My story

I'm Yuji, a senior software engineer based in Reading, UK.

Yuji Nelson

From watching my dad work on computers when I was a kid, I cultivated a passion and curiosity for technology which led me to teach myself how to code in middle school. Though I ended up studying Business Information Systems, I wanted to use my coding skills to build products and found my niche in front-end development.

Starting out

I started my career at Boeing as a web developer and was given the opportunity to redesign an enterprise website on mobile communications. Through this project, I updated the front-end framework and rebuilt the user interface to help employees locate and consume critical content. While the overhaul led to increased user engagement and fewer help desk calls, the biggest impact for me was on a personal level. It showed me the power of understanding the user and how employing thoughtful design and well-written code could solve real needs.

Since then, I've continued building products across fintech, travel, and e-commerce, partnering with Product, Design, and Data in cross-functional teams. I've led initiatives, shaped cross-team architectures, and worked across the stack to solve complex product problems. Outside of work, I use side projects to sharpen my skills, experiment with new technologies and ideas, and explore different parts of the product-building process. Recently, I've been building Sanbi as a chance to work full-stack, wear many hats, and have fun building a user-tested solution to a problem a friend brought to me.

At the end of the day

While I love what I do, I know life is more than just work, and I make time to relax and recharge. Outside of work, you can find me working through a never-ending collection of photos waiting to be edited, playing golf, supporting LFC (YNWA), try-harding at board games with friends, listening to a sci-fi or action audiobook, or occasionally DJing a wedding.

Contact me

My most recent role

Jun 2024 - Jun 2026
in London, UK
Senior Software Engineer, Front-end
Cleo/ Earned Wage Access Core Squad

Led front-end architecture for Cleo’s React Native Earned Wage Access experience, simplifying complex client-side flows through backend-driven states and shipping A/B-tested disbursement improvements across more than two million users.

  • Ensured 100% UI parity across US/UK markets by leading the React Native rebuild of the Earned Wage Access flow; simplified deeply nested, 10-outcome hooks into a backend-driven state architecture, reducing component complexity to 1-3 predictable outcomes.
  • Feature-led Earned Wage Access disbursement flow improvements across a 2M+ user A/B test population, recovering delayed delivery, catching a launch-blocking card-linking regression before release, and investigating support-contact issues using Count dashboards and Intercom transcripts.
  • Authored the front-end chapter’s Redux Saga to TanStack Query migration playbook, later adopted by Front-End Platform as the guide for a wider migration away from legacy data-fetching patterns.
  • Led a same-day production hotfix for an Earned Wage Access reload incident, diagnosing the issue as an API contract/type-boundary problem, shipping a minimal fix, then following up with a Rails/TypeSpec enum change that caught a missing UK payment-rail value within 24 hours.
  • Submitted 580+ code reviews across the engineering organisation, becoming a trusted reviewer for complex React Native, TypeScript, Redux Saga, and API-boundary changes.
See resume

Skills

Frontend
  • TypeScript
  • React
  • React Native
  • Next.js
  • TanStack Query (React Query)
  • Redux / Redux Saga
  • React Testing Library
  • Jest
  • shadcn/ui
  • Storybook
  • HTML
  • Tailwind CSS
  • CSS
APIs & Backend
  • GraphQL
  • Node.js
  • tRPC
  • TypeSpec/OpenAPI
  • PostgreSQL
  • Drizzle ORM
Product Engineering
  • Feature leadership
  • Cross-functional collaboration
  • Technical discovery & planning
  • A/B testing
  • Session replay
  • Customer feedback analysis
  • Figma/prototyping
Engineering Quality
  • Thorough code review
  • Automated testing & quality practices
  • Technical documentation
AI-Assisted Engineering
  • Claude Code
  • Codex
  • Cursor
  • Conductor
  • AI code review workflows (CodeRabbit, Greptile)
  • Agent skills & workflows
See resume

Let's work together

Have an opportunity for me, or questions about my work and skills? Let's chat!

Get in touch