# Pedro Lizárraga: Experience Senior Software Engineer | Full-Stack · Mexicali, Baja California, Mexico · Remote Email: hello@pedrolizarraga.com · LinkedIn: https://www.linkedin.com/in/pedro-lizarraga-brambila · GitHub: https://github.com/plizarraga HTML version: https://pedrolizarraga.com/experience · PDF: https://pedrolizarraga.com/pedro-lizarraga-cv.pdf ## 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 - **Databases:** PostgreSQL, MySQL, SQL Server, Oracle, Cloudflare D1, Prisma, Drizzle - **Cloud:** AWS Lambda, Amazon S3, Microsoft Azure (Azure AI Search, Azure Blob Storage), Cloudflare Workers - **AI Engineering:** AI agents, LLM applications, OpenAI APIs, Vercel AI SDK, tool calling, RAG, workflow automation - **Testing & Delivery:** Jest, Vitest, Playwright, Testcontainers, Docker, GitHub Actions, Bitrise, Azure DevOps, Git, CI/CD, Agile, Scrum, Kanban, Jira - **Healthcare:** HL7 FHIR, Epic FHIR, healthcare data transformation, mapping, and normalization ## Experience ### Freelance Software Engineer · Independent May 2022–Present · Remote, Mexicali, Baja California, Mexico #### AI Appointment Agent for a Dental Clinic (in development) Oct 2026–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. Stack: TypeScript, Vercel AI SDK, OpenAI APIs, Cloudflare Workers, Durable Objects, D1, Drizzle, Hono, WhatsApp Cloud API, Better Auth, React, Vitest, GitHub Actions Case study: https://pedrolizarraga.com/work/ai-appointment-agent.md ### Senior Software Engineer · Publicis Sapient May 2022–Aug 2026 · Remote, Mexicali, Baja California, Mexico - Conducted code reviews and mentored and onboarded engineers joining the projects. #### Healthcare Platform Mar 2024–Aug 2026 - 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 Case study: https://pedrolizarraga.com/work/healthcare-platform.md #### Document Search API Sep 2023–Feb 2024 - Built a REST API with NestJS that enables search over proprietary documents using Azure AI Search semantic search and Azure Blob Storage. Stack: NestJS, REST, Azure AI Search, Azure Blob Storage #### AngularJS Migration Sep 2022–Aug 2023 - Migrated an AngularJS (Angular 1) application to Angular 2+. Stack: AngularJS, Angular #### HR Reporting Tool May 2022–Aug 2022 - Built a human-resources reporting tool with React and Vite. Stack: React, Vite ### Senior Frontend Developer · Fender Musical Instruments Corporation Oct 2016–May 2022 · Remote, Ensenada, Baja California, Mexico - 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. Stack: Angular, TypeScript, Node.js, Express.js, AWS Lambda, Amazon S3, Agile Case study: https://pedrolizarraga.com/work/dealer-b2b-commerce-platform.md ### Senior Full-Stack Developer · docDigitales Aug 2014–Oct 2016 · Mexicali, Baja California, Mexico - 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 Case study: https://pedrolizarraga.com/work/electronic-invoicing-saas-migration.md ### Full-Stack Developer · Secretaría de Seguridad Pública Apr 2012–Jul 2014 · Mexicali, Baja California, Mexico - Led development of SAFyS, a web application used to administer and track public-security funds and subsidies. - Automated monthly accounting and reporting activities using C#, ASP.NET/.NET, JavaScript, SQL Server, and Oracle. Stack: C#, ASP.NET/.NET, JavaScript, SQL Server, Oracle ### Software Developer · Grupo GM Transport Sep 2011–Mar 2012 · Mexicali, Baja California, Mexico - Developed C# and ASP.NET administrative systems supporting transportation operations and back-office processes. Stack: C#, ASP.NET ### Software Developer · Seres Soluciones en Software Mar 2010–Aug 2011 · Mexicali, Baja California, Mexico - Developed client-server business applications with WinDev, WebDev, MySQL, and HyperFile Classic. Stack: WinDev, WebDev, MySQL, HyperFile Classic ## Selected projects ### [starter-template-nestjs](https://github.com/plizarraga/starter-template-nestjs) 2026 - 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. Case study: https://pedrolizarraga.com/work/starter-template-nestjs.md ### [finance-tracker](https://github.com/plizarraga/finance-tracker) Jan 2026 - 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) Jul 2024 - 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 · Jun 2024 - Modern GraphQL with Node – Complete Developers Guide · Udemy · Jul 2024 - 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 · 2005–2009 ## Languages Spanish, English (B2+)