Full Stack & Android Software Developer

SUNG HYUN BACK

F U L L - STACK & A NDROID S O F TWARE D E V E LOPER

*************@*****.*** 437-***-**** 2815 - 80 Harrison Garden Blvd, Toronto, ON linkedin.com/in/sunghyun8602 P ROFESSIONAL S UMMARY

Full-Stack & Android Software Developer with strong experience building scalable backend systems, modern web applications, and high-quality mobile experiences. Skilled in developing robust server-side services using Java, Spring Boot, REST APIs, PostgreSQL, and cloud technologies, as well as creating responsive frontend interfaces with React and TypeScript. Brings additional expertise in modern Android development with Kotlin, Jetpack Compose, and performance-focused architecture. Committed to clean architecture, maintainable code, and thoughtful engineering practices across web, backend, and mobile development.

S K I L L S & E X P E RTISE

Frontend: React TypeScript JavaScript HTML CSS REST APIs Backend: Java Spring Boot Microservices PostgreSQL MongoDB SQL RabbitMQ Cloud & DevOps: AWS (Lambda, SQS, SNS) Docker CI/CD (Azure DevOps, Jenkins) GitHub Android: Kotlin Android SDK Coroutines Jetpack Compose Retrofit Dagger Firebase P ROFESSIONAL E X P E R I E NCE

Software Engineer – Backend (Java, Spring Boot)

HP, Kitchener

June 2023 – Present

Built and optimized Device Settings Management backend services for HP Workforce Experience using Java, Spring Boot, and REST APIs

Developed asynchronous event-driven pipelines with AWS and RabbitMQ to support high-volume workloads

Improved data performance by designing indexes, optimizing MongoDB queries, and managing schema migrations

Increased reliability through automated unit, integration, and API tests (JUnit, Mockito)

Designed and maintained CI/CD pipelines in Azure DevOps, automating build, test, and deployment workflows Android Software Developer

HP, Kitchener

April 2021 – Present

Developed and maintained the Android SDK powering HP Smart (100M+ downloads) and HP Roam (50K+ downloads)

Reduced crash rates from 25% to 7% through targeted debugging, refactoring, and library improvements

Built core SDK features using Kotlin, Coroutines, Dagger, Retrofit, WorkManager, Bluetooth, and Android system components

Collaborated with backend teams to optimize large-scale REST API interactions SUNG HYUN BACK 437-***-**** *************@*****.***

Managed CI/CD pipelines and SDK releases via Azure DevOps, GitHub, and Nexus

Authored Kotlin API documentation and developer guides for internal and external teams Intermediate Android Developer

Mapsted, Mississauga

January 2020 – April 2021

Contributed to indoor navigation and location-intelligence SDKs deployed across malls, campuses, and museums

Built Android features using Java, Retrofit, and system components (Services, BroadcastReceiver, Notifications)

Maintained multiple Android SDK libraries, improving stability and performance Full-Stack Software Engineer (Android + Backend)

The ARIES Inc., Toronto

February 2019 – April 2021

Developed an Android-based POS system sold on Amazon and Costco Canada, achieving a Top-5 ranking in Amazon.ca’s POS category

Built MVVM architecture, UI layouts, and core POS features using Kotlin, Coroutines, Dagger, and Android components

Improved release stability with unit and instrumented tests (JUnit, Robolectric) Full-Stack Software Engineer (Android + Backend)

HEXA Electronics, North York

March 2016 – February 2019

Built Android applications for a food-ordering platform deployed across restaurants, hotels, and resorts

Implemented real-time communication features using Java, TCP/IP, BroadcastReceiver, and Bluetooth

Designed UI layouts and structured data payloads for consistent multi-module behavior P ROJECTS

Dining-QR Ordering System

React TypeScript Java Spring Boot PostgreSQL Built a full-stack Dining-QR ordering system with real-time menu updates, order tracking, and role-based admin dashboards. Developed Spring Boot and PostgreSQL REST APIs for authentication, menu management, order workflows, and analytics. Android Apps & SDK Libraries

Kotlin Jetpack Compose Retrofit Coroutines

Developed multiple open-source Android SDK libraries, including a carousel/slider UI component and a Bluetooth communication module, along with sample apps for integration. Built modular, reusable components using Kotlin and Jetpack Compose, enabling Android developers to quickly add UI and Bluetooth features to their applications. E DUCATION

Bachelor of Science (BSc), Ordinary Science York University June 2017 Field of Study: Software Engineering, Computer Science, Applied Mathematics

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