I’m a product designer with over 3 years of experience in fintech and e-commerce. Originally from Taiwan, I’m now based in Tokyo, working in PayPay, a leading digital payment company.

I’m a product designer with over 3 years of experience in fintech and e-commerce. Originally from Taiwan, I’m now based in Tokyo, working in PayPay, a leading digital payment company.

I’m a product designer with over 3 years of experience in fintech and e-commerce. Originally from Taiwan, I’m now based in Tokyo, working in PayPay, a leading digital payment company.

Case Study

Case Study

PayPay

Fintech

APP

2024

Top Up Experience Redesign

Data-driven A/B testing boosted top-up amounts by 5% and increased GMV by 3%

Coming Soon

PayPay

Fintech

APP

2024

Top Up Experience Redesign

Data-driven A/B testing boosted top-up amounts by 5% and increased GMV by 3%

Coming Soon

PayPay

Fintech

APP

2024

Transit external credit cards payment

Transit users smoothly to the new ways to pay and promote in-house credit cards

Coming Soon

PayPay

Fintech

APP

2024

Transit external credit cards payment

Transit users smoothly to the new ways to pay and promote in-house credit cards

Coming Soon

From People I've Worked With

From People I've Worked With

Kazuya @AKQA/ Ex-PayPay

Kazuya @AKQA/ Ex-PayPay

Associate Design Director

Associate Design Director

Ryan was a key team member during my time at PayPay, consistently delivering high-quality designs on time while managing multiple projects. He effectively prioritized tasks, kept the team updated, and adapted his communication to different stakeholders, ensuring smooth project progress. Beyond his design work, Ryan contributed to our Design Ops group, optimizing the Design QA process and establishing accessibility checkpoints, which improved team efficiency and design usability.


Ryan’s professionalism, attention to detail, and proactive approach make him an invaluable team member who elevates the quality of both design and collaboration.



Ryan was a key team member during my time at PayPay, consistently delivering high-quality designs on time while managing multiple projects. He effectively prioritized tasks, kept the team updated, and adapted his communication to different stakeholders, ensuring smooth project progress. Beyond his design work, Ryan contributed to our Design Ops group, optimizing the Design QA process and establishing accessibility checkpoints, which improved team efficiency and design usability.


Ryan’s professionalism, attention to detail, and proactive approach make him an invaluable team member who elevates the quality of both design and collaboration.



Keith Oh @Carousell

Keith Oh @Carousell

Head of Product Design

Head of Product Design

Ryan was a valued member of my team who successfully managed several challenging projects independently during his time with us. These projects were particularly demanding due to initially unclear requirements, but Ryan conducted thorough research to bring clarity to the design briefs. He approached challenges with patience and a methodical mindset, analyzing issues effectively and proposing well-thought-out solutions.


Ryan’s communication skills were exceptional; he consistently collaborated with team members, including engineers, to understand diverse perspectives, ensure smooth project progress, and cultivate a positive, collaborative environment. His professionalism and strong sense of responsibility made him a dependable and trustworthy team member.

Ryan was a valued member of my team who successfully managed several challenging projects independently during his time with us. These projects were particularly demanding due to initially unclear requirements, but Ryan conducted thorough research to bring clarity to the design briefs. He approached challenges with patience and a methodical mindset, analyzing issues effectively and proposing well-thought-out solutions.


Ryan’s communication skills were exceptional; he consistently collaborated with team members, including engineers, to understand diverse perspectives, ensure smooth project progress, and cultivate a positive, collaborative environment. His professionalism and strong sense of responsibility made him a dependable and trustworthy team member.

Simon Lin @Canva

Simon Lin @Canva

Principal Product Designer

Principal Product Designer

Ryan is my team member at AAPD. He started as a teaching assistant for online courses and has grown into an instructor in the product design bootcamp. Over time, he’s gone from following instructions to independently leading projects, showing impressive learning skills, attention to detail, and great communication.


He’s especially good at working with stakeholders, keeping things on track while creating a positive and efficient vibe. Working with Ryan is always a pleasure—he’s someone you can count on.

Ryan is my team member at AAPD. He started as a teaching assistant for online courses and has grown into an instructor in the product design bootcamp. Over time, he’s gone from following instructions to independently leading projects, showing impressive learning skills, attention to detail, and great communication.


He’s especially good at working with stakeholders, keeping things on track while creating a positive and efficient vibe. Working with Ryan is always a pleasure—he’s someone you can count on.

Tom @PayPay

Tom @PayPay

QA Engineer Manager

QA Engineer Manager

Ryan is a product designer I worked with at PayPay on several QA projects. He demonstrated professionalism and attention to detail, from pixel-perfect checks to evaluating the overall process. When discrepancies between design and development arose, he calmly assessed the situation and worked with the team to find practical solutions, ensuring the final product maintained quality and consistency.


Additionally, Ryan actively contributed by suggesting bug fixes and optimizations, improving both the product and team efficiency. His focus on detail and commitment to quality make him a highly reliable team member. I’m confident his contributions will always elevate the design outcome.

Ryan is a product designer I worked with at PayPay on several QA projects. He demonstrated professionalism and attention to detail, from pixel-perfect checks to evaluating the overall process. When discrepancies between design and development arose, he calmly assessed the situation and worked with the team to find practical solutions, ensuring the final product maintained quality and consistency.


