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Hi, my name is

Theodore Zurek-Dunne

Senior Software Engineer | Go, TypeScript, Svelte, React | Building scalable, high‑performance systems with measurable business impact.

9+ years experience
·
Senior / Lead
·
Hybrid/Remote
·
Toronto (EST)
·
Full-time + Contract

> Led Node.js → Go migration — cut p95 latency and infra cost on high-traffic microservices
> Built design systems that accelerated delivery 33% and lifted user adoption 65%
> Mentored 4 engineers; founded Kato.Studio; shipped 95+ Lighthouse production sites

Let's Talk Resume

~/impact/

43%

UI/UX Improvement

User testing scores increased through design system implementation

65%

User Adoption Increase

Led comprehensive redesign that drove significant adoption growth

33%

Faster Development Cycles

Built reusable components and design systems that accelerated delivery

53%

Organic Traffic Growth

Achieved 95+ Lighthouse scores with performance-optimized sites

~/tech stack/

TypeScript

Python

λ Alpine.js

λ JavaScript/Typescript

React

Next.js

Node.js

λ Bun

Docker

PostgreSQL

SvelteKit

Git

import {

Netlify HTML5 CSS3 Nest.js GraphQL SASS Socket.io Vue Pnpm MongoDB Npm GraphQL Playwright Cypress HTTP/REST Design Systems Agile Methodologies SEO Optimization UI/UX Design Team Management Design Systems CI/CD

} from "~/toolbox"

activate hyperdrive

~/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.

~/projects/

wispberry-tech/wispy-auth

Lightweight authentication service in Go.

Go 0 0

wispberry-tech/grove

Grove — a Wispberry project written in Go.

Go 0 0

wispberry-tech/wispy-grove-lang-support

Language support and tooling for the Grove ecosystem.

JavaScript 0 0

~/achievements/

Winner of the 2019 McMaster Design League UI/UX Designathon

Consistently received 5-star client ratings for freelance projects

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Let's make something awesome!

Scaling systems with TypeScript, Go, React, and Next.js. I focus on what matters: faster systems, lower costs, better user experience.

> Get in Touch