Krystian Wsul

Dubsmash

Senior Engineer

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.

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.

Acquisition according to Reddit
Acquisition according to The Verge

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CarTrek

Lead Engineer

A white-label car-sharing app serving companies with clients across Europe and Asia, enabling the rental of both private and company-owned cars.

As the lead Android engineer, I was responsible for implementing significant new features, including support for multiple map providers and advanced payment processing. Additionally, I managed the app's customization for rebranding to various client specifications, and performed ongoing maintenance and modernization of the app and infrastructure.

Website

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Shadda

Lead Engineer

A platform designed to bridge the gap between clients and local businesses capable of home deliveries but lacking proprietary ordering infrastructure, with separate apps for both clients and businesses.

As the Android engineer for the business app, I integrated key functionalities including Google Maps and Mapbox navigation. My responsibilities also involved communicating with the Firebase backend and executing a comprehensive visual redesign of the app.

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Airon

App Creator

A platform that enables users to post and browse video reviews of smartphones, enriched with social media features.

As the sole Android engineer and lead architect, I designed and developed the Android app, ensuring seamless integration with the other platforms and video hosting service. I played a major role in both the UX and UI design processes and led architectural decisions for the iOS and Web clients, as well as the backend infrastructure. My responsibilities also included integrating social functionalities to actively engage the user community.

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FireWatch Solutions

App Creator

FireWatch Solutions specializes in providing tailored security services to clients traveling to high-risk areas around the world.

I developed an internal-use Android app designed specifically for employees conducting collaborative security evaluations at future client destinations. As the sole developer, my responsibilities included enabling the capture and integration of multimedia and geospatial data, the construction of detailed area maps, and the creation of custom graphical elements such as floor plans.

Website

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DOSA

App Creator

My client wanted an Android app that would complement a Facebook group he had been running, used to exchange clothing, as well as an administration panel. I built an app that allows users to showcase clothing items they have for sale, chat about them, and arrange transactions.

Some notable technologies used in the project include phone number verification, image capture and uploads, push notifications, and realtime chat.

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Time Guru

Lead Engineer

An Android app designed as a sophisticated metronome for musical practice, equipped with advanced features including the ability to handle combinations of time signatures.

Over the years, my role has encompassed implementing new functionalities, executing comprehensive app redesigns, and maintaining overall app performance to ensure reliability and user satisfaction.

Website
App

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MaxiPizza

App Creator

MaxiPizza is a pizza restaurant chain with numerous locations across Poland.

As the second member of a growing in-house development team, I was responsible for architecting and developing the comprehensive technological framework spanning multiple platforms, including Windows and Unix servers, various databases, and communication protocols. My role as the chief developer involved building the backend infrastructure, a robust online ordering system, and Android applications for customer order placement and delivery tracking. Additionally, I engineered desktop software for generating invoices and managing employee tasks, integrated third-party ordering services, and redesigned intranet tools for restaurant management, and implemented automated email and SMS marketing campaigns.

Website
Android App
iPhone App

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