CAIO STATO
PTEN
Frontend EngineerAvailable for new projects

React and Next.js architecture that holds up under load

Four years on fintech platforms and digital products, spent on render cost, bundle size, and code that survives the next engineer.

See the work
Years shipping frontend
4+
Operational efficiency gain
30%
System reliability
99.9%

Selected projects

Two projects where the frontend work had a number attached to it.

  1. Cerasos sales platform
    99.9%System reliability

    Fullstack Engineer · 2025

    Private work

    Cerasos sales platform

    Pharmacy sales platform that runs on WhatsApp. Customers message, the Uazapi integration answers and creates the order, and Getnet handles payment from tokenization through the webhook that confirms it. An admin dashboard sits on top for order tracking, sales figures, and customer ratings.

    System reliability
    99.9%
    Orders automated
    100%
    • Next.js
    • TypeScript
    • Getnet
    • Uazapi
  2. AR3 Capital financial platform
    +30%Operational efficiency

    Frontend Engineer · 2022 - 2024

    Private work

    AR3 Capital financial platform

    Internal financial services pulled into one client. Database lookups and reporting were the slow part, so those came first. The UI library shipped through Storybook so every view drew from the same components.

    Operational efficiency
    +30%
    Views on the UI library
    100%
    • React
    • Storybook
    • TypeScript
    • REST APIs

Experience

  1. Cerasos

    Fullstack Engineer

    Dec 2025 - Present

    • Built a pharmacy sales platform on top of WhatsApp through Uazapi, so a customer message turns into a real order without anyone typing it in.
    • Wrote the payment engine in Next.js and TypeScript against the Getnet API: tokenization, a custom checkout, and webhook listeners that keep order status in sync.
    • Built the admin dashboard for orders, sales figures, and customer ratings, which replaced the spreadsheets the pharmacy was using.
    • Own the infrastructure too, including hosting, database sync, API orchestration, and the test suite that keeps reliability at 99.9%.
    • Next.js
    • TypeScript
    • Getnet
    • Uazapi

  2. Ziion Tech

    Frontend Engineer

    Feb 2025 - Present

    • Built a property showcase app in Next.js and Tailwind CSS, with Core Web Vitals as the thing we optimized against rather than a report we read afterwards.
    • Put together the internal UI component library, which cut roughly 20% off the time it takes to ship a new feature.
    • Built the admin dashboard for employee management and the internal data views that go with it.
    • Set up the Jest workflows so unit tests run without anyone remembering to run them.
    • Next.js
    • TypeScript
    • Tailwind CSS
    • Jest

  3. eAcademy

    Frontend Engineer

    Jun 2024 - Nov 2024

    • Built the scheduling and calendar views in Next.js and Shadcn UI.
    • Built the data dashboards with Redux and Framer Motion, working with the backend team to pin down the API contracts first.
    • Moved the frontend test suite into the CI/CD pipeline, which took manual verification out of the release path.
    • Reviewed code and wrote the documentation that kept the architecture decisions from getting lost.
    • Next.js
    • Redux
    • Shadcn UI
    • Framer Motion

  4. AR3 Capital

    Frontend Engineer

    Oct 2022 - Feb 2024

    • Led the client-side work to bring internal financial services into one platform.
    • Rewrote the database lookups and reporting engines, which moved operational efficiency up 30%.
    • Built and published the company UI library through Storybook, and every view ended up on it.
    • Owned the frontend end to end and worked directly with the product squads.
    • React
    • Storybook
    • TypeScript
    • REST APIs

  5. RN3

    Software Engineer (Full Stack)

    Apr 2023 - Oct 2023

    • Migrated the legacy data modules off Angular onto Next.js and Node.js.
    • Built the Stripe payment integration and the business analytics features around it.
    • Rewrote the slow PostgreSQL queries, which got data retrieval 25% faster.
    • Embedded Power BI dashboards so the reporting stopped going through a separate processing step.
    • Next.js
    • Node.js
    • PostgreSQL
    • Stripe

  6. Hybank

    Mobile Developer

    Sep 2021 - Sep 2022

    • Built cross-platform fintech apps in React Native for iOS and Android.
    • Designed the mobile design system, which cut the layout work on every screen after it.
    • Managed the Redux state tree connecting the app to transaction-heavy banking REST APIs.
    • Ran device usability and performance testing, which brought production errors down and app store stability up.
    • React Native
    • Redux
    • REST APIs

What I do

  • Frontend engineering

    React and Next.js applications built to stay fast as they grow. Core Web Vitals and accessibility get measured, not assumed.

  • Payments and fintech

    Stripe and Getnet integrations from sandbox through production, including tokenization, webhooks, and PCI-compliant checkout.

  • Design systems and architecture

    Component libraries in Storybook, with Clean Architecture and DDD applied where the domain is complex enough to need them.

Stack

  • TypeScript
  • React
  • Next.js
  • React Native
  • Redux Toolkit
  • Zustand
  • Tailwind CSS
  • Shadcn UI
  • Node.js
  • PostgreSQL
  • GraphQL
  • Stripe
  • Getnet
  • Uazapi
  • Storybook
  • Jest
  • Playwright
  • Docker
  • Vercel
How I work
“Clean Architecture and DDD are not academic exercises. They are what lets a team keep shipping without the codebase turning against them. Performance and accessibility follow from structure. You do not bolt them on at the end.”

Let's talk

Open to new opportunities. Send a question, or just say hi, and I will get back to you.

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