Senior Software Engineer, Identity Software

Senior Software Engineer, Identity

Design and implement scalable identity infrastructure for secure authentication and authorization.

Job Tags: Software

About The Role

• Senior Software Engineer, Identity
• London, UK

At the foundation of these products is the Identity Engineering team.

In this role, you will help support the design and development of core software systems specifically focused on identity, access management, authorization, and authentication.

You'll also get widespread exposure to the forefront of the AI race as Scale sees it in enterprises, startups, governments, and large tech companies.

You will

• Drive the design, and implementation of our identity infrastructure to ensure secure authentication and authorization across enterprise systems.
• Build software for authentication mechanisms such as Single Sign-On (SSO), Multi-Factor Authentication (MFA), and federated identity solutions (SAML, OAuth, Open ID Connect).
• Build software for authorization mechanisms such as Relation-based access control (Re BAC), Attribute-based access control (ABAC), Role-based access control (RBAC).
• Build software‑defined identity governance policies to ensure compliance with security policies, industry regulations (e. g., NIST, SOC2, ISO 27001), and organizational standards.
• Present technical information to teams and stakeholders, providing guidance and insight on identity management and best practices.

Ideally you'd have

• 5+ years of full‑time engineering experience, post‑graduation with specialities in infrastructure and identity systems.
• Infrastructure expertise – IAM controls, Infrastructure as Code (Terraform, Pulumi), microservice deployment best practices.
• Hands‑on experience working with Open FGA, Authzed, Cedar, Topaz, or similar authorization frameworks at scale.
• Strong understanding of Zanzibar‑based Re BAC models, relationship tuples, and access control evaluation.
• Strong knowledge of authentication standards such as OAuth 2.0, OIDC, SAML, and JWT, as well as industry standard Id P solutions like Entra ID, Okta, etc.
• Extensive experience in software development and a deep understanding of distributed systems and public cloud platforms (AWS preferred).
• Show a track record of independent ownership of successful engineering projects.
• Possess excellent communication and collaboration skills, and the ability to translate complex technical concepts to non-technical stakeholders.

Nice to haves

• Experience securing API access and implementing access control mechanisms at the application level.
• Multi‑cloud infrastructure experience – AWS, Azure, GCP, and more.
• Proficiency in integrating IAM solutions with applications built using frameworks such as Java, Python, Node. js, or . NET.
• Mentorship/leadership experience supporting junior engineers

PLEASE NOTE: Our policy requires a 90-day waiting period before reconsidering candidates for the same role.

This allows us to ensure a fair and thorough evaluation of all applicants.

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We are committed to working with and providing reasonable accommodations to applicants with physical and mental disabilities.

If you need assistance and/or a reasonable accommodation in the application or recruiting process due to a disability, please contact us at accommodations@scale. com.

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