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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.…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

App Developer, Programmer, Developer, +5

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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.…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.

Skills

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.