JAK Solutions
The agency focused on performance and custom development
Our goal is simple: to design robust, scalable and truly useful digital tools for your growth.
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Our agency at the gates of Brussels
Based in Wemmel, just outside Brussels, our web agency supports companies in the Brussels region with their web application development, website creation and custom digital solution projects.
Our strategic location allows us to stay close to our clients while providing an optimal working environment to design high performance and scalable solutions.
About our web agency
At JAK Solutions,
we are much more than a simple web agency.
We work on both corporate website projects and complex business applications as well as scalable SaaS platforms.
we focus on the performance, robustness and scalability of every digital solution.
Our commitment is simple: to design useful, high performance web solutions built to last.
Our core values
Technical excellence
Long term vision
Collaboration
Who are our clients?
Our role is to translate their business challenges into high performance, sustainable and value creating digital solutions.
Companies and SMEs
We step in when standard software reaches its limits and operational performance becomes a strategic challenge.
Non profit organizations
We design reliable solutions that are easy to maintain and built to last.
Startups
We combine strategic framing, a well controlled MVP and scalable architecture to accelerate the launch while securing the next phases of growth.
Independent professionals
We prioritize pragmatic, scalable solutions aligned with their business objectives.
At JAK Solutions, we support our clients with a demanding, structured approach focused on long term impact.
Meet our team
A clear mission:

Leadership

Kim Berthonneau
CEO / Solution Architect
Kim plays many roles at JAK Solutions. Usually, he's the first point of contact for prospects and clients, so chances are, your initial interactions will be with him. Blessed with a high degree of empathy, Kim has the unique ability to truly walk in your shoes and understand your needs at a fundamental level. His strong technical background equips him to convert your needs into customized digital solutions that fit your business like a glove.
Kim also has a passion for all activities related to boards. Don't be surprised if you spot him skateboarding down the street, snowboarding down a frosty mountain slope, or kitesurfing over the ocean waves in his free time.

Jon Pauwels
CTO / Lead Developer
Jon is the CTO at JAK Solutions. A true Swiss army knife, he blends strategic vision, team leadership, and technical expertise. He oversees the development team, structures projects, evolves the architecture, and still codes regularly, both in fullstack web and FileMaker development.
Analytical and naturally curious, he enjoys understanding how systems, technical or human, work at a deeper level. He places great value on code clarity, efficient processes, and healthy team dynamics. Outside of work, he plays padel weekly and spent many years playing chess, a game he still enjoys for its complexity and logic.

Andreas Couscouras
COO
An entrepreneur at heart, he joined JAK Solutions, drawn by the team’s quality standards and way of working. With solid experience in building and growing businesses, he now brings his strategic mindset and entrepreneurial vision to support JAK’s expansion.
As COO, he helps structure, organize, and optimize internal processes to drive the company’s sustainable and ambitious growth.
Our web experts

Corentin Grégoire
FullStack Developer
Since joining JAK, Corentin has quickly established himself as a key member of the team. His approach to development is both methodical and thoughtful: he pays close attention to every detail and never settles for anything less than excellence. Always seeking elegant and efficient solutions, he enjoys understanding the “why” behind every line of code and constantly strives to refine his methods.
Throughout various projects, Corentin has demonstrated strong adaptability, continuous technical curiosity, and a genuine commitment to quality work. He approaches each challenge with calm determination, and his high standards help raise the collective level of the team.
Behind his professional rigor lies a curious and passionate mind — someone who loves to learn, explore new technologies, and share his discoveries with others.

José Lopez Fernandez
Web Developer & SEO Specialist
Passionate about the digital world and equipped with strong expertise in web development and SEO, he supports businesses in creating high-performance, visually appealing, and strategically optimized websites that enhance their online visibility. Combining attention to detail, business insight, and creativity, he designs digital experiences that faithfully reflect each brand’s identity while maximizing their impact.
Committed to quality and close collaboration, he favors a results-driven approach where every project becomes an opportunity to create lasting value for his clients.

