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Michael User

@michaeluser38

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Staff mobile engineer specializing in secure Android and iOS architecture at scale.

United States

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What I'm looking for

I’m looking to lead secure Android/iOS platform modernization, build scalable architectures, and ship measurable outcomes—performance, reliability, and engagement—within cross-functional teams that value quality, mentorship, and fast iteration.

I’m a Staff Mobile Engineer with 6+ years of progressive experience architecting, modernizing, and scaling Android and iOS platforms across fintech, telehealth, IoT, warehouse automation, AR field systems, and retail commerce. I focus on security-first mobile engineering and delivering measurable business outcomes in multi-team environments.

Most recently, I architected a multi-module Android application using Kotlin and Jetpack Compose while leading parallel iOS development in SwiftUI and MVVM-C, consolidating three legacy banking apps into a single scalable super app and reducing annual maintenance overhead by 24%. I implemented secure authentication and identity management using OAuth2/OIDC with AWS Cognito, biometric auth, and encrypted token storage (Android Keystore / Secure Enclave), enabling PCI-DSS audit certification with zero high-risk remediation findings.

I also integrate fintech ecosystems and build real-time experiences with confidence—coordinating Plaid, Stripe SDK, and Mastercard APIs alongside idempotent transaction handling (Spring Boot + PostgreSQL + Redis) to reduce transaction disputes by 31%. For engagement and performance, I delivered AI-powered financial insights (AWS SageMaker inference + Lambda/API Gateway, with TensorFlow Lite fallback) and real-time streaming dashboards (WebSockets + GraphQL subscriptions via AWS AppSync + DynamoDB), cutting refresh latency by 38% and helping fraud analysts respond 28% faster.

Across my career, I’ve consistently improved reliability and developer velocity: standardized CI/CD pipelines to reduce release cycles from 21 days to 8 days, mentored five engineers across Android and iOS, and reduced production defect density by 22%. In healthcare and logistics, I’ve built HIPAA-compliant telehealth modules (50,000+ monthly sessions with a 1% connection failure rate), improved offline-first completion rates by 27%, lowered crash rates from 2.3% to 0.8%, and enabled stable device-state synchronization to reach 99.9% uptime.

Experience

Work history, roles, and key accomplishments

Current

Staff Mobile Engineer

Current

TechAhead

Jul 2025 - Present (10 months)

Architected a multi-module Android + iOS digital banking super app consolidating three legacy systems, reducing annual maintenance overhead by 24% and enabling successful PCI-DSS audit certification with zero high-risk remediation. Integrated financial services and built secure, real-time, cloud-backed features (transaction disputes -31%, MAU +19%, refresh latency -38%) while cutting release cycle

Kotlin Jetpack Compose SwiftUI GraphQL WebSockets AWS AppSync AWS Sagemaker CI CD (GitHub Actions Fastlane)

Senior Mobile Engineer

WillowTree

Jul 2023 - Jun 2025 (1 year 11 months)

Modernized an omni-channel retail commerce platform from XML/UIKit to Jetpack Compose and SwiftUI, increasing UI development velocity by 30%. Delivered measurable business impact across payments and commerce (checkout completion +15% for 500K+ users, cart conversion +12%), improved inventory synchronization (customer service tickets -18%), reduced cold-start latency by 38%, and maintained 99.9% en

Kotlin Jetpack Compose SwiftUI AWS AppSync DynamoDB Firebase Remote Config BigQuery Analytics Performance Optimization

Mobile Engineer

ArcTouch

Jun 2021 - Jun 2023 (2 years)

Architected a cross-platform smart-home control system integrating MQTT, BLE provisioning, AWS IoT Core device registry, and OTA firmware orchestration to onboard 100,000+ devices across North America. Strengthened device security with TLS and certificate pinning, increased daily active usage by 21%, achieved 99.9% device reliability, and reduced firmware-related support tickets by 23% through sta

Kotlin SwiftUI MQTT AWS IoT Core OTA Firmware Orchestration Combine

Mobile Software Engineer

Zco

Sep 2019 - May 2021 (1 year 8 months)

Developed Android (Kotlin) and iOS (Swift) warehouse scanning apps integrating Zebra SDK, RFID hardware, and barcode decoding across 12 distribution centers, improving scan-to-update latency by 31% and reducing reconciliation discrepancies by 22%. Built offline-first transaction logging with delta synchronization, migrated legacy Android Java to Kotlin to reduce crash frequency by 40%, and deliver

Kotlin Swift Zebra SDK RFID Hardware REST APIs Spring Boot Offline Sync (SQLite)Stripe Apple Pay Google Pay

Research Intern

Amazon

Jun 2019 - Aug 2019 (2 months)

Optimized mobile checkout performance for high-traffic scenarios by profiling network bottlenecks and refactoring client logic, implementing request batching and response caching to reduce checkout API round-trip latency by 17% (via A/B testing) and improving cart completion rates by 6%. Reduced memory leaks and improved crash-free sessions by 0.4% at scale while collaborating with senior engineer

Java Kotlin Swift Xcode Instruments A B Testing Performance Profiling DynamoDB API Gateway