Identity & Application Integration Engineer

DGH Recruitment; Greater London; On-site; GBP 65,000 - 85,000; Full time

Job summary

DGH Recruitment is seeking an Identity & Application Integration Engineer in the United Kingdom to lead migration and remediation efforts for identity, DNS, certificate, and SSO changes as part of a merger programme.

You will own assigned applications, understand architecture and authentication methods, and coordinate across vendor and internal teams to minimize business impact during migration and remediation activities.

Qualifications

• Experience migrating or remediating enterprise applications in merger programmes.
• Ability to assess application architecture, authentication methods, permissions, integrations and dependencies.
• Experience delivering remediation for identity, Entra ID, SSO, DNS, certificates and domain changes.
• Experience supporting applications with SQL Server or similar databases, including connectivity and authentication.
• Experience with IIS, SSL/TLS certificates, load balancers, reverse proxies and related infra.
• Ability to collaborate across Application/Identity/AD/Entra ID/DNS/PKI/SQL/Networking teams.

Responsibilities

• Take ownership of assigned applications for migration or remediation.
• Assess architecture, authentication, permissions, integrations and dependencies.
• Identify impacts from domain, identity, DNS, certificate, or SSO changes.
• Define and coordinate migration and remediation activities.
• Assess and implement SSO remediation for domain, identity, tenant, or email changes.
• Support DNS remediation including validation of changes.

Skills

Active Directory / Entra ID

Authentication & access control

SSO technologies (SAML, OpenID Connect

OAuth integrations

DNS concepts & changes

SSL/TLS certificate management

AD users, groups, service accounts

Application migration & remediation

SQL Server / relational DB concepts

IIS / web hosting & load balancers

Dependency mapping & impact analysis

Cross-team coordination

Job description

Identity & Application Integration Engineer

Role Overview:

Identity & Application Integration Engineer will be responsible for the end-to-end migration and remediation of applications impacted by identity, directory, domain, DNS, certificate, or Single Sign-On (SSO) changes as part of the merger programme.

Identity & Application Integration Engineer will act as the technical owner for assigned applications, taking responsibility for understanding application architecture, authentication methods, permission models, DNS dependencies, certificate requirements, vendor relationships, and business impacts to support successful migration and remediation activities.

Required Technical Skills:

• Enterprise applications integrated with Active Directory or Microsoft Entra ID
• Application authentication, authorisation, and access control models
• Single Sign-On (SSO) technologies including SAML 2.0, OpenID Connect, and OAuth
• Experience configuring, troubleshooting, and remediating SAML, OpenID Connect, and OAuth integrations
• DNS concepts including application-related DNS records, name resolution, and dependencies
• Experience managing application-related DNS changes, including DNS record updates, validation, troubleshooting, and dependency analysis
• SSL/TLS certificate management and application certificate dependencies
• Active Directory users, groups, service accounts, and permissions
• Application re-permissioning following identity, domain, or directory changes
• Application architecture, dependency mapping, and impact analysis
• SQL Server and relational database concepts including databases, schemas, tables, views,

Key Responsibilities:

• Take ownership of applications assigned for migration or remediation
• Assess application architecture, authentication methods, permissions, integrations, and dependencies
• Identify impacts resulting from domain, identity, DNS, certificate, or SSO changes
• Define and coordinate application migration and remediation activities
• Assess and implement SSO remediation activities required to support domain, identity, tenant, or email address changes
• Support DNS remediation activities, including identifying, validating, and coordinating application-related DNS changes

Required Experience;

• Experience supporting application migrations, merger programmes, or large-scale transformation initiatives.
• Experience assessing application architecture, authentication methods, permissions, integrations, and technical dependencies.
• Experience delivering remediation activities related to identity, Active Directory, Entra ID, SSO, DNS, certificate, and domain changes.
• Experience supporting applications with SQL Server or other relational database back ends, including connectivity, authentication, service accounts, and dependency analysis.
• Experience supporting web-hosted applications, IIS, SSL/TLS certificates, load balancers, reverse proxies, and related infrastructure components.
• Experience working across Application, Identity, Active Directory, Entra ID, DNS, PKI/Certificate, SQL/Database, Networking, Infrastructure, and Vendor teams.
• Experience coordinating technical and business stakeholders to deliver application changes and migration activities.
• Experience supporting testing, cutover, production implementation, and post-migration support within large enterprise environments.

Identity & Application Integration Engineer