Built for environments where every decision must be defended.
Expressible deploys inside your boundary and is architected for the strictest environments. Your data never leaves your perimeter, every decision is recorded, and the control architecture is designed to meet federal and regulated frameworks — with formal authorization pursued inside your authorization boundary.
Deployment & data sovereignty
The platform runs where your data lives. There is no requirement to send content to a vendor cloud.
Air-gapped & on-premises
Deploy in your own data center, your managed cloud, or a fully isolated network with no internet connectivity.
Zero outbound telemetry
No external API calls are required at runtime. Nothing phones home.
No training on your data
Your content is used to answer your questions, never to train a shared model.
Single-tenant isolation
A dedicated, isolated deployment per customer — no data shared across tenants.
Data residency
Your data stays in the region and environment you choose.
U.S. & allied model provenance
Defense deployments run on U.S. and allied open-weight models, served inside your boundary.
Data protection
- AES-256 encryption for data at rest
- TLS 1.3 for data in transit, enforced end to end
- Logical and physical separation between deployments
- FIPS-validated cryptography available for federal deployments
Access & identity
- Role-based access control with least-privilege defaults
- SSO via SAML 2.0 / OIDC, integrating with your identity provider
- Multi-factor authentication and managed sessions
- US-person-only access handling for ITAR-controlled engagements
Auditability is the point, not an afterthought
Every governed interaction and material platform action is captured in an append-only record, available for internal review, compliance audits, regulatory examination, and legal discovery.
Append-only audit trail
Queries, retrieved sources, recommendations, confidence, human overrides, and executed actions — timestamped and attributed.
Decision records
Each deliberation is preserved with hypotheses, dissent, and citations — exportable as a defensible report.
SIEM export
Audit events can be exported to your security monitoring stack.
Security in the delivery pipeline
Where the platform generates or transforms code, security review is embedded into delivery rather than performed after the fact. Findings are classified by severity, mapped to common-weakness identifiers, and preserved as part of the record.
Coverage spans the OWASP Top 10 and additional common weakness categories, with file-level references and remediation guidance.
- •Static analysis against OWASP Top 10 and CWE categories
- •Findings classified by severity with remediation guidance
- •Generated code free of unsafe dynamic execution (CSP-safe)
- •Results preserved in the audit record, not discarded
Compliance posture
The platform's control architecture is designed to meet the frameworks below. Where a framework requires a formal authorization, we pursue it inside your authorization boundary as part of the engagement — for example, an agency ATO is achieved within the customer's environment.
FedRAMP
Control families aligned; path to ATO within your authorization boundary.
CMMC Level 2
Practices implemented for controlled unclassified information handling.
DoD IL4 / IL5
Deployable into impact-level environments within the customer's accredited cloud.
PCI DSS
Encryption, access control, and audit controls aligned to PCI requirements.
HIPAA
Safeguards aligned to the HIPAA Security Rule for protected health information.
ITAR
US-person-only access and in-boundary processing for controlled technical data.
Expressible is an early-stage company and does not represent these as completed third-party certifications. We are happy to share our current control documentation and authorization roadmap under NDA.
Talk to our team about your security requirements
We'll walk through deployment options, control mappings, and the authorization path for your environment.