Gilles Crofils

Gilles Crofils

Hands-On Chief Technology Officer

Tech leader who transforms ambitious ideas into sustainable businesses. Successfully led digital transformations for global companies while building ventures that prioritize human connection over pure tech.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.
November 2025 Launched Nook.coach. Where conversations shape healthier habits

Building a quiet legacy in tech

Abstract:

The article challenges the typical view of legacy in technology, arguing that lasting impact comes not from flashy titles, patents, or major product launches, but from the quieter, often invisible contributions like mentorship, team support, community building, and personal growth. Drawing on examples such as Margaret Hamilton’s leadership during Apollo 11, Jessie Frazelle’s work in container tech, and Sindre Sorhus’s dedication to open source, it shows how steady effort, ethical practice, and inclusive culture shape the field far more than individual accolades. The piece encourages tech professionals to rethink success by focusing on developing skills, finding satisfaction in meaningful work, and ensuring their efforts are sustainable. It recommends simple habits—like keeping a log of achievements, seeking peer feedback, and reflecting regularly—to help individuals recognize and build on their unique influence. Ultimately, the article advocates for a minimalist, values-driven approach to legacy, where the cumulative effect of small, consistent actions—teaching, guiding, supporting—creates a more authentic and enduring mark on technology than conventional markers of success.

What really lasts in tech? I used to think legacy meant having the big job titles, launching flashy products, or stacking up patents. These things look impressive on a CV, yes, but are they really everything? Over time, I’ve come to see that the real difference often happens quietly—through mentoring, shaping how teams work together, or building up a supportive community.

I want to share a more personal look at building a legacy beyond trophies. For me, the subtle, sometimes hidden ways we influence tech—like building skills, finding satisfaction in daily tasks, creating sustainable habits, and helping others grow—matter most. I’ve seen this in mentorship, in small but important contributions to open source, and in the steady efforts that keep projects moving, even when there are no big awards. I hope my reflections help you figure out your own impact and find ways to celebrate progress, even in the simplest moments.

Let’s see what shapes a true legacy, what really matters under the surface, and how even small actions can help your story grow over time.

Rethinking legacy in technology

Moving past the obvious markers

In tech, people talk a lot about legacy through job titles, patents, or big product launches. These look good on paper and make for easy conversation at events. But when I look closer, these things don’t always capture who really made a difference. So, what really shapes a legacy?

Take patents—sometimes, they are more about marking territory than sparking invention. Product launches grab attention, but I’ve noticed it’s usually the quieter things—like building systems that last or taking time to mentor—that drive real progress. And job titles? They rarely tell the whole story.

Titles can’t show the hidden work that supports teams, like mentoring new people or improving how everyone works together. These acts can shape what happens next, long after someone leaves. What if legacy was about actual impact, not just recognition?

I see a shift happening. More people around me value ethics, community, and keeping things healthy over chasing status. It’s becoming more common to measure legacy by the difference made, not by the public spotlight.

The many faces of lasting impact

Mentorship is a quiet force. I remember one heartfelt chat with a junior developer that changed their career path more than any product launch I’ve been part of. Open source works this way, too.

Even a small pull request or a helpful answer can strengthen tools and welcome newcomers. These little moments keep tech moving, even if nobody points them out. Community work matters just as much.

Supporting a community—maybe by answering questions, arranging meetups, or writing helpful guides—often has a bigger effect than technical wizardry. And sometimes, legacy is personal.

Personal growth—like learning new things, shifting how I think, or dusting myself off after a setback—has inspired others and changed team culture. If legacy isn’t about roles or fame, what really builds it?

The three S’s of legacy: skills, satisfaction, and sustainability

Building influence through skill development

For me, legacy starts with the skills I earn and quietly share—whether it’s technical know-how, empathy, or solving tricky problems. These talents don’t just show up in code; they reach into team habits and community practices long after a task is done. When I use clear communication or tackle problems calmly, it spreads. Teaching and mentoring stretch this even more.

Sharing what I know—through code reviews, patient explanations, or a helpful forum reply—might shape how others work for years. That’s the magic of multiplying impact: one idea at the right time can travel as others keep it moving. I like to keep a record, even if it’s just a few notes, to see how I’m growing.

When I founded my science popularization company, I thought the impact would come from the big events or the number of people reached. In reality, the most lasting effect came from the small habits—like making space for questions, or encouraging a shy team member to share their idea. Years later, I still see traces of those moments in how people approach new challenges.

Finding meaning and satisfaction in the work

Feeling good about my efforts is key for a lasting legacy. Work that matters—helping others, tackling real problems, or getting good at something—tends to stay in my memory longer than fancy titles. It’s like squashing a stubborn bug in code: there’s real joy, even if nobody else celebrates it. Sometimes, I notice that the satisfaction comes from the little things, not the big show.

