I bring over 15 years of experience in developing modern, globally competitive web and mobile solutions that deliver an exceptional user experience. I can work autonomously to deliver complete products or seamlessly integrate with your team. My expertise spans backend, frontend, and mobile app development across multiple paradigms, servers, browsers, and various languages and frameworks. I excel at identifying potential issues early, addressing root causes, and ensuring strong test coverage to maintain adaptable applications. I always keep a user-centered mindset, focusing on real needs, prioritizing simplicity and clarity, and breaking down complex applications into manageable parts. Beyond technical skills, I foster a supportive and enjoyable work environment and actively contribute to open-source projects.

Mathieu Decaffmeyer

I bring over 15 years of experience in developing modern, globally competitive web and mobile solutions that deliver an exceptional user experience. I can work autonomously to deliver complete products or seamlessly integrate with your team. My expertise spans backend, frontend, and mobile app development across multiple paradigms, servers, browsers, and various languages and frameworks. I excel at identifying potential issues early, addressing root causes, and ensuring strong test coverage to maintain adaptable applications. I always keep a user-centered mindset, focusing on real needs, prioritizing simplicity and clarity, and breaking down complex applications into manageable parts. Beyond technical skills, I foster a supportive and enjoyable work environment and actively contribute to open-source projects.

Available to hire

I bring over 15 years of experience in developing modern, globally competitive web and mobile solutions that deliver an exceptional user experience. I can work autonomously to deliver complete products or seamlessly integrate with your team. My expertise spans backend, frontend, and mobile app development across multiple paradigms, servers, browsers, and various languages and frameworks.

I excel at identifying potential issues early, addressing root causes, and ensuring strong test coverage to maintain adaptable applications. I always keep a user-centered mindset, focusing on real needs, prioritizing simplicity and clarity, and breaking down complex applications into manageable parts. Beyond technical skills, I foster a supportive and enjoyable work environment and actively contribute to open-source projects.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
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Language

