Staff Application & Product Security Engineer

OpenKrill; United States; On-site; USD 160,000 - 180,000; Full time

Benefits offered by this job

Remote work environment

Health benefits

401k match

Paid parental leave

Flexible PTO

HSA and FSA options

Employee Assistance Program

Job summary

Cleo Communications US, LLC is seeking a Senior Product Security Engineer to lead and mature security across the product lifecycle, including SSDLC, vulnerability management, and incident response. You will bolster secure defaults, RBAC, and customer-facing advisories while collaborating with Product, CTO, and Architecture to prioritize and ship security features.

The role emphasizes threat modeling for AI-enabled features, rigorous testing, and coordinated disclosure.

Qualifications

• 6+ years in application security, product security, or secure software engineering, with experience maturing an AppSec program across multiple teams.
• Strong object-oriented developer: proficient in an OO language; Java preferred; read, debug, and write production code; comfortable with TypeScript, Python, or Go.
• Deep knowledge of application attack surfaces: authentication, authorization, API security, business-logic flaws, modern service architectures.
• Hands-on experience integrating and tuning SAST, SCA, and secrets scanning in GitHub and CI/CD pipelines.
• Hands-on exploit reproduction and patch validation: reproduce vulnerabilities, confirm fixes, and document communications.
• Coordinated disclosure experience with external researchers and customers, including CVE timelines.
• Product security experience on shipped software with an installed base: defaults, hardening guidance, advisories, and customer RFIs.
• Experience running threat modeling, design reviews, and manual security testing with developers for remediation.
• Clear communicator who can translate risk into engineering guidance and gate releases with leadership.

Responsibilities

• Own SSDLC maturation: security requirements, threat modeling, and design reviews for high-risk changes, APIs, and integrations.
• Run risk-based triage, remediation, and verification for vulnerabilities; reproduce externally reported issues and validate patches.
• Own the penetration testing program: scope engagements, perform testing, and validate findings.
• Run Vulnerability Disclosure Program including researcher communications and coordinated disclosure.
• Coordinate CVE lifecycle for Cleo products and support product-security incident response.
• Own security controls in Cleo's NIST CSF 2.0 program: track maturity, close gaps, provide audit evidence.
• Own security posture across SaaS and customer-hosted deployments: secure defaults, access controls, hardening guidance.
• Roadmap security features with Product Management and CTO, including SSO/SAML upgrades, RBAC redesign, and customer-requested controls.
• Triage customer vulnerability scans and reports, answer RFIs, author advisories and release notes.

Skills

AppSec program leadership

Java

TypeScript

Python

Go

CI/CD pipelines

SAST/SCA integration

Threat modeling

Vulnerability remediation

Security training

Tools

Snyk

GitHub Advanced Security

Semgrep

Burp Suite

CycloneDX

SPDX

AWS

Kubernetes

Terraform

Jenkins

Job description

Essential Duties & Responsibilities

Secure development lifecycle and guardrails

• Own and mature Cleo’s SSDLC: security requirements, threat modeling, and design reviews for high-risk product changes, APIs, and integrations.
• Run and tune SAST, SCA, secrets detection, container, and IaC scanning.
• Build reusable secure patterns, reference implementations, and policy-as-code controls that make the secure path the default path.
• Own developer security enablement: Security Champions meeting, deliver the engineering security training campaigns, grow a named champion in every squad, and give developers practical remediation guidance, office hours, and self-service security capabilities.

Product vulnerability management

• Run risk-based triage, remediation, and verification for application and product vulnerabilities, including remediation SLAs, escalation, and exceptions. Reproduce externally reported vulnerabilities against running product instances and validate patches before release.
• Own the penetration testing program: scope and coordinate third-party engagements, perform targeted testing yourself, and validate findings through retesting.
• Run our Vulnerability Disclosure Program, including researcher communications and coordinated disclosure.
• Coordinate the CVE lifecycle for Cleo products and support product-security incident response.
• Own the application and product-security controls in Cleo's NIST CSF 2.0 program: track maturity, close gaps, and produce the evidence our audits rely on.

