Where Precision Meets Purpose.
Five Nines Consulting is an AI-infrastructure startup. We build security products for the next generation of AI deployments and take on engagements where engineering discipline makes a measurable difference. PromptSentry, our flagship product, is the first to ship.
PromptSentry, AI Security Guardrail
Protects AI applications from prompt injection, jailbreaks, PII leaks, and explicit content, with a multi-stage detection pipeline that delivers an AI-verified verdict in under 900ms (p50). Benchmarked on 1,850 adversarial prompts with 98.92% attack defense accuracy across HarmBench, Garak, TrustLLM, and AdvBench.
Built for educational platforms protecting kids, and enterprises protecting their workforce.
A small team. Real engineering. Built to last.
Five Nines Consulting is an AI-infrastructure startup based in Roanoke, Virginia. We build security products for the next generation of AI deployments, with PromptSentry as our flagship: a multi-stage AI security guardrail used by educational platforms protecting kids and enterprise teams protecting their workforce.
Alongside the product, we take on consulting engagements in AI infrastructure, cloud, and security where careful engineering makes a measurable difference. Small on purpose. Focused on doing fewer things at a higher standard.
Read our full storyEngineering for AI infrastructure and the systems around it
Beyond PromptSentry, FNC takes on consulting engagements across AI deployment, cloud migration, security engineering, and custom development. Honest scoping. Real timelines. No surprises.
- AI Security
- AI Infrastructure Consulting
- Cloud Services
- DevOps
- Custom Development
We don't sell hype. We ship products that work, take engagements we can deliver on, and tell you the truth about timelines and trade-offs. That's the discipline part.