One developer built it. He left and nobody understands the code
We audit the code and database, then document the logic and cover it with tests. The system stops being a black box.
Rewrite your legacy system on a modern stack, one module at a time
Legacy software gets more expensive to change every year. We migrate it in stages, so your business keeps running. The result is a solid base for your website, customer acquisition and automation.
Quote and schedule after your brief
Who it's for
- Owners whose CRM, ERP or internal tool was written 8–15 years ago and nobody dares touch it
- Companies where one developer holds the whole system in their head
- Teams that cannot add payments, an AI agent or a new CRM because the old system cannot connect to anything
- Businesses running on unsupported PHP,.NET or database versions with no security updates
Problems we solve
Every new feature breaks something else and takes months
We split the system into independent modules and migrate them one by one. New features stop putting the rest at risk.
We cannot afford downtime during the switch
Old and new systems run in parallel. Users move in groups, and rollback stays available until migration is complete.
The old system does not integrate with anything modern
We build an API (a standard way for software to exchange data). Through it we connect payments, CRM, AI agents and automation.
What's included
- Audit of code, database, servers and integrations
- Feature map: what to keep, rewrite or drop
- Stack selection for your case (for example TypeScript, Python, PostgreSQL)
- Data migration with verification: records compared before and after
- Module-by-module rewrite with automated tests
- API for payments, CRM and third-party integrations
- Parallel run of old and new systems during the transition
- CI/CD (automated releases), backups and monitoring setup
- Documentation and handover of the repository and all access to you
- Staff training and post-launch support
Choose the scope
Use a package to describe what you need. We agree on the quote and schedule after reviewing your brief and requirements.
01
Audit and plan
Teams not yet sure whether to rewrite at all
- Review of code, database and servers
- Risk and dependency map
- Comparison: rewrite, upgrade or replace
- Staged plan with a fixed estimate
02
Pilot module
Teams that want to test the approach on one part of the system
- One module on the new stack
- Migration of its data
- Integration with the old system
- A measurable KPI: speed, error rate or operation time
03
Full modernization
Multi-module systems with real users
- Staged rewrite of the whole system
- Migration of all data
- API and integrations
- Parallel run and team training
- Documentation and access handover
How we work
Brief and requirements
You describe the task and current workflow. We clarify requirements, choose a first stage and prepare a quote.
Plan and KPI pilot
We pick a starting module and agree on the number we will judge the result by.
Staged migration
We rewrite modules one by one. You pay in stages and see working software after each one.
Parallel run
The new system runs next to the old one. We reconcile data and move users in groups.
Handover
You receive the code, documentation, accounts and access. Everything is yours under the agreed terms.
Scope and limits
- We do not promise a rewrite in a few weeks: the timeline depends on code and data condition
- We cannot guarantee old code can be recovered: with no source, we rebuild the logic from observed behavior
- We will not push a rewrite when an upgrade is enough: the audit will tell you plainly
FAQ
Will my business stop during the migration?
Not if it is planned properly. Old and new systems run in parallel and users move in groups. A short downtime may happen at the final cutover, and we agree on it with you in advance.
What do you need from me at the start?
Access to the code, server and database, plus someone who knows the business logic. If the source code is missing, tell us up front. It changes the estimate and the plan.
How do you estimate the cost?
We prepare a quote after reviewing your brief and requirements. A first stage can cover: review of code, database and servers; Risk and dependency map. Scope, payment and schedule are agreed before work starts.
Can't we just upgrade the old system?
Sometimes yes, and it is cheaper. The audit shows whether a rewrite is worth it or dependency upgrades and refactoring (cleaning code without changing behavior) are enough. We will tell you which is better in your case.
Who owns the code and accounts?
We agree on the handover of code, materials and account access before work starts. Third-party licences and services are listed separately when needed.
How does this fit with the website, customers and automation?
It is the base everything else relies on. With clean data and an open API, your site gains features faster, ads feed into the system without manual work, and AI agents and CRM connect without workarounds.
Start with your task
Describe your business, the outcome you need and your current workflow. We will clarify the requirements and prepare a quote after your brief.