11 years of technical excellence trusted by

Why do it now

(01)

Old versions of PHP, Ruby and other stacks have become a security risk.

Major upgrades bring breaking changes, and engineering teams are busy with the roadmap. This is where we come in.

01AI models find and publish more vulnerabilities in widely used software, from Linux to PHP
02Attackers use AI to exploit them at a scale never seen before
03The fix usually ships only for the latest version
04Many platforms still run older versions, with little test coverage and thousands of users every day

Verification first,
then the rewrite

(02)

In a legacy rewrite or a major refactor, changing the code is no longer the hard part. Proving the new version behaves exactly like the old one is. So before we change anything, we build a verification harness that checks every change.

Unit and integration tests

Fast checks on the business logic and on the seams between components.

End-to-end tests

Real user journeys run in a browser, from login to the flows that make you money.

Mutation testing

We deliberately break the code to check the tests catch it. It is how we measure the quality of AI-generated tests.

Traffic replay

Production traffic, recorded and anonymised, replayed against the baseline and the candidate to find every difference.

Hold-out scenarios

Test cases kept away from the agents writing the code, so passing them proves real behaviour, not tests written to pass.

Differential testing

The same inputs go to the old and the new system side by side. Any difference is a bug until proven otherwise.

Case studies

(03)

Agentic engineering

How we rewrote SQLite in five languages without hand-writing a line of code

One neutral specification, five generated database engines and a WebAssembly build, all checked against SQLite’s own test corpus. Here is how it worked, and what it does and doesn’t prove.

Read how we did it

5
engines: C, Rust, Zig, Go, Python, plus WebAssembly: 622
sqllogictest files used to verify them: 0
lines of engine code written by hand

Hover to play

Swag.com · E-commerce

We helped turn a fax-and-email industry into a platform. Then Custom Ink bought it.

Hover to play

Koyfin · Fintech

Professional market analytics, built for the investors Bloomberg priced out.

“Aleph One is an extension of our team, not merely a contract firm to complete projects. They possess high ownership and are highly dependable.”

Scott Bedard — VP Engineering, Custom Ink

“The AlephOne team is one of the best tech teams I have worked with. I am impressed by the volume of work the team is able to accomplish, and the quality of the work released.”

Geeta Arora — General Manager, SWAG.COM

Bring us
the hard part.

Tell us what you’re running and what worries you about upgrading it. We’ll come back with questions and a first view on scope, risk and timeline.

Refactoring,migrationsand full‑on rewrites