Julien's DevRel corner

kotlin Featured

KotlinConf 2025 is a real bowl of fresh air for backend Devs

With their keynote that JetBrains intentionally started putting backend developers in the spotlight again. They made big, impactful announcements, both at an ecosystem and language levels and I can't wait to try out all of the new goodies.

ai Featured

My experience using Junie for the past few months

Junie is one of the best coding agent I've been trying out so far. Very well integrated with IntelliJ, great for Kotlin, and the test first focus makes it quite good at coming out with good results. However, I do miss the capability to only accept part of a solution and it can be very slowwwwww.

devrel

You probably shouldn't hire a Developer Advocate yet

Many companies with job ads out for Developer Advocates don't know that's not what they should be hiring for (yet). More often than not, what they need first is some internal mindset change. And even then, a Developer Experience will go a long way to achieve the first stages of a healthy community.

remarkable

Impressions on the remarkable 2, one month in

This article describes my experience with the Remarkable 2 after a month of usage. I am generally happy with it, though many things are lacking in my opinion.

kotlin

Hosting Kotlin applications using Coolify

TL;DR : With Coolify you can host you Kotlin applications in seconds on your own server and benefit from auto deploys, custom domains, preview branches and more. You can see the code here, and access the sample here.

kotlin

🎉Celebrating Kotlin 2.0🎉

Upgrading a simple Kotlin and PicoCLI project to Kotlin 2.0 in under 5 minutes to celebrate the new version coming up!

electric

A retrospective on getting solar panels installed

A retrospective on getting solar panels installed. The installation cost around 5k€ (4k€ after government subsidies), and we were able to generate over 80% of our yearly consumption and save just short of 1k€ in year 1 as well as shave off our CO2 footprint by over a ton

devrel

Visualizing your AAARRP priorities as a way to manage up in your DevRel team

In this article, I'm describing how we used the AAARRRP framework to visually describe our DevRel team's strategy and clarify the reason for our day to day activities to our internal stakeholders, and more focus on impact instead.

openapi

Creating an OpenAPI generator from scratch : From YAML to JetBrains HTTP Client

In this article, I'll be implementing an openapi generator from scratch so you can too! We'll be creating a very simple generator for the Jetbrains HTTP Client

kotlin

[Unit] Testing Supabase in Kotlin using Test Containers - PART 2

In this article we continue diving into TestContainers and Supabase, and run unit tests against a full local self-hosted Supabase.

supabase

[Unit] Testing Supabase in Kotlin using Test Containers

In this article, I'll dive into several methods I've been looking into to unit test a Kotlin application using Supabase and why I finally decided to go for a Docker Compose / Test Containers solution.

devrel

Thoughts on the Climate crisis and being a Developer (Advocate)

It's quite clear by now that we humans have a strong impact on the Earth's climate. As a new developer advocate, my impact on the world around me is something I have in the back of my head pretty much every day. I want to go with you through some of this today.

kotlin

My KotlinConf experience

My experience and impressions attending KotlinConf a couple weeks back. And some thoughts on the future of Kotlin.

apis

Replacing Postman with the Jetbrains HTTP Client

This blog shows a way to use the Jetbrains HTTP Client to replace Postman and test third party APIs, share requests and even run them in CI all of that within minutes!

community

2022 retro, and what's up

This post is a recap of 2022, and a look into what's coming in 2023. In short, Devrel is amazing and doesn't require flying, I became a GDE and we grew over 160kg of vegetables this year!

apis

A tale of fixing a tiny OpenAPI bug

I found and fixed a tiny bug in OpenAPI, learnt about the library, jackson and git in the process. In short, get and set methods are visited by Jackson even when they aren't used anywhere in the code! Be careful how you name your methods 🔥

java

Getting started with OpenAPI Generators : tips and tricks

In this article, I'm sharing some tips and tricks on how to get productive with creating OpenAPI generators. How to run and debug, create your own easily and more

dei

Things I've learnt about inclusion in Tech

In this post, I'll discuss things I see, and things I try to do to "do my part" (for the lack of a better word) at work and outside of it. I'm not an example, but maybe you can find inspiration yourself (and teach me some more!).

development

Why I still take notes on paper

Why I still take notes on paper every day. Let's dive a bit into why it works for me, in no particular order.

kotlin

Kotlin Data Classes, shallow copies and immutability

Are Kotlin data classes immutable? And does the copy method create shallow or deep copies of my class instances? Let's have a look together

elm

Easy dependency integration in Kotlin/JS using the "Elm ports" technique

Just starting with Kotlin/JS, I found it hard to use large NPM libraries like Firebase. But my past experiences with Elm and its system of ports helped me find a suitable solution. Let's dive into it!

kotlin

Tips and tricks using Hibernate and SQLite with Kotlin

This blog exposes some of the things I've found out while implementing my project. Maybe they're useful for someone else too :). Kotlin, Hibernate and SQLite doesn't seem to be a very present combination online as of now.

kotlin

Measuring time and durations in Kotlin

The DurationAPI is coming out of experimental stage, and offers a nice DSL to easily work with Time durations (duh!). If offers the obvious but also nice extra goodies like coercions and ISO/ String conversions and is notably used to calculate processing time.

kotlin

Kover : Code Coverage plugin for Kotlin

Kover is a code coverage tool for Kotlin. It's still in incubator phase but I took it for a spin and it is already very useful as part of local or CI workflows! In this article I go through the setup and some of my favourite goodies of the tool.

hacktoberfest

Automatically add the Hacktoberfest tag to all of your GitHub repositories

I created a small kotlin utility that finds all the repositories you are an owner of, and add the Hacktoberfest topic to them :) and learnt a few things