Automated parity suite
Written against the old system before the new one exists, so every phase proves it behaves the same.
Before any new code is written, we build an automated suite against your existing system. Every phase of the migration ships only when that suite passes on both. A named senior engineer signs off every change.
No rewrite. No feature freeze. No big-bang cutover.
Check if your module qualifiesThe framework is years past end of support, and security questionnaires are starting to fail.
One or two developers hold all the context, and neither can be spared for six months.
A previous attempt stalled halfway, or never started because nobody could estimate it.
Nobody can prove a change didn't break existing behaviour — so nothing gets changed.
Written against the old system before the new one exists, so every phase proves it behaves the same.
Each phase ships on its own. No freeze, no big bang.
No AI-assisted change reaches a pull request without a named senior engineer signing off. QA validates every cutover.
Architecture decision records, an operational runbook, and a parity report per phase.
CakePHP 4 to Laravel 12, in production since 2018: 256 controllers, 150,000 lines. Strangler Fig over a single shared database — no data migration.
Migrated module by module alongside the live service, with no data migration and no interruption to it.
Frontend architecture allowing Vue 2 and Vue 3 to coexist, so components migrated gradually with no pause in feature delivery.
Later adopted as the company-wide standard.
Spanish market opened on a legacy Symfony application, with A/B testing running in production on an unsupported Vue 2 frontend.
No rebuild.
Before anyone writes new code, we write an automated suite against your existing system. It defines what "the same behaviour" means, in code, so the migration has a finish line nobody can argue with.
The suite is yours whether the migration is done by us, by your team, or not at all.
S US$ 3,500 · M US$ 5,000 · L US$ 8,500, sized by the number of flows under test.
We confirm your module qualifies before you pay: production system, reachable staging, test users per role.
Check if your module qualifiesYour client has an old PHP app and you'd rather not touch it blind. We deliver the Parity Baseline under your name or alongside you. The suite lands in your client's repo, the account stays yours, and our contract includes a 12-month non-solicit on your clients.
Klim Works is led by Rodrigo Klim, tech lead on the migration described above. Every engagement has a named senior engineer accountable for it.