Product Growth
Lifecycle and conversion work that connects user needs, pricing, onboarding, and post-launch measurement.
Fintech Product Engineer
Hello, my name is
Yudai Yaguchi
Product-minded Fintech Engineer
I build fintech products across growth, risk, money movement, and internal operations. My work sits between product thinking and production engineering: clarifying ambiguous problems, shipping reliable systems, and improving them after launch.
6+ yrslarge-scale fintech systems
Riskregulated workflows and monitoring
Productcustomer and internal tools
Atlas impact
Fintech work across product, risk, money movement, and operations.
The common thread is owning ambiguous fintech problems end-to-end: define the customer or operations pain, ship the system, monitor the rollout, and keep improving the numbers after launch.
- GrowthProduct initiatives across onboarding, conversion, retention, and lifecycle communication
- PlatformsInternal tools and workflows that help operations teams move with better visibility
- Core flowsWork spanning product UX, risk controls, money movement, support, and analytics
Risk and Reliability
Regulated workflows, monitoring, review tools, and operational controls for sensitive fintech surfaces.
Money Movement
Payment and transaction experiences designed with backend reliability, observability, and supportability in mind.
Operations Platforms
Internal workflows, support tooling, dashboards, and automations that make teams faster and safer.
Sensitive implementation details and private metrics are summarized at a high level here; the focus is scope, ownership, and engineering judgment.
Experience
Education
Featured Work
Selected projects that blend product thinking, clean code, and practical impact.
- All
- Web App
- Mobile
- AI/ML
- Console
Useful Tools
Production-ready utilities built to solve real-world day-to-day problems.
SettliSettlement Tool
Smart group payment settlement. Automatically finds the optimal transfer plan for complex bill splits.
Optimized SettlementWeighted SplitQR Share
KaimonoShopping List
Smart shopping lists with budgets, categories, sharing, and recurring item reminders.
Budget TrackingRecurring ItemsQR Share
KuizuQuiz Tool
Multiplayer quiz platform with 400+ questions, daily challenges, custom quizzes, and live scoreboards.
Multiplayer RoomsDaily ChallengesCustom Quizzes
MD PreviewMarkdown Viewer
Drag & drop or paste markdown files for instant full-screen preview with GitHub Flavored Markdown support.
Drag & DropClipboard PasteGFM Support
TodoAI Task Manager
Extract tasks from screenshots or text with AI. Manage your todo list with smart input.
Screenshot to tasksText extractionAI-powered
スコアトラッカーScore Tracker
麻雀の素点、ゴルフ、ボドゲ会など — 日付ごとの最終点を記録して累計を追跡。コードで友達と共有できます。
日次スコア記録累計の自動集計コード共有
Coming Soon...
More practical tools are on the way.
Interactive Games
Playable experiments focused on UX, performance, and game logic design.
Latest Blog
Notes on engineering, lessons learned, and ideas explored in public.
Coming soon...
Fintech Product Engineer
Yudai Yaguchi
Biography
Hi, I'm Yudai — a senior software engineer based in San Francisco with 6+ years building large-scale fintech systems. At Atlas and PayPal, I have owned product and platform work across growth, risk, payments, compliance, support operations, and internal tooling. I am strongest when the problem is cross-functional: turn unclear business goals into a shippable system, coordinate rollout details, instrument the results, and keep improving the customer and operations experience. Outside of work, I lead an AI meetup community for engineers and keep exploring how machine learning fits into everyday products. I'm pursuing an MS in Computer Science at Westcliff University while looking for the next role that blends deep engineering with product ownership.
- 27 years
- San Francisco, Remote
- uwyudai@gmail.com
- English, Japanese