IT Security Auditor – Network & Architecture

HumanInTech; Brussel Hoofdstad; On-site; EUR 111,000 - 166,000; Full time

Job summary

HumanInTech seeks an experienced IT security auditor to support a Belgian public-sector organisation. You will conduct a thorough security audit of network and infrastructure architecture, delivering an infrastructure map, a security model of data flows, and a remediation plan.

Based in Brussels for a two‑month, full‑time assignment starting as soon as possible, with no remote work. You will translate complex technical risks into business impacts for the Data Protection Officer and produce clear

Qualifications

• Audit experience in IT security within public-sector environments.
• Deep knowledge of network security including VPNs, firewalls and segmentation.
• Ability to map data flows, assess access controls and GDPR considerations.
• Experience producing clear, structured technical documentation.
• Proven ability to translate technical risks into business impacts for executives.

Responsibilities

• Audit infrastructure and network architecture and map interconnections.
• Model data flow security, assess exposure, and review logging policies.
• Create a remediation action plan with a prioritised technical roadmap.

Skills

Expert-level audit experience

Network security & architecture

Vulnerability analysis

Data governance

Public-sector IT knowledge

Investigative mindset

Business impact translation

Documentation expertise

Experience in large organisations

BPMN / business process modelling

Enterprise architecture

Native-level French

Education

Bachelor's degree or higher

Job description

What you will do

You will support the Data Protection Officer of a Belgian public-sector organisation by conducting a thorough security audit of the network and infrastructure architecture. Working with complete autonomy, you will deliver three key outputs:

• Infrastructure and network analysis: produce a complete mapping of physical and logical interconnections (corporate network, VPN, shared public-sector networks, public access points) and identify segmentation weaknesses
• Functional security analysis: model the security of data flows and access management, objectively assess the exposure level of application data, and analyse logging and monitoring policies
• Remediation action plan: draft a prioritised technical roadmap enabling the organisation to implement a remediation plan

The organisation relies on shared network infrastructures within the public sector and has undergone significant digital transformation since 2018, including a digital workplace and external platforms. Your audit will map technical compliance and risks in this complex, multi-tenant environment.

What we are looking for

• Expert-level audit experience: proven track record as an IT security auditor, with demonstrable examples of previous audit work
• Network security and architecture expertise: solid experience with routing, switching, firewalling, remote access (VPN IPsec/SSL) and segmented network architectures
• Vulnerability analysis: ability to audit complex multi-tenant environments and trace unauthorised access paths
• Data governance: demonstrated sensitivity to data flow security and GDPR compliance requirements
• Public-sector IT knowledge: practical understanding of public-sector IT environments, including familiarity with shared Belgian public-sector platforms
• Investigative mindset: rigorous investigative approach with the ability to proactively gather information from multiple stakeholders
• Business impact translation: skill in translating network vulnerabilities into business risks and concrete impacts for the Data Protection Officer
• Documentation expertise: expert-level ability to produce clear, structured technical documentation
• Experience in large organisations: expert-level experience working within large, complex organisational structures
• Business process skills: confirmed experience with business process management, modelling (BPMN) and re-engineering
• Enterprise architecture: confirmed experience in enterprise architecture
• Native-level French: all work and deliverables will be in French

You will need to provide a one-page methodological note explaining your approach to delivering all diagrams and analyses within the timeframe.

The setting

This assignment runs for two months, starting as soon as possible and concluding at the end of December 2026. You will be based in Brussels with no remote work option. The role requires full-time availability and the ability to work independently to meet tight deadlines.

Location: Brussels

Work address: Belgium

Employer / contracting party: HumanInTech

Applications close (Brussels time): November 8, 2026 at 1:00 AM

Engagement: Freelance or employed by HumanInTech

Working hours: Full-time

Experience: 6-10 years or more

Education: Bachelor's or more

Published: October 2026