Freelance Senior Security Engineer (onsite)

Strasbourg, Grand Est, fr on site Until 9/27/2026 10+ years exp First posted July 29, 2026 Last posted July 29, 2026
Job description

Are you ready to shape the future technological landscape in Europe?
We are dedicated to responsible digitalisation, building innovative, inclusive solutions that drive meaningful impact. With over 8,900 professionals across Europe, we help EU institutions, public and private organisations thrive in a rapidly evolving digital world. Are you ready to shape the future through technology? Your journey starts here. Take a look at some of our impactful projects here: https://netcompany.com/cases/ 

So, what are the main responsibilities of an Senior Security Engineer in Netcompany?

The Senior Security Engineer is responsible for designing, implementing, and maintaining cybersecurity solutions to protect the organization’s systems, infrastructure, and data.

As a Senior Security Engineer, you will:

  • Design, implement, maintain, and continuously improve cybersecurity solutions protecting government systems and critical infrastructure using modern security technology stacks.
  • Integrate and securely configure security controls in line with organizational policies, EU regulations, and public sector standards.
  • Monitor, evaluate, and investigate security controls and events, including security event analysis and SIEM tooling (e.g., Splunk investigations).
  • Identify, analyze, and remediate vulnerabilities and incidents, including patching, system hardening, and certificate and cryptographic asset management.
  • Ensure the security and resilience of systems across on-premise, cloud, and hybrid environments, including high-availability infrastructures.
  • Implement and enforce cybersecurity policies, procedures, and controls aligned with governance, risk, and compliance (GRC) frameworks.
  • Develop scripts, tools, and automation to enhance security monitoring, detection, and response capabilities.
  • Produce technical documentation, risk assessments, and audit reports; communicate findings to stakeholders and management.
  • Collaborate with internal teams, external providers, and public sector bodies; provide cybersecurity expertise and user support.

What would make you a fit for the role:

  • University Degree in Cybersecurity, Computer Science or related field and minimum 10 years of professional experience in cybersecurity, information security, or secure systems engineering within complex environments.
  • Proven expertise in security standards, frameworks, and compliance requirements (e.g., ISO 27001, NIS/NIS2, GDPR, or similar public sector frameworks).
  • Strong knowledge of security technologies and identity protocols: SSL/TLS, X.509, SAML, OAuth, OpenID Connect, JWT, AWS KMS, KMIP, PKCS#11, including digital certificates and hardware security modules (HSMs).
  • Solid understanding of cryptographic principles and algorithms: AES, GCM, PBKDF2, HMAC, SHA-2.
  • Advanced knowledge of network security and architecture including next-generation firewalls and web application firewalls (e.g., Fortigate, Imperva), TCP/IP, IPSec, HTTP/HTTPS, routing, firewalls, routers, and switches.
  • Proficiency in Linux/Unix systems, system hardening, operating system security, and secure configuration practices.
  • Experience with secure software development lifecycle (SDLC), programming/scripting, and automation in security contexts.
  • Experience securing large-scale, complex environments (e.g., data centres, government systems, cloud and hybrid infrastructures).
  • Strong  communication skills in English, knowledge of French is an advantage.

If you are looking forward to be part of a diverse environment, and have the opportunity to work alongside well-experienced professionals, on challenging, large-scale projects that directly impact millions of citizens around the globe, then this is the place to be!

#LI-SS2

Please upload your CV in English via the Apply button. All applications will be treated as strictly confidential.

We ensure equal opportunities, treatment, and consideration to all candidates. Discrimination based on sex, racial or ethnic origin, religion or belief, disability, age, sexual orientation or marital status, physical or mental disability, or any other factor protected by applicable laws and regulations is prohibited. As part of the Netcompany culture, we respect human rights and focus on creating a positive workplace, where all employees are valued, and where diversity and inclusion are a vital part of our everyday working experience.

In the following link you may find our CV Submission privacy notice: https://netcompany.com/cv-submission-privacy-notice/

About this role

Summary

Design, implement, and maintain cybersecurity solutions for complex government and private systems.

Job title

Freelance Senior Security Engineer (onsite)

Experience level

senior level

Minimum experience

10+ years exp

Industry

it services

Location requirements

Onsite in Strasbourg, France, no remote work allowed

Salary

Not specified

Management role

No

Skills & keywords

Required skills

cybersecurityISO 27001NIS/NIS2GDPRSSL/TLSX.509SAMLOAuthOpenID ConnectJWTAWS KMSPKCS#11AESGCMPBKDF2HMACSHA-2network securityfirewallsLinux/UnixSDLCautomation

Preferred skills

French languagepublic sector frameworks

Specializations

cybersecuritysecurity solutionscloud securitycryptographymonitoring
Locations

Structured locations inferred from the posting.

Strasbourg, France

On-site City