Luiz – Ruby, PostgreSQL, Ruby on Rails

A software development company building an AI-refereed solo adventure system — a tabletop-style role-playing game experience powered by AI acting as the game master, designed for solo play.

• Built leatherarmor.io on a Ruby, Python/FastAPI, and React/TypeScript stack.
• Built a multi-step LLM pipeline that separated AI judgment from deterministic game mechanics.
• Implemented RAG-backed retrieval for world state, lore, NPCs, and locations.
• Implemented tool-calling agents and ran model fine-tuning with OpenAI.
• Integrated Stripe subscriptions and built a pricing sync script.
• Deployed the system on AWS with Terraform-managed infrastructure and Ansible configuration management.
• Built GitHub Actions CI/CD with per-PR ephemeral environments and automatic teardown on merge.

An education technology company providing a leading learning management system (LMS) used by educators, along with a broader ecosystem of tools and partnerships designed to support and improve learning experiences.

• Designed and maintained complex Sidekiq background jobs processing high-volume data pipelines with PostgreSQL and Redis under strict reliability and idempotency requirements.
• Led production debugging across the full stack from browser paint to the web server interface.
• Performed vulnerability assessments with Burp Suite and shipped security patches across multiple repositories and languages, closing 100+ vulnerabilities.
• Authored and reviewed technical plans to surface missing requirements and ambiguous definitions before development began.

An all-in-one platform for coaches and educators building expert businesses, offering tools for courses, coaching, communities, and more.

• Led development of Rails and React features using the company design system.
• Built and ran landing-page and conversion experiments, bucketing users into cohorts and iterating on results to lift conversion.
• Diagnosed and resolved production incidents with Sentry, keeping the team’s unresolved issues at zero throughout the tenure.
• Delivered four KPI-impacting features in one year.

A software development studio with 15 years of experience empowering enterprises with state-of-the-art technology and design solutions that drive measurable results.

• Delivered international client projects with distributed teams across time zones.
• Introduced Docker-based development environments, standardizing local setups across the team.
• Improved application performance through targeted caching strategies for several clients.
• Participated in requirements evaluation and work scoping with clients and other team leads.
• Mentored developers and led a project-dedicated team of eight engineers.

A computer and network security company focused on digital risk protection and threat intelligence, now operating as part of a larger cybersecurity and networking company following an acquisition.

• Served as the sole engineer on the internal sales automation platform.
• Built upsell and churn-risk detection workflows using Node.js, Python, MongoDB, and HubSpot APIs.
• Owned Python billing scripts supporting Sales operations end to end.
• Collaborated directly with Sales and Customer Success to translate business requirements into working tools.