Freelancer profile translated to English.

Description

1️⃣ Having been confronted with the challenges posed by cybersecurity from the beginning of my professional career in the digital world, I have developed multidisciplinary experience over several years as both a pentester and a cybersecurity consultant for companies, ranging from national leaders in their business sector to VSEs/SMEs.

2️⃣ Now independent for over three years, I guide my clients in securing their systems, from detecting vulnerabilities to resolving them and strengthening their cybersecurity.

3️⃣ Beyond the technical aspects of pentesting, I strive to provide management and technical teams with a 360° view of their company's cybersecurity stakes.

4️⃣ I also intervene as needed on intelligence (OSINT) issues. I aim to provide my clients with the strategic information they need. This information comes from open sources such as the web, media, legal documents, etc.

💡 My pentests are based on PTES and OWASP methodologies, and they include the possibility of testing your resistance to social engineering.

As a former full-stack developer, I still develop sometimes in my spare time (old habits die hard!)

Find me on LinkedIn or aaccru.com for more information about my expertise as a pentester!

Industry field of expertise

Languages

English
Fluent
French
Native or bilingual
Spanish
Basic

Workplace preferences

Can work on-site

Paris (up to 50km), Bordeaux (up to 50km), Marseille (up to 50km), Rennes (up to 50km), Toulouse (up to 50km)

Auto-entreprise
Pentester / Ethical Hacker
CONSULTING AND AUDITS
September 2022 - Today (3 years and 11 months)
Paris, France
- Audit of web applications and exposed services.
- Assessment of security awareness within the company.
- Testing of authentication and authorization mechanisms.
- Verification of resistance to denial-of-service attacks.
- Analysis of security policies and internal procedures.
- Verification of compliance with security standards.
- Simulation of targeted attacks and realistic scenarios.
- Assessment of database security.
- Search for security vulnerabilities in applications and protocols.
- Analysis of security incident management.
- Verification of resistance to phishing attacks.
- Social engineering testing.
- Identification and assessment of information system vulnerabilities.
- Analysis of network configuration and firewalls.
- Recommendations for strengthening security and remediating identified vulnerabilities.
PenTest Cybersecurity Forensics IT Architecture
Ionos
Ethical Hacker | Bug Bounty
TELECOMMUNICATIONS
January 2021 - February 2024 (3 years and 1 month)
Paris, France
- Discovered 9 cybersecurity vulnerabilities at Ionos (3 in 2021 and 6 in 2024)

- Participated in the remediation of one of the vulnerabilities in 2021 (re-test post-remediation)
PenTest Cybersecurity OWASP Audit JavaScript
UXIA
Cybersecurity Referent / Back-End Developer
DIGITAL AND IT
May 2021 - November 2022 (1 year and 6 months)
Paris, France
- Back-end developer, APIs in PHP/SYMFONY for SaaS applications, mainly on the resource management software (ERP) of a company in the pharmaceutical sector
- Pentests
- Cybersecurity incident analysis
- Secure architecture design
- Creation of the cybersecurity department
- Scripting of devsecops tools
PenTest Cybersecurity IT Architecture PHP MySQL

Check out Nicolas's experience

David

Création d'un système de gestion de marketplace de theme - Tip4Serv

Reviewed on 6/5/2026

Nicolas was excellent! He developed clean, clear, and well-structured PHP code. The project turned out to be more substantial than expected, but he adapted quickly, met the challenges, and delivered on time. I am very satisfied with the final result and would not hesitate to work with him again on future projects.

Quantin

Réactif et Performant - 11.65Lab

Reviewed on 3/26/2026

We worked with Nicolas to secure a video advertising company. Within a company with high demands, we set up a video studio. Nicolas found the solutions to secure the network part of it.

Show all 21 reviews