Callan Zimmermann

cat ./about.md

I'm an ecommerce architect and full-stack developer with 8+ years rooted in the Magento ecosystem and stretching across Shopify, BigCommerce and beyond. I've spent my career on the hard parts of commerce: replatforms, performance, complex catalog and checkout logic, and the integrations that keep a store honest — ERPs, payment providers, shipping and search.

I'm at Hyvä, where I'm the core architect behind Hyvä CMS — a live visual page editor built directly into Magento: real-time editing, structured content, no headless middleman, no vendor lock-in. Before that, during the Web3 goldrush, I built the shovels — infrastructure and developer tooling for teams shipping on-chain products.

These days I work AI-enhanced. The job has shifted from playing every instrument to being the composer — directing AI agents, tooling and teams so the whole orchestra plays together. Complex projects that used to take months now ship in a fraction of the time, without losing the architectural rigor that keeps them alive.

My sweet spot is the full picture — owning the architecture end to end and getting it shipped. I care about stores that load fast, convert well, and stay maintainable long after launch.

ls ./stack

cat ./experience.log

• Core architect — Hyvä CMS (current)

  Architecting Hyvä CMS at Hyvä: a live-view visual page editor built natively into Magento — real-time preview, structured content, and zero vendor lock-in.

• AI-enhanced delivery

  Orchestrating AI agents and tooling across the delivery pipeline — compressing complex builds from months to weeks while the architecture stays the score everyone plays from.

• Ecommerce architecture & replatforming

  Led builds and migrations end-to-end across Magento 2 / Adobe Commerce, Shopify and BigCommerce — platform selection, data migration, extension strategy and go-live.

• Modern storefronts

  Delivered Hyvä-based and headless storefronts that cut page weight dramatically and turned Core Web Vitals green.

• Systems integration

  Connected stores to the real world: ERP sync, payment gateways, shipping providers, search engines and marketing platforms.

• Web3 infrastructure

  Built developer tooling and infrastructure through the Web3 goldrush — the picks-and-shovels side: APIs, platforms and services other teams shipped on.

• Performance & scale

  Profiled and tuned stores for peak traffic — caching layers, database optimization and frontend budgets that hold up on sale day.

./contact --send

Planning a replatform, wrestling with performance, or need an architect who's seen it break before? Send a message — it lands straight in my inbox.