My full CV, also available as a PDF and as Markdown. I'm based in Mexicali, Baja California, Mexico, and I work remotely.
Summary
I'm Pedro Lizárraga, a Senior Software Engineer with 15+ years of experience building scalable, reliable web applications across healthcare, e-commerce, finance, transportation, and government. I specialize in TypeScript, Node.js, NestJS, React, Angular, GraphQL, Cloudflare Workers, Durable Objects, Cloudflare D1, and Epic FHIR integrations, and I hold the Apollo Graph Developer – Associate certification.
I also build AI agents with the Vercel AI SDK as a freelancer, and I conduct code reviews and mentor engineers in cross-functional Agile teams.
Skills
Languages & Frameworks: TypeScript, JavaScript, Node.js, NestJS, Express.js, React, Next.js, Angular, Hono, Ruby on Rails, C#, ASP.NET/.NET
APIs & Architecture: GraphQL, Apollo Server, Apollo Federation, REST, system design, software architecture, design patterns
AI Appointment Agent for a Dental Clinic (in development)
–Present
Developing an AI agent that answers patient questions and books, reschedules, and cancels appointments for a dental clinic over WhatsApp, with a panel where the clinic team takes over conversations the agent cannot resolve.
Implemented tool calling and structured output with the Vercel AI SDK and configurable model providers (OpenAI, Anthropic, Google, OpenRouter) through a closed tool catalog; code enforces identity, policies, and output guards (invented prices, wrong dates), validated by an automated evals suite.
Built the backend on Cloudflare Workers, Durable Objects, D1, Drizzle, and Hono, and the team panel with React, with Vitest tests and a GitHub Actions CI pipeline.
Designed the solution as a reusable template, one deployment per client, to adapt it to other business niches.
Conducted code reviews and mentored and onboarded engineers joining the projects.
Healthcare Platform
–
Built GraphQL and Node.js services in TypeScript for a patient-facing healthcare web and mobile app (doctor search, appointments, lab results, notifications, dependents), owning the doctor search and details subgraph, system notifications, and caching in an Apollo Federation graph.
Integrated Epic FHIR APIs (Practitioner, Patient, Appointment, DiagnosticReport, Observation, plus lab tests and medications), parsing source payloads into normalized domain models and joining Epic data with other subgraphs.
Designed PostgreSQL models for notifications, preferences, and a cache of Epic practitioner data that avoids unnecessary Epic calls, plus GraphQL schemas and resolver patterns.
Strengthened delivery quality through Jest and Vitest test suites and cross-functional collaboration with frontend, mobile, QA, product, and engineering teams.
Helped the React Native mobile team migrate Android and iOS build and deployment pipelines from GitHub Actions to Bitrise.
Stack: TypeScript, Node.js, Apollo Server, Apollo Federation, GraphQL, PostgreSQL, Epic FHIR, Jest, Vitest, GitHub Actions, Bitrise
Built core experiences for Fender's dealer-facing B2B commerce platform, including product discovery, catalog, cart, ordering, and order-tracking workflows.
Designed scalable Angular application structures and improved responsive behavior and navigation across key journeys.
Connected frontend capabilities through serverless Node.js services running on AWS Lambda.
Collaborated with product, backend, and QA functions in Agile teams to plan, implement, test, and release customer-facing capabilities.
Conducted code reviews and mentored and onboarded engineers on the team.
Migrated a legacy WebDev electronic-invoicing platform to a Ruby on Rails SaaS, module by module, covering invoicing, cost control, payroll, customer, and supplier workflows, with parallel redirects until the legacy application was shut down.
Implemented full-stack functionality with Ruby on Rails, JavaScript, Bootstrap, and MySQL, balancing usability with dependable business processing.
Stack: Ruby on Rails, JavaScript, Bootstrap, MySQL
Created a production-ready NestJS 12 starter with Better Auth, PostgreSQL-backed sessions, RBAC, user administration, Prisma, Pino, and Vitest with Testcontainers, to bootstrap new backend projects with consistent best practices.
Built a mobile-first personal finance tracker with Next.js (App Router), Prisma, PostgreSQL, Better Auth, and automated tests with Vitest and Playwright.
RAG Chat over PDFs (personal MVP)
Built an MVP that answers questions over uploaded PDFs using NestJS, PostgreSQL, OpenAI embeddings and chat completions, and ChromaDB.
Certifications
Apollo Graph Developer – Associate · Apollo GraphQL ·
Modern GraphQL with Node – Complete Developers Guide · Udemy ·
TypeScript: Your Complete Guide and Handbook · Udemy
Design Patterns in JavaScript and TypeScript · Udemy
Clean Code and SOLID Principles · Udemy
Education
Bachelor of Engineering, Computer Systems Engineering · Instituto Tecnológico de Mexicali · Mexicali, Mexico ·–