Open to opportunities

Igor Kowalski

@igorkowalski

Senior Android Developer at Zalando who improved catalogue load time by 35% with Room caching.

At Zalando, I owned the Android shopping journey from product discovery through checkout, and set Kotlin and MVVM patterns adopted by three feature teams. I added Room caching to the product catalogue, cutting initial list load time by 35%.

At Deliver Hero, I developed Kotlin features for a food-delivery Android app and reworked checkout around MVVM and Jetpack Components, reducing failed payment retries by 18%. I also improved the restaurant listing load path, reducing peak memory use by 22%.

Earlier, I built Android features for Revolut, Pipedrive, and early-stage startups, including banking, sales CRM, and customer-facing product flows. I value clear technical decisions and reliable releases, and work closely with product and design teams.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Zalando

Aug 2023 - Aug 2026 (3 years)

Owned the Android shopping journey from discovery to checkout, setting Kotlin and MVVM patterns adopted by three feature teams. Architected account and basket modules with Jetpack Components and introduced Hilt for dependency injection.

Kotlin Java Android Studio Jetpack components Jetpack Compose ROOM Hilt Dagger 2 Junit Espresso Git CI CD

Senior Backend Engineer

Deliver Hero

Mar 2019 - Jul 2023 (4 years 4 months)

Developed Kotlin features for the food-delivery Android app, including restaurant discovery and order status updates. Reworked the checkout flow around MVVM and Jetpack Components, reducing failed payment retries by 18%.

Kotlin Java Android Studio Jetpack components ROOM Hilt Junit Mockito Espresso Jenkins Fastlane Git

Back End Developer

Revolut

Aug 2018 - Feb 2019 (6 months)

Built Java features for Revolut's Android banking app, including transaction history and card controls. Implemented MVVM boundaries and added JUnit and Mockito tests for currency formatting and transfer validation.

Java Android Studio MVVM Retrofit OkHttp Junit Mockito Jenkins Git REST APIs

Full Stack Software Engineer

Pipedrive

Jan 2016 - Jul 2018 (2 years 6 months)

Developed Android and web features for Pipedrive's sales CRM, including mobile contact lookup and activity updates. Built Java screens with MVP and added JUnit and Mockito tests for activity scheduling.

Java Android Studio MVP SQLite Retrofit Junit Mockito Jenkins Git REST APIs

Software Engineer

Early stage startups

Jul 2014 - Dec 2015 (1 year 5 months)

Built Java Android features for early-stage products, including sign-in, profile editing, and mobile forms. Organized screen logic with MVP and Android SDK components, and added SQLite persistence for incomplete forms.