Eduardo – Next.js, Typescript, React Native

An agentic commerce initiative enabling AI agents ("computer-using agents") to complete online checkout and payment on a user's behalf. The platform spans a React/Next.js merchant testbed, TypeScript SDKs and tooling libraries, Node GraphQL services, and a Java/Spring Boot backend — all integrated with major platform partners for agent-driven payment orchestration and risk signaling.

• Built end-to-end checkout flows enabling AI agents to complete purchases autonomously across front-end apps, TypeScript SDKs, GraphQL services, and a Java/Spring Boot backend.
• Developed a merchant testbed web app from scratch (Next.js/React/TypeScript) — cart, checkout, and payment-button integration with create-order/approval callbacks, server-side price validation, and multi-environment support — used to prototype and validate agent-driven checkout.
• Authored a reusable TypeScript client/tooling library with Playwright-based end-to-end tests that exercise the full agent checkout flow, adopted by other teams as the standard integration and E2E testing foundation.
• Implemented agent-aware payment routing and risk-signal handling across routing and orchestration services, and extended a backend order-lifecycle service to support new partner integration specs.
• Drove test reliability and coverage — built new functional and integration test suites for payment-authorization flows and fixed flaky agentic-checkout tests to ensure CI signal remains trustworthy.

A high-scale quick-service restaurant consumer app with 450K+ annual downloads, serving millions of users across the United States. The app handles the full ordering lifecycle — store discovery, menu browsing, customization, checkout, and loyalty — with deep integrations for authentication, attribution, and A/B testing.

• Led end-to-end delivery of the store discovery flow, redesigning the UX from prototype to production alongside product and design — collapsed a multi-step flow into a single-tap, location-first experience, cutting time-to-order by 50%.
• Architected end-to-end authentication and authorization (AWS Cognito, JWT, RBAC) for a consumer app with 450K+ annual downloads, reducing user drop-off at registration.
• Set up A/B testing infrastructure using Amplitude, establishing the team standard for rapid, data-driven iteration and driving 30% year-over-year growth.
• Mentored mid-level developers on React best practices, code review, and architecture patterns — participated in recruiting and interview loops, raising the team's craft bar and accelerating feature delivery.
• Debugged and fixed a silent deep link failure on iOS caused by an AppsFlyer SDK edge case — used Datadog telemetry to isolate the issue, shipped a workaround same day, then forked the SDK for a permanent fix with regression tests.

A 401(k) savings and retirement platform serving small businesses across the US.

• Led company-wide delivery of a component library (React + Storybook), establishing consistent, accessible UI standards adopted across all product teams — raising the craft bar and quality benchmarks org-wide.
• Engineered a reusable multi-step form engine with XState (state machines), eliminating repetitive state logic across the org and enabling product teams to spin up complex onboarding flows significantly faster.
• Drove a component migration initiative across the engineering org, guiding developers through adoption via lint-enforced deprecation warnings and hands-on examples — ensuring a smooth, risk-free transition.

A white-label web and mobile delivery platform serving 3 global quick-service restaurant brands across multiple international markets. Built on a shared codebase with brand-specific UX customization, cross-brand component reuse, and performance at scale.

• Built and migrated a customizable web delivery platform to React Native, serving 3 global brands across multiple markets — optimizing for performance, UX consistency, and cross-brand component reuse.
• Shipped scalable web applications with a focus on performance and cross-brand reusability across a global product portfolio.

An offline-first ERP platform for a large enterprise client operating in low-connectivity environments. The challenge was reliable data sync and caching so users could continue working without interruption when connectivity dropped.

Built an offline-first ERP platform for a large enterprise client using React, Node.js, and MySQL — delivering reliable sync and caching logic for users operating in low-connectivity environments.

Multiple ERPs build around medtech, telecom, and startups. Two full-stack platforms: a medical laboratory web platform handling multi-tenant workflows and real-time result notifications, and a white-label gym management app with class scheduling, subscriptions, and concurrent spot reservations.

• Built a full-stack web platform for a medical laboratory using React, NestJS, PostgreSQL, and TypeORM — designing the data model, complex queries, and role-based access policies for multi-tenant workflows, with Firebase-powered real-time result notifications and end-to-end test coverage using Jest.
• Developed a white-label gym management app in React Native with class scheduling and subscription features — using MongoDB atomic operations and Firebase real-time sync to guarantee spot reservation integrity under concurrent load.