Theodore Zurek-Dunne

Senior / Lead | 9+ years experience
Toronto (EST) • 99theodore@gmail.com • LinkedIn • Portfolio

Senior Software Engineer with over 9 years of experience working with TypeScript, Go, React, and Svelte to deliver fast, scalable systems. Led Node.js→Go migrations cutting latency and costs, built design systems, shipped UX improvements boosting adoption.

Favorite Tools

TypeScript, Go, Python, Alpine.js, JavaScript/Typescript, React, Next.js, Node.js, Bun, Docker, PostgreSQL, SvelteKit

Experience

Freelance — Systems Performance Engineer (September 2024 - Present)
  • Migrated Node.js APIs to Golang, achieving 20% infrastructure cost reduction and 35% faster response times.
  • Implemented URL-encoded data APIs with 10-15% smaller payloads and 16% faster deserialization.
  • Designed cloud-agnostic architectures deployed across DigitalOcean, Vultr, Fly.io, and Railway.
Indie Tech — Full-Stack Developer, UI/UX Designer (May 2022 - July 2024)
  • Spearheaded UI/UX overhaul, resulting in a 43% improvement in user testing scores and a 27% decrease in UI-related support tickets.
  • Implemented REST endpoints & UI interfaces around complex computational models on an event-driven architecture using Python micro-services.
  • Developed design systems and reusable components, reducing development time by 33% and decreasing technical debt by 42%.
  • Built multi-tenant access controls, real-time collaboration features, and approval workflows.
  • Corroborated to ensure ensure SOC 2 compliance, enhancing data security.
Kato.Studio — Founder (October 2020 - July 2021)
  • Elevated client websites to achieve 95+ Lighthouse scores, resulting in an average increase of 53% in organic traffic and a 152% decrease in bounce rates.
  • Engineered custom CMS and microservices architecture, improving content management efficiency by an average of 62%.
  • Delivered analytics dashboards that increased client data utilization by 4x.
  • Leveraged emerging industry trends to deliver innovative solutions, resulting in a 100% client satisfaction rate.
Freelance — Full-Stack Developer, UI/UX Designer (December 2019 - October 2020)
  • Collaborated with cross-functional teams to integrate design concepts and backend functionality, reducing project timelines by 27%.
  • Contributed to design systems and reusable components, increasing development efficiency by 2x.
  • Built real-time stream overlay system for e-sports broadcasts.
SalesGrowth Development Inc — Frontend Developer, UI/UX Designer (December 2018 - December 2019)
  • Optimized four client websites, improving SEO rankings by an average of 21%, accessibility scores by 42%, and load times by 22%.
  • Led comprehensive redesign of the client application, resulting in a 65% increase in user adoption.
  • Enhanced usability in existing client applications, leading to a 32% reduction in user-reported issues and a 28% increase in user satisfaction scores.
Freelance — Freelance Graphic Designer (January 2016 - December 2018)
  • Collaborated with 23 clients to identify and execute optimal design solutions.
  • Delivered tailored solutions for rebranding, packaging, and marketing materials, resulting in an average 45% increase in brand recognition for clients.

Achievements