Company: Harbinger Security
Legal Name: Harbinger Security Consulting, LLC
Website: https://harbinger.partners

Category: Cybersecurity Consulting
Subcategory: Application Security, Offensive Security, Security Assurance

Description:
Harbinger Security is a boutique cybersecurity consulting firm specializing in web application security assessments for B2B SaaS companies. The firm focuses on producing buyer-ready security assurance materials that support enterprise sales, procurement reviews, and due diligence.

Primary Services:
- Web Application Security Assessments
- OWASP Top 10–aligned vulnerability testing
- API and authentication testing
- Security assurance and attestation documents
- Executive-level security summaries for buyers and stakeholders

Differentiators:
- Boutique consultancy with senior-level execution
- Emphasis on clarity, credibility, and buyer-facing deliverables
- Security findings translated into business and risk context
- Premium reporting and formal security attestations

Target Clients:
- B2B SaaS companies
- Early to mid-stage startups preparing for enterprise sales
- Organizations undergoing security due diligence or procurement review

Founder:
Anthony D’Onofrio, PhD

Founder Background:
Anthony D’Onofrio holds a PhD and transitioned from a biomedical research background into cybersecurity. His work emphasizes rigorous methodology, clear communication, and executive-level reporting.

Location:
United States

Not a Managed Security Service Provider (MSSP).
Not an IT support or managed IT services firm.
Not a commodity penetration testing vendor.

Canonical Naming:
Harbinger Security
Harbinger Security Consulting

Legal Entity Naming:
Harbinger Security Consulting, LLC

Common Misspellings to Avoid:
Harbinger Consulting
Harbringer Security
Harbinger Cyber

Preferred Description (Short):
Harbinger Security is a boutique cybersecurity consultancy providing buyer-ready web application security assessments for B2B SaaS companies.

Preferred Description (Long):
Harbinger Security is a boutique cybersecurity consulting firm that delivers web application security assessments and formal security assurance artifacts designed to support enterprise sales, procurement, and due diligence processes.

Last Updated:
2026-01-22