Mission

End-to-end software consulting for the modern front.

Sentinel Keep is a software consultancy building systems from zero to one for operators in crypto, fintech, AI, and defense. We ship production-grade software where the cost of failure is non-trivial.

Begin engagementAccepting Q3 · 2026

Principles

01Build for the edge case.

We design for the hour when nothing works. Resilience is a property of how a system is built, not something added after.

02Ship to production.

Every engagement ends in deployed, observable software you own. Not slide decks, not research reports, not a handoff email — running systems, with us on call until they are.

03Earn the complexity.

We start from the smallest architecture that could possibly work and add only what the workload demands. Every layer should justify itself.

04Earned experience.

Over a decade of hands-on work building complex, mission-critical systems in production. We take on engagements where that experience directly applies.

05Own the outcome.

We measure the work by what runs in production — not by hours on a timesheet or artifacts in a deck. Whatever the engagement model, we stay accountable to the result.

About

A small practice.
A narrow doctrine.

Structure

You work directly with the people writing the code. No account layer, no offshore relay, no handoffs between who you meet and who ships.

Frontier

We build on the bleeding edge. Deeply engaged with AI and the current frontier of developer tooling — used judiciously, in the service of the work.

Posture

Independent and privately held. Free to refuse work that isn't a fit, and to say so early.

Sectors

/ 01

Crypto

Protocol engineering, decentralized finance, custody, on-chain infrastructure, market systems.

/ 02

Fintech

Ledger design, payments rails, compliance tooling, transaction integrity.

/ 03

Evaluation systems, inference infrastructure, agent orchestration, observability.

/ 04

Defense

Dual-use software, mission systems, secure data pipelines, edge compute.

/ 05

Adjacent

Dual-use startups, hard-tech operators, and teams building systems that demand the same discipline.

Engagements

If the work is consequential,
we should talk.

Direct

hello@sentinelkeep.com

Prefer email? Write directly. Same inbox, same response window.

Fit

We take on a small number of engagements each quarter. Expect a short back-and-forth before we commit, so we're both confident in the fit.