Hiro P.

Headline Senior Full Stack Engineer | Node.js, NestJS | Angular, Next.js | AWS, GCP | Event Pipelines & Marketing Attribution Overview Full Stack Engineer with 10+ years of experience (Top Rated on Upwork since 2018, with over 15,600 tracked hours). I specialize in shipping production-grade systems across healthcare, fintech, online gaming, real-time auctions, travel, rentals, B2C marketplaces, and IoT. I take full ownership of problems end-to-end—from architectural design and stack selection to implementation, deployment, and ongoing maintenance. While I have experience leading teams as CTO and Tech Lead, I remain a hands-on engineer at heart. Recent Highlights (2025–2026) Server-Side Event Pipeline (Healthcare): Designed and built an event ingestion pipeline for a US telehealth platform featuring idempotency, deduplication, outbox pattern, retry workers, and PHI filtering. Implemented integrations with Braze, GA4, Meta, TikTok, and Reddit Conversion APIs with end-to-end production attribution. 2023–2026 · Paybook (Syncfy), fintech / open-banking data platform, Mexico - Built and maintained backend services in Rust on AWS Lambda (API Gateway, DynamoDB, SQS) for the Syncfy API, replacing legacy Node services with lower latency and cost. - Led the authentication migration from Auth0 to WorkOS: user and organization migration with zero downtime, SSO and SAML for enterprise customers, just-in-time provisioning, session and token handling on the Rust services, and the Angular admin workspace that goes with it. - Evaluated and prototyped alternatives (Descope) before the WorkOS decision, with a cost and risk comparison for the leadership team. - Owned CI/CD for those services (AWS CodeBuild, CodeDeploy, CodePipeline) and the Angular front-end workspace. Pipeline Admin Console: Developed a management portal using Angular and PrimeNG featuring event catalogs, inspection logs, an API playground, vendor health monitoring, and multi-environment management. Serverless Backend (Fintech): Built Rust-based backend services on AWS Lambda with WorkOS authentication and JIT provisioning. Messaging Audit & Certification: Conducted end-to-end audits of 44 Braze canvases, updating templates and aligning event contracts with producer services. Engineering Approach I integrate AI tools (Claude Code) directly into my development workflow to accelerate implementation while maintaining high standards through review, testing, and production verification. This efficiency allows me to focus on system design, correctness, and edge-case reliability. Technical Skills Backend: Node.js (NestJS, Express), Python (FastAPI, Django), Rust, PHP (Laravel), Strapi, REST APIs, Event-Driven Architecture, Outbox Pattern, Queues, Multi-tenant Architecture (Postgres RLS). Frontend: Angular, Next.js, React, Vue.js. Cloud & DevOps: AWS (Lambda, EC2, Elastic Beanstalk, S3, SQS, RDS, DynamoDB, Cognito, CloudFront, Route 53, CI/CD), Google Cloud (Cloud Run, Cloud SQL, Secret Manager), Docker, NGINX, GitHub Actions. Data & Storage: PostgreSQL, MongoDB, SQL Server, Snowflake, Cassandra, Redis, Elasticsearch. Integrations: Stripe & Stripe Connect, BridgerPay, Authorize.Net, Braze, GA4, Meta / TikTok / Reddit Conversion APIs, Google Tag Manager, OpenAI & Anthropic APIs. Availability & Languages Availability: Up to 30 hours/week Languages: English (Fluent), Spanish (Native/Fluent)