Dillon Ruiz-Hamilton

Full-Stack Software Engineer · 13 years

dillonrhamilton@gmail.com in/dillon-hamilton

Professional Summary

Full-stack engineer with 13 years of experience building production systems across React, TypeScript, Java/Spring Boot, and GraphQL. Proven across healthtech, e-commerce, and platform engineering — from patient-facing EHR tools at Memorial Sloan Kettering to loyalty program infrastructure serving 1M+ members at Wayfair. Comfortable owning work end-to-end, from schema design to deployment.

Skills

Languages & Frameworks: TypeScript, React, React Native, Next.js, Java, Spring Boot, Python, GraphQL, PHP
API & Data Layer: Apollo Federation, Netflix DGS, REST APIs, GraphQL schema design
AI / ML: LangChain, Retrieval-Augmented Generation (RAG), Vertex AI, Gemini, Anthropic API, multi-agent orchestration, Model Context Protocol (MCP)
Testing & CI/CD: Playwright, Buildkite, Azure Pipelines, Jenkins, Docker
Observability & Analytics: Grafana, Google Core Web Vitals, A/B testing, D3.js
Cloud & Infrastructure: AWS, GCP, Azure

Work Experience

Software Engineer · Wayfair (Contract)

01/2025 – Present

Built a PagerDuty-triggered RAG incident triage bot using Python, Vertex AI, and LangChain with multi-agent orchestration and conversational memory — reducing root-cause identification time by ~70% for on-call engineers across the org.
Built an AI-augmented CI pipeline integrating an Anthropic model with Buildkite to auto-diagnose Playwright test failures and post fixes to a shared Slack channel — reducing manual triage from 5–10 minutes per failure to near-zero and surfacing flakiness targets for rewrite.
Built and deployed a Jira MCP server; drove Model Context Protocol (MCP) adoption within the team, establishing shared guidelines on appropriate use patterns.
Delivered multiple product initiatives for the Wayfair Rewards loyalty program (1M+ members, 15%+ of U.S. revenue), including a standalone enrollment purchase flow built across React/TypeScript, Java/Spring Boot, Apollo Federation, and Netflix DGS.
Owned and stabilized the Playwright end-to-end test suite: resolved flaky parallel/serial failures, implemented CI-aware test selection via Buildkite environment variables, and expanded mobile web coverage.

Staff Solutions Engineer · Walmart (Contract)

06/2022 – 12/2024

Improved web performance across React and Next.js codebases, achieving a 'Good' Google Core Web Vitals rating and a 50% reduction in Interaction to Next Paint (INP).
Built React dashboards for CI/CD pipeline observability — visualizing job health, runtimes, and failure rates — backed by Azure data pipelines.
Led monorepo tooling improvements and build caching initiatives, reducing CI overhead across Walmart's engineering org.

Software Engineer II · Carbon Health

02/2021 – 06/2022

Shipped a national COVID-19 clinic locator in Next.js and Google Maps API, supporting routing across 100+ clinic locations in 17 states — part of a network that delivered 2.1M+ COVID tests and 1.5M+ vaccines.
Built patient onboarding and sign-up funnel features for the EHR platform across React Native and Next.js, integrated with an A/B testing framework to measure retention.

Senior Front-End Engineer · Memorial Sloan Kettering Cancer Center

01/2017 – 02/2021

Built a React-based internal EHR platform serving 1,400+ attending physicians and 4,000+ oncology nurses — features included radiology scan viewing, patient charts, lab trend graphs, and high-performance tables over large clinical datasets.
Implemented complex state and data management using RxJS and Redux to streamline clinician workflows across structured clinical data at scale.
Delivered D3.js data visualizations for patient dashboards in close collaboration with clinical, design, and data science teams.

Education

BA, Psychology · New York University