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

Making tech transitions easier with personal energy mapping

Abstract:

The article advocates for using personal energy mapping as a practical strategy to navigate the stressful transitions common in tech careers, such as job exits or major role changes. It emphasizes shifting away from rigid, task-focused schedules toward recognizing and aligning work with natural fluctuations in physical, mental, and emotional energy throughout the day. By journaling or using digital tools to track energy levels, tech professionals can plan demanding tasks, like handovers or critical meetings, during their high-energy periods and reserve low-energy times for routine or restorative activities. The article offers both digital and analog methods for energy tracking, supporting minimalism and mental well-being, and illustrates the approach with real-world examples, including a senior developer who successfully used energy mapping to make their exit less exhausting and more effective, and personal anecdotes from the author’s own career in Berlin and Lisbon. Ultimately, the article presents energy mapping as a flexible, sustainable routine that helps professionals manage workload and emotions during transitions, reduce burnout risk, and maintain work-life balance by integrating rest and self-checks into both team environments and independent work.

Transitions in tech never feel simple for me. The pressure to finish strong, hand over knowledge, and avoid burnout—while emotions run high—has left me stretched more than once. I’ve tried squeezing tasks into rigid schedules, but that only led to stress and overwhelm, especially during big exits or career changes.

Instead, I’ve learned to rely on personal energy mapping. Rather than packing every minute with productivity, I focus on when I naturally feel focused or worn out, so I can tackle important work when I have the most energy. In this piece, I’ll share what energy mapping means for me, why it matters for tech exits, and how I track my patterns using simple tools. I’ll walk through frameworks for mapping energy, building a transition plan that matches my rhythm, and using digital or paper methods to keep things human.

Throughout, I’ll share stories from my own career—whether leading a multicultural team in Beijing or shifting to a slower pace in Lisbon—to show how this approach can lighten tough changes. My goal is to offer down-to-earth advice and routines that help work and well-being stay connected, even in the mess of career transition. If you’re searching for a more balanced way to move on from your tech job, here are the steps and tools that have made my own exits smoother and less draining.

understanding energy mapping

what is personal energy mapping?

Personal energy mapping, for me, is a way to track my physical, mental, and emotional energy throughout the day or week. Instead of counting hours or making endless to-do lists, I pay attention to when I feel sharp or tired. By noticing these natural patterns, I can match my most important tasks to times when I have the most focus, and save lighter work for when my energy dips. This approach has been especially useful as I moved from strict routines in Berlin to more self-led schedules in Lisbon. Energy mapping isn’t about cramming more productivity into the day—it’s about doing my best work at the right times.

When I was recovering from burnout after a long stint in cross-border e-commerce, knowing my energy cycles was a lifesaver. I stopped obsessing over hours worked and started making the most of my good moments. Respecting these patterns lowered my risk of burnout and brought me closer to balance.

During big transitions, like leaving a tech job, this becomes even more useful. If I align my most critical activities—knowledge handoffs, documentation, or goodbye talks—with my focused periods, things move along with less stress. For example, I’ll plan handover meetings and write documentation in my sharpest hours, and leave routine admin or file organizing for when I’m running on fumes.

why energy awareness matters for tech exits

Notice periods and exits have always come with mental overload, shifting feelings, and the risk of checking out before the end. If I plan only around tasks, without considering my energy highs and lows, things get worse. I’ve seen in both my own work and in studies that planning with energy patterns in mind reduces stress and makes exits smoother.

Doing high-impact tasks during my energy peaks leads to better handovers and fewer mistakes. Taking breaks when my energy drops cuts down on fatigue. This fits with my minimalist mindset—cutting out what I don’t need and focusing on essentials.

For those of us who crave autonomy, energy mapping clears away pointless steps and opens up space for real progress. It’s made my own exits less exhausting. But how do I actually spot my own patterns?

recognizing and mapping my energy patterns

practical ways I track daily energy

I usually start by keeping a short journal for a week or two. At certain times each day—morning, midday, afternoon, evening—I jot down a number (1 to 10) or a word about how I feel. No need for perfection. Even quick notes reveal trends. Here’s how I do it:

  • Pick four moments during the day (after waking, midday, late afternoon, evening).
  • Rate my energy each time or write a quick word, like “sharp,” “foggy,” or “wired.”
  • Repeat daily for at least a week.

If I’m feeling visual, I’ll use a heatmap or bar chart—sometimes just colored blocks in a notebook, sometimes a quick spreadsheet. This makes it easy to spot my good and bad times. My background in physics and analytics comes in handy here: I’ll sometimes calculate an average energy score for each time block, which helps me see patterns more clearly.

