About
Julien Avezou
Software Engineer · Toronto, Canada
Thinking engineer building systems, products, and workflows for the AI era. Previous experience in Fintech.
Highlights
- Key architect and developer of a system at Klarna to proactively verify millions of customers, leading to improved UX and huge cost savings
- Built and launched multiple applications independently
- Focused on reflection systems and engineering judgment in the age of AI - Author of The Thinking Engineer Toolkit
Technical Skills
Technologies and tooling I am comfortable with
JavaScript / TypeScriptReact / React Native / Next.jsNode.jsSupabasePostgreSQLRedisVercelAWSDockerKubernetesJenkinsTerraformRuby / Ruby on RailsKafkaReduxGitSentryAI workflows / LLM tooling
Experience
My career path
Senior Software Engineer
Klarna · 2021 — 2025
- Key architect and developer of a system at Klarna to proactively verify millions of customers, leading to improved UX and huge cost savings
- Built critical flows to allow customers to safely recover access to their Klarna Balance account (remote dynamic linking, letter send outs)
- Helped design and implement a new onboarding flow for the Klarna Balance product, increasing the product’s conversion rates by 4%
Software Engineer - Freelance
JLG · 2020 — 2021
- Conceived and developed a planning tool web application contracted for a top architecture firm in Belgium
- Worked in a team of 3 devs in order to respect the roadmap planned out in terms of feature releases
Projects
Selected work · built & shipped
Languages
Communication & global experience
English · NativeFrench · NativeItalian · ConversationalSpanish · ConversationalGerman · Conversational
Writing
Putting my thoughts into words
Your Codebase Has Technical Debt. But Does Your Team Have Comprehension Debt?
Comprehension debt is the gap between the current understanding of a codebase and the understanding needed to work effectively with it. It can lead to slower development, more bugs, and decreased team morale.
The 4 Cognitive Archetypes of Developers Using AI
A tracker to understand how AI usage shapes thinking, where it helps, and where it may quietly erode it.
See all writing here.
Hobbies & Fun Facts
My life outside of work
- Building in public
- Technical writing
- Running (ran Paris and Berlin Marathons)
- Reading
- Scuba Diving
- Kayaked around Corsica in 30 days
Get in Touch
Open to conversations
If something here resonates with you — whether it's engineering, reflection systems, AI workflows, or building thoughtful products — feel free to reach out.