Dany Vanmuylder
FullStack Developer
Dany is a versatile and determined web/mobile developer who thrives on tackling challenges head-on. Known for his sociable and approachable nature, he brings a unique balance of professionalism and joyful collaboration to every project. His passion for coding goes beyond just work, he views it as a game, always looking for ways to optimize, innovate, and push his limits.
Outside of development, Dany is a competitive chess player with a strategic mindset, and a fan of various board games and video games. His love for these activities mirrors his approach to coding: patient, thoughtful, and always seeking the next move to gain an edge. Whether it's in development or in a game, Dany is someone you can count on to bring his best to the table.

Richi Nieto
Product Designer and Web Developer
Richi is a Product Designer and Web Developer passionate about creating beautiful and intuitive interfaces that seamlessly blend psychology and technology to deliver exceptional user experiences.
With over seven years of experience in a startup studio, he specializes in UX/UI design, branding strategy, and Code/No Code development. He enjoys helping startups grow, enhance their customer experience, and achieve their goals through smart and purposeful design.
A creative problem-solver by nature, he strives to find the perfect balance between best practices and the unique needs of each project.

Sebastien Vandaele
FullStack Developer
Sébastien is a passionate full-stack developer and tech lead who thrives on demanding projects that combine deep technical challenges with strong product vision. Curious and committed, he enjoys both designing robust backend architectures and refining seamless frontend experiences. His approach is driven by a constant pursuit of clarity, efficiency, and purpose — without ever giving in to unnecessary complexity.
Known for his analytical mindset, direct communication style, and subtle sense of humor, Sébastien brings thoughtful energy and a drive for excellence to every team. An entrepreneur at heart, he is always exploring new ideas, especially around artificial intelligence and automation. For him, code is a tool for impact — a playground where rigor, boldness, and the joy of building come together.
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Arnaud Vanderschrieck
FullStack Developer
Arnaud is a creative full stack developer who sees every line of code as an opportunity to innovate. In his day to day work at JAK Solutions, he skillfully balances building new features with solving complex bugs, showing remarkable agility. For him, coding is not just about writing instructions, it is a creative process where the elegance of a solution matters just as much as its efficiency.
Driven by curiosity and a strong aesthetic sense, he enjoys adding a visual and intuitive dimension to the projects he works on. His ability to visualize solutions even before implementing them allows him to turn technical challenges into smooth, user friendly experiences.
Administration

Sophia Pratsas
Executive Assistant
With a strong sense of organization and an unwavering commitment to excellence, she ensures the team runs smoothly every day. Her background in entrepreneurship and customer service brings valuable perspective and drive to her role. She combines efficiency with a natural sense of empathy.
Beyond her operational role, she embodies the balance between structure and warmth that defines our culture. Her proactive mindset, reliability, and positive energy make her an essential point of support for both management and the wider team.
Our talents

Mehdi El Mestari
Intern
Mehdi is a curious and level headed web developer, driven by a genuine desire to learn and grow. At JAK Solutions, he approaches each new challenge with calm, method and an open mindset, whether it is discovering new tools or understanding technical problems.
Drawn to adventure and exploration, he enjoys stepping outside his comfort zone, an approach he naturally brings into his work. Hiking, running, travel and off the grid experiences fuel his perseverance and endurance, qualities that shape his journey as a developer and his role within the team.

Victor Castelain
intern
Victor is a final-year management IT student completing his internship at JAK Solutions. Methodical and hardworking, he has a natural ability to ask the right questions, understand the bigger picture, and get up to speed fast, qualities that made him feel like part of the team almost immediately.
At JAK, he is strengthening his skills in .NET and expanding into React, with the goal of contributing to real projects and meaningful challenges. His approach to development mirrors the way he tackles everything else: with patience, structure, and a steady drive to improve.
Outside of work, Victor recharges through rock climbing and running, two disciplines that reflect his mindset well. And if 40 days backpacking across Asia taught him anything, it's that the best way to grow is to embrace the unknown head-on.