From my experience managing multicultural teams, I’ve seen that what tech workers care about most is sharing knowledge, improving how things run, and mentoring others. These everyday wins often matter most:
- Helping someone figure out a sticky problem
- Making guides easier for new teammates
- Smoothing the onboarding process

I try to jot down these wins—a quick note in my journal or a message from a teammate—so I can notice what’s meaningful. Sometimes, I look at feedback or write a few lines about my day to spot what lights me up, so I can do more of it. Even a simple 360-degree review makes it easier to notice the best parts of my job. Of course, none of this works if it’s not sustainable.

Making impact sustainable

Legacy is a long game. I’ve learned (sometimes the hard way) that setting boundaries, finding a steady pace, and picking projects that line up with my values keep me effective for the journey. It’s a bit like watering a plant regularly, rather than drenching it once and forgetting it. I check in with myself now and then.

Looking back and asking for feedback lets me adjust as things change. That makes my impact flexible and in tune with my life. Some of the most important work is quiet and not very glamorous.

Things like improving documentation or supporting healthy communities rarely land you awards, but they keep teams growing strong. For example, the Linux kernel keeps running thanks to many who quietly review code and help each other. Quiet, daily support is often the foundation for work that lasts. Now, let’s see how this silent influence creates real legacies.

I’d be lying if I said I never worried about money or stability when I left a big company to start something new. The anxiety of leaving corporate comfort is real, and it took time to trust that steady, values-driven work would pay off—sometimes in ways I didn’t expect.

Invisible influence in shaping tech legacies

Quiet contributions that changed everything

Invisible teamwork packs as much punch as any headline win. Margaret Hamilton’s error-handling code saved the Apollo 11 mission, but her calm coaching and leadership also set the standard for modern software engineering. Sometimes, the biggest difference isn’t in the spotlight.

People who set the culture leave invisible footprints. The Linux kernel, for example, powers huge parts of the web because thousands of people pitch in quietly. Together, they show legacy is often about groups, not lone heroes.

Mentorship spreads in unexpected ways. Community leaders like Saron Yitbarek and Coraline Ada Ehmke changed tech by making everyone feel welcome, not just by writing lines of code. This shift in attitude often outlasts any tool or feature release.

Why does quiet work matter? Mentorship and guidance—like the help from Mike Krieger at Instagram—start a chain of support. As mentees move forward, the effect ripples through the industry.

Why behind-the-scenes work matters

Hidden tasks—reviewing code, writing better docs, supporting morale—keep teams humming and projects on track, even if few know who did them. These bits of effort hold everything together.

There are personal benefits too. People in these roles often feel more satisfied and less stressed, even if their work isn’t public. Focusing on these tasks can make daily work more enjoyable.

When quiet contributions get attention, everyone wins. It can create a healthier, more supportive idea of success. Legacy myths still stick around, but recognizing small daily wins is changing the picture.

Letting go of legacy myths

Rethinking what shapes a legacy

One big myth? Only lone geniuses matter. The tech world loves hero stories, but breakthroughs usually come from teams, not individuals. Progress is built by many hands working together.

Another myth is that legacy should be permanent. Stories often shine a light on a single person and ignore the deep effect of team dynamics and culture. The truth is, group effort and shared vision matter more in the long run.

Too many legacy stories leave some voices out. Chasing forever-lasting fame can make people burn out or miss the bigger picture. Most things in tech don’t last forever, anyway.

To move past these stories, I try to notice who’s left out—often women or folks from minority groups. Celebrating all types of contributions gives a fuller view of how progress happens.

Finding satisfaction in your own story

I used to compare my journey to famous names, and it was stressful—especially since a lot of truly important work happens quietly. When I moved from Berlin to Lisbon, I realized how much my sense of legacy and fulfillment changed. The slower pace, the chance to work with people from different backgrounds, and the freedom to choose my own projects made me see that satisfaction comes from inside, not from outside praise.

Letting go of myths about legacy frees me up. Working toward my own goals and what motivates me inside usually leads to more satisfaction and a stronger legacy. Lining up my work with my own values brings a kind of pride and endurance that fame alone can’t give.

With my background in both physics and business, I’ve noticed real breakthroughs and satisfaction rarely come from chasing outside praise. They develop from steady, values-driven effort, often in smaller, unexpected ways. Building my work around what feels right for me leads to more resilience and happiness over time.

Curating your impact portfolio

Mapping your influence

Seeing my true legacy means looking at all my efforts, not just the big, obvious ones. Small moments—like side projects, supportive chats, or helping untangle bugs—count just as much. When I take stock, I try to include:
- Projects (big or little)
- Times I gave informal mentorship
- Instances where I made team life smoother
- Moments of professional or personal growth

This kind of list shows off my full range, even what doesn’t fit on a CV.

I don’t use fancy tools. Sometimes it’s just a few notes in my phone or a page in my notebook. What matters is sticking to it—regular updates help me spot my evolving impact.

Peer feedback can highlight things I miss. A short conversation or a kind word from a teammate can reveal my value in unexpected ways.

Seeing all my actions mapped out helps me connect the dots. Bit by bit, every effort builds a stronger whole, like small bricks coming together.

