Gilles Crofils

Gilles Crofils

Hands-On Chief Technology Officer

Based in Western Europe, I'm a tech enthusiast with a track record of successfully leading digital projects for both local and global companies.1974 Birth.
1984 Delved into coding.
1999 Failed my First Startup in Science Popularization.
2010 Co-founded an IT Services Company in Paris/Beijing.
2017 Led a Transformation Plan for SwitchUp in Berlin.
May 2025 Eager to Build the Next Milestone Together with You.

Modernizing Legacy C++ Codebases

Abstract:

Legacy C++ systems are prevalent in various industries due to their stability, but integrating and maintaining them with modern technology poses challenges. Refactoring the C++ code is crucial for improving maintainability, scalability, and extensibility. However, this process requires a balance between preserving stability and integrating modern design principles. Modernization strategies for C++ legacy systems require collaborative efforts and a thorough understanding of business objectives, risks, and available resources. Effective legacy code maintenance is vital to prevent technical debt and ensure seamless system integration. Technology and engineering leaders play a key role in driving C++ modernization initiatives, ensuring alignment with business goals for long-term success and sustainability.

Create an abstract image that represents the task of updating old C++ systems. Use shades of blue to signify stability and innovation. The image should contrast the past and future, showing a bridge built from computer code and digital elements. It should seamlessly link a sturdy, traditional C++ composition on one side with a streamlined, futuristic tech interface on the other. Incorporate symbols of cooperation and strategic planning such as interconnecting jigsaw pieces or harmoniously intertwining cogs. These symbols should denote the thoughtful planning and teamwork that is crucial for successful integration. Represent the equilibrium between maintaining the system's integrity and introducing modern design approaches, perhaps using the visual metaphor of a balance, with pieces of code and modern digital icons as counterweights. This illustration should sum up the progression from traditional to modern in the technology world, underscoring the significance of preserving the core while welcoming change.
Modernizing Legacy C++: A Comprehensive Guide for Technology and Engineering Leaders

Legacy C++ Systems: Understanding the Past to Build the Future

Legacy C++ systems represent a substantial portion of technology and engineering infrastructure across various industries. These systems, despite their age, exhibit remarkable resilience and stability, which is why organizations have been reluctant to abandon them. However, as technology advances at an accelerated pace, it becomes increasingly difficult to integrate and maintain these legacy systems, thereby hindering innovation and operational efficiency.

C++ Code Refactoring: Balancing Change and Stability

C++ code refactoring is an essential modernization strategy to improve and optimize existing C++ codebases. Refactoring offers the advantage of retaining original functionality while enhancing maintainability, scalability, and extensibility. However, this approach requires a delicate balance between preserving the code's stability and incorporating modern design principles and techniques. A comprehensive understanding of C++ best practices and current engineering trends is crucial for a successful refactoring process.

C++ Legacy Systems Modernization Strategies: A Collaborative Effort

Modernizing C++ legacy systems is not a one-size-fits-all endeavor. Successful modernization strategies involve a thorough assessment of the current system and a clear understanding of business objectives, risks, and desired outcomes. Collaboration between CTOs, Directors of Technologies, and Directors of Engineering ensures a holistic, consensus-driven approach to modernization. It is essential to consider factors such as available resources, in-house expertise, potential disruptions, and long-term sustainability when outlining and implementing modernization strategies.

Legacy Code Maintenance: Fostering Continuously Improving Environments

Effective legacy code maintenance is crucial to prevent technical debt and to ensure seamless system integration while minimizing potential disruptions. By encouraging a blame-free, continuous improvement environment, organizations can promote active engagement from development teams and establish a culture of shared responsibility for code quality, maintainability, and extensibility. In this context, ongoing refactoring and regular code reviews become integral components of the organizational technology strategy.

Empowering Technology and Engineering Leaders: Crafting the Future of C++ Modernization

Technology and engineering leaders, including CTOs, Directors of Technologies, and Directors of Engineering, are uniquely positioned to drive C++ modernization initiatives and shape the future of their organizations. Building on their expertise and employing a forward-thinking, collaborative approach, these leaders can ensure that modernization efforts are innovative, strategic, and aligned with broader business goals. As a result, organizations will be better equipped to capitalize on new opportunities and meet the evolving needs of customers and stakeholders, thus driving long-term success and sustainability in technology and engineering.

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25 Years in IT: A Journey of Expertise

2024-

My Own Adventures
(Lisbon/Remote)

AI Enthusiast & Explorer
As Head of My Own Adventures, I’ve delved into AI, not just as a hobby but as a full-blown quest. I’ve led ambitious personal projects, challenged the frontiers of my own curiosity, and explored the vast realms of machine learning. No deadlines or stress—just the occasional existential crisis about AI taking over the world.

2017 - 2023

SwitchUp
(Berlin/Remote)

Hands-On Chief Technology Officer
For this rapidly growing startup, established in 2014 and focused on developing a smart assistant for managing energy subscription plans, I led a transformative initiative to shift from a monolithic Rails application to a scalable, high-load architecture based on microservices.
More...

2010 - 2017

Second Bureau
(Beijing/Paris)

CTO / Managing Director Asia
I played a pivotal role as a CTO and Managing director of this IT Services company, where we specialized in assisting local, state-owned, and international companies in crafting and implementing their digital marketing strategies. I hired and managed a team of 17 engineers.
More...

SwitchUp Logo

SwitchUp
SwitchUp is dedicated to creating a smart assistant designed to oversee customer energy contracts, consistently searching the market for better offers.

In 2017, I joined the company to lead a transformation plan towards a scalable solution. Since then, the company has grown to manage 200,000 regular customers, with the capacity to optimize up to 30,000 plans each month.Role:
In my role as Hands-On CTO, I:
- Architected a future-proof microservices-based solution.
- Developed and championed a multi-year roadmap for tech development.
- Built and managed a high-performing engineering team.
- Contributed directly to maintaining and evolving the legacy system for optimal performance.
Challenges:
Balancing short-term needs with long-term vision was crucial for this rapidly scaling business. Resource constraints demanded strategic prioritization. Addressing urgent requirements like launching new collaborations quickly could compromise long-term architectural stability and scalability, potentially hindering future integration and codebase sustainability.
Technologies:
Proficient in Ruby (versions 2 and 3), Ruby on Rails (versions 4 to 7), AWS, Heroku, Redis, Tailwind CSS, JWT, and implementing microservices architectures.

Arik Meyer's Endorsement of Gilles Crofils
Second Bureau Logo

Second Bureau
Second Bureau was a French company that I founded with a partner experienced in the e-retail.
Rooted in agile methods, we assisted our clients in making or optimizing their internet presence - e-commerce, m-commerce and social marketing. Our multicultural teams located in Beijing and Paris supported French companies in their ventures into the Chinese market

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