Product security

• Own the security posture of the products Cleo ships, across SaaS and customer-hosted deployment models: secure defaults, authentication and session controls, RBAC and tenant isolation, admin data access, security-relevant configuration, and hardening guidance for customers.
• Own the Product Security Roadmap: partner with Product Management, the CTO, and Architecture to get security features prioritized and shipped, including SSO/SAML upgrades, the in-app RBAC redesign, endpoint-level access control, and customer-requested controls, and represent security in RTE Sync and Boundary Review.
• Be the technical owner for customer-facing product security: triage customer vulnerability-scan findings and penetration-test reports against Cleo products, answer security RFIs and enhancement requests, and author customer-facing advisories, security release notes, and hardening documentation.

AI Fluency Competencies

• Own threat modeling and security review for LLM-enabled product features, AI agents, and AI-assisted development workflows.
• Build controls and secure patterns for prompt injection, sensitive data exposure, insecure output handling, excessive agency, insecure tool integrations, and AI supply-chain risk.
• Apply and operationalize the OWASP Top 10 for LLM Applications and the NIST AI Risk Management Framework across product and engineering.

Prerequisites

• 6+ years in application security, product security, or secure software engineering, including experience building or maturing an AppSec program across multiple engineering teams.
• Strong object-oriented developer: Strong proficiency in an object-oriented programming language is required, with Java preferred given Cleo’s core products are Java-based. You should be able to read, debug, and write production-quality code and be comfortable working across languages such as TypeScript, Python, or Go.
• Deep knowledge of application attack surfaces: authentication, authorization, API security, business-logic flaws, and modern service architectures.
• Hands‑on experience integrating and tuning SAST, SCA, and secrets scanning in GitHub and CI/CD pipelines.
• Hands‑on exploit reproduction and patch validation: you can take a researcher's report of a pre‑authentication vulnerability, reproduce it against a running Java web application, confirm the fix, and write up what the researcher and the customer each need to hear.
• Coordinated disclosure experience with external security researchers and customers, including holding an embargo timeline and driving a CVE to publication.
• Product security experience on shipped software with an installed base: secure defaults and hardening guidance, customer‑facing advisories and security release notes, and turning a customer's scan report or RFI into a fix‑or‑explain response.
• Experience running threat modeling, design reviews, and manual security testing, and working directly with developers through remediation.
• Clear communicator who can turn technical risk into engineering guidance for both developers and executives, and who can hold a release‑gating decision with Engineering leadership when the risk warrants it.

Nice to Have

• Securing LLM applications, AI agents, or AI‑assisted development tools.
• SBOM (CycloneDX/SPDX), VEX, artifact signing, and SLSA.
• AWS, Kubernetes/EKS, Terraform, Jenkins.
• Snyk, GitHub Advanced Security, Semgrep, Burp Suite.
• NIST CSF 2.0, OWASP SAMM/ASVS, NIST SSDF; supporting SOC 2 or ISO 27001 audits.
• CSSLP, OSWE, GWAPT, AWS Security, or comparable certifications.
• Enterprise software with both SaaS and customer‑hosted deployment models; SSO/SAML, RBAC design, and multi‑tenant isolation; MFT/EDI or other B2B integration products.

A few things we have to offer:

• Compensation: $160,000 to $180,000 + Bonus Opportunity
• Great Healthcare + Dental + Vision
• Flexible PTO
• Culture of support, encouraging Life-Work balance
• 401k match
• FSA and HSA options
• Employee Assistance Program
• Paid Parental Leave
• Remote work environment
• Representing a company with 4,000+ clients and a 99% retention rate
• Accelerated title and salary growth potential
• A fun and energetic work environment that makes you excited to go to work every day

We use artificial intelligence (AI) tools to assist in certain stages of our recruitment process, such as resume screening and candidate matching. These tools are designed to support fair and consistent evaluations. If you have questions about this process or would like to request an alternative assessment method, please contact us at [e-mail].

Cleo Communications US, LLC is an equal opportunity/affirmative action employer, and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability status, protected veteran status, or any other characteristic protected by law.