About

The Saga of Jón

Developer, saga enthusiast, professional dragon-botherer. The long version, plus a letter you can forward to your hiring manager.

I grew up in Reykjavík on a steady diet of Norse myth and Nintendo cartridges, which explains almost everything that follows. By day I'm a full-stack developer — ten years of building APIs, frontends, and the unglamorous plumbing in between. By night I am, depending on the hour, a Tarnished, a Shinobi, or a Hunter.

I gravitate toward the trickster gods — Loki, Hermes — not for the chaos, but for the lateral thinking. The best engineering I've done has been Loki-shaped: the sideways solution nobody asked for that quietly becomes the way things are done. My favorite hero is Odysseus for the same reason. Strength is fine; cleverness gets you home.

I'm an INFJ, which in practice means I'll be quiet in your stand-up and then send you a four-paragraph document about the thing nobody mentioned. I do my best thinking with a cup of masala chai — extra cardamom — and my best debugging at 1 a.m. with a cat on the keyboard, which is also how most of my typos happen.

Things I believe: software should outlive its author's enthusiasm. Error messages are user interface. Every codebase is a saga — it deserves a narrator who cares. And somewhere in every hard problem there is a hidden wall you can roll through.

Cover letter

Jón Agnar Stefánsson Reykjavík · June 2026

Dear hiring team,

I'm a full-stack developer with ten years of experience shipping web platforms end to end — from schema design and API architecture to the pixel-level details of the frontend. I've spent the last four years at a fintech scale-up leading the rebuild of a payments dashboard used by 40,000 merchants, cutting page load times by 70% and support tickets by half.

What I bring beyond the stack: I write. Documentation, ADRs, postmortems, onboarding guides — I treat them as part of the product, because the next engineer is also a user. Teammates describe me as the person who listens through the whole meeting and then asks the question that reframes it.

I work comfortably across TypeScript, Go, and Python; I care about accessibility, performance budgets, and boring, reliable deployments. I'm at my best on small teams with real ownership, solving problems that need both rigor and a little lateral thinking.

I'd love to tell you more — my CV is one page away, and my inbox is open.

Jón Agnar Stefánssonjon@jonnxor.is · jonnxor.is

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