Ryugo Kubota
/
System Status: Active

Works

Company names withheld for confidentiality — roles and outcomes only.

  1. Energy management platform

    Lead Full-Stack Engineer

    Led a consumer / utility visualization app (mobile + web admin) from requirements through UI/UX and implementation; sharply improved render speed.

    React NativeTypeScriptNest.jsGraphQLRubyStripe
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  2. Real-time matching app

    Lead Frontend / Full-Stack

    Owned UX and performance for a cross-platform app; cut bundle size, analyzed drop-off funnels, and added Sentry-based error tracking.

    React NativeTypeScriptNest.jsGraphQLRedux ToolkitSentry
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  3. Seminar booking & payments

    Personal project (solo)

    Built a full-stack booking, payment, and DB system solo — Stripe checkout, QR check-in, and Supabase + Prisma data modeling.

    TypeScriptNext.jsTailwind CSSPrismaSupabaseStripe
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  4. Security-operations web app

    Lead Frontend (PL)

    Led the UI of a web app streamlining operations between security staff and contractors; implemented Figma designs with MUI and integrated Go / Python backends.

    TypeScriptReactNext.jsMUIGoPython
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  5. Voice-response (IVR) SaaS

    Lead Frontend & Backend

    Built admin panels and user dashboards for a nationwide IVR SaaS; shipped reusable UI and optimized Rails / Go APIs.

    TypeScriptReactGatsbyRuby on RailsGoAWS
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  6. Real-estate data pipeline

    Backend / Infrastructure

    Designed a resilient Node.js scraping engine with a fault-tolerant, resumable pipeline and serverless cron (EventBridge + Lambda).

    Node.jsAWS LambdaEventBridgeGoDockerMySQL
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  7. Job-search site

    Lead Frontend (PL)

    Built the frontend of a job-search site with rich location-based search; drove refactoring and code review.

    TypeScriptReactRuby on RailsSCSSAWS
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  8. Daycare-search service

    Frontend Engineer

    Built the frontend (view layer) of a daycare-search application, composing libraries to assemble the UI.

    Ruby on RailsJavaScriptSCSSPythonGo
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  9. Conversational chat form

    Frontend Engineer

    Built a bot-style conversational chat form in Next.js, with dynamically changing inputs and animated steps.

    Next.jsTypeScriptSCSS
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  10. High-traffic real-estate marketplace

    Frontend Engineer

    Audited architecture, cut bundles, and reworked rendering to raise the Lighthouse performance score from ~30 to 80+.

    TypeScriptReactNext.jsGraphQLRuby on RailsSCSS
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  11. Education-service landing page

    Frontend Coder

    Coded an education-service landing page to spec from Figma designs.

    HTMLSCSSPython
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