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Marcin Szeptun

@marcinszeptun

Senior Android developer focused on performant, secure, user-centered mobile apps.

Poland
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What I'm looking for

I’m looking for a senior mobile role where I can own Android features, mentor engineers, improve architecture, and deliver secure, high‑quality user experiences in a collaborative, growth‑focused team.

I am a Senior Android developer with extensive experience building and owning features for high‑scale consumer and fintech mobile applications. I have led Android projects, introduced Jetpack Compose, and driven architecture improvements while mentoring teammates to raise code quality.

At companies from startups to large teams I delivered secure wallet and payment solutions, video upload features using AWS, onboarding optimizations, and migrated apps from Java/MVP to Kotlin and modern architectures. I prioritize testing, performance, and maintainable architecture including MVVM/MVI, Clean Architecture, and DI with Dagger/Hilt/Koin.

I bring strong cross‑functional collaboration with backend, iOS, design and product teams, a growth mindset, and a focus on measurable user outcomes such as conversion, stability, and efficiency.

Experience

Work history, roles, and key accomplishments

HP
Current

Senior Android Developer

Housecall Pro

Sep 2024 - Present (1 year 1 month)

Develop and own finance-related features in the Housecall Pro Android app, manage releases and user feedback, and implemented a partial large video upload using an AWS solution to improve media handling.

VE

Senior Android Developer

Vero

Aug 2022 - Jul 2024 (1 year 11 months)

Owned multiple Android features for a social app used by millions, introduced Jetpack Compose and best practices, and mentored developers to improve code quality and performance of image loading.

PA

Android Developer, Project Leader

PayEye

Jun 2020 - May 2021 (11 months)

Led Android development for PayEye Wallet, designed secure app architecture, implemented secure storage and anti-tamper measures, and built custom views and notification integration with POS terminals.

Education

Degrees, certifications, and relevant coursework

Wroclaw University of Science and Technology logoWT

Wroclaw University of Science and Technology

Master Degree, Computer Science (Software Engineering)

2019 - 2020

Completed a Master Degree in Computer Science with a specialty in Software Engineering between February 2019 and July 2020.

Wroclaw University of Science and Technology logoWT

Wroclaw University of Science and Technology

Bachelor Degree, Computer Science

2015 - 2019

Completed a Bachelor Degree in Computer Science from October 2015 to January 2019.

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Marcin Szeptun - Senior Android Developer - Housecall Pro | Himalayas