Senior OT Security Engineer – L3

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Are you experienced in OT / ICS Security and looking for your next challenge?

We have a great opportunity for you - Senior OT Security Engineer – L3!

Careers at TCS: It means more

TCS is a purpose-led transformation company, built on belief. We do not just help businesses to transform through technology. We support them in making a meaningful difference to the people and communities they serve - our clients include some of the biggest brands in the UK and worldwide. For you, it means more to make an impact that matters, through challenging projects which demand ambitious innovation and thought leadership.

• Gain access to endless learning opportunities.
• Build and maintain a team of high-performing individuals.
• Build strong relationships with a diverse range of stakeholders.

The Role

As a Senior OT Security Engineer – L3, you will bring deep expertise in ICS/OT security, with a strong focus on managing and optimising the Armis Centrix platform, to support large‑scale manufacturing environments. In this role, you will work closely with plant teams, cross‑functional stakeholders, and vendors, to strengthen the overall OT security posture, improve asset visibility, and enhance threat and vulnerability management across the OT landscape.

Key Responsibilities:

• Optimise the administration and management of the Armis Centrix platform across plant environments.
• Review the current deployment architecture of Armis Collectors and recommend improvements to reduce hardware footprint, simplify deployment complexity, and improve asset coverage.
• Review existing Armis configurations and implement enhancements to enable standardisation and best practices.
• Analyse and fine‑tune false positives and alert configurations within Armis.
• Review asset inventory and vulnerability data and improve data accuracy and reporting quality.
• Assess existing threat detection use cases and recommend, design, and implement additional use cases.
• Develop and enhance reporting on assets, vulnerabilities, and threats for plant and security stakeholders.
• Collaborate with cross‑functional teams, vendors, and plant operations teams to align security controls with operational requirements.

Essential skills/knowledge/experience:

• Extensive industry experience, with strong experience in OT / ICS Security.
• Hands‑on experience working with the Armis Centrix platform in OT environments.
• Strong understanding of plant OT infrastructure including PLC, DCS, MES, and SCADA systems.
• Good knowledge of OT network infrastructure, topology, configuration, and data flow architecture.
• Experience in asset management, vulnerability management, and security incident management within OT environments.
• Strong knowledge of information security concepts including Authentication, IAM, Endpoint Security, Firewalls, PKI, DLP, DAM, and EDR.
• Working knowledge of SIEM technologies such as Google Chronicle, Splunk ES, or QRadar.
• Experience with log source integration, correlation rule development, and parser writing.
• Experience in SOC operations, automation, and incident management processes.
• Ability to lead, coordinate, and communicate effectively within cross‑functional team environments.
• Excellent communication and presentation skills with the ability to present analytical data to varied audiences, including senior management.
• Ability to work effectively under pressure and manage competing priorities.

Desirable skills/knowledge/experience:

• Experience working within manufacturing, healthcare, energy, or utilities domains.
• Hands‑on experience with OT infrastructure, networks, and OT‑specific applications.
• Experience supporting large global clients in complex industrial environments.
• Exposure to cloud operations, such as AWS.
• Experience working in Agile delivery environments.

Rewards & Benefits

TCS is consistently voted a Top Employer in the UK and globally. Our competitive salary packages feature pension, health care, life assurance, laptop, phone, access to extensive training resources and discounts within the larger Tata network.

We offer health & wellness initiatives and sports events; we are the proud sponsor of the London Marathon.

Diversity, Inclusion and Wellbeing

Tata Consultancy Services UK&I is committed to meeting the accessibility needs of all individuals in accordance with the UK Equality Act 2010 and the UK Human Rights Act 1998.

We welcome and embrace diversity in race, nationality, ethnicity, disability, neurodiversity, gender identity, age, physical ability, gender reassignment, sexual orientation. We are a disability inclusive employer and encourage disabled people to apply for this role.

As a Disability Confident Employer, we offer an interview to applicants with disabilities or long-term conditions who meet the minimum criteria for the role. Please email us at UKI.recruitment@tcs.com if you would like to opt in.

If you are an applicant who needs any adjustments to the application process or interview, please contact us at UKI.recruitment@tcs.com with the subject line: “Adjustment Request” or call TCS London Office 02031552100 / +44 204 520 2575 to request an adjustment. We welcome requests prior to you completing the application and at any stage of the recruitment process.

Next Steps:

Application Process (optional)

1. Online application: You can apply directly through LinkedIn/ by uploading your CV. In case you wish to submit your application via another format like audio/video, please, contact - UKI.recruitment@tcs.com
2. Skill-Based discussion: This will be a level 1 interview with the project team, it can be via video or in-person. Details will be confirmed by your recruiter.
3. Managerial discussion: This discussion will focus on behavioural aspects and person-organisation fit.
4. HR Discussion: This will be with one of the members of the HR team and will cover your career journey, aspirations for growth, compensation and any other questions you may have.

Beware of Fraudulent offers

This is to notify you that TCS does not ask for any sort of payment or security deposit from candidates at any stage of the recruitment process. The firm never sends out job offers from free internet email services like Gmail, Yahoo Mail, and so on. TCS has not authorised any third-party company to collect money on their behalf. As a vigilant job seeker, beware of fraudulent recruitment activity and protect your interests! You can write to UKI.recruitment@tcs.com to report any fraudulent activity.

Due to the high volume of applications, we will be unable to contact each applicant individually on the status of their application. If you have not received a direct response within 30 days, then it should be deemed unsuccessful on this occasion.

Join us and do more of what matters. Apply online now.