Johan Denoyer
DSI À Temps Partagé Pour PME Et Collectivités (Responsable Informatique Externalisé)
Greater Rouen Metropolitan Area France
Summary
👤
Senior🎓
Top SchoolJohan Denoyer is a seasoned IT leader and fractional CIO with over 12 years of hands-on experience in cloud operations, network architecture and cybersecurity, now helping PME and collectivités regain control of their IT without hiring a full-time DSI. Founder of MailAuthCheck, he combines deep expertise in DMARC/SPF/DKIM with pragmatic FinOps and cloud cost optimisation to restore email deliverability and recover lost business opportunities. Former Head of Cloud Operations and long-time network architect, he has led multi-provider cloud stacks (AWS/GCP/OVH), managed SysOps/NetOps/SecOps teams and operated national telecom backbones. Known for clear, jargon-free communication and a zero-meeting, results-first approach, he focuses on measurable outcomes: higher deliverability, reduced risk and lower IT spend. Active in the FinOps community and climate-focused initiatives, he pairs technical depth with operational and fiscal discipline. An unusual but telling metric: MailAuthCheck has analysed over 4.5 million domains and produced hundreds of tailored diagnostics, underscoring his data-driven, impact-oriented practice.
13 years of coding experience
3 years of employment as a software developer
Lycée de LillebonneHigh School Diploma, High School Diploma at Whippany Park High SchoolBachelor of Science (BS), Network Administration, Bachelor of Science (BS), Network Administration at CESIMaster of Science (MSc), Network and System Engineering, Master of Science (MSc), Network and System Engineering at UVSQ Université de Versailles Saint-Quentin-en-Yvelines
French, English
Stackoverflow
19reputation
5kreached
1answer
0questions
Github Skills (91)
low-code10
firewall10
integrations10
automation10
pfsense10
no-code10
ai10
cli10
typescript10
resource-monitor10
workflow-automation10
tui10
freebsd10
archlinux9
golang9
Programming languages (12)
Github contributions (5)
jdenoy/jdenoy
Aug 2022 - Jun 2026
Contributions:15 pushes, 1 branch in 3 years 10 months
jdenoy/dapnet_send
Dec 2018 - Oct 2019
Contributions:13 commits, 12 pushes, 1 branch in 10 months
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