Resume

Professional Summary

Senior Backend & AI Systems Engineer with 15+ years of experience building scalable SaaS platforms, architecting distributed systems, and modernizing mature applications. Specialized in designing Retrieval-Augmented Generation (RAG) systems, AI product integrations, Model Context Protocol (MCP) servers, and production-grade LLM workflows.

Experienced in harness engineering, loop engineering, prompt orchestration, and embedding AI into operational workflows. Deep expertise in Ruby on Rails, PostgreSQL, APIs, distributed architectures, and building business-focused AI systems that improve automation, search, and decision support.

Core Expertise

AI Systems Projects

• Designed and deployed production-grade RAG systems for enterprise document search, contextual question-answering, and internal knowledge retrieval.
• Built MCP servers to expose internal business tools, APIs, and datasets to AI-powered applications.
• Developed AI-driven workflow automation using LLMs for operational efficiency, document summarization, and structured extraction.
• Designed loop engineering workflows for iterative retrieval, multi-step reasoning, and tool-calling pipelines.
• Built harness engineering frameworks to evaluate prompt reliability, edge-case handling, and response consistency.
• Implemented semantic retrieval pipelines using embeddings and contextual ranking strategies for improved output accuracy.

Professional Experience

Dasig Solutions, Inc.

Senior Engineer, Founder

2014–Present · Remote

• Architected and delivered backend systems for multiple international SaaS clients.
• Designed and deployed production-grade RAG systems for semantic search, enterprise retrieval, and AI-assisted workflows.
• Built MCP servers enabling secure LLM access to internal tools, business processes, and structured datasets.
• Implemented AI product integrations across SaaS applications for search augmentation, workflow automation, and operational tooling.
• Designed harness engineering systems for validating prompt robustness and model consistency in production.
• Built loop engineering workflows for multi-step AI reasoning, iterative retrieval, and tool orchestration.
• Implemented embedding pipelines and retrieval strategies for high-precision contextual outputs.
• Built and scaled Ruby on Rails applications used globally across multiple industries.
• Improved SQL and query performance, reducing page load times by 60%.
• Designed high-availability infrastructure maintaining 99.9%+ uptime.
• Modernized legacy Rails applications to improve release velocity and maintainability.
• Integrated payments, CRMs, analytics platforms, and external APIs.

MedCheck.com.ph

Engineering Lead

2016–Present

• First engineering hire; delivered MVP in 2 weeks.
• Led backend team of 5 engineers.
• Built healthcare APIs for enterprise and government integrations.
• Migrated monolith toward service-oriented architecture, reducing time-to-market by 30%.
• Increased test coverage to 90%+ and reduced production defects by 75%.

Sakura Sky Media

Lead Ruby Engineer

2013–2017

• Architected eCommerce Rails platforms and optimized Sidekiq workloads, reducing queue backlog by 80%.

Friendster / MOL Global

Senior Software Engineer

2010–2013

• Worked on high-traffic backend systems; improved bug turnaround by 50% through TDD and CI practices.

Early Experience

Branders.com · NEC Telecom · University of the Philippines Visayas

• Branders.com — Java/PHP web apps.
• NEC Telecom — C++/Java telecom systems.
• UP Visayas — Research Assistant.