I try to pause now and then to notice my progress. Looking back at my map reminds me every small action moves my legacy forward.

Celebrating cumulative impact

I set aside a moment each month or quarter to check my notes or feedback. This makes patterns clearer and lets me celebrate wins I might miss otherwise. A regular review—sometimes just a Sunday catchup—can show real growth.

I collect stories, notes, and lessons learned. Even a screenshot or a saved message makes my legacy feel more concrete.

Sharing privately with trusted friends or mentors adds encouragement and new perspectives. These connections often make my impact feel more real and appreciated.

As this record grows, it becomes a living story of my uniqueness—quiet but strong, always changing. My portfolio grows as my skills and adventures change.

Let’s see how this kind of impact shows up for tech professionals, and how patient, steady contributions can set the direction for what’s next.

Stories from the field

Mentorship and open source

Mentorship leaves big footprints. Jessie Frazelle’s steady work in container tech—through writing code, helping others, and encouraging inclusion—changed the field, even if you don’t hear her name everywhere. Her influence shows up in the tools people use every day.

Some leaders show strength quietly. Carol Willing’s passion for Python and Jupyter, plus her work mentoring newcomers and pushing for diversity, helped build welcoming spaces where technical skills and inclusivity both matter.

Fulfillment also comes from quiet excellence. Guido van Rossum, creator of Python, led by example—by mentoring and keeping community values strong, he shaped a culture where everyone can shine.

Fulfillment from quiet mastery

Teaching has rewards of its own. Sindre Sorhus looks after hundreds of npm packages, enjoying making open-source tools better and helping users, even if his name isn’t in lights.

Solving real problems matters too. Julia Evans makes zines that simplify complex concepts, focusing on learning and valuing feedback over chasing big awards.

Legacy never stands still. Pieter Levels, for example, builds useful tech for online communities, measuring his own progress by what he learns and which problems he solves—not just his audience size or press coverage.

Legacy as a living practice

Making legacy intentional

Legacy isn’t something I finish and put aside—it changes as I do. I try to keep things simple:
- Journaling, even just a few lines, helps me see what matters most.
- Checking my values and reviewing my goals keeps my impact lined up with what I care about.
- Dedicating a little time every month to reflect—big wins and small shifts—keeps things clear.

Getting feedback from peers or mentees illuminates stuff I might overlook. Even a short chat can help me notice growth that’s easy to miss day by day.

Updating my sense of legacy now and then—or just noting what season I’m in—helps my work and goals stay fulfilling. Keeping things minimal and light makes it easier to adapt as life and work shift.

Embracing minimalist legacy

For me, minimalist legacy is about going for quality impact, not chasing a checklist of achievements. It’s like tending a small, loved corner of a garden instead of trying to manage a whole city park. A little care goes a long way.

I find that simple routines—a quick monthly check-in, a light learning journal—keep my story visible but easy to manage. This flexibility makes sure my legacy matches my current life, always ready to adapt.

In the end, legacy comes from repeated, steady actions that match up with my own skills, values, and what brings me satisfaction. These quieter moments, stacked over time, shape tech in lasting ways—showing that the best legacy can be simple and steady, not loud or complicated.

A lasting mark in tech isn’t made with titles or attention-grabbing stunts—it’s about the steady, sometimes unseen contributions that build up teams, foster communities, and drive personal development. My own story, and those I admire, show that skills, satisfaction, and sustainability can matter just as much as major launches or patents. Supporting others, contributing to open source, or just helping out where I can sends ripples that last—even when no one is looking. With honest reflection and a focus on what truly matters, I find more meaning in my efforts than in chasing a pile of awards. Maybe give a thought to the small act or quiet contribution you feel proudest of—it could be the start of a much bigger legacy than you realize.

You might be interested by these articles:


25 Years in IT: A Journey of Expertise

2025-

Nook
(Lisbon/Remote)

Product Lead
Building the future of health coaching. Leading product development and go-to-market strategy for a platform that makes personal wellness accessible through natural dialogue.
Making health coaching feel like talking to a friend who actually gets you.

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

Cancel

Thank you !

Disclaimer: AI-Generated Content for Experimental Purposes Only

Please be aware that the articles published on this blog are created using artificial intelligence technologies, specifically OpenAI, Gemini and MistralAI, and are meant purely for experimental purposes.These articles do not represent my personal opinions, beliefs, or viewpoints, nor do they reflect the perspectives of any individuals involved in the creation or management of this blog.

The content produced by the AI is a result of machine learning algorithms and is not based on personal experiences, human insights, or the latest real-world information. It is important for readers to understand that the AI-generated content may not accurately represent facts, current events, or realistic scenarios.The purpose of this AI-generated content is to explore the capabilities and limitations of machine learning in content creation. It should not be used as a source for factual information or as a basis for forming opinions on any subject matter. We encourage readers to seek information from reliable, human-authored sources for any important or decision-influencing purposes.Use of this AI-generated content is at your own risk, and the platform assumes no responsibility for any misconceptions, errors, or reliance on the information provided herein.

Alt Text

Body