Additionally, Ryan actively contributed by suggesting bug fixes and optimizations, improving both the product and team efficiency. His focus on detail and commitment to quality make him a highly reliable team member. I’m confident his contributions will always elevate the design outcome.

Belissa @Carousell

Belissa @Carousell

Senior Product Designer

Senior Product Designer

Ryan was a former colleague at Carousell, and I was always impressed by his design approach. He balanced user experience with business goals, ensuring thoughtful, practical solutions even when compromises were needed. His designs seamlessly met both user and product needs.


Ryan’s collaborative spirit stood out—he often suggested pair design sessions, which helped prevent miscommunication and made problem-solving enjoyable. His dedication to growth was inspiring; he actively sought feedback in design reviews and consistently improved his work based on it. His openness, creativity, and positive energy made him an invaluable teammate.

Ryan was a former colleague at Carousell, and I was always impressed by his design approach. He balanced user experience with business goals, ensuring thoughtful, practical solutions even when compromises were needed. His designs seamlessly met both user and product needs.


Ryan’s collaborative spirit stood out—he often suggested pair design sessions, which helped prevent miscommunication and made problem-solving enjoyable. His dedication to growth was inspiring; he actively sought feedback in design reviews and consistently improved his work based on it. His openness, creativity, and positive energy made him an invaluable teammate.

ryanchyy@gmail.com

Copyright © 2025 by Chang Yu.

Made with love and Four Season Teas (30% sugar, less ice)

ryanchyy@gmail.com

Copyright © 2025 by Chang Yu.

Made with love and Four Season Teas (30% sugar, less ice)

ryanchyy@gmail.com

Copyright © 2025 by Chang Yu.

Made with love and Four Season Teas (30% sugar, less ice)

Top ↑

Case Study

PayPay

Fintech

APP

2024

Top Up Experience Redesign

Data-driven A/B testing boosted top-up amounts by 5% and increased GMV by 3%

Coming Soon

PayPay

Fintech

APP

2024

Top Up Experience Redesign

Data-driven A/B testing boosted top-up amounts by 5% and increased GMV by 3%

Coming Soon

PayPay

Fintech

APP

2024

Transit external credit cards payment

Transit users smoothly to the new ways to pay and promote in-house credit cards

Coming Soon

PayPay

Fintech

APP

2024

Transit external credit cards payment

Transit users smoothly to the new ways to pay and promote in-house credit cards

Coming Soon

From People I've Worked With

Kazuya @AKQA/ Ex-PayPay

Associate Design Director

Ryan was a key team member during my time at PayPay, consistently delivering high-quality designs on time while managing multiple projects. He effectively prioritized tasks, kept the team updated, and adapted his communication to different stakeholders, ensuring smooth project progress. Beyond his design work, Ryan contributed to our Design Ops group, optimizing the Design QA process and establishing accessibility checkpoints, which improved team efficiency and design usability.


Ryan’s professionalism, attention to detail, and proactive approach make him an invaluable team member who elevates the quality of both design and collaboration.



Keith Oh @Carousell

Head of Product Design

Ryan was a valued member of my team who successfully managed several challenging projects independently during his time with us. These projects were particularly demanding due to initially unclear requirements, but Ryan conducted thorough research to bring clarity to the design briefs. He approached challenges with patience and a methodical mindset, analyzing issues effectively and proposing well-thought-out solutions.


Ryan’s communication skills were exceptional; he consistently collaborated with team members, including engineers, to understand diverse perspectives, ensure smooth project progress, and cultivate a positive, collaborative environment. His professionalism and strong sense of responsibility made him a dependable and trustworthy team member.

Simon Lin @Canva

Principal Product Designer

Ryan is my team member at AAPD. He started as a teaching assistant for online courses and has grown into an instructor in the product design bootcamp. Over time, he’s gone from following instructions to independently leading projects, showing impressive learning skills, attention to detail, and great communication.


He’s especially good at working with stakeholders, keeping things on track while creating a positive and efficient vibe. Working with Ryan is always a pleasure—he’s someone you can count on.

Belissa @Carousell

Senior Product Designer

Ryan was a former colleague at Carousell, and I was always impressed by his design approach. He balanced user experience with business goals, ensuring thoughtful, practical solutions even when compromises were needed. His designs seamlessly met both user and product needs.


Ryan’s collaborative spirit stood out—he often suggested pair design sessions, which helped prevent miscommunication and made problem-solving enjoyable. His dedication to growth was inspiring; he actively sought feedback in design reviews and consistently improved his work based on it. His openness, creativity, and positive energy made him an invaluable teammate.

Tom @PayPay

QA Engineer Manager

Ryan is a product designer I worked with at PayPay on several QA projects. He demonstrated professionalism and attention to detail, from pixel-perfect checks to evaluating the overall process. When discrepancies between design and development arose, he calmly assessed the situation and worked with the team to find practical solutions, ensuring the final product maintained quality and consistency.


Additionally, Ryan actively contributed by suggesting bug fixes and optimizations, improving both the product and team efficiency. His focus on detail and commitment to quality make him a highly reliable team member. I’m confident his contributions will always elevate the design outcome.