Senior Platform Engineer

A2Dominion Group; Greater London; Hybrid; GBP 75,000 - 110,000; Full time

Benefits offered by this job

25 days’ holiday (Plus Bank Holidays)

Up to 8% contributory pension

Annual health and lifestyle benefits £

Job summary

A2Dominion is seeking a Senior Platform Engineer in London (Ealing) to lead and evolve our enterprise technology platforms, balancing on-site attendance with hybrid work. You’ll own cross-domain platforms and ensure security, resilience and operational readiness.

You will collaborate with Architecture, Cyber Security, and vendors to deliver scalable cloud and identity services, including Azure and Microsoft 365, with IaC-driven automation and strong governance.

Qualifications

• Significant experience in senior infrastructure or cloud leadership roles.
• Experience owning and modernising enterprise platforms.
• Strong supplier-management and vendor-escalation experience.
• Proven ability to translate architecture into service readiness.

Responsibilities

• Act as the senior technical authority for assigned technology platforms, ensuring security and resilience
• Provide technical leadership across enterprise infrastructure, cloud, collaboration, identity and hybrid services
• Own the full lifecycle of technology platforms from implementation to retirement
• Lead design and improvement of complex solutions that are scalable and secure
• Translate architectural designs into reliable operational services
• Lead service acceptance and operational readiness for new services
• Provide governance for Azure, Microsoft 365, identity and SaaS integrations
• Drive automation and Infrastructure as Code practices
• Maintain secure platforms through patching and vulnerability remediation
• Lead resilience and disaster recovery tests
• Build relationships with suppliers and service providers
• Deputise for Infrastructure Manager when required

Skills

Senior infrastructure leadership

Cloud platform engineering

Technical leadership

Hybrid infrastructure expertise

Supplier management

Service management

Education

ITIL Foundation or equivalent service management qualification

Tools

Azure

Microsoft 365

VMware

Job description

Location: Ealing / Hybrid (some office attendance required)

Contract type: Permanent – Full Time (35 hours per week, Monday to Friday)

Lead and evolve the technology platforms that power our organisation

Are you a senior infrastructure or cloud professional with a passion for building secure, resilient and high‑performing technology platforms? Do you enjoy combining technical leadership with hands‑on engineering expertise, helping shape the future of enterprise technology while ensuring critical services remain reliable and secure? If so, this could be the opportunity for you.

We’re looking for a Senior Platform Engineer to join our Infrastructure team within Information Technology. In this senior technical role, you’ll provide leadership and ownership across a range of enterprise platforms, ensuring services remain secure, resilient, supportable and aligned to organisational objectives.

Working closely with Architecture, Cyber Security, Business Applications, End User Computing, suppliers and business stakeholders, you’ll play a key role in delivering technology services that provide long‑term business value. From cloud platforms and identity services to Microsoft 365 and SaaS technologies, you’ll be responsible for the engineering, governance, continual improvement and operational readiness of critical technology platforms across the organisation.

Key Responsibilities

• Act as the senior technical authority for assigned technology platforms, ensuring services remain secure, resilient and aligned with organisational standards
• Provide technical leadership across enterprise infrastructure, cloud, collaboration, identity and hybrid technology services
• Own the full lifecycle of technology platforms, from implementation and optimisation through to renewal and retirement
• Lead the design, implementation and continual improvement of complex technology solutions, ensuring they are scalable, secure and operationally supportable
• Translate architectural designs and strategic technology direction into reliable and supportable operational services
• Lead service acceptance and operational readiness activities for new and changed technology services before they move into live operation
• Provide technical ownership and governance for Azure, Microsoft 365, identity services, SaaS platforms and associated integrations
• Drive the adoption of automation, platform engineering and Infrastructure as Code practices to improve service quality and operational efficiency
• Maintain secure technology platforms through effective patching, configuration management, vulnerability remediation and technical assurance activities
• Lead resilience, disaster recovery and service continuity activities, ensuring recovery capabilities are tested and improved regularly
• Build strong relationships with suppliers, technology vendors and service providers to ensure high standards of service delivery
• Deputise for the Infrastructure Manager when required and contribute to engineering standards, operating models and technology roadmaps

More About You

• Significant experience in senior infrastructure, cloud, platform engineering or technical leadership roles
• ITIL Foundation or equivalent service management qualification
• Proven experience owning or leading enterprise infrastructure, cloud, platform or SaaS services throughout their lifecycle
• Experience delivering and supporting operationally critical technology services
• Extensive experience supporting and optimising hybrid infrastructure, cloud and SaaS environments
• Strong knowledge of Microsoft 365, Azure, VMware, enterprise infrastructure and integration technologies
• Experience leading complex technical implementations involving multiple stakeholders and suppliers
• Strong supplier‑management and vendor‑escalation experience
• Experience leading technical troubleshooting, root‑cause analysis and service restoration activities
• Proven ability to influence technical direction, engineering standards and best practice

Choosing us is easy

As an employee of A2Dominion, we want you to feel rewarded and have a choice of flexible benefits, salary exchange benefits, and rewards and discounts that work for you, wherever you are in your life.

We offer a wide range of staff benefits. For this role, these include:

• 25 days’ holiday (Plus Bank Holidays) increasing up to 28 days with 3 years of service
• Up to 8% contributory pension
• All permanent and fixed‑term employees receive a generous annual allowance of up to £300 to use towards health and lifestyle benefits for both you and your family

Inclusion at A2Dominion

We’re proud to be a Disability Confident Employer and welcome applications from people of all backgrounds. Our recruitment process is inclusive and accessible, and we guarantee an interview to disabled applicants who meet the minimum criteria. Reasonable adjustments are available throughout the process - just contact our Resourcing Team at [e-mail]

We know some people may hesitate to apply unless they meet every requirement. If that’s you, we’d still encourage you to apply - or get in touch with us to talk it through.

At A2Dominion, we value diversity, embrace flexibility, and are a family‑friendly employer. Everyone belongs here. Join us and help make a lasting difference in the lives of our customers.

This vacancy is being managed by Danny Banks. The role closes on 1st October 2026 and we reserve the right to close early upon appointment of the right candidate.