Senior Security Engineer, Lumos

• 5+ years of software engineering experience, with at least 3 focused on security (application, product, or platform security)
• A track record of designing, shipping, and operating production security systems, not only reviewing them. Examples: authentication and authorization frameworks, token and session management, secrets management, audit logging
• Strong backend skills. Python and TypeScript are a strong plus. Go is welcome
• Clear written communication. You can explain a risk and a trade-off to engineers, PMs, and customers alike

Desirable

• As a Senior Security Engineer at Lumos, you’ll shape the identity platform thousands of IT and security teams rely on to protect their data. You’ll build the security foundations every Lumos product runs on and be a trusted voice when our largest customers ask how we keep them safe
• Design and ship core security platform systems in the Lumos codebase, such as request context propagation across services, scoped API tokens, our authorization service, and decoupling authentication from synced identities
• Lead multi-sprint security projects end to end, coordinating with engineers on other teams to get them delivered
• Run security architecture reviews and threat models for new products (for example our MCP Governance gateway and on-device policy checks) before they scale, and turn findings into tracked, prioritized work
• Drive least-privilege access to our own production systems (databases, data pipelines, AWS IAM, secrets)
• Triage, route, and fix vulnerabilities from pentests, cloud assessments, and dependency scanning, and coordinate retests
• Take part in security oncall and incident response, and help answer security questions from customers and prospects