Pki Cybersecurity Architect H/F - Alstom

Req ID:529386

At Alstom, we understand transport networks and what moves people. From high-speed trains, metros, monorails, and trams, to turnkey systems, services, infrastructure, signalling and digital mobility, we offer our diverse customers the broadest portfolio in the industry. Every day, more than 80 000 colleagues lead the way to greener and smarter mobility worldwide, connecting cities as we reduce carbon and replace cars.

OT PKI Architect
Role Summary
The OT PKI Architect is responsible for designing, implementing, and governing Public Key Infrastructure (PKI) solutions that secure Operational Technology (OT) environments. The role focuses on certificate lifecycle management, identity and trust services, device authentication, secure communications, and compliance across industrial control systems, manufacturing facilities, and critical infrastructure.
The architect works closely with OT engineers, cybersecurity teams, enterprise PKI teams, Project Cyber managers, bid manager and vendors to ensure secure and resilient certificate-based security solutions.
Key Responsibilities
PKI Architecture & Design

Design and maintain enterprise and OT PKI architectures.
Define certificate hierarchy, trust models, Certificate Authority (CA) structures, and security controls.
Establish offline root CA and issuing CA strategies for OT environments.
Develop certificate policies (CP) and certificate practice statements (CPS).
Ensure high availability and disaster recovery for PKI services.

OT Security Integration

Integrate PKI solutions with:

Signalling systems
Turnkey systems
Distributed Control Systems (DCS)
Industrial Control Systems (ICS)

Secure machine-to-machine (M2M) communications.
Implement mutual TLS (mTLS) authentication for industrial applications.
Support Zero Trust initiatives within OT environments.

Certificate Lifecycle Management

Design automated certificate enrolment and renewal processes.
Implement certificate discovery and inventory management.
Manage certificate issuance, renewal, revocation, and replacement.
Reduce certificate-related outages through proactive monitoring.

Security Governance & Compliance

Define PKI standards, policies, and operational procedures.
Ensure compliance with:

IEC 62443
NIST Cybersecurity Framework
ISO 27001
Industry-specific regulations

Conduct security risk assessments and architecture reviews.

Technical Leadership

Lead PKI-related projects and transformation initiatives.
Provide technical guidance to OT and cybersecurity teams.
Evaluate PKI and certificate management technologies.
Engage vendors and third-party partners on solution design.

Incident & Operational Support

Support incident investigations involving certificates and cryptographic services.
Troubleshoot PKI-related issues in OT environments.
Support certificate recovery and business continuity plans.

Required Qualifications
Education

Bachelor's degree in:

Computer Science engineering
Cybersecurity
Information Technology
Electronics Engineering

Experience

7+ years in Cybersecurity, PKI
Experience designing enterprise-grade PKI solutions.
Experience with critical infrastructure or industrial environment

Technical Skills
PKI & Cryptography

Microsoft ADCS(Must have)
EJBCA (Must have)
DigiCert PKI Platform (Nice to have)
Entrust PKI (nice to have)
Keyfactor (nice to have)
Venafi (nice to have)
OpenSSL

Cryptographic Knowledge

X.509 certificates
TLS / SSL
Mutual TLS (mTLS)
RSA
Hashing algorithms
HSM technologies

OT Security Knowledge

IEC 62443
NIST SP 800-82
Industrial networking protocols

Infrastructure

Windows Server
Linux
Active Directory
Azure PKI services
Cloud security integrations

Preferred Certifications (nice to have)

CISSP
CCSP
GIAC GICSP
GIAC GRID
Security+
Microsoft Security Certifications
ISA/IEC 62443 Cybersecurity Expert
Global Industrial Cyber Security Professional (GICSP)

Key Competencies

Enterprise Architecture
Security Design
Risk Assessment
Stakeholder Management
Problem Solving
Technical Leadership
Communication Skills
Project Management

Works Closely With:

PKI Service Managers
OT Security Engineers
SOC Teams
BID Technical manager
You don't need to be a train enthusiast to thrive with us. We guarantee that when you step onto one of our trains with your friends or family, you'll be proud. If you're up for the challenge, we'd love to hear from you!

Additionally, in the face of environmental challenges, many employees are choosing to cycle for their commute. To support this approach, the Saint-Ouen site has suitable infrastructure (secure parking, maintenance and inflation stations, lockers, etc.).

Important to note
As a global business, we're an equal-opportunity employer that celebrates diversity across the 63 countries we operate in. We're committed to creating an inclusive workplace for everyone.





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