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Plínio Helpa

@plniohelpa

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Frontend Architect at R2 Capital who shipped an AI-powered lending chatbot and cut startup time by 66%.

Brazil

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At R2 Capital, I shipped an AI-powered conversational lending feature that lets merchants take financing through an LLM chatbot. I designed the tool layer and system prompt that guide the conversation from offer to disbursement.

I also built a company-wide frontend observability platform at R2 Capital, tracking Core Web Vitals across React and Next.js apps. With Uber engineering, I investigated performance and cut application startup time by 66%.

At dLocal, I led the migration of more than 10 customer-facing legacy PHP apps to React, Next.js, and TypeScript. I also automated the build and deployment pipeline with GitHub Actions on AWS.

At Eduzz, I architected the Houston Design System from scratch, and it became the UI standard across product teams. I also led Blinket’s ticket creation redesign, which reached 95%+ user preference after launch.

Experience

Work history, roles, and key accomplishments

Current

Frontend Architect

Current

R2 Capital

Aug 2025 - Present (1 year 1 month)

Built an AI-powered conversational lending feature, designing the LLM's tool layer and system prompt. Led performance investigations with Uber engineering, cutting application startup time by 66% through bundle optimization, HTTP/3 adoption, and parallel asset loading.

React TypeScript LLM Integrations Tool Function Calling Prompt Design Core Web Vitals Datadog New Relic Grafana Jest React Testing Library GitHub Actions CI CD

Senior Frontend Developer

dLocal

Oct 2023 - Aug 2025 (1 year 10 months)

Led migration of 10+ customer-facing legacy PHP apps to React, Next.js, and TypeScript, modernizing critical payment workflows. Automated build and deployment pipeline with GitHub Actions on AWS, saving ~10 hours per release cycle.

React Next.js TypeScript REST APIs GitHub Actions AWS CI CD

Senior Frontend Developer

Eduzz

May 2022 - Oct 2023 (1 year 5 months)

Architected Eduzz's company-wide open-source React design system from scratch, adopted as UI standard across all product teams. Led end-to-end redesign of ticket creation experience, reaching 95%+ user preference after launch.

React TypeScript styled components Design Systems Component Libraries Usability Testing

Full Stack Developer

Eduzz

Jan 2019 - May 2022 (3 years 4 months)

Owned frontend architecture and delivery of the BackOffice platform, replacing Webpack with Vite and leading migration to functional React and TypeScript. Mentored trainees in React and TypeScript.

React Redux TypeScript NodeJS AWS Vite Webpack JavaScript