Digital tools can help too. I’ve used Daylio and Notion templates to automate tracking and visualize trends. My smartwatch adds sleep and movement data, but honestly, my own notes give the best clues for planning a smooth exit. After a week or two, I review the results and notice where my energy peaks and dips.

finding my best and lowest energy windows

Looking over my journal, certain times always pop out as my peaks—often late morning or early afternoon, but it varies. I mark these moments clearly in my system. That’s when I schedule hard or creative work. My low periods matter just as much.

I use my low-energy times for easy admin, clearing my inbox, or stepping out for a walk. Respecting these downs helps me avoid overloading myself and keeps burnout at bay. For example, if I crash in early afternoons, I’ll use that time for organizing files or quick follow-ups. Late evenings, when my brain is mush, are for gentle reading or reflection. During the after-lunch dip, I’ll take a short walk or a real break instead of forcing myself through hard tasks.

Honoring these slow spots keeps my plans realistic. When I led a team in Berlin, I’d use my morning peaks for deep work like coding or preparing detailed handover docs, then switch to lighter admin in the late day. Matching my work to my energy, not the clock, made transitions feel lighter. Once I’ve mapped my patterns, I’m ready to build an exit plan that fits my energy.

building my energy-informed exit roadmap

combining energy patterns with my exit plan

Now that I can see my peaks and lows, I combine this knowledge with my exit checklist or calendar. I mark my prime windows on my planner, then tag each task by how much energy it needs—high, medium, or low. Sometimes I color code or use symbols to keep it obvious. This way, I schedule big tasks when I’m at my best and save lighter stuff for my tired parts of the day.

For example, I’ll put challenging meetings, technical handovers, or big calls in my prime windows. Admin work, inbox clearing, or repetitive process tasks go to low-energy times. Grouping similar tasks together helps me avoid flipping between different kinds of work and lowers my mental load.

visual roadmap: my checklist for a two-week exit

Here’s how I mapped my last tech exit using a simple Gantt chart and milestone checklist (a trick I picked up running my ready-to-wear company, where visual planning was everything):

Two-Week Exit Plan (Gantt-style, mapped to energy peaks):

  • Week 1

    • Morning (high energy): Write documentation, plan handover meetings
    • Midday (medium): Knowledge transfer sessions, Q&A with team
    • Afternoon (low): Organize files, update tickets, clear inbox
    • End of week: Milestone check—Is documentation 80% done? If not, adjust next week’s plan
  • Week 2

    • Morning (high): Finalize handover, record walkthrough videos
    • Midday (medium): Handover meetings, feedback sessions
    • Afternoon (low): Archive files, expense reports, goodbye messages
    • End of week: Milestone check—All handover complete? If not, trigger contingency plan (see below)

This visual approach made it easy for me to spot bottlenecks and adjust for unexpected dips. According to a recent insight I came across, visual planning tools like Gantt charts can reduce task-switching fatigue by up to 30%—I definitely felt that difference.

contingency triggers: planning for the unexpected

I always include contingency triggers in my roadmap. For example, if my client acquisition targets aren’t met by day 7, I’ll pause non-essential tasks and focus on outreach. If documentation isn’t 80% done by the end of week one, I’ll block extra high-energy time for it and push less urgent admin to the side. This habit came from my days in cross-border e-commerce, where supply chain hiccups taught me to always have a fallback.

building buffers and protecting mental health

buffers for slumps and surprises

Plans rarely work out perfectly, so I build in buffers for myself. After big milestones—like final handovers or major meetings—I block time for easier work or just for a break. Sometimes that means a slow afternoon after a stressful meeting, or a week with fewer calls after a tough project wrap-up. These pauses protect me from feeling run down and give space to recover.

I’ve learned to expect emotional dips after intense weeks or big events. I add recovery into my plan—whether that’s a walk in the park, an hour in the garden, or a bit of carpentry in my workshop. These routines help me bounce back. I treat rest times as must-haves, not just extras. When a surprise project or a crash in energy hits, I shuffle my schedule. My minimalist plan can flex: I move less urgent things, switch meetings if needed, or delay handover sessions to look after my health.

Mental health is a real concern for me. During my last transition, I found that even a few minutes tending to my balcony plants or sanding a piece of wood helped me reset. These small rituals became my anchors, especially when anxiety spiked after a tough goodbye or a project didn’t land as planned.

minimalist tools for energy and exit planning

digital tools for simple energy tracking

If I’m in a digital mood, I use Notion templates or Google Sheets to log my energy and manage exit tasks. Color coding or tags pull out my prime times and keep my plan clear. Setting up a sheet or template only takes a few minutes, and it makes my schedule more visual and easier to adjust.

