Senior Infrastructure Engineer — App Migration & Identity

La Fosse; United Kingdom; On-site; GBP 70,000 - 100,000; Full time

Job summary

La Fosse is seeking a Senior Infrastructure / Application Migration Engineer to drive the migration strategy for a merger programme. You will analyze how applications are configured and plan the best migration path, focusing on identity, permissions, authentication and infrastructure.

You will work hands-on to define migration approaches, validate dependencies, and coordinate across owners, infrastructure, security and vendors to ensure smooth cutover.

Qualifications

• Extensive experience with application migrations and large-scale infrastructure transformations.
• Strong understanding of identity, permissions, and authentication models.
• Hands-on with PowerShell and scripting.
• Ability to collaborate with owners, infrastructure, security and vendors.

Responsibilities

• Assess applications and determine the appropriate migration approach.
• Review Entra ID, Active Directory, SSO, permissions and authentication requirements.
• Understand application dependencies across SQL Server, IIS, SharePoint, DNS and certificates.
• Assess existing integrations and determine how these should be migrated or reconfigured.
• Define changes required to permissions, service accounts, groups and access models.
• Work with application owners, infrastructure, identity, security and vendors to agree migration plans.
• Provide technical input into current-state/target-state designs, testing and cutover.

Skills

SSO

SQL Server

IIS / web infra

SharePoint

DNS & certificates

PowerShell

Tools

Entra ID

Active Directory

Identity & Access Mgmt

Job description

La Fosse is seeking a Senior Infrastructure / Application Migration Engineer to drive the migration strategy for a merger programme. You will analyze how applications are configured and plan the best migration path, focusing on identity, permissions, authentication and infrastructure.

You will work hands-on to define migration approaches, validate dependencies, and coordinate across owners, infrastructure, security and vendors to ensure smooth cutover.