Francisco GuzmánKnown as Panchew

I defined the product direction, chose Cloudflare and reviewed an AI-assisted implementation. The platform brings together an interactive CV, email delivery of a downloadable CV, Google Calendar booking and post-session payment requests. The work includes durable delivery records, duplicate prevention and separation of test and live payment state. A production CV request was verified through inbox delivery and PDF download; both payment providers passed sandbox buyer-payment tests.

TypeScript · Cloudflare Workers · API integrations · Product delivery · Testing

I’m building workflows that define the work, run an agent, validate the result, and preserve a reviewable record. The system combines bounded execution and retries with human approval for consequential decisions. Public experiments document both completed work and failures: a QA agent reported passing checks without reading files, demonstrating why a model’s verdict alone is insufficient evidence.

Python · AI agents · Orchestration · Testing · Technical leadership

I developed a containerized runner that connects Ollama models to controlled file, command, and Git tools. It validates tool calls, repairs supported argument errors, limits execution rounds, and retains a transcript with explicit termination states. The public v2 delivery includes a recorded integration run; its scope does not establish reliability across arbitrary models or tasks.

Python · AI agents · Docker · Testing · API integrations

Working alongside a small team, I contributed quote requests and lead capture, transactional email and notifications, anti-spam improvements, and front-end work with JavaScript and SCSS. I led the Ruby 2.7-to-3.x stack upgrade, removing a prerequisite blocker for the Rails upgrade.

Ruby on Rails · JavaScript · API integrations · Platform modernization

I coordinated the Ruby 2.x-to-3.x upgrade plan, breaking technical debt into manageable delivery work. I repaired a broken RSpec suite, helped strengthen Git workflows and code reviews, and trained teammates on GitHub Copilot. The role combined hands-on backend work with collaboration across engineering and product.

Ruby on Rails · RSpec · Platform modernization · Technical leadership · Mentoring

I translated business requirements into technical work and contributed to architecture and implementation decisions. My work included REST integrations with external credit-data providers, error handling and testing, pair programming, mentoring, and onboarding documentation.

Ruby on Rails · API integrations · Testing · Technical leadership · Mentoring

I completed the Twilio Proxy integration so technicians and customers could communicate through provisioned numbers without exposing their personal phone numbers. I also implemented and maintained endpoints and integration callbacks in the core Tech API.

Ruby on Rails · API integrations · Twilio · Testing

I developed and deployed TimeTracker, a custom application modeled on the team’s Harvest workflow. It replaced the third-party time-tracking service with an internal tool for recording employee hours across projects.

Ruby on Rails · Product delivery

I led technical architecture and end-to-end development, translating stakeholder feedback into application features and managing delivery. As the product matured, I helped recruit and onboard developers and transitioned the platform to a dedicated team.

Ruby on Rails · Product delivery · Technical leadership · Mentoring

I worked with ModCloth’s US team over a multi-year engagement, contributing social “Like” features and an ActiveRecord-based ETL workflow. I also helped launch CreativeAllies and contributed its image watermarking pipeline. CrowdInteractive is now known as MagmaLabs.

Ruby on Rails · ETL · Product delivery