Leo Zhang

Software Developer

Vancouver, British Columbia

• Developed production Ticket Vending Machine (TVM) software using Kotlin, Java, and Jetpack Compose, applying Clean Architecture, Domain-Driven Design, and MVVM.
• Architected and implemented Android application flows across repositories, use cases, ViewModels, and Compose views, improving separation of concerns and enabling isolated testing of business logic.
• Refactored a 3,000+ line state manager from deeply nested conditional logic into a hierarchical finite-state machine (FSM), isolating operation-mode transitions and simplifying feature development and maintenance.
• Implemented maintenance-mode UI/UX using Jetpack Compose and Material 3, providing intuitive guided workflows for TVM servicing and configuration.
• Automated TVM firmware flashing by replacing an error-prone manual procedure with a guided installation wizard, integrating software workflows with device deployment.
• Configured Hilt/Dagger2 dependency injection and mocked hardware interfaces to enable automated testing of application logic without requiring physical TVM hardware.

Software Developer

Vancouver, British Columbia

• Develop software in C++ and Python for autonomous soccer-playing robots competing in the RoboCup Small Size League.
• Refactored Protobuf-over-UDP networking to share a Boost.Asio io context and worker thread across senders and listeners, eliminating per-socket threads and centralizing asynchronous I/O management.
• Implemented lifetime-safe asynchronous receive handling and synchronized socket shutdown. Created 8 regression tests covering concurrent closure, callback completion, port release, and shared-context isolation.
• Developing HAL for ESP32 power-board firmware in C++ to enable stateful testing for the board that controls kicking and chipping, PWM dribbler control, capacitor charging, and battery/current monitoring.

Undergraduate Teaching Assistant

• Taught Derivative Calculus, Integral Calculus, and Introduction to Computation in Engineering (C, C++, Python), receiving over 90% positive ratings in student surveys.
• Guided students in large (∼300 students) and small (∼50 students) classes by answering questions and reinforcing concepts.
• Provided detailed feedback on coding lab submissions and math assignments to help students identify areas for improvement.

Filament Recycler and Web Dev Sub-Team Member

• Refactored JavaScript code to improve readability and enable easier feature implementation.
• Enhanced website mobile experience by adding side-scrolling functionality for pages with multiple images.
• Designed safety procedures for the electrical team handling >120V AC power and created PCB guidelines for UV resin printing.
• Created wiring diagrams and parts lists for the PID temperature control of a filament recycler extruder.