Platform Security Lead

ION; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A leading technology firm in Greater London seeks a Platform Security Lead to implement security controls across various platforms and infrastructure. You will lead incident response efforts, conduct root cause analysis, and improve system visibility. Ideal candidates should have over 7 years of experience in Information Security roles and relevant qualifications. Communication skills and problem-solving abilities are essential. The role offers a dynamic environment for career growth in a diverse team.

Benefits

Supportive and inclusive work environment

Career advancement opportunities

Qualifications

• Over 7 years' experience in Information Security or Security Architecture roles.
• Must have experience with vulnerability management processes.
• Need a team player who can work independently.

Responsibilities

• Lead incident response efforts to address emerging threats.
• Collaborate with teams to investigate and remediate incidents.
• Enhance system visibility and logging coverage.

Skills

Information Security expertise

Incident response capabilities

Programming/scripting skills (Python, PowerShell)

Understanding of operating systems (Windows/Linux)

Attention to detail

Problem-solving techniques

Education

Degree/diploma in a technology-related field

Tools

Endpoint Security tools (e.g. AV/EPP/EDR)

SIEM

DLP

Firewalls

Job description

The Role:

ION Markets Information Security Team is looking to hire a Platform Security Lead that support the division’s security strategy through definition and implementation of security controls across our platforms, infrastructure, and operational workflows.

As the Platform Security Lead, you will be responsible for designing and implementing end-to-end security controls across ION Markets on-premises infrastructure and other internal platforms. The role spans security architecture, engineering, and operations with a strong focus on automation, detection and secure by design principles. Additionally, as part of the role you will be leading and participating in threat detection, incident response and vulnerability management remediation.

You will be serving as both a technical leader and operational responder, working closely with Product, infrastructure and Security Operations teams.

We are looking for a hard‑working, dedicated and motivated individual. Excellent communication skills are a must, and the role holder will be expected to cultivate working relationships with other teams and colleagues of varying technical ability. The role would suit a technically strong candidate looking to drive forward career progression within a dedicated security team. Ideally the candidate will have come from related security and architecture roles, focusing on security operations and product development.

Key Responsibilities

• Serve as a senior incident responder, addressing emerging threats across the environment.
• Collaborate with infrastructure, network, and cross‑functional teams to contain, investigate, and remediate security incidents.
• Conduct root cause analysis and participate in forensic investigations as needed.
• Enhance system visibility by expanding logging coverage and implementing additional monitoring capabilities.
• Maintain, update, and regularly test incident response runbooks, containment strategies, and escalation protocols.
• Lead the end‑to‑end vulnerability management process for ION Markets systems, from identification to remediation.
• Provide support for security architecture reviews of developed systems to ensure alignment with best practices.
• Stay up to date with the latest security threats, news, intelligence, tactics, techniques, and vulnerabilities; conduct research and analysis to assess potential impact and exposure.
• Perform proactive threat hunting activities, and manage the triage, investigation, and escalation of security alerts.
• Develop Standard operating procedures for operations & architecture activities.

Required Skills, Experience and Qualifications

• Degree/diploma/certifications in a technology‑related field and/or relevant working experience; highly desired certifications include:
• Pen Test+, Security+, OSCP, CCSP, CEH, GCIH, GMON.
• 7+ years' experience in Information Security or Security Architecture roles.
• Must have fundamental programming/scripting capabilities (e.g. python, PowerShell, bash, etc.).
• Must have in-depth understanding of operating systems (Windows/Linux).
• A team player with the ability to work independently and unsupervised.
• Ability to own delegated tasks and see them through to completion.
• Ability to manage time and prioritize work to maximize productivity.
• Excellent communication skills (both written and verbal).
• Exceptional attention to detail and quality.
• Excellent problem‑solving techniques and trouble analysis skills.
• Endpoint security concepts, controls, and best practices for Servers (e.g. Windows and Linux).
• General IT networking concepts, protocols, standards and network security concepts, controls, and best practices.
• Cryptography fundamentals and data security controls and best practices.
• Forensic investigation techniques.
• Prior experience deploying, configuring, managing, and/or operating security technologies is preferred, such as endpoint security (e.g. AV/EPP/EDR), SIEM, DLP, SWG, CASB, UEBA, IDS, IPS, firewalls, IAM/PIM/PAM, vulnerability management, MDM, etc.

About us

We’re a diverse group of visionary innovators who provide trading and workflow automation software, high‑value analytics, and strategic consulting to corporations, central banks, financial institutions, and governments. Founded in 1999, we’ve achieved tremendous growth by bringing together some of the best and most successful financial technology companies in the world.

• Over 2,000 of the world’s leading corporations, including 50% of the Fortune 500 and 30% of the world’s central banks, trust ION solutions to manage their cash, in‑house banking, commodity supply chain, trading and risk.
• Over 800 of the world’s leading banks and broker‑dealers use our electronic trading platforms to operate the world’s financial market infrastructure.

ION is a rapidly expanding and dynamic group with 13,000 employees and offices in more than 40 cities around the globe. Our ever‑expanding global footprint, cutting edge products, and over 40,000 customers worldwide provide an unparalleled career experience for those who share our vision.

ION is committed to maintaining a supportive and inclusive environment for people with diverse backgrounds and experiences. We respect the varied identities, abilities, cultures, and traditions of the individuals who comprise our organization and recognize the value that different backgrounds and points of view bring to our business.

ION adheres to an equal employment opportunity policy that prohibits discriminatory practices or harassment against applicants or employees based on any legally impermissible factor.