Yoann Jaspar

@yoannj

Porto, PortugalJoined April 2026

About

Ex-Loom/Atlassian Sr Software Eng, recently moved to Porto, PT. On a mission to write the "beautiful code" and be decent human being.

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Yoann Jaspar's blogs

Refractblog.userefract.io3 posts

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Interface-First SaaS. How to Swap Infrastructure Without Rewriting Product Logic

May 5 · 7 min read · Interface-first SaaS means product logic depends on domain interfaces, while vendor SDKs stay behind adapters. This is not abstraction theater. It is a way to keep billing, RBAC, and delivery paths st

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The hidden revenue tax of vendor-coupled SaaS architecture

Apr 27 · 7 min read · TL;DR Definition: The hidden revenue tax in vendor-coupled SaaS architecture is the recurring cost of commercial changes that trigger multi-system rewrites because business rules live inside provider

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Why I'm building Refract after five years at Loom

Apr 20 · 4 min read · TL;DR: Refract is the app foundation I wish I had: billing, permissions, API contracts, and background workers set up from day one -- Also known as a boilerplate. The goal is simple. Own checkout and

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Yoann Jaspar

About

Available for

Yoann Jaspar's blogs

Recently published

Interface-First SaaS. How to Swap Infrastructure Without Rewriting Product Logic

The hidden revenue tax of vendor-coupled SaaS architecture

Why I'm building Refract after five years at Loom

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Yoann Jaspar

About

Available for

Yoann Jaspar's blogs

Recently published

Interface-First SaaS. How to Swap Infrastructure Without Rewriting Product Logic

The hidden revenue tax of vendor-coupled SaaS architecture

Why I'm building Refract after five years at Loom