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Job ID Location Work Location
20011S Reading Reading Office (GBM)
Job Type Contract Type Hours Per Week
Professional Full-time 37.5
Shift Pattern Closing Date
Standard working week 09/08/2020

We've got big ambitions.


Ambitions that see us want to grow and become one of the nation's best-loved brands.


Sound interesting? That's just the start.


We're leading our industry in terms of change, and delivering amazing experiences for our customers. And our Technology and Operations team are leading the changes to our network.


We're a diverse bunch brimming with talent. Firing on all cylinders with a culture that not only delivers change but market leading solutions to our network and technology.


All this means we need more brilliant people. Ones who share our ambition, and get stuck in with the next and most exciting part of our story.

Are you in? 

Where possible we’re committed to flexible working and supporting our employees to have the right work life balance. Do however note, if you choose to apply for a different work location you will not have any eligibility for relocation support or travel allowances. 

The Technical Design Authority - Cloud Security role defines the technical design and delivery of security solutions.  You'll gather the business requirements and architect a solution, acting as technical lead and providing governance to various vendors and internal stakeholders who will ultimately implement and deliver the solution on time, on budget and to high quality standards as contracted.

The business area covers IT/Cyber security solutions and is particularly focused on cloud / containerisation security.  This is senior role requiring expertise in this area and a proven ability to lead technical solutions.

Domain specific responsibilities
  • Design security solutions using security products, such as IAM/PAM, proxy, firewall, IDPS,  SIEM, microservices stacks, microsegmentaion, etc.
  • Requirements (functional/non-functional/security) definition and governance – security requirements derived from NIST based standards and guidelines
  • Definition and maintenance of domain level architecture patterns for security
  • Conduct service level threat assessments for Cloud Core Network
Role responsibilities
  • Provide technical leadership as a systems integrator (SI) or towards the SI’s and the supplier in the ensuring solution design meets the domain architecture and business outcomes.
  • Requirements gathering for creating domain designs
  • Produce and oversee the production of high level designs, low level designs, test plans, deployment guidelines and TTO`s.
  • Work alongside cross-functional delivery teams including partners and vendors to support delivery throughout the delivery lifecycle and ensure solutions are delivered into production on time and meet the operational acceptance criteria
  • Ensure the delivery of the solutions conforms to contractual outcomes and timescales.
  • Support the Programme and Project Manager in project planning, risk and issue management and the budgeting process.

  • Cloud/containerisation security experience and good knowledge of Openstack/VMWare/AWS/Azure 
  • Experience working with complex IT infrastructures and technologies
  • Telco experience is not essential
  • Demonstrable experience of providing technical, decision making and problem-solving leadership for a technical domain and can demonstrate setting technical direction and quality/ standards for delivery and design.
  • Experience of requirements gathering of creating solution or service designs in an IT or network area.
  • Experience of designing and delivering fault and performance management solutions.
  • Strong analysis skills both business and technical. 
  • Experience of estimating effort and duration of delivering designs and test plans.
  • Demonstrable experience of providing technical, decision making and problem-solving leadership for a technical domain and can demonstrate setting technical direction and quality/ standards for delivery and design.
  • Demonstrate the ability to communicate with multiple stakeholders within the organization to act as the liaison between the business, other technical communities and the 3rd party delivery teams to ensure the delivery of the business requirements.  This should include the ability to convert business requirements into a technical solution and vice versa
  • Knowledge of ITIL or similar frameworks for delivery into Operational environments.
  • In depth understanding and demonstrable experience in infrastructure and service security in cloud environment.
  • In depth understanding of security standards and policies.

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Three are a proud signatory of the Tech Talent Charter (TTC), working across industries to drive greater inclusion and diversity in technology roles.

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