Senior Security Engineer

Who we are

Billennium is a global technology company with over 20 years of experience delivering secure, scalable, and resilient digital environments for international organizations. Security‑by‑design, operational excellence, and continuous improvement are at the core of our approach.

We are looking for a Senior Security Engineer, who will lead security delivery across complex environments, ensuring proper implementation, documentation, and continuous validation of security controls, architectures, and configurations.

*Remote work with mandatory monthly attendance at our client’s office in Berlin. These visits may become less frequent in the future.

Responsibilities

• Developing detailed security deployment plans covering all stages of implementation.

• Identifying required resources, timelines, and dependencies for delivering security measures.

• Installing and configuring security solutions according to defined standards and best practices.

• Ensuring security controls are implemented consistently across the environment.

• Creating and maintaining precise documentation of configurations, architectures, and decisions.

• Updating documentation based on changes, improvements, or newly adopted standards.

• Using documentation to track execution, identify issues, and support compliance readiness.

• Ensuring full traceability of actions, decisions, and changes through detailed records.

• Validating security processes to ensure alignment with organizational goals and evolving threats.

• Identifying inefficiencies, discrepancies, or gaps and proposing corrective improvements.

Requirements

• Strong experience in designing secure network architectures (LAN/WAN, Zero Trust, segmentation / micro‑segmentation).

• Hands‑on expertise with modern network security technologies, including firewalls (Palo Alto, Checkpoint, Fortinet, Cisco), IDS/IPS, NAC, proxies, VPNs, load balancers, SD‑WAN, DDoS protection, SASE, SDN/ACI/NSX.

• Ability to lead security assessments, policies, and security‑driven projects, providing technical guidance and best practices.

• Strong understanding of DNS (architecture, operations, Infoblox, BIND, hybrid environments).

• Experience with automation and scripting (Ansible, Python) and collaboration with cross‑functional technology teams.

• Knowledge of security standards and compliance frameworks (ISO 27001, NIST, GDPR, SOC2).

• Security‑by‑design mindset, ability to evaluate new technologies, assess risks, and propose improvements.

• Experience in troubleshooting and optimizing secure network environments.

• Fluent English (C1), spoken and written.

Nice-to-have

• Experience with Jira, Confluence, Miro.

• Advanced Linux knowledge.

• Experience in SIEM operations or threat hunting.

Perks and benefits

• Private medical care, Multisport, language lessons, Udemy for Business, shopping vouchers, veterinary care.

• Flexible remote work and working hours.

• Training, certifications, security community participation, and development programs.

• Stable organization with mature processes and room for innovation.

• CSR initiatives, knowledge‑sharing sessions, and annual company events.

• Welcome pack.

Recruitment process

1. HR call

2. Interview with the client

3. Final decision / feedback