Why we exist
Developers, dev shop leads, and staff engineers make security decisions based on code, not marketing copy. They want to see the implementation, run the demos, and read the eval results before they trust anything with their prompts.
We built Purfect Labs around that reality. Every claim on this site has a reference implementation behind it with a passing eval suite as proof. If you ask us how Shield handles credential detection under SSE streaming at the byte level, we can show you the test.
We're not a large agency. We're a small team of senior engineers who work directly with clients, and we intend to stay that way.
What we believe
Code ownership, always.
A vendor relationship that requires you to keep paying to keep your system running is a liability, not a service. Every engagement ends with a source code handoff and a runbook. You own it forever, no license server, no kill switch.
Principals on every project.
The engineers you talk to in the scoping call are the engineers who build your system. There are no juniors on your project. There are no account managers in the middle. You get the people who designed the system.
Fixed price, full scope.
No hourly billing, no scope creep surprises, no retainer that compounds every month. Every engagement is scoped and priced upfront. You know exactly what you're paying before we start.
Prove it or don't say it.
Claims without evals aren't engineering, they're marketing. Our work ships with test suites, threat model workshops, and documented failure modes. If you ask how something works, we show you the code.
Your infrastructure, not ours.
The tools we build run on your servers, your CI pipelines, your developer workstations. We don't operate your workloads after handoff. When we deploy a security gateway, your data never touches our systems.
Built by engineers, for engineers
Shield guards our own machines first. The gateway, the filter packs, the evaluation harness. We run everything we ship, every day, on our own work. We don't sell anything we haven't already bet on.
We're model-agnostic where it matters. Shield sits in front of whatever model you use, Anthropic, OpenAI, Google, or local open-weight models. Your provider choice is yours; our job is making sure your secrets never reach it.
If that's the kind of shop you want guarding your AI stack, we'd like to hear from you.