01
Gasolytics
Data platform · 2026
Problem. U.S. fuel-price data is noisy, scattered, and hard to explore.
Built. Daily AAA pipeline with server-rendered D3 maps, state trends, affordability, and trip cost.
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Independent developer · Engineer · Product builder
I build useful software from messy systems.
I build realtime voice tools, public-data products, and the systems that keep them dependable.
B.S. Computer Science — University of Maryland
01 / 04
SoloMock
Practicing interviews alone lacks realism and structure.
WebSocket audio streaming with transcript, code capture, and a Socratic AI interviewer.
View case studyShowing SoloMock
01 / Work
Selected work
02
SoloMock
Developer tool · 2025
Problem. Practicing interviews alone lacks realism and structure.
Built. WebSocket audio streaming with transcript, code capture, and a Socratic AI interviewer.
View project03
SoloYap
Voice tutor · 2025
Problem. Speaking practice without feedback is slow and unstructured.
Built. Realtime voice practice with instant corrections, guided scenarios, and CEFR-graded difficulty.
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04
Throughline
Learning platform · 2026
Problem. Engineers jump between tutorials without a coherent path.
Built. A five-act learning system that connects guides, hands-on building, interview prep, and practice.
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02 / About
Who I am / How I work.
Who I am
I’m To Yin Yu, an independent software developer who takes products from idea to production.
I move between product, frontend, backend, deployment, and the production details that make software dependable.
2024—Now Independent software developer
2022 B.S. CS, University of Maryland
How I work
- 01
Own the whole path
Take projects from messy inputs to reliable systems I can stand behind.
- 02
Design the failure states
Anticipate what breaks and build the behavior before it happens.
- 03
Start with the user’s task
Focus on the job to be done, then remove everything that gets in the way.