Senior It Security Specialist

Marsh Mclennan; Xico; Hybrid; MXN 600,000 - 1,000,000; Full time

Job summary

Marsh is seeking a Senior IT Security Specialist to join our NSI Security Architecture team in a hybrid role based in Mexico City. The role focuses on governance, review, and approval of firewall security controls across a global enterprise, emphasizing control assurance, policy compliance, and careful analysis of security controls rather than day-to-day operations.

You will review change requests, assess rule sets, identify risks, and collaborate with network, cloud, and platform teams to

Qualifications

• 3–4 years of experience in IT security or related field.
• Experience reviewing or governing firewall rules in enterprise environments.
• Strong understanding of network security concepts, segmentation, and access control.
• Experience with formal change management or ITSM processes.
• Strong analytical skills with high attention to detail.
• Ability to interpret complex configurations and historical changes.
• Effective communication and client service orientation.

Responsibilities

• Review and approve firewall change requests submitted through formal change management processes.
• Assess firewall changes and existing rules for alignment with security requirements and standards.
• Identify non-compliant or high-risk changes and support resolution through risk processes.
• Perform periodic reviews of deployed firewall rules for ongoing compliance.
• Analyze complex rule sets and historical design decisions.
• Provide security oversight for enterprise firewall environments (Palo Alto, cloud firewalls, Kubernetes).
• Maintain documentation and evidence to support governance, audit and control activities.
• Partner with network, cloud and platform teams to provide security guidance.

Skills

IT security experience

Firewall governance

Change management

Network security concepts

Analytical skills

Communication skills

Tools

Palo Alto Networks

Kubernetes

Job description

Company: Marsh

Description:

Senior IT Security Specialist We are seeking a Senior Specialist - IT Security to join our team at Marsh. This role will be based in Mexico City. This is a hybrid role that has a requirement of working at least three days a week in the office. As a Senior Specialist - IT Security, you will join the Security Architecture team within Marsh's Network & Security Infrastructure (NSI) organization. This role focuses on the governance, review, and approval of firewall security controls across a global enterprise environment. The position emphasizes control assurance, policy compliance, and thoughtful analysis of security controls, rather than day-to-day firewall operations. We will count on you to:

• Review and approve firewall change requests submitted through formal change management processes.
• Assess firewall changes and existing rules for alignment with internal security requirements, architectural standards, and least privilege principles.
• Identify non compliant or higher risk changes and support resolution through established risk acceptance processes.
• Perform periodic and targeted reviews of deployed firewall rules to validate ongoing compliance.
• Analyze complex and layered rule sets, including understanding historical changes and prior design decisions.
• Provide security oversight for enterprise firewall environments, including Palo Alto Networks, cloud native firewalls, and Kubernetes based platforms.
• Maintain documentation and evidence to support governance, audit, and control assurance activities.
• Partner with network, cloud, and platform teams to provide clear, practical security guidance.
• Contribute to improvements in firewall governance processes through standardization and supporting tools.

What you need to have:

• 3-4 years of experience in IT security, network security, or a related discipline.
• Experience reviewing, assessing, or governing firewall rules in enterprise environments.
• Strong understanding of network security concepts, segmentation, and access control.
• Experience working within formal change management or ITSM processes.
• Strong analytical skills with a high level of attention to detail.
• Ability to investigate and interpret complex configurations and layered historical changes.
• Effective communication skills and a strong internal client service orientation.

What makes you stand out:

• Broad security awareness across network, cloud, and platform security domains.
• Experience supporting security assessments, control reviews, or audit related activities.
• An inquisitive mindset with the ability to ask thoughtful questions and challenge assumptions constructively.
• Familiarity with scripting, APIs, or AI assisted tools to support analysis or governance activities.
• Security certifications such as CISSP, PCNSE, or cloud security certifications (AWS, Azure, GCP).

Why join our team:

• We help you be your best through professional development opportunities, interesting work and supportive leaders.
• We foster a vibrant and inclusive culture where you can work with talented colleagues to create new solutions and have impact for colleagues, clients and communities.
• Our scale enables us to provide a range of career opportunities, as well as benefits and rewards to enhance your well-being.

Marsh (NYSE: MRSH) is a global leader in risk, reinsurance and capital, people and investments, and management consulting, advising clients in 130 countries. With annual revenue of over $27 billion and more than 95,000 colleagues, Marsh helps build the confidence to thrive through the power of perspective. For more information, visit corporate.marsh.com, or follow us on LinkedIn and X. Marsh is committed to creating a diverse, inclusive and flexible work environment. We aim to attract and retain the best people and embrace diversity of age, background, disability, ethnic origin, family duties, gender orientation or expression, marital status, nationality, parental status, personal or social status, political affiliation, race, religion and beliefs, sex/gender, sexual orientation or expression, skin color, or any other characteristic protected by applicable law. Marsh is committed to hybrid work, which includes the flexibility of working remotely and the collaboration, connections and professional development benefits of working together in the office. All Marsh colleagues are expected to be in their local office or working onsite with clients at least three days per week. Office-based teams will identify at least one anchor day per week on which their full team will be together in person.