8x through advanced recognition technology and performance optimization. Achieved a 400% increase in online payments by optimizing payment processes and leveraging strategic marketing initiatives.
Senior Android Developer at Billo
April 30, 2023 - August 6, 2025
Co-developed the Billo Fintech app from scratch with another Android developer delivering a high-quality application in 9 months. Implemented bill management and invoice viewing features, improving financial service accessibility and user convenience. Achieved 50,000 active users in the first 9 months, significantly driving user adoption and market presence. Reduced app crashes by 98% through Crashlytics and CI/CD integration, resulting in a 40% increase in user satisfaction and retention.
Senior Android Developer at Dashcam
December 31, 2021 - August 6, 2025
Led the accelerated development of Dashcam UA, delivering the project 2 months ahead of schedule within a 7-month timeline. Engineered a data collection system capturing video footage and phone sensor data, enhancing car accident recognition and dual-camera recording for 10,000+ users. Implemented automatic accident detection and dual-camera recording, providing safety insights for 50+ insurance companies and law enforcement agencies. Successfully presented to government and police officials, leading to potential integration with 500+ government and law enforcement units. Improved accident analysis and safety measures, leading to a 30% increase in user adoption and engagement through advanced app functionality.
Senior Android Developer at Airsofter
April 30, 2021 - August 6, 2025
Solely developed and launched the Airsofter social network app, leading the entire development lifecycle from concept to deployment within 9 months, addressing the challenge of creating a niche platform for airsoft players. Implemented core social networking features including user profiles, event management, and messaging, fostering a 40% increase in community engagement and player interaction. Achieved over 5,000 downloads and a 4.5-star rating on Google Play within the first 6 months by utilizing best practices in Android development, ensuring a stable and scalable app architecture. Designed and integrated a custom UI/UX, which improved user retention by 30%, creating a more engaging and seamless experience tailored to the airsoft community. Reduced app crashes by 92% through comprehensive testing, debugging, and performance optimization, resulting in a smooth user experience and high user satisfaction.
Midle Android Developer at Fast-Shine
March 31, 2020 - August 6, 2025
Led the development and architecture of the Dax App trading application, a Meta Trader clone for cryptocurrencies, by designing the UI and business logic while coordinating a remote team of developers. Refactored and enhanced existing codebases for multiple projects including the Fast and Shine Car Wash app, leading to a 30% improvement in code maintainability and a 25% reduction in bug reports. Implemented new features and fixed critical bugs in various applications including ESR Solutions’ cryptocurrency wallet and Air Bet, significantly improving user experience and app stability. Developed and integrated advanced functionalities such as transaction animations and REST API interactions, boosting user engagement and transaction efficiency. Contributed to the successful deployment of the GPNS Provider app for GazProm, streamlining delivery management processes and enhancing operational efficiency.
Founder | Product Owner | Developer at VkPhotos
June 30, 2021 - August 6, 2025
Developed an Android app for Vkontakte dropshippers, addressing mobile user needs. Identified demand for desktop functionality, leading to the development of a Windows .NET app. Increased user base by 300% shortly after launching the Windows version. Achieved 10x growth in total users over 6 months through continuous enhancements. Created a high-converting landing page and ad campaigns, reaching a 67% conversion rate. Expanded app features to meet the specific needs of dropshippers, improving user retention. Managed all aspects of product development, marketing, and customer acquisition independently.
Midle Android Developer at Inteza Solutions
March 31, 2017 - August 6, 2025
Junior Android Developer at Uran Company
September 30, 2015 - August 6, 2025

Education

Bachelor degree at Zaporizhzhya institute of economics and information technologies
January 1, 2012 - December 31, 2016
Junior Specialist at Zaporizhzhya aviation college
January 1, 2008 - December 31, 2012
Bachelor degree at Zaporizhzhya institute of economics and information technologies
January 1, 2012 - December 31, 2016
Junior Specialist at Zaporizhzhya aviation college
January 1, 2008 - December 31, 2012
Bachelor degree at Zaporizhzhya Institute of Economics and Information Technologies
January 1, 2012 - January 1, 2016
Junior Specialist at Zaporizhzhya Aviation College
January 1, 2008 - January 1, 2012

Qualifications

Software Development
January 1, 2013 - December 31, 2014
Base Software Development
January 1, 2004 - December 31, 2008
Software Development
January 1, 2013 - December 31, 2014
Base Software Development
January 1, 2004 - December 31, 2008
Software Development
January 1, 2013 - January 1, 2014
Base Software Development
January 1, 2004 - January 1, 2008

Industry Experience

Software & Internet, Financial Services, Government, Transportation & Logistics, Professional Services