Franklin Javier

Summary

Principal Engineer with 19 years building and scaling web and mobile products. Specialized in frontend architecture, performance, observability, design systems and accessibility, focused on turning complex operational workflows into fast, reliable, maintainable user experiences. Previously led an org of 100+ people as a Sr Engineering Manager; as a Principal, I drive cross-org outcomes through standards, guilds and design system governance. I use AI-assisted engineering workflows to speed up exploration and enforce consistency without replacing human decision-making.

Selected impact

• Reduced page load time from ~15s to ~600ms in a large e-commerce context.
• Improved mobile page performance by 50%+ for high-traffic experiences.
• Built an end-to-end practice operations platform for AEC firms, replacing spreadsheet-heavy processes with unified planning and time workflows.
• Delivered outcomes positioned as: 40% less time on admin tasks, 95% project staffing accuracy, and 10x faster workforce planning.

Core strengths

• Frontend architecture, modularization, maintainability
• Performance optimization (profiling, Web Vitals, render/bundle strategy)
• Observability (instrumentation, error monitoring, actionable diagnostics)
• Design systems and accessibility (WCAG), governance and adoption
• DX/tooling (templates, automation, CI-ready workflows)
• Cross-org leadership (guilds), mentoring, hiring, onboarding

AI-assisted engineering

Flow: Idea → Brainstorming → PRD → Writing plans → Implementation → Code review → PR

• Skills and playbooks enforce consistent architecture, component patterns, testing and review quality.
• Claude Code and Codex support refactors, scaffolding, tests and review; humans own trade-offs and decisions.

Recent stack

• Frontend: TypeScript, JavaScript, React, React Router, Remix, Vite, TanStack, shadcn/ui.
• Styling & UI: Tailwind CSS, Radix/Base UI, design systems (WCAG).
• Backend & data: Node.js, Drizzle, Prisma, SQL stored procedures, AWS/S3.
• Ops & observability: GitHub Actions/CI-CD, Playwright, Sentry, instrumentation.

Professional experience

Stone Giant Studio — Principal Engineer (Frontend)

Mar 2023 – Present · Dallas, TX (remote contractor)

• Built the AEC workforce planning and resource management product end-to-end through its current version, reaching over 1,500 registered users (erast.us).
• Delivered integrated workflows for staffing, capacity planning, time entry, and budget vs. actual tracking to replace disconnected tools with a single source of truth.
• Partnered closely with database engineering (stored procedures and data logic) to ensure correctness, performance, and clean domain boundaries.
• Shipped long-range planning experiences that support data-driven staffing decisions for multi-project, multi-office firms.

Grupo Boticário — Principal Engineer (Frontend)

Jan 2021 – Feb 2023 · Brazil

• Drove frontend architecture across web and mobile with a focus on performance and observability, improving reliability and reducing time-to-diagnose.
• Evolved and governed a design system and accessibility standards to improve consistency across products and ensure inclusive experiences.
• Scaled DX through shared templates, tooling and libraries; mentored engineers and influenced standards through guilds; supported POCs and M&A technical evaluation.

Grupo Boticário — Sr Digital Product Manager

Jan 2020 – Dec 2020 · São Paulo, Brazil

• Led multiple e-commerce squads, aligning roadmap delivery with technical execution and quality practices.

Beleza na Web — Head of Technology

Dec 2015 – Jan 2020 · São Paulo, Brazil

• Led technology strategy and delivery for a high-traffic e-commerce business across frontend and platform initiatives.
• Enabled multi-store/white-label theming and templates; introduced micro-frontends for checkout; supported the migration toward microservices.
• Delivered major performance gains (~15s → ~600ms) and shipped PWA + AMP initiatives to improve performance and SEO.

Earlier career: see my LinkedIn profile.

Side projects

• Zelus: condominium management platform centralizing operations, finances, incidents, documents, maintenance and service providers, with end-to-end issue tracking and an AI assistant grounded in condominium data (zelus.sh).
• Project Campfire: extracts tasks, commitments, decisions and deadlines from conversations; assigns owners and due dates; provides time-based views, search, and an audit trail back to the source (projectcampfire.io).
• Robot Loupe: human-in-the-loop review environment for AI-generated database changes, focused on dependency and impact visibility, safety checks, and standards enforcement before shipping (robotloupe.com).

Education

Universidade Anhembi Morumbi — Technologist, Systems Analysis and Development (2014–2016)

Languages

Portuguese (native) · English (professional) · Spanish (basic)