Senior Android Technical Lead with 12+ years of specialized Android development experience and 25+ years in software engineering. Proven expertise in Server Driven UI, Micro App Architecture, and leading large-scale migrations in production applications. Successfully built 5+ startups from concept to MVP and led cross-functional teams of up to 10 people. Expert in modern Android architecture patterns (MVVM, MVI, MVP), modular architecture, and technical mentorship. Experienced in banking, trading, and high-stakes applications requiring reliability and regulatory compliance. I value collaboration, clean architecture, and delivering tangible results that make a real difference for users. I enjoy mentoring teammates, driving architectural decisions, and delivering robust mobile products in fast-paced environments.

Sergii Tymofieiev

Senior Android Technical Lead with 12+ years of specialized Android development experience and 25+ years in software engineering. Proven expertise in Server Driven UI, Micro App Architecture, and leading large-scale migrations in production applications. Successfully built 5+ startups from concept to MVP and led cross-functional teams of up to 10 people. Expert in modern Android architecture patterns (MVVM, MVI, MVP), modular architecture, and technical mentorship. Experienced in banking, trading, and high-stakes applications requiring reliability and regulatory compliance. I value collaboration, clean architecture, and delivering tangible results that make a real difference for users. I enjoy mentoring teammates, driving architectural decisions, and delivering robust mobile products in fast-paced environments.

Available to hire

Senior Android Technical Lead with 12+ years of specialized Android development
experience and 25+ years in software engineering. Proven expertise in Server Driven UI,
Micro App Architecture, and leading large-scale migrations in production applications.
Successfully built 5+ startups from concept to MVP and led cross-functional teams of up to
10 people. Expert in modern Android architecture patterns (MVVM, MVI, MVP), modular
architecture, and technical mentorship. Experienced in banking, trading, and high-stakes
applications requiring reliability and regulatory compliance.

I value collaboration, clean architecture, and delivering tangible results that make a real difference for users. I enjoy mentoring teammates, driving architectural decisions, and delivering robust mobile products in fast-paced environments.

See more

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate

Language

Ukrainian
Fluent
Russian
Fluent
English
Advanced
Spanish; Castilian
Advanced

Work Experience

Lead Android Developer at Dow Jones
November 1, 2024 - Present
Led Android development for the Wall Street Journal app, ensuring high code quality and user satisfaction. Implemented modular architecture, improving maintainability and scalability. Collaborated with cross-functional teams to launch new features and reduce crash rates.
Lead Developer at BMFN P ltd
November 1, 2024 - September 1, 2025
Led development of trading and banking applications for Forex and CFD platforms. Delivered white-label trading application used by multiple end users. Created a universal banking software system, covering UI and backend integration.
Android Developer at Apiko Software
April 1, 2021 - September 1, 2025
Built personal safety applications featuring audio streaming, GPS tracking, and emergency features. Published and maintained apps on the Play Store. Ensured compatibility across Android versions and device types.
Android Developer at Noww
June 1, 2021 - September 1, 2025
Delivered software solutions for food service and fitness industries. Managed Android development of customer and worker-facing apps. Led creation of an online fitness marathon app with video, scheduling, and payment modules.
Other at MSL State Lotteries / Notinum — Kyiv, Ukraine
May 1, 2021 - September 1, 2025
Worked in unspecified roles over several years.
Lead Android Developer at Dow Jones
November 1, 2024 - Present
Lead Android development for the Wall Street Journal app, ensuring high code quality and user satisfaction. Implemented modular Micro App Architecture, improved maintainability and scalability. Led migration to a new microservice architecture for content rendering. Implemented Server Driven UI components for dynamic content updates.
Team Lead & Senior Android Developer at Multiple clients (Platinum FX, GM FX Forex, Swiss Capital, Apiko Software)
October 31, 2024 - October 17, 2025
Led development of white-label Forex/CFD trading platform and universal banking software. Delivered native iOS and Android apps covering UI and backend integration. Led a team of 4 Android developers and made architectural decisions including SDUI for instant updates. Worked across multiple branded apps.
Team Lead & Senior Android Developer at Multiple clients (Platinum FX, GM FX Forex, Swiss Capital, Apiko Software)
December 31, 2022 - October 17, 2025
Led architecture migration from a custom pattern to MVP. Published and maintained apps on the Google Play Store. Ensured compatibility across Android versions and device types. Apps included Platinum FX, GM FX Forex, Swiss Capital, and Apiko Software.
Android Developer & Software Engineer
January 31, 2021 - October 17, 2025
Delivered software solutions for food service and fitness industries. Managed Android development of customer- and worker-facing apps. Led an online fitness marathon app with video streaming, scheduling, and payments. Designed a complete software ecosystem including mobile and web applications.
Android Developer & Software Engineer at multiple companies
May 31, 2019 - October 17, 2025
Extensive experience across multiple companies developing Android applications, POS systems, lottery software, e-commerce platforms, BLE security applications, and enterprise business management systems. Key projects included lottery sales software with POS terminal integration, BLE personal security apps, internal logistics solutions, and accounting/business management systems.

Education

Master's Diploma at Kryvyi Rih National University — Kryvyi Rih, Ukraine Faculty of Electrical Engineering
January 1, 1992 - January 1, 1997
Postgraduate Studies at Kryvyi Rih National University — Kryvyi Rih, Ukraine Faculty of Electrical Engineering
January 1, 1997 - January 1, 1999
Master’s Diploma at Kryvyi Rih National University
January 1, 1992 - December 31, 1997
Postgraduate Studies at Kryvyi Rih National University
January 1, 1997 - December 31, 1999

Qualifications

Add your qualifications or awards here.

Industry Experience

Financial Services, Software & Internet, Healthcare, Consumer Goods, Media & Entertainment, Professional Services