Senior Software Engineer, Identity

Visa Hunt; Greater London; On-site; GBP 100,000 - 180,000; Full time

Job summary

Scale AI is seeking a senior engineer to help design and build core identity systems, focusing on authentication, authorization, and governance for enterprise-scale deployments.

You will work on SSO, MFA, and federated identity solutions, while implementing policy-driven access controls and alignment with industry standards. The role offers exposure to cutting-edge AI platforms and collaboration with cross-functional teams.

Qualifications

• 5+ years of full-time engineering experience in infrastructure and identity systems.
• Infrastructure as Code (Terraform, Pulumi) expertise.
• Hands-on with OpenFGA, Authzed, Cedar, Topaz, or similar authorization frameworks.
• Strong knowledge of Zanzibar-based ReBAC models, relationship tuples, and access control evaluation.
• Strong knowledge of OAuth 2.0, OIDC, SAML, and JWT; experience with IdP solutions like EntraID/Okta.
• Distributed systems experience and cloud platforms (AWS preferred).
• Proven track record of owning engineering projects and communicating with non-technical stakeholders.

Responsibilities

• Drive design and implementation of identity infrastructure across enterprise systems.
• Build software for authentication mechanisms (SSO, MFA, federated identity).
• Build authorization mechanisms (ReBAC, ABAC, RBAC).
• Develop identity governance policies aligned with security standards and regulations.
• Present technical information to teams and stakeholders with guidance on identity management.

Skills

Identity infrastructure

Security policy & governance

Stakeholder communication

Tools

Terraform

Pulumi

OpenFGA

Authzed

Cedar

Topaz

EntraID/Okta

Job description

Software is eating the world, but AI is eating software. We live in unprecedented times – AI has the potential to exponentially augment human intelligence. Every person will have a personal tutor, coach, assistant, personal shopper, travel guide, and therapist throughout life. As the world adjusts to this new reality, leading platform companies are scrambling to build LLMs at billion scale, while large enterprises figure out how to add it to their products. To make them safe, aligned and actually useful, these models need human eval and reinforcement learning through human feedback (RLHF) during pre-training, fine-tuning, and production evaluations. This is the main innovation that’s enabled ChatGPT to get such a large headstart among competition.

At Scale, our products include the Generative AI Data Engine, SGP, Donovan, and others that power the most advanced LLMs and generative models in the world through world-class RLHF, human data generation, model evaluation, safety, and alignment. The data we are producing is some of the most important work for how humanity will interact with AI.

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, OpenID Connect).
• Build software for authorization mechanisms such as Relation-based access control (ReBAC), 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 OpenFGA, Authzed, Cedar, Topaz, or similar authorization frameworks at scale.
• Strong understanding of Zanzibar-based ReBAC 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 IdP solutions like EntraID, 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.

About Us:

At Scale, our mission is to develop reliable AI systems for the world's most important decisions. Our products provide the high-quality data and full-stack technologies that power the world's leading models, and help enterprises and governments build, deploy, and oversee AI applications that deliver real impact. We work closely with industry leaders like Meta, Ernst & Young, Mayo Clinic, Time Inc., the Government of Qatar, and U.S. government agencies including the Army and Air Force. We are expanding our team to accelerate the development of AI applications.

We believe that everyone should be able to bring their whole selves to work, which is why we are proud to be an inclusive and equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability status, gender identity or Veteran status.

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 [e-mail]. Please see the United States Department of Labor's Know Your Rights poster for additional information.

We comply with the United States Department of Labor's Pay Transparency provision.

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