Hi 👋
I’m In Hei Lei, and I go by Joshua. I study mechanical engineering and finance at the University of Sydney. Alongside my studies, I’m building Breeze and Roomtemp°. You’ll find both here, along with a selection of my other projects.
Projects 🛠️
Roomtemp°
Jun 2026–Present · Founder and creative director
- Led a three-person team developing Lumi in 2025. Designed the two-part out-of-bed alarm’s enclosure in SolidWorks and built and tested 5–6 3D-printed prototypes.
- Created CAD layouts for a lamp’s internal components, including its motor, circuit board, speakers and battery.
- Designed the brand identity, product interfaces and storefront, and coordinated suppliers and marketing for Roomtemp’s physical products and curated MUYU figures.
Breeze
Oct 2025–Present · Founder and creative director
- Built and released an iOS breathing and journaling app using React Native, Expo and Supabase.
- Designed the app interface and visual identity, tested its core features, and created the website and short-form marketing content.
- Recruited 10 beta users to test the app.
- Co-founded an AI workshop studio.
- Developed the studio’s brand positioning, visual identity, logo and colour system, and designed its website.
PostMyNote
Jul–Oct 2025 · Co-founder
- Worked with a team that secured clients in basketball, wine and dentistry, created carousel posts and helped grow their Instagram accounts.
- The team held client meetings and built the website and an automated carousel-generation system.
Website
NestModel
Jul–Oct 2025 · Co-founder
- Co-founded an e-commerce business offering physical 3D floor-plan models to real estate businesses.
- Designed the brand identity and client-facing materials.
- Conducted door-to-door outreach in New York City and ran email, paid social media and short-form content campaigns.
Zenta Group
Jun–Aug 2024 · Software engineering intern
- Built multi-agent chatbots with LangChain and OpenAI to automate conversational workflows.
- Built responsive interfaces in Next.js, Framer and Spline and connected them to backend AI services.
- Refined AI prompts to improve response quality and responsiveness.
- Co-founded and launched a platform for booking services using Vue.js, Vite and Firebase.
- Adapted the app for iOS and Android using Ionic.
- Designed the brand identity and app interface, and coordinated material sourcing.
Piezoelectric tile research
2021–2022
- Conducted epoxy resin experiments for piezoelectric tile research with the University of Macau.
English public speaking team
2021–2022
- Represented the school at the Macau Youth English Speaking Contest.
- Organised and promoted the annual English Day and fair.
Elderly home robot
2020–2022
- Trained a fall-detection model in Python and built a human-following system for an autonomous care robot.
- Integrated YOLO, ROS, SLAM and AMCL for recognition, localisation and indoor navigation.
- Led the team to first place in the RoboCup@Home Education Online Challenge in 2020 (high school) and 2021 (university). The team also won awards at ISEF Macau, KSEF and CTM Macau.
- Led development of an autonomous flood-rescue boat with a graphical interface for route planning.
- Implemented person detection, PID control and ultrasonic obstacle avoidance for real-time navigation.
- The team won awards at China Adolescents Science & Technology Innovation Contest and the Beijing Science Fair.
HYPED Hyperloop design team
2018–2019
- Built a ticket-booking system using JavaScript, PHP and MySQL.
- Worked with 14 other students from different schools to produce a hyperloop MVP and project proposal.
ROV and AUV team
2018–2019
- Built an underwater shape-recognition system using OpenCV.
- Designed a PID controller in C++ for an autonomous underwater vehicle.
- Led a 12-person team across software, mechanical design and communications, coordinating tasks and timelines.
- Designed robot components in CAD and fabricated parts using 3D printing, laser cutting and lathe machining.
- Organised STEM outreach with local schools and introduced younger students to robotics competitions.
Solar flare research
2017–2018
- Analysed NASA MESSENGER solar-flare data with Macau University of Science and Technology.
- Used CHIANTI spectral analysis to estimate elemental abundances from more than 500 observed solar flares.