Amit Sen - iOS & Android Developer, Tech Writer

Current

Storyblok GmbH•Remote

Jul 2024 - Present

Built cross-platform SDKs in Swift (iOS) and Kotlin (Android) using SwiftUI, Combine, Jetpack Compose, and Coroutines — reduced SDK integration time by 60% across 100+ client apps.
Implemented TCA, MVVM, and MVI architectures, improving maintainability, test coverage, and adoption across engineering teams.
Created 5+ developer tools and sample apps (3 SwiftUI, 2 Compose), cutting developer onboarding time and support requests by 40%, and driving 20% monthly SDK adoption growth.
Set up CI/CD pipelines with Fastlane, Cocoapods, Gradle, and GitHub Actions — release cycles became 30% faster and deployments more reliable.
Applied TDD with JUnit, Espresso, and XCTest, raising release stability and overall product quality.
Authored 100+ pages of technical documentation and API guides, reducing developer support tickets by ~40%.
Collaborated with product teams and open-source contributors to maintain feature parity and consistency across platforms.
Worked with data teams to propose unified approaches for mobile storage and processing algorithms, aligning directly with backend systems.
Promoted open-source adoption and developer community engagement, increasing SDK usage and ecosystem contributions.

Full-time

Active

SRH Berlin University of Applied Sciences•Berlin, Germany

May 2022 - Apr 2024

Lecturer in Computer Science — taught both introductory and advanced courses, covering fundamental principles as well as complex topics in the field.
Supervised Bachelor’s and Master’s theses, guiding students through research, methodology, and technical execution.

Full-time

LOTTO24 AG•Hamburg, Germany

Apr 2020 - Jun 2024

Migrated 80% of iOS screens to SwiftUI and Android screens to Jetpack Compose, improving accessibility compliance and raising UI test reliability by 35% for 2M+ active users.
Converted Objective-C to Swift (MVVM) and Java to Kotlin + Coroutines, cutting technical debt by 70% and simplifying long-term maintenance.
Built Core Data + REST API pipelines on iOS and optimized Flow/Coroutines on Android, reducing network latency by 30% and improving offline reliability.
Delivered Lotto widgets in SwiftUI and Compose with real-time updates, attracting 200K+ weekly users and boosting monetization by 18%.
Increased unit test coverage to 60% with XCTest, JUnit, Espresso, and Mockito, reducing regressions and strengthening release stability across OS versions.
Collaborated with product, design, and QA teams to align features across platforms and shorten release cycles.
Applied modern development practices (MVVM, SwiftUI, Jetpack Compose, Coroutines, TDD, CI/CD) to improve code quality and developer efficiency.

Full-time

Zalando SE•Dortmund, Germany

Aug 2018 - Mar 2020

Built payment SDKs in Swift and Kotlin processing 3M+ monthly transactions, cutting checkout latency by 15% and boosting conversion rates by 20%.
Designed local storage modules with SQLite and Core Data, ensuring reliable offline sync and faster transaction processing.
Delivered 10+ reusable UI components in SwiftUI/UIKit and Jetpack Compose, accelerating feature delivery speed by 30% and improving consistency across shopping flows.
Migrated high-traffic web checkout flows to native mobile (Kotlin + Swift), improving performance and increasing mobile adoption.
Applied RxJava, Flow, and Combine for reactive data handling, simplifying concurrency and improving system responsiveness.
Strengthened crash monitoring and observability pipelines, reducing app crashes and improving long-term stability across iOS and Android.
Partnered with backend and mobile teams across 30+ Agile sprints, aligning APIs, improving developer velocity, and delivering stable releases on schedule.

Full-time

Uber Inc.•Palo Alto, California

May 2016 - Jul 2018

Built GPS tracking and data monitoring systems in Swift and Kotlin for 10M+ monthly riders, improving location accuracy by 25% and reducing fraud cases.
Optimized background sync pipelines, reducing cold-start time from 8–12s → 3–5s, directly improving user retention and trip reliability.
Delivered real-time trip engagement features on iOS and Android, driving a 15% increase in daily active users (DAU) and aligning with revenue goals.
Designed on-device fraud detection tools in collaboration with backend and cross-platform teams, ensuring consistent protection across ecosystems.
Resolved 100+ critical crashes with a 90% fix rate using Xcode Instruments and Firebase Crashlytics, stabilizing apps at global scale.

Full-time

The University of Texas at Arlington•Arlington, TX, USA

Sep 2014 - Apr 2016

Worked as a Research Assistant in the Software Engineering Research Team, contributing to academic and applied research projects.
Focused on Mobile Profiling Data Analysis, exploring performance bottlenecks and optimization opportunities.
Applied Machine Learning and Big Data concepts, developing models and pipelines to analyze large-scale mobile usage datasets.

Full-time

Champs21•Dhaka, Bangladesh

Apr 2011 - Jul 2014

Built iOS (Objective-C) and Android (Java) apps adopted by 30K+ students across 200 schools, accelerating digital transformation in education.
Implemented offline data sync with SQLite for 10K+ student records, enabling seamless usability in low-connectivity environments.
Integrated secure local storage with encryption libraries on both platforms, improving compliance and reducing data exposure risks.
Maintained compatibility across 5 iOS versions and 12+ iOS/Android devices, minimizing fragmentation and ensuring consistent UX.
Optimized background services with GCD (iOS) and AsyncTasks/JobScheduler (Android), improving battery efficiency and app responsiveness.
Released 50+ product iterations in Agile sprints, shortening feedback loops and accelerating feature delivery.
Shipped analytics-driven engagement features, boosting student retention by 20%.

Full-time