Walter Lam - Senior Mobile Developer

Walter Lam

4.9

Select me!

Walter is available for hire

Hire Now

Walter Lam

4.9

Gender

Male

Address

Ho Chi Minh, Viet Nam

Main expertise

Flutter Mobile App Android Android SDK CI/CD DevOps Firebase Full-stack Java Kotlin Python Bluetooth

Introduction

Walter Lam is a highly motivated Senior Mobile Developer with over 5 years of experience in designing and implementing user-centric mobile applications. He has a proven track record in developing both native Android applications using Java/Kotlin and cross-platform applications using Flutter for mobile, desktop, and web. Walter has a solid understanding of Object-Oriented Programming methodologies, SOLID principles, and design patterns. He is experienced in setting up CI/CD pipelines using GitHub Actions for both mobile and desktop applications. Walter is well-versed in Agile and Scrum development methodologies and possesses strong UI/UX design principles with a passion for delivering exceptional user experiences. He continuously expands his skill set through ongoing learning of new technologies, best practices, and language proficiency.

Project list

Cross-Platform Point of Sale System - Vietnam

A comprehensive POS system designed for seamless operation on both mobile devices and Windows platforms, incorporating efficient CI/CD pipelines and automated update mechanisms.

Built a modular codebase foundation for cross-platform development (Mobile & Windows). Implemented CI/CD pipelines using GitHub or GitLab for automated builds and deployments, reducing the time to build mobile and desktop apps by 80% compared to manual processes. Developed a silent update mechanism for the Windows application, addressing the need for automatic updates for non-tech users. Created a printer module for receipt printing via WiFi and USB connections.

Technologies: Flutter, Clean Architecture, MVVM, Inno Setup 6.0, Python 3

Social Networking Video Editor App - Vietnam

Led the development of a state-of-the-art video editing application tailored for social networking. Key responsibilities included the implementation of advanced camera functionalities, resulting in decreased RAM consumption by 60%, thereby enhancing performance on low-end devices. Developed a comprehensive tracking module that integrates data seamlessly from multiple third-party providers to troubleshoot device-specific issues effectively. Took initiative in mentoring junior developers by providing detailed code reviews and guidance.

Led the development of the core application structure and implemented key features. Integrated advanced camera functionalities through thorough research and implementation. Optimized the editor codebase through refactoring, achieving a 60% reduction in RAM consumption. This significantly improved performance and minimized lag and crashes on low-end devices. Developed a unified tracking module capable of seamlessly integrating diverse tracking data from various third-party providers. This comprehensive solution facilitates the pinpointing of application issues specific to individual device models. Provided code review and mentorship to junior developers, fostering their growth and development.

Technologies: Flutter, ffmpeg, Dependency Injection with get_it, Bloc, Provider

AI Face Swap Application - Vietnam

An innovative mobile application designed to seamlessly swap faces in photos and videos, incorporating advanced features for a user-friendly experience.

Architected and implemented a clean and maintainable modular structure, promoting long-term code health and scalability. Successfully integrated in-app purchase functionalities across both Android and iOS platforms, enabling seamless monetization. Developed robust backend logic for in-app purchase verification and secure storage within Cloud Firestore.

Technologies: Flutter, In-app Purchase, Backend with Dartfrog, Globe for Server Deployment

Real Estate Application Development Project

A project focused on developing a comprehensive and seamless real estate application that integrates new innovative features, ensuring enhanced functionality and user experience.

Effectively collaborated with team members and business analysts to ensure seamless development and integration. Enhanced application functionality through the implementation of innovative features. Delivered high-quality results by rigorously testing new features and resolving identified bugs.

Technologies: Flutter, Dependency Injection with get_it, Bloc, Provider

Employee Benefit Care Mobile Platform

A project focused on enhancing employee benefit accessibility by transitioning from a web-based to a mobile-friendly platform.

Spearheaded the successful migration of the application from a web platform to a mobile platform, expanding user reach and accessibility. Collaborated with colleagues to optimize application performance, ensuring a smooth user experience.

Technologies: Flutter, Dependency Injection with get_it, Bloc, Provider

Order Delivery System Development - Vietnam

The project involved laying the groundwork for the entire order delivery application by creating the core codebase. Key activities included mentoring new developers to foster team growth, optimizing the development process to decrease time and costs by 30%, and ensuring high code quality through review and integration of team members' contributions.

Established the foundation of the application through the development of the core codebase. Empowered team growth by providing mentorship and training to new developers. Streamlined the development process, achieving a 30% reduction in application development time and costs. Maintained code quality and collaboration by reviewing and integrating code contributions from team members.

Technologies: Flutter, MVVM, Provider, Python

E-Commerce with POS Integration Project - Vietnam

Cultivated a continuous improvement culture by collaborating with team members to enhance application functionality and user interface based on user requirements. Developed and implemented innovative features to meet evolving client needs, ensuring a competitive advantage. Maintained high-quality applications through detailed maintenance, thorough testing, and proactive bug resolution. Managed successful deployments on Paxstore and Google Play to ensure seamless application distribution.

Foster a culture of continuous improvement by collaborating with colleagues to enhance application functionality and user interface based on user needs. Developed and implemented innovative features to address evolving client requirements and maintain a competitive edge. Delivered high-quality applications through meticulous maintenance, rigorous testing, and proactive bug resolution. Ensured successful application distribution by managing deployments on Paxstore and Google Play.

Technologies: Java, Kotlin, MVVM, Pushy service, Ultrasound (Chirp.IO), NFC, POSLink SDK, Fingerprint

Point of Sale (POS) Device Integration Project - Vietnam

Developed and integrated functionalities for POS devices, focusing on hardware connectivity and secure communication.

Developed functionalities for POS device integration, including bill acceptor connectivity. Implemented real-time data processing by efficiently converting base64 encoded signals into actionable data. Established secure Bluetooth communication protocols for reliable data exchange between POS devices.

Technologies: Java, MVP, Retrofit, RxJava, POSLink SDK, Bluetooth

Project list

Education

Expertise