The FNPTT (FirstNet Push-to-Talk) is a mobile app for first responders' communication. It lost users due to usability challenges that hindered life-saving missions. To regain responders' trust, the app was redesigned. I led the team in refactoring the push-to-talk screen, enhancing map information, and removing redundant interactions. This help responders communicate more efficiently, focus better on rescue, and improve situational awareness. Eventually, the new design contributed to a 76% reduction in the time spent on life-saving efforts.

Samsung Wallet aims to stand out in the competitive market and win more customers. Through research, I found that consumers use various coupons, memberships, and credit card rewards to optimize payment strategies, but the complexity of choices makes this challenging. I proposed leveraging AI to analyze customer data and provide the customer with the best payment strategies tailored to different situations, maximizing benefits for customers.

As a consulting firm, our company developed and managed products for clients and handled numerous credentials on the behalf. Initially, we tracked these credentials using a shared document, but as our business grew, this method became unsustainable and raised security concerns due to credentials being out-of-sync. To address this, we developed Pass Wizard, a secure credential management web app for storing credentials. I was responsible for defining the MVP features, designing the user experience, and delivering the mockup. The pre-release version was launched in November 2021, the time that people locate needed credential was reduced by 98%. Also, incorrect credential sharing or use due to typos was eliminated.

Click it Audio is a web app that enables our clients to upload or use text-to-speech to generate audio, and then encoded into a QR code for their business. This app helps clients promote products through audio format while enhancing accessibility. To increase client engagement and attract more users, I rebranded the product and redesigned the audio generation and QR code customization features. As a result, client satisfaction with the product has doubled, and sales of the standard plan increased by 3% within 4 months.