Senior Security Engineer

The Directory Services Security Team (DSST) who are responsible for the management and control of privileged groups and accounts, various project workstreams and the overall security posture of the active directory and other LDAP environments, are looking for a Unix/Linux security specialist to join the team.

You will need to have a good understanding of the technologies used for the implementation of security initiatives and standards. You will have demonstrable experience in developing, maintaining, advising, and hardening operating systems and common applications.

You'll be implementing controls to lockdown and secure systems and devices. It is a highly focused, security centric role, looking at the standard methodologies for securing our privileged access accounts, security groups and servers within the estate. We proactively prevent and resolve vulnerabilities on servers in the Group. The whole team possesses broad skills including an emphasis on Security as well as problem solving through to resolution.

Day-to-day activities include

Lead multiple streams of work, project resource requests and out-of-hours/weekend support demands when required

Evaluate 3rd party security products and associated proof of concept environments

Provide recommendations on security designs

Write and maintain appropriate documentation related to the domain area including plans

Provide frequent status reports of all implementation tasks and maintain risks and issues for management as and if they arise

Ensure changes are accurately impact assessed, are represented at relevant boards for approval and implemented successfully and provide full aftercare assistance

Provide technical Support and direction for all security implementations and new standards and procedures to Service desk and staff

Assist with all Security related project work as well as BAU tasks as directed by Team leader

Crucial Skills

College degree in a relevant field or equivalent work experience

10+ years of Unix/Linux IT experience including system and network administration

Expertise in Unix server hardening, including secure configuration of root and service accounts, and enforcement of access controls via user groups and system-level policies. Validated ability with common enterprise security platforms e.g. SIEM, CrowdStrike, Qualys, Beyond Trust

Experience implementing and managing Security-Enhanced Linux for mandatory access control and system policy enforcement.

Skilled in configuring and maintaining audited for system auditing, event tracking, and compliance reporting.

3+ years of experience with public cloud platforms such as AWS

Good communication skills both written and verbal

Ability to adapt to the constantly evolving technology landscape

Effectively understand and implement complex systems

Vulnerability scanning and management

Private Key Infrastructure

Multi-factor authentication

Highly Desirable Skills

Experience of Kerberos would be an advantage

Ability to develop, test, implement and document solutions to a very high standard.

Excellent investigation and resolution of sophisticated issues and ability to locate application owners and collaborate closely with them.

Motivated self-starter who can work independently as well as part of a team.

High level of accuracy and attention to detail.

Able to take direction from others when needed and not afraid to ask for help.

Ability to learn new concepts and products with ease.

Ability to think quickly and critically and look for alternative solutions in challenging situations.

Ability to produce clear and accurate documentation and train/hand-off design and implementation work.

Ability to report in a formal and structured method.

Diversity & Inclusion

People are at the heart of what we do and drive the success of our business. Our colleagues thrive personally and professionally through our shared values of Integrity, Partnership, Innovation and Excellence are at the core of our culture. We embrace diversity and actively seek to attract people with unique backgrounds and perspectives. We are always looking at ways to become more agile, so we meet the needs of our teams and customers. We believe that an inclusive collaborative workplace is pivotal to our success and supports the potential and growth of all colleagues at LSEG

Proud to share LSEG in the India is Great Place to Work certified (Jun ’25 – Jun ’26).

Learn more about life and purpose of our company directly from India colleagues’ video: Bengaluru, India | Where We Work | LSEG

Career Stage:

Senior Associate

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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