Senior Full Stack Engineer

I'm Raymond Sapida. I focus on the plumbing of the web, designing stable backends and scalable data pipelines.

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Selected Engagements

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0x01 / Product Engineering

SaaS Integration Platform

  • [+] Architected and scaled Rails/Sidekiq services processing 1M+ monthly transactions between Shopify, BigCommerce, and QuickBooks.
  • [+] Resolved race conditions in high-volume syncs via Sidekiq middleware, eliminating duplicate-write incidents.
  • [+] Engineered retry, backoff, and rate-limit handling for unreliable third-party APIs.
RAILS SIDEKIQ POSTGRES
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0x02 / Data Engineering

ML-Driven Sensor Data Pipeline

  • [+] Engineered a queue-decoupled ETL pipeline (AWS SQS, Lambda, ECS) handing heavy computation from Rails to Python services for machine learning analysis.
  • [+] Built idempotent workers guaranteeing exactly-once processing of millions of sensor records across batch retries.
  • [+] Delivered reproducible, HIPAA-compliant AWS environments via Terraform for university research studies.
PYTHON AWS_LAMBDA TERRAFORM

history Legacy & Contributions

Education LMS Platform

Custom Rails learning management system, from data model through production support. Designed and taught a full-stack engineering curriculum.

E-commerce Prototyping

Rails and WordPress e-commerce prototypes. API integration guides and technical documentation for payment services.

Container Orchestration API

RESTful API for container orchestration and access control, plus a real-time container health dashboard. Mentored junior developers on SOLID principles.

Side Projects

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neurology
0x03 / Applied AI

LLM Wiki

A personal knowledge base that began as a Rails bookmark collector and evolved into a RAG system. Scrapes and embeds saved content, then surfaces it through semantic search and LLM-powered question answering.

RAILS RAG EMBEDDINGS
sports_esports
0x04 / Systems Engineering

Bunot.io

A real-time, state-synced implementation of Filipino Mahjong. Exploring high-concurrency game logic and Monte Carlo algorithm for intelligent bot decision-making.

RAILS ACTION_CABLE REDIS

Technical Arsenal

A specialized toolkit spanning the entire lifecycle, optimized for stability and throughput.

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Backend Architecture

Ruby on Rails Node.js PostgreSQL Redis AWS Lambda
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Data & ML

Python Pandas/NumPy Terraform ETL Pipelines
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Frontend Ecosystem

React / Next.js TypeScript Tailwind CSS Redux Hotwire/Stimulus