Personal details
Krystian W.
Summary
I am a seasoned Android developer with over a decade of experience across various roles and stages of the app lifecycleâfrom initial design and deployment, to ongoing growth and enhancement. I have helped launch startups, modernized legacy systems, and worked across entire tech stacks.
Adept in both dynamic startups and structured corporate settings, I excel both in roles that demand a wide-ranging skill set, and deep technical knowledge.
Work Experience
Goldman Sachs' personal finance app: Marcus
As a senior engineer, I participated in the comprehensive rewrite and rebranding of the legacy Marcus Android app, modernizing both the UI and architecture with Jetpack Compose and Kotlin Coroutines. I significantly contributed to the development and integration of major features, including credit card support, and led the redesign of UK savings accounts.
My role also included maintaining app stability by monitoring releases, managing runtime issues through triage and delegation, and writing necessary hotfixes. Additionally, I supported the team expansion by conducting technical interviews and mentoring junior team members.
A social video app designed for video creation and interaction with multimedia content. The app achieved over 100 million downloads and was ultimately acquired by Reddit.
Description of the acquisition by The Verge
As a senior Android engineer, I introduced advanced video editing tools including filters, clip composition, live streaming, and interactive stickers/effects, which significantly enhanced the app's creative capabilities and user engagement. I migrated the app's architecture from Java MVP to Kotlin MVI, improving both performance and maintainability.
My contributions also extended to developing key functionalities such as real-time chats, in-app payments, and streamlined phone registration processes. I participated actively in a mature, well-organized Scrum process, working closely with cross-functional teams to ensure rapid and iterative feature development.