By Mehdi Boissat-Bron (Backend Developer) Morpheus is a team that mainly develops internal systems for professional customers to enable them to post their classified ads on leboncoin and the other sites of the leboncoin group. And like most of the technical teams here, it has faced a transformation a few…

By Thibaut Sabot (Lead Frontend Developer) It’s no secret that Web performance plays an important role in a website’s success. You probably heard about the stories of Walmart that increased their conversion rate by 2% for every less second their page would take to load. That Amazon would lose 1.6…

By Nicolas Goll-Perrier (Lead Data Engineer) For the last 15 years, leboncoin has been providing classified ads service in France, growing up to its current size hosting more than 40 Million ads in 70+ categories — ranging from real-estate to video games — and serving 30 Million active users every…

By Nicolas Beguier & Fabien Martinez — Offensive & Defensive Security Engineers Not everyone is an AWS expert. The CLI is good to find something specific, but finding misconfiguration or vulnerabilities is really hard. The web interface is probably more intuitive, but it’s unrealistic to build some automation on the…

By Jérémy Smadja (DevOps/SRE) An “expected” journey… 33 000 000 is the approximate number of ads available on leboncoin.fr. Because a classic user search cannot always be matched with perfectly relevant ads during a session, it is very helpful to build a recommendation system to automatically expose ads based on the user ad…

By Christian Kula (Android developer) For this second part of our series of Our Day-to-Day Guide to Productivity for Android developers, let’s talk about Code Editor and Git tips and tricks. You may know some, you may not know others. In any case, feel free to share them! Android Studio Since we…

By Nicolas Béguier (Offensive & Defensive Security Engineer) Static Application Security Testing (SAST) is a set of technologies designed to analyze application and design conditions that indicate security vulnerabilities. SAST solutions analyze an application in a state of non-execution. Working in a white box environment provides a better understanding of…

By Thibaut Sabot (Lead Frontend Engineer) Over the years, web users’ needs and expectations changed. Nowadays we expect a highly responsive, good-looking and attractive website. “It just works” is far from being enough anymore. Technically, leboncoin.fr is nothing like the old version that we started 15 years ago. We kept…

By Christian Kula (Android developer) The ever growing leboncoin’s user base requires us to be more effective in order to be able to deliver new features quickly. Tools, frameworks and languages are constantly evolving so it’s important for us to choose wisely in order to improve our development workflow. In…