Senior Software Engineer - Security

Academic Key; United Kingdom; On-site; GBP 90,000 - 130,000; Full time

Benefits offered by this job

25 days annual leave

Learning Time

Job summary

Radiant, based in the United Kingdom, is seeking a Senior Software Engineer - Security to design, build, and operate security capabilities that protect our cloud platform and infrastructure. You will own security services from design through production, partnering with product, SRE, networking, security, and compliance teams to deliver scalable, automated protections across the platform.

The role emphasizes Identity, access control, secrets management, encryption, auditability, and policy

Qualifications

• Experience with cloud and network security, IAM, or security infrastructure.
• Hands-on engineering in one or more systems languages (Go preferred).
• Experience owning significant components end-to-end, from design through production.

Responsibilities

• Design, build, and own security services and platform capabilities.
• Automate policy enforcement, configuration hardening, detection, remediation, and software supply chain security.
• Implement strong tenant isolation and least-privilege access across the control plane and data plane.
• Support enterprise customer security reviews, audits, and incident response.
• Contribute to security engineering standards through code review and mentoring.

Skills

Go

Distributed systems

IAM / security infra

End-to-end ownership

Tools

HashiCorp Vault

OPA / Gatekeeper

SPIFFE / SPIRE

Kubernetes security tooling

Sigstore

SIEM platforms

Cloud KMS

Job description

As a Senior Software Engineer - Security, you will design, build, and operate the security capabilities that protect Radiant's cloud platform and infrastructure. You'll work across identity, access control, secrets, network security, platform hardening, auditability, and compliance controls. You'll partner closely with product, infrastructure, SRE, networking, security, and compliance teams, and with customers on their most demanding security requirements. This is a hands-on engineering role focused on making security embedded, scalable, automated, and easy to consume across the platform. You'll own significant security services from design through production, working alongside our Principal Engineers on their architecture.

Radiant · United Kingdom

Abroad United Kingdom ◷ Full Time Link validated

Key Responsibilities

• Design, build, and own security services and platform capabilities, and contribute to their architecture and technical designs.
• Build core security services across IAM, RBAC, workload identity, secrets, encryption and key management, audit logging, network controls, and policy enforcement.
• Turn product, customer, and regulatory requirements into well-designed APIs and implementations, working with the Security Product Manager and Principal Engineers.
• Automate policy enforcement, configuration hardening, detection, remediation, and software supply chain security.
• Implement strong tenant isolation and least-privilege access across the control plane and network and data plane.
• Support enterprise customer security reviews, audits, and incident response.
• Contribute to security engineering standards through code review, and support less experienced engineers.

Your Profile

• Strong hands-on engineering skills in one or more systems languages such as Go or similar.
• Solid experience building and operating distributed systems, with depth in cloud and network security, IAM, or security infrastructure.
• Experience owning significant components end to end, from design through production and operation.
• Strong technical knowledge across several of: Identity & access: IAM, RBAC/ABAC, OAuth 2.0, OIDC, SAML, SSO, federation, mTLS, workload and service identity
• Security controls: applied cryptography, encryption at rest and in transit, secrets management, KMS/HSM, key rotation, policy engines
• Infrastructure: Kubernetes internals, containers and runtime isolation, cloud networking, compute, storage
• Security operations: audit logging pipelines, detection engineering, vulnerability management, incident response
• Automation: policy-as-code, infrastructure-as-code, CI/CD security, software supply chain (signing, SBOMs, provenance)
• Experience with technologies such as Vault, OPA/Gatekeeper, SPIFFE/SPIRE, Kubernetes admission control and security tooling, Sigstore, SIEM platforms, cloud KMS, or similar.
• Good understanding of multi-tenancy, least privilege, zero-trust architecture, threat modelling, and shared-responsibility models.
• Familiarity with compliance frameworks such as SOC 2 or ISO 27001, and how they translate into technical controls.
• Able to balance security, performance, reliability, operational complexity, and developer experience.
• Clear written and verbal communication, including design documents and explaining trade-offs to your team and stakeholders.

What You Bring

• Security mindset: Think like an attacker and design systems that fail safely, without making them painful to use.
• Engineering excellence: Write well-tested, maintainable code and give thoughtful code reviews.
• Sound judgement: Make careful design decisions on systems that are hard to change once built.
• Collaboration: Work closely with Principal Engineers, product, SRE, and other teams, and help the engineers around you grow.
• Systems thinking: Understand how controls interact across the full cloud platform, from network and infrastructure up to APIs and user experience.
• Ownership: Drive security capabilities from design through production, operation, and continuous improvement.

Qualities we look for

• Set the standard: Every single day, you spot opportunities to constructively shake things up
• Inspire the change: There's no blueprint for the future. You'll embrace challenges and change
• You're real and you're true to yourself: We cherish and celebrate diversity so you'll feel right at home whoever you are and whoever you're talking to, you treat everyone the same.

Why should you join us?

What sets us apart is our blend of modern technology, competitive benefits, and an open, welcoming work culture that enables our people to thrive.

• 25 days of annual leave
• A culture that emphasises results over hierarchy, process & ego: we place great emphasis on the quality, ingenuity and creativity of work.
• Open communication, regular feedback: we value smooth collaboration, direct and actionable feedback, and believe that leading with empathy and a growth mindset makes us better together.
• Learning Time: we all have dedicated learning time to focus on new skills,