Salary: £? - ? per year Requirements:

Active SC clearance is required.
Proven experience as an architect on large-scale legacy data centre exit, application migration, or cloud transition programmes, including defining migration mechanisms, patterns, sequencing, and cutover approaches.
Strong architectural knowledge of legacy on-premise hosting and migration into cloud or other target hosting environments; this is a migration architecture role rather than a greenfield cloud service design role.
Experience with legacy technologies such as Java, Oracle, WebLogic, IIS, Windows/Linux, AIX, Solaris, COBOL, and GEN; deep expertise across every listed technology is not required.
Experience defining migration approaches and leading technical teams through discovery, design, and cutover.
Strong understanding of platform-level requirements, including networking, IAM and security, access patterns, storage, resilience, and monitoring.
Ability to manage complex technical dependencies and coordinate multiple engineering teams.
Excellent communication and stakeholder engagement skills, including working with senior client SMEs and multi-supplier delivery teams.
Experience working within architectural governance and programme-level technical controls.

Responsibilities:

Own the architectural direction for all applications and components within the assigned workstream, ensuring alignment with programme standards and target platform patterns.
Act as the workstreams point of technical decision-making and design governance.
Provide leadership to architects and ensure technical clarity and consistency across teams.
Ensure complete and accurate discovery of all services in the workstream.
Consolidate discovery findings into a workstream-wide view of architecture, dependencies, integrations, and constraints.
Validate assumptions, identify gaps, and ensure discovery findings inform migration design.
Work with the Lead Platform Architect to define each services migration approach, such as re-hosting, re-platforming, relocating, or uplifting.
Ensure migration designs reflect security requirements, target platform constraints, network patterns, IAM, storage, monitoring, and operational readiness.
Oversee the creation and quality assurance of migration design documentation for each application.
Identify, document, and manage cross-application dependencies within and across workstreams.
Work with delivery management to define sequencing, align migration windows, and ensure readiness across components.
Coordinate with cloud engineers, target hosting SMEs, security and network teams, and platform engineering groups to ensure migration readiness.
Engage with legacy SMEs, including those working with Oracle, WebLogic, IIS, AIX, Solaris, COBOL, and GEN, to understand constraints and required remediation.
Provide technical oversight during migration execution and cutover events.
Support troubleshooting and issue resolution across the workstream during execution.
Ensure services meet cutover readiness, rollback planning, and operational acceptance criteria.
Represent the workstream in architectural and technical governance forums.
Manage workstream-level technical risks, issues, decisions, and assumptions.
Provide clear, concise technical updates to programme leadership.

Technologies:

Architect
Cloud
COBOL
IAM
Support
Java
Linux
Network
Oracle
Security
Windows

More:

We are seeking experienced Solutions Architects to provide end-to-end technical leadership across workstreams in a large-scale legacy-to-cloud migration programme for a large, complex organisation. The programme will migrate a diverse estate from legacy data centres to cloud and other target hosting environments. This is a six-month contract, with scope to extend, paying £500–£800 per day inside IR35. The role is predominantly remote, with occasional travel and possible weekend work for planned deployment and cutover activity.

last updated 44 week of 2026

Lead Solutions Architect (Legacy to Cloud)

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