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ecancino/README.md

EDUARDO CANCINO ZARATE

LinkedIn GitHub

PROFESSIONAL SUMMARY

Staff-level Full-Stack Engineer with 20+ years delivering high-scale, consumer-facing web applications. Specialist in React ecosystem architecture, design systems, developer tooling, and frontend platform work. Track record of building organization-wide shared infrastructure at CarGurus, Chewy, and GameStop. Strong expertise in TypeScript, Next.js, Node.js, GraphQL, and AWS.

CORE TECHNOLOGIES

Frontend: React, Next.js, Remix, TypeScript, Radix UI, Tailwind CSS, RxJS, AngularJS/Angular Backend: Node.js, NestJS, Fastify, GraphQL, REST APIs, Java/Spring Infrastructure: AWS, DynamoDB, MySQL, Docker, Nx Monorepos, CI/CD Pipelines Practices: Design Systems, Micro-frontends, Feature Flags, Core Web Vitals, A/B Testing, OAuth2/OIDC

PROFESSIONAL EXPERIENCE

CarGurus (Feb 2023 - Present) Senior Software Development Engineer

Built and owned the end-to-end MVT (A/B testing) platform — Remix SSR admin app (91 PRs), Java/Spring backend, and TypeScript/Node.js client library (22 PRs) — enabling experimentation across every product surface at CarGurus.

Core contributor to the HTTP client monorepo (56 PRs): multi-package TypeScript/Node.js library built on Wretch/Undici with custom middlewares. Shipped auth-fetch (OAuth2), not-modified (ETag/LRU caching), circuit breakers, and Pino/Sentry middleware — adopted org-wide as the HTTP standard.

Contributed 39 PRs to the shared Remix platform library, integrating MVT middleware, OAuth2 auth, SSR Proxy, OTEL spans, and analytics UUID management into the shared Remix request lifecycle.

Led Snowplow analytics tracker instrumentation (13 PRs): Honeycomb distributed tracing, Core Web Vitals metrics, OneTrust consent schemas, and schema validation preventing malformed experiment data from corrupting the data pipeline.

25 PRs to Chassis (React design system); led Showroom UI component extraction (55 PRs) into independently versioned packages; built shared ESLint/Prettier/TypeScript config; executed EU infrastructure migration for Header/Footer service; authored ADRs driving cross-team alignment.

500+ merged PRs · 60+ repos · 358 tickets closed · 71 bugs resolved


GameStop (2021 - 2022) Senior Software Engineer

Led frontend development of the Product Listing experience on the rebuilt gamestop.com, serving millions of monthly visitors. Established the shared React component library and Nx monorepo architecture supporting two independent Next.js micro-frontend applications.


Chewy (2020 - 2021) Senior Software Engineer

Designed and built the GraphQL microservice layer for the Autoship subscription management system, unifying multiple REST APIs into a single, optimized frontend interface. Built the customer-facing Autoship management UI (Next.js) — a core revenue-generating feature enabling subscribers to manage orders, frequency, and preferences.


Liaison International (2019 - 2020) Senior Software Engineer

Designed and built front-end flows with REST API integration using React, RxJS, and ES6.


EARLIER CAREER

Arthur Lawrence (2015–2019) – Software Engineer / System Analyst. Clients: Deloitte (NH DHHS Electronic Application System), Salesforce, AbbVie.

Globant (2014–2015) – Software Engineer / System Analyst. Clients: Salesforce (Dreamforce), Hortonworks, AbbVie.

Global Lynx, Uakami, Televisa, Royal Holiday, Distrito 01, Grupo SIM, D4i, Lotojuegos, Infologic (2003–2014) – Progressive roles from Jr. Programmer to System Analyst. Full-stack development with PHP, JavaScript, Python, VB6, SQL Server, MySQL, and AWS.

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