Apps like Daylio, Rise, and Energy Tracker let me log energy in real time. They blend well with my other daily habits, and their charts help me see regular patterns so I can tweak my plan when my energy changes. If I don’t want to be glued to my phone, paper options work just as well.

Habit trackers such as Habitica or Streaks help me tie energy check-ins to other habits, with reminders to keep me consistent. These apps support lasting change by mixing energy tracking with habit building. Still, sometimes old-school pen and paper or stickers just feel nicer.

analog options for digital minimalists

Paper planners and bullet journals still appeal to me when I want less screen time. Drawing a basic table or using colored stickers for energy levels makes things easy to see at a glance. This physical approach is quick to set up and I can restyle it any way I want. Printable grids or overlays make it easy to grab a fresh page without much effort.

I keep these printouts on my desk for easy checks during the day. When I spend hours in front of the computer, a paper tool helps lower digital overload and brings a bit of calm. Analog planning also feels more personal and can be a mental break in itself.

Setting up with paper helps me worry less about missed notifications and feel less crowded by screens. This supports my mental health and makes the process friendlier.

energy mapping in practice

energy mapping in practice

Let me share a story from my own journey. When I left a SaaS company in Berlin, I wanted my handover to go differently. I spent two weeks noting my energy throughout each day and quickly noticed my sharpest hours came between 10am and 1pm, while my focus always dropped after lunch. Using this, I built a plan to suit my natural flow instead of just following the company’s exit checklist.

I scheduled handover meetings, big documentation sessions, and important Q&As during my morning peaks. Routine jobs—updating tickets and archiving files—were moved to slower afternoons. This made it easier to concentrate on the work that really mattered, lowered mistakes, and made the switch easier for both me and my team.

But it wasn’t just about admin. I filled low-energy blocks with walks and short chats with colleagues, offering a gentle way to recover. These small pauses helped me manage the emotions of leaving, too. I still remember the wave of anxiety after my final handover session—my hands were shaking, and I wondered if I’d left something undone. But after a walk along the canal and a quiet coffee, relief set in. I realized I’d done enough, and that feeling of peace carried me into my next chapter.

The result? Fewer mistakes, better knowledge transfer, and a new team member who got up to speed fast. I left feeling less drained and more at peace with the change. I’ve used this approach in Lisbon as well, where working with my daily energy patterns made both team handovers and solo projects lighter and more sustainable.

sustaining momentum with energy-aware indie routines

keeping routines sustainable after the exit

Energy planning doesn’t end when I leave a job. Working alone means I set my own structure, but no one else is there to stop me from overdoing it or drifting into bad habits. Simple routines—like weekly check-ins or minimalist planning—make it easier to stay in control and find satisfaction.

I build in weekly energy checks, keep plans simple, and respect rest periods. These habits help me avoid falling into old burnout cycles. Over time, this becomes automatic. One helpful strategy is giving myself a few minutes each week to review my energy, change my workload if needed, and block time for real breaks. Sometimes I jot a quick note in a planner or add a reminder to my calendar.

But let’s be honest: the financial realities of freelance life can be stressful. When I first started working independently in Lisbon, the excitement of freedom was quickly tempered by the anxiety of unpredictable income. I had to set clear work-life boundaries—no emails after 7pm, and at least one full day off each week—to protect my mental health and avoid the trap of endless hustle. I also built a simple spreadsheet to track cash flow and set aside a buffer for lean months, which helped me sleep better at night.

With regular practice, energy mapping becomes just another part of my workweek. It helps me batch deep work, hold onto creative space, and keep my well-being front and center. The end result? My work matches my values and life—not just a task list. It’s a base for long-term freedom and satisfaction.

Facing a tech exit or big career change is rarely easy, but personal energy mapping has made managing the work and emotions more realistic for me. When I track my energy and match my most important tasks to my strongest moments, transitions get less tiring and more purposeful. This approach supports both getting things done and taking care of my mind, so I can lessen burnout and make space for what matters. Whether I use digital apps or simple paper trackers, the real trick is to keep routines simple and open to change, so I can respond well to surprises. Making rest and recovery a steady part of my plan protects my drive for what’s next.

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My Own Adventures
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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.

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(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.
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Second Bureau
(Beijing/Paris)

CTO / Managing Director Asia
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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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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.

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