Senior Security Specialist

Role Summary

The Cybersecurity Architecture Reviewer is responsible for conducting security architecture assessments for applications, platforms, cloud services, infrastructure, and technology solutions to ensure alignment with enterprise security policies, architectural standards, and industry best practices. The role includes reviewing firewall connectivity requests, network security designs, and application integrations to identify risks and recommend secure solutions while enabling business delivery.

Key Responsibilities

·       Conduct cybersecurity architecture reviews for new and existing applications, platforms, cloud services, and technology solutions.

·       Review cloud, on-premises, hybrid, and third-party integrations to ensure secure architectural design and connectivity patterns.

·       Assess solution designs, architecture diagrams, data flows, technical documentation, and technical requirements from a security perspective.

·       Review firewall and network access requests to validate compliance with approved architectures, security standards, and business requirements.

·       Evaluate security controls, including authentication, authorization, encryption, logging, monitoring, and data protection mechanisms.

·       Partner with Solution Architects, Engineering Teams, and Project Teams to embed security requirements into solution designs and development initiatives.

·       Perform firewall policy reviews across traditional, next-generation, and virtualized firewall platforms.

·       Design, implement, and support firewall governance processes, including rule recertification, change management, audit traceability, and exception management.

·       Design and assess secure connectivity patterns aligned with enterprise security principles, architectural standards, and regulatory requirements.

·       Provide security recommendations, architectural guidance, and risk mitigation strategies based on industry best practices and organizational standards.

·       Support governance activities, including periodic access reviews, firewall rule recertification, security exception reviews, and compliance assessments.

·       Operate and maintain metrics, dashboards, and reporting to measure the effectiveness and efficiency of the Security Architecture function.

·       Document security findings, risks, recommendations, and review outcomes, ensuring effective stakeholder communication and remediation tracking.

• Evangelise Security Architecture as an enabler as opposed to a blocking point

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Required Skills & Experience

• Strong understanding of cybersecurity architecture principles and secure solution design practices.
• Experience reviewing cloud environments (AWS, Azure, GCP), on-premises infrastructures, and hybrid architectures.
• Knowledge of network security technologies, including firewalls, proxies, VPNs, network segmentation, and secure remote access solutions.
• Experience with firewall platforms such as Palo Alto, Check Point, Fortinet, Cisco FMC/FTD, VMware NSX, or equivalent technologies.
• Strong understanding of authentication protocols, Identity and Access Management (IAM), encryption technologies, PKI, and key management.
• Experience conducting threat modelling, risk assessments, and security architecture reviews.
• Understanding of API security, SaaS security, vendor risk management, and third-party connectivity assessments.
• Familiarity with security frameworks and standards such as NIST CSF, ISO 27001, CIS Controls, OWASP, and Zero Trust Architecture.
• Strong analytical, stakeholder management, communication, and influencing skills.
• Ability to translate technical risks into business-focused recommendations.

Preferred Qualifications

• Industry certifications such as CISSP, CCSP, SABSA, TOGAF, CCSK, AWS Security Specialty, Azure Security Engineer, or equivalent.
• Experience working in highly regulated industries, including Financial Services, Capital Markets, Banking, Insurance, or Critical Infrastructure sectors.
• Hands-on experience with security architecture governance, firewall review processes /FW operations and compliance activities.
• Experience operating security review processes, risk management frameworks, and enterprise security governance programs.

Experience Level

Typically 7-14+ years of cybersecurity experience, with at least 5 years in Security Architecture, Security Review, or Network Security Governance roles

Career Stage:

London Stock Exchange Group (LSEG) Information:

Join us and be part of a team that values innovation, quality, and continuous improvement. If you're ready to take your career to the next level and make a significant impact, we'd love to hear from you.

LSEG is a leading global financial markets infrastructure and data provider. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth.

Our purpose is the foundation on which our culture is built. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and set the standard for everything we do, every day. They go to the heart of who we are and guide our decision making and everyday actions.

Working with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. However, we will value your individuality and enable you to bring your true self to work so you can help enrich our diverse workforce.

We are proud to be an equal opportunities employer. This means that we do not discriminate on the basis of anyone’s race, religion, colour, national origin, gender, sexual orientation, gender identity, gender expression, age, marital status, veteran status, pregnancy or disability, or any other basis protected under applicable law. Conforming with applicable law, we can reasonably accommodate applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs.

You will be part of a collaborative and creative culture where we encourage new ideas. We are committed to sustainability across our global business and we are proud to partner with our customers to help them meet their sustainability objectives. Our charity, the LSEG Foundation provides charitable grants to community groups that help people access economic opportunities and build a secure future with financial independence. Colleagues can get involved through fundraising and volunteering.

LSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.

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