English
Fluent
French
Fluent
Dutch
Advanced

Work Experience

Full-Stack Software Developer at Subtile
February 28, 2024 - July 11, 2025
Developed a finance tracking tool for NGOs from scratch, covering backend, frontend development, UI/UX design, and deployment.
Full-Stack Software Developer at Subtile
February 28, 2024 - July 11, 2025
Developed a finance tracking tool for NGOs from scratch, covering backend, frontend development, UI/UX design, and deployment.
Full-Stack Software Developer at Subtile
February 28, 2024 - July 11, 2025
Developed a finance tracking tool for NGOs from scratch, covering backend, frontend development, UI/UX design, and deployment.
Full-Stack Software Developer at Nexis
February 1, 2024 - Present
Develop and enhance a SaaS application for pest control companies, enabling agents to efficiently manage schedules and routes, and allowing sales teams to track leads and revenue.
Full-Stack Software Developer at Nexis
February 1, 2024 - Present
Develop and enhance a SaaS application for pest control companies, enabling agents to efficiently manage schedules and routes, and allowing sales teams to track leads and revenue.
Full-Stack Software Developer at Nexis
February 1, 2024 - Present
Developed and enhanced a SaaS application for pest control companies, enabling agents to efficiently manage schedules and routes, and allowing sales teams to track leads and revenue.
Full-Stack Software Developer at DeeMoney
March 31, 2023 - July 11, 2025
Evaluated application complexity and new developer onboarding challenges. Recommended improvements and reported on technical debt's business impact to the CTO and founders. Provided coaching on design principles and best practices.
Full-Stack Software Developer at DeeMoney
March 31, 2023 - July 11, 2025
Evaluated application complexity and new developer onboarding challenges. Recommended improvements and reported on technical debt's business impact to the CTO and founders. Provided coaching on design principles and best practices.
Full-Stack Software Developer at DeeMoney
March 1, 2023 - July 11, 2025
Evaluated application complexity and new developer onboarding challenges. Recommended improvements and reported on technical debt's business impact to the CTO and founders. Provided coaching on design principles and best practices.
Full-Stack Software Developer at CitizenLab
November 30, 2021 - July 11, 2025
Developed a real-time application to increase citizen involvement in government projects, enabling discussions, voting, and idea sharing via video conferencing and interactive forms.
Full-Stack Software Developer at CitizenLab
November 30, 2021 - July 11, 2025
Developed a real-time application to increase citizen involvement in government projects, enabling discussions, voting, and idea sharing via video conferencing and interactive forms.
Full-Stack Software Developer at CitizenLab
November 30, 2021 - July 11, 2025
Developed a real-time application to increase citizen involvement in government projects, enabling discussions, voting, and idea sharing via video conferencing and interactive forms.
Full-Stack Software Developer at Multipharma
March 31, 2019 - July 11, 2025
Developed a React-based stock management app from scratch to efficiently track and manage daily medication packets for rest home clients. Built various internal-use web apps to optimize pharmacists’ internal workflows and processes.
Full-Stack Software Developer at Multipharma
March 31, 2019 - July 11, 2025
Developed a React-based stock management app from scratch to efficiently track and manage daily medication packets for rest home clients. Built various internal-use web apps to optimize pharmacists’ internal workflows and processes.
Full-Stack Software Developer at Multipharma
March 31, 2019 - July 11, 2025
Developed a React-based stock management app from scratch to efficiently track and manage daily medication packets for rest home clients. Built various internal-use web apps to optimize pharmacists’ internal workflows and processes.
Full-Stack Software Developer at ING
April 30, 2017 - July 11, 2025
Migrated ING’s website to a modern, responsive design for improved user experience and accessibility.
Full-Stack Software Developer at ING
April 30, 2017 - July 11, 2025
Migrated ING’s website to a modern, responsive design for improved user experience and accessibility.
Full-Stack Software Developer at ING
April 30, 2017 - July 11, 2025
Migrated ING’s website to a modern, responsive design for improved user experience and accessibility.
Full-Stack Software Developer at Multipharma
January 31, 2017 - July 11, 2025
Refactored critical legacy, buggy applications for the delivery of daily medication packets to rest home patients, ensuring each packet’s content and timing are accurate. Built various internal-use web apps to optimize pharmacists’ internal workflows and processes.
Full-Stack Software Developer at Multipharma
January 31, 2017 - July 11, 2025
Refactored critical legacy, buggy applications for the delivery of daily medication packets to rest home patients, ensuring each packet’s content and timing are accurate. Built various internal-use web apps to optimize pharmacists’ internal workflows and processes.
Full-Stack Software Developer at Multipharma
January 31, 2017 - July 11, 2025
Refactored critical legacy, buggy applications for the delivery of daily medication packets to rest home patients, ensuring each packet’s content and timing are accurate. Built various internal-use web apps to optimize pharmacists’ internal workflows and processes.
Full-Stack Software Developer at Freelance
December 31, 2015 - July 11, 2025
Built presentation websites for clients in various sectors. Developed an application for doctors, enabling online appointment bookings and automated email and SMS reminders for patients.
Full-Stack Software Developer at Freelance
December 31, 2015 - July 11, 2025
Built presentation websites for clients in various sectors. Developed an application for doctors, enabling online appointment bookings and automated email and SMS reminders for patients.
Full-Stack Software Developer at Freelance
December 31, 2015 - July 11, 2025
Built presentation websites for clients in various sectors. Developed an application for doctors, enabling online appointment bookings and automated email and SMS reminders for patients.
Full-Stack Software Developer at Fortis Bank
January 31, 2008 - July 11, 2025
Developed an internal Java web application for booking seats on a private airplane shuttle between Brussels and Luxembourg, featuring seat selection and flight scheduling.
Full-Stack Software Developer at Fortis Bank
January 31, 2008 - July 11, 2025
Developed an internal Java web application for booking seats on a private airplane shuttle between Brussels and Luxembourg, featuring seat selection and flight scheduling.
Full-Stack Software Developer at Fortis Bank
January 31, 2008 - July 11, 2025
Developed an internal Java web application for booking seats on a private airplane shuttle between Brussels and Luxembourg, featuring seat selection and flight scheduling.
Full-Stack Software Developer at Ebuco
June 30, 2006 - July 11, 2025
Created an app for remote management of digital displays in businesses, featuring easy upload and scheduling of ads and media and real-time updates.
Full-Stack Software Developer at Ebuco
June 30, 2006 - July 11, 2025
Created an app for remote management of digital displays in businesses, featuring easy upload and scheduling of ads and media and real-time updates.
Full-Stack Software Developer at Ebuco
June 30, 2006 - July 11, 2025
Created an app for remote management of digital displays in businesses, featuring easy upload and scheduling of ads and media and real-time updates.

Education

Bachelor’s Degree at Institut Paul Lambin, Brussels
October 1, 2003 - June 30, 2006
Bachelor’s Degree at Institut Paul Lambin, Brussels
October 1, 2003 - June 30, 2006
Bachelor’s Degree at Institut Paul Lambin, Brussels
October 1, 2003 - June 30, 2006

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Financial Services, Healthcare, Government, Non-Profit Organization, Retail, Transportation & Logistics