Mission

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

Sentinel Keep embeds with startups, scaled companies, and American industry to own greenfield builds, rescue lost projects, augment software teams, and ship production-grade systems 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.

02Embed without drag.

We can join an existing software team, lead a build, or operate independently around one hard problem. The shape follows the work, not a staffing or agency template.

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.

04Take over the hard part.

Greenfields, rescues, internal platforms, and entire product verticals all need the same posture: clarify the mission, own the tradeoffs, and get the system into production.

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

Embedded or independent.
Owning the outcome.

Embedded

Plug into an existing startup or enterprise team as a senior builder, technical lead, or quiet force multiplier.

Ownership

Take over greenfield products, stalled builds, internal platforms, or entire verticals. The work can start as a blank slate, a rescue, or a mandate that needs an owner.

Posture

Comfortable with frontier startups, public-company constraints, and American industrial operators. Small enough to move fast; senior enough to carry real responsibility.

Work

/ 01

Greenfield

Own zero-to-one products, internal platforms, prototypes, and new verticals from unclear brief to production software.

/ 02

Rescue

Step into stalled or lost projects, stabilize the architecture, recover momentum, and turn ambiguity into a shipping path.

/ 03

Embedded

Augment startup or enterprise software teams as a senior builder: hands-on implementation, technical direction, and delivery pressure.

/ 04

Team building

Help hire, structure, mentor, and raise the operating level of software teams while the product keeps moving.

/ 05

American industry

Support operators in defense, dual-use, hard-tech, manufacturing, logistics, energy, infrastructure, and other companies that need serious software inside real operations.

Field Record

Sentinel Keep is led by Aaron Stone, a principal engineer and software architect with field experience across enterprise-scale apps, cybersecurity, crypto, and finance.

/ 01

Global enterprise

Led software teams deploying web, iOS, and Android applications for KFC/Yum to 3M+ monthly active users.

/ 02

Cybersecurity

Built applications with SANS that embedded and fortified security practices for Fortune 100 organizations.

/ 03

Crypto / DeFi

Built core ledgering systems and DeFi financial instruments at Stable Sea, moving millions of dollars monthly.

/ 04

Finance

Embedded into teams at Clearco and spearheaded European banking expansion inside a traditional finance environment.

Engagements

If the work is consequential,
we should talk.

Direct

hello@sentinelkeep.com

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

Fit

Bring a greenfield mandate, a lost project, a team that needs senior leverage, or a vertical that needs a real owner. We'll sort the engagement shape around the work.