What is Centennial?
Centennial Systems is a boutique practice for founders, operators, and enterprises shipping financial infrastructure. Product, security, and embedded engineering for teams where a quiet failure costs more than the engagement.
Small by design. We take on work we care about, scope it around what you actually need, and stick around until it ships.
What we offer.
Centennial runs on three disciplines and no more. We dive into the smallest of details before engaging. If the fit is wrong, we say so in a day.
Product
Full strategy and embedded execution across roadmap, prioritization, launch, and GTM. We work alongside founders to save time on the decisions that matter and make more money on the ones that ship. Expertise in blockchain-native banking, DeFi, modern fintech, and AI-native companies.
Security
Adversarial architectural reviews, security-driven system design, and drafting company-wide security policies. Fractional CISO and opsec coverage for teams between security leaders.
Engineering
Embedded build work across crypto, fintech, and AI systems. Delivered to production and handed over to your team. One engagement at a time.
A CISO, without the hire.
For teams between CISOs, or carrying a security program heavier than the org chart supports. A two-week diagnostic becomes a fractional retainer, or a clean handover to whoever you hire next.
Begin · two-week Intake Sprint
A paid diagnostic to fully understand your security and opsec setup, not a deck.
- Security and opsec intake memo: owners, gaps, operating risks, immediate priorities.
- Ten-item, firm-specific risk register. Not generic SaaS risks.
- One deep threat model on your highest-sensitivity workflow.
- One incident tabletop, run with your on-call and exec teams.
- Ninety-day roadmap your security function can execute against.
Continue · Fractional CISO retainer
Own the security and opsec program on an ongoing basis.
- Security roadmap, risk register, executive updates, audit readiness.
- Custody and opsec threat modeling: key replacement, recovery, advisor verification, enterprise signing.
- SOC 2 Type II continuity: access reviews, vendor reviews, control testing.
- Product security: adversarial review of mobile, backend, release pipeline, supply chain.
- Incident readiness: tabletops on social engineering, endpoint compromise, key rotation.
- Enterprise trust: security questionnaires, posture narratives for treasury and government prospects.
- Researcher and bug bounty operations: intake, triage, researcher SLAs.
FAQ
How large is the firm?
A two-person practice, with a small bench of named collaborators pulled in by mandate. If you hire Centennial, you are working with the founders directly, every week.
What does an engagement cost?
Disclosed in the brief reply, priced on scope. Audits and sprints are fixed fee. Builds are project fee. Advisory is a quarterly retainer. If the fit is wrong, we say so and point you elsewhere, usually within a day.
Will you sign our NDA?
Yes. The majority of the record is under NDA and is shared only on introduction.
How do I begin?
Send a few lines on the problem to the email below. A written reply within two business days, and a thirty-minute call if the fit is plausible. No intake form, no sales sequence.
Send us a note.
A few lines on the problem is enough. If the fit is wrong, we will say so quickly and point you to someone better suited.