About me

Introduction

I’m Demo. 15+ years building software, mostly embedded inside product teams in the US.

I stay with clients for years, because I own the parts of a product that get harder as it grows.

My background is in Human-Computer Interaction research: the best interfaces are the ones people don’t notice. I work from Panama, in US-friendly hours.

Selected experience.

  • Healthcare

    Collective Health

    Frontend Software Engineering Contractor

    Was the point of contact for frontend architecture, design system and accessibility on a US health-benefits platform.

    600K+members

  • B2B SaaS

    ProductPlan

    Fullstack Software Engineering Contractor

    Owned frontend architecture and design-system consistency on a product-roadmapping platform, with full autonomy.

    3,000+companies

  • Fintech & Banking

    Bank of America, Yodlee, American Express

    Senior Software Engineer at ADMIOS

    Built accessible banking frontends, where a missed contrast ratio is a compliance issue.

    50M+users

From people I’ve worked with.

He consistently delivers high-quality, performant code at remarkable speed, all while ensuring the architecture is solid and maintainable.

Nicholas KimClient, ProductPlan

He pushed for the best possible outcome, not just what was easiest to build. When it comes to web standards and accessibility, Demo has the deepest knowledge of anyone I know.

Yelizaveta PlotnikovaDigital Product Designer, ProductPlan

Read the full recommendations on LinkedIn (opens in new tab)

What I own.

All layers, same experience
Backend, frontend, mobile.
Accessibility & i18n
WCAG 2.2 and real localization, as requirements, not retrofits.
Design systems
Tokens, components, and the migration that adoption depends on.
Legacy modernization
Making the risky part safe to change, then changing it.

Day to day

Frontend
TypeScript, JavaScript, React, Next.js, React Native, Vue, Angular, Tailwind, CSS / Sass
Backend
Node.js, Ruby on Rails, Laravel, REST
Data & cloud
PostgreSQL, Redis, Firebase, Supabase, AWS, GCP, CI/CD
Testing
Jest, Playwright, RSpec

How I work.

  1. Start with the people who'll use it, and listen before solving
  2. Accessibility is a requirement, not a nice-to-have
  3. Understand the 'why' before writing the 'how'
  4. Use AI to move faster, and review every line it writes

Three master’s degrees. Scrum.org PSM II and PSPO I. ITIL, COBIT 5 and IPMA Level D.

Education

Certifications

  • Professional Scrum Product Owner Certified I (PSPO I)

    Scrum.org

  • Professional Scrum Master Certified II (PSM II)

    Scrum.org

  • Professional Scrum Master Certified I (PSM I)

    Scrum.org

  • COBIT 5 Foundation

    APMG

  • IPMA® Level D

    IPMA

Beyond code.

  • Cycling
  • Sourdough baking
  • Cameras
  • Electronics
  • Mentoring
  • Books
  • Coffee

Hiring for the long term?

Thirty minutes, straight to me. If I’m not the right person, I’ll tell you.

Book a 30-minute intro (opens in new tab)How I work with teams