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I am a Senior Mobile Engineer with over 12 years of experience building robust native apps and SDKs across iOS and Android platforms. Skilled in Swift, Objective-C, Kotlin, Jetpack Compose, and Swift UI, I specialize in modular architectures, performance optimization, test strategy, and cross-functional collaboration. I have proven impact in healthcare, e-commerce, SaaS, and developer tools sectors, consistently improving code quality, CI stability, and reducing support tickets. Throughout my career, I have architected modular SDKs used in over 100 production apps and led technical discussions to align design decisions across teams. My work includes migrating legacy modules, enhancing app performance by 30%, integrating CI pipelines, and developing payment SDKs processing millions of transactions monthly. I enjoy delivering solutions with full test coverage in Agile setups and contributing actively in code reviews and crash triage to ensure product reliability.…I am a Senior Mobile Engineer with over 12 years of experience building robust native apps and SDKs across iOS and Android platforms. Skilled in Swift, Objective-C, Kotlin, Jetpack Compose, and Swift UI, I specialize in modular architectures, performance optimization, test strategy, and cross-functional collaboration. I have proven impact in healthcare, e-commerce, SaaS, and developer tools sectors, consistently improving code quality, CI stability, and reducing support tickets. Throughout my career, I have architected modular SDKs used in over 100 production apps and led technical discussions to align design decisions across teams. My work includes migrating legacy modules, enhancing app performance by 30%, integrating CI pipelines, and developing payment SDKs processing millions of transactions monthly. I enjoy delivering solutions with full test coverage in Agile setups and contributing actively in code reviews and crash triage to ensure product reliability.

Amit Sen

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I am a Senior Mobile Engineer with over 12 years of experience building robust native apps and SDKs across iOS and Android platforms. Skilled in Swift, Objective-C, Kotlin, Jetpack Compose, and Swift UI, I specialize in modular architectures, performance optimization, test strategy, and cross-functional collaboration. I have proven impact in healthcare, e-commerce, SaaS, and developer tools sectors, consistently improving code quality, CI stability, and reducing support tickets. Throughout my career, I have architected modular SDKs used in over 100 production apps and led technical discussions to align design decisions across teams. My work includes migrating legacy modules, enhancing app performance by 30%, integrating CI pipelines, and developing payment SDKs processing millions of transactions monthly. I enjoy delivering solutions with full test coverage in Agile setups and contributing actively in code reviews and crash triage to ensure product reliability.…I am a Senior Mobile Engineer with over 12 years of experience building robust native apps and SDKs across iOS and Android platforms. Skilled in Swift, Objective-C, Kotlin, Jetpack Compose, and Swift UI, I specialize in modular architectures, performance optimization, test strategy, and cross-functional collaboration. I have proven impact in healthcare, e-commerce, SaaS, and developer tools sectors, consistently improving code quality, CI stability, and reducing support tickets. Throughout my career, I have architected modular SDKs used in over 100 production apps and led technical discussions to align design decisions across teams. My work includes migrating legacy modules, enhancing app performance by 30%, integrating CI pipelines, and developing payment SDKs processing millions of transactions monthly. I enjoy delivering solutions with full test coverage in Agile setups and contributing actively in code reviews and crash triage to ensure product reliability.

Available to hire

I am a Senior Mobile Engineer with over 12 years of experience building robust native apps and SDKs across iOS and Android platforms. Skilled in Swift, Objective-C, Kotlin, Jetpack Compose, and Swift UI, I specialize in modular architectures, performance optimization, test strategy, and cross-functional collaboration. I have proven impact in healthcare, e-commerce, SaaS, and developer tools sectors, consistently improving code quality, CI stability, and reducing support tickets.

Throughout my career, I have architected modular SDKs used in over 100 production apps and led technical discussions to align design decisions across teams. My work includes migrating legacy modules, enhancing app performance by 30%, integrating CI pipelines, and developing payment SDKs processing millions of transactions monthly. I enjoy delivering solutions with full test coverage in Agile setups and contributing actively in code reviews and crash triage to ensure product reliability.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Language

English

Fluent

German

Beginner

Bengali

Fluent

Work Experience

Senior Mobile Engineer at Storyblok GmbH

July 1, 2024 - Present

Architected modular SDKs using Swift and Kotlin, deployed in 100+ production apps. Drove test-first development with XC Test and Espresso improving CI stability. Delivered Swift UI tools and Jetpack Compose samples for client onboarding. Led technical discussions between iOS & Android SDK teams to align design decisions. Reduced support tickets by 40% via code samples, debug tools, and documentation.

Senior Mobile Developer at Lotto24 AG

June 30, 2024 - August 20, 2025

Migrated legacy Objective-C & Java modules to Swift MVVM and Kotlin MVVM. Developed Lotto widgets and Android homescreen features used by 200K+ users. Boosted app performance by 30% using Combine and Kotlin coroutines. Integrated CI pipelines with Fastlane (iOS) and Gradle tasks (Android). Led crash triage and issue resolution across platforms with QA and backend teams.

Senior Mobile Engineer at Zalando SE

March 1, 2020 - August 20, 2025

Built native Swift and Kotlin payment SDKs processing over 3 million transactions monthly. Reduced latency in iOS and Android checkout flows via shared optimization logic. Replaced hybrid webviews with fully native modules using UIKit and Android Views. Reviewed cross-platform code ensuring parity and accessibility compliance. Delivered sprint features bi-weekly within Agile setup with full test coverage.

Mobile Engineer at Uber Inc.

July 1, 2018 - August 20, 2025

Built shared GPS tracking algorithms in Objective-C and Java across platforms. Improved cold-start sync from 8s to 3s with optimized background location logic. Investigated 100+ crash reports using Instruments and Android Profiler, resolving 90%. Coordinated with iOS, Android, and backend teams on real-time sync APIs. Drove field issue diagnostics using custom debug builds and monitoring tools.

Mobile Developer at Champs 21

July 1, 2014 - August 20, 2025

Developed core learning features in Objective-C and Java for 30K+ students. Built offline sync and secure local storage with Core Data and SQLite. Maintained app compatibility across 5 iOS versions and 10+ Android devices. Participated in weekly feedback loops to rapidly fix field-reported bugs and contribute to testing, release, and QA cycles for App Store and Play Store.