MSS Implementation Manager

More than you expected

The UK member firms of Grant Thornton are part of global network of independent audit, tax and advisory firms, made up of some 76,000 in over 150 countries. We're a team of independent thinkers who put quality, inclusion and integrity first. All around the world we bring a different experience to our clients. A better experience. One that delivers the expertise they need in a way that goes beyond. Personal, proactive, and agile. That's Grant Thornton.

Job Description:

NEW GROUND WON’T BREAK ITSELF.

Every day our teams help people in businesses and communities to do what is right and achieve their goals.

The Grant Thornton Cyber Defence Centre are an established MSSP at the forefront of Cyber solutions, working with industry leading technologies. We offer a path for progression and invest in our workforce. Initiative is encouraged and support is always available across the team and wider group. We work collaboratively and cross functionally, boasting a healthy ethos whereby we aim to promote the best version of ourselves and you.

We’re looking for a proactive and client-focused MSS Implementation Manager to join our growing Managed Security Services team. This is a newly created role, ideal for someone who thrives in a dynamic environment and is ready to take ownership of our client onboarding journey and technical workshop management.

You’ll act as the bridge between the sales handoff and engineering delivery owning the onboarding process, running discovery workshops, and ensuring smooth, timely implementation of our managed security services, that covers an array of capability (EDR, SIEM, Email, Risk, Resilience).

While you won’t be directly hands-on technical, a solid understanding of cyber security and IT infrastructure is essential to confidently engage with clients (SMB/Corporate) and internal teams.

We’re happy to talk flexible working and consider reduced hours and job shares, we’ll support you to balance your work and life.

A look into the role

As a MSS Implementation Manager within our Cyber Defence Centre, you will:

• Own the onboarding process for new Managed Security Services (MSS) clients, ensuring a seamless transition from pre-sales to delivery.
• Plan and lead technical discovery workshops with clients to define scope, gather requirements, and translate business needs into actionable outputs.
• Collaborate closely with Client Success Managers, Technical Account Managers, and Engineering teams to align on implementation plans and timelines.
• Drive outcomes from client workshops, producing structured deliverables that feed directly into SIEM and broader MSS configurations.
• Champion the onboarding experience, continually looking for ways to improve processes and documentation as the function evolves.
• Maintain visibility of onboarding progress across clients, communicating clearly with internal stakeholders and escalating risks or delays proactively.
• The Ability to engage with small to medium businesses and strip ambiguity to provide a degree of structure, focused on outcomes.
• Support informal project management activities; tracking deliverables, maintaining timelines, and helping clients stay engaged and informed.

Knowing you’re right for us.

Joining us as an MSS Implementation Manager, the minimum criteria you’ll need is experience of working cyber security implementations and project management. It would be great if you had some of the following skills, but don’t worry if you don’t tick every box, we’ll help you develop along the way.

• Experience in a client-facing role within cyber security, managed services, IT consultancy, or a related field, ideally within an MSP or MSSP environment.
• An understanding of IT infrastructure and core cyber security concepts, especially SIEM, logging, and detection principles.
• Comfortable leading workshops, running discovery sessions, and managing stakeholder expectations.
• Strong communicator with a confident and consultative style.
• A natural organiser who can coordinate multiple moving parts without needing formal project management certification.
• Self-starter who’s motivated by building processes, improving service delivery, and driving client satisfaction.
• UK-based with full right to work in the UK.

Whist the role maintains a core goal of client delivery excellence through presentation and communication, there is an expectation to support other team activities where possible; such as client reporting and technical account management; providing personal variety and growth within the team.

Nice to Have (but not essential)

• Experience working in an MSP / MSSP or similar security services environment.
• Familiarity with SIEM platforms (conceptually, not hands-on).
• Exposure to agile or structured delivery frameworks.
• and at times of high demand.

Knowing we’re right for you.

Embracing uniqueness, the culture at Grant Thornton thrives on the contributions of all our people, we never settle for what is easy, we look beyond to deliver the right thing, for everyone.  Building an inclusive culture, where we value difference and respect our colleagues helps our people to perform at the best of their ability and realise their potential.

Our open and accessible culture means you’ll interact with leaders who are interested in you and everything you bring to our firm. The things that set you apart, we value them. That’s why we give you the freedom to bring your whole self to work and pursue your passions inside and outside of work.

Beyond the job 

Life is more than work. The things you do, and the people you’re with outside of work matter, that’s why we’re happy to look at flexible working options for all our roles, and we’ll always do our best to keep your work and life in balance.

The impact you can make here will go far beyond your day job. From secondments, to fundraising for local charities, or investing in entrepreneurs in the developing world, you’ll be giving back to society. It’s that drive to do the right thing that runs through our every move, grounded in our firm’s values – purposefully driven, actively curious and candid but kind.

We’re looking for people who want to contribute, spark fresh ideas and go beyond expectations. People who want to be able to proudly do what’s right, for the firm, our clients, our people and themselves. It’s how it should be.

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