Portrait of Jelle De Laender

Jelle De Laender

Entrepreneur • Software Developer • Security Leader

What I do

Founder of Coding Mammoth

We help SaaS companies stay in control through cybersecurity leadership and hands-on delivery. As a virtual CISO, we guide ISO 27001 implementation, run internal audits, and build the security foundations teams need to scale with confidence.

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Creator of Semonto

Semonto keeps an eye on your websites 24/7 and alerts you when something fails, so you can fix issues before anyone notices. It covers uptime, broken links, SSL checks, and Lighthouse performance monitoring in one place.

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About me

I guess it’s no exaggeration to say that I knew early on what my passion was. I started coding when I was 14 years old and founded Coding Mammoth when I was still in college at the University of Ghent. At first, the software products I developed were mainly for myself. For example, while working on one of my first projects, I got super annoyed that the server I used kept going offline without any notice. So, I created a software application called Semonto that would send me a warning every time that happened. Fast-forward to 12 years later, and today Semonto is our most popular product. Coding Mammoth has grown into a cybersecurity agency with its headquarters in Antwerp, focused on helping SaaS companies stay in control. I can’t wait to see what the future brings. You can find my experience and projects on my LinkedIn profile.

Previous roles

2008 - Present

Coding Mammoth

Founder

Built a cybersecurity agency delivering virtual CISO support, ISO 27001 programs, and internal audits for SaaS companies.

2008 - Present

Semonto

Creator

Launched Semonto, a Technical SEO platform covering website outages, broken links, SSL monitoring, Google Lighthouse tracking, and more.

2013 - 2025

Sketch

Software Engineer → Cloud Project Manager → Head of Security.

Worked across engineering, cloud delivery, and security leadership to help the product scale.

Sep 2014 - Apr 2019

Co-Founder, Wingman (deltaRocket)

DeltaRocket designed a new type of 3D printer. I supported marketing and helped evolve the website with new ideas and concepts.

Nov 2013 - Oct 2014

Freelance Software Developer, 10Forward

Built tools to sync data between 10Forward Th!nx and ERP solutions like Deltek Maconomy.

Feb 2012 - May 2014

iOS Developer, Mondial Telecom

Maintained and integrated features for the in-house iOS VoIP app (4Talk) and client apps like Telenet Triiing and Virgin Media (UK) SmartCall, with a focus on networking, threading, and memory management.

Sep 2010 - Apr 2011

iOS Developer, Digitmedia

Supported the development of DeMorgen, Le Soir, and other iPad apps for De Persgroep, with a focus on performance optimization.

Education

2023 - Master of Science (MSc)

Software Engineering

2017 - Bachelor of Science (BSc)

Computer Science

Want to collaborate?

Latest blog posts

Fresh notes on security, UX, work, nerdy deep dives, and sport.

My personal tips for working from home

My personal tips for working from home

Remote working and working from home are completely two different concepts. Remote working is working from home, but also coworking spaces…

Read My personal tips for working from home

Let’s connect

Fastest response: email. For a quick hello, LinkedIn works great too.