Uploaded April 2026 | Updated September 2026, 3 weeks ago
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This 15-minute demo shows how AI helps you spot and shrink the hidden energy and CO₂ footprint in “mature” Java code.
We use a simple, transparent theoretical model for sustainable decision making.
Micro-ops map to CPU work at one to five gigahertz, which we convert to milliwatt-hours bandwidth. Multiply that by your grid’s carbon intensity to estimate CO2. This matters because much of the marginal electricity on the grid still comes from gas turbines, so every milliwatt-hour you avoid cuts indirect emissions.
The AI annotates code line-by-line with uOps and mWh, flags smells/SOLID issues, predicts boost/threads risks, etc.
You’ll see how this works on small, widely used open-source Java libraries (think helpers, IO, logging, JSON).
We apply a lightweight playbook focused on under-utilization, waiting patterns, and bottlenecks. Using our ten DevOps++ open-source principles, like eliminate idle compute, right-size memory, prioritize I/O before scaling, prune work at the source, etc.
Key takeaways
A practical AI-assisted method to estimate a theoretical energy from code.
A repeatable playbook for low-risk patches that save watts without sacrificing speed.
A governance hook to make “less energy” a default quality bar in your CI/CD pipelines.
Target audience
Java engineers, tech leads, SRE/DevEx, FinOps/Sustainability owners, or anyone who wants measurable, low-effort energy wins in code and CI.
Please subscribe to our YouTube channel @ youtube.com/@DevoxxForever
Subscribe to LinkedIn @ linkedin.com/company/voxxed-days-amsterdam
Follow us on Twitter @ twitter.com/voxxedamsterdam
This 15-minute demo shows how AI helps you spot and shrink the hidden energy and CO₂ footprint in “mature” Java code.
We use a simple, transparent theoretical model for sustainable decision making.
Micro-ops map to CPU work at one to five gigahertz, which we convert to milliwatt-hours bandwidth. Multiply that by your grid’s carbon intensity to estimate CO2. This matters because much of the marginal electricity on the grid still comes from gas turbines, so every milliwatt-hour you avoid cuts indirect emissions.
The AI annotates code line-by-line with uOps and mWh, flags smells/SOLID issues, predicts boost/threads risks, etc.
You’ll see how this works on small, widely used open-source Java libraries (think helpers, IO, logging, JSON).
We apply a lightweight playbook focused on under-utilization, waiting patterns, and bottlenecks. Using our ten DevOps++ open-source principles, like eliminate idle compute, right-size memory, prioritize I/O before scaling, prune work at the source, etc.
Key takeaways
A practical AI-assisted method to estimate a theoretical energy from code.
A repeatable playbook for low-risk patches that save watts without sacrificing speed.
A governance hook to make “less energy” a default quality bar in your CI/CD pipelines.
Target audience
Java engineers, tech leads, SRE/DevEx, FinOps/Sustainability owners, or anyone who wants measurable, low-effort energy wins in code and CI.
![[VDBUH2026] Roberto Cortez - How difficult can it be to write efficient code?](https://i.ytimg.com/vi/qSJf8yKoFhY/mqdefault.jpg "[VDBUH2026] Roberto Cortez - How difficult can it be to write efficient code?
When we write code, we often prioritize completing our feature over performance. However, performance may become a bottleneck, requiring additional resources and time. When we reach that point, how should we proceed?
In this session, we will explore tools that can help us identify performance problems and focus our code improvements in the most beneficial areas. Some of these tools include AsyncProfiler, JMH, JFR, and others. Expect a session with lots of demos, live coding, real-life examples, and tips and tricks to help you get started on improving your code’s performance.")
![[VDBUH2026] Andra Ghibutiu & Alex Proca - Opening thoughts](https://i.ytimg.com/vi/qSzhiRLFcwY/mqdefault.jpg "[VDBUH2026] Andra Ghibutiu & Alex Proca - Opening thoughts
[VDBUH2026] Andra Ghibutiu & Alex Proca - Opening thoughts")
