An old system often still does important work, but its developers are gone, documentation is missing and every change is a worry. We start with a thorough review and an assessment of the risks, then propose what to fix, what to rewrite and in what order. The system is updated piece by piece, so day-to-day work doesn't have to stop.
Example: a fictional company and made-up data.
The old desktop program
Customer card
Active
Record 1,214 of 3,862Filter: all2026-09-30
Migration in stages
The new system in the browser
Customers
UAB Tašas
ActiveMoved from the old program on 21 Sep 20263,862 customers and 41,207 invoices with their full history, no mismatches found
Contacts
Terms of sale
Change history
2024–2026
We took over a working platform, updated its technology and keep developing and maintaining it.
The platform we maintain has 30 pages, 19 API controllers and 25 data models.
Nuxt 4 / Vue 3, AdonisJS (Node.js), MySQL, Docker
2026Launching
A new website and online shop with an AI assistant: orders, enquiries and chats go straight into the CRM.
Every old address was kept or redirected, and AI chats enter the same enquiry pipeline as completed forms.
Next.js, TypeScript, MongoDB, language model
2026
Labels are printed straight from warehouse dispatches, pickups are booked, parcels tracked and returnable containers swapped, with parcel status updated every five minutes.
The new integration took over the parcels already in transit.
TypeScript, courier REST API, SQS, Jest
2025–2026
Our platform for apps: all data is kept on the device, the app works offline, and changes reach other devices in real time.
It runs at sync.helper.lt, and our own apps use it.
Rust, PostgreSQL, Flutter / Dart, Server-Sent Events
Sometimes, but it is usually safer to change the system in parts: the working parts stay, and ageing ones are replaced one at a time. We recommend a route only after the technical review, having weighed the cost and risk of both options.
We test the migration on a copy of the data first and compare the results with the old system, so before switching over we can see whether the history has come across in full.
A written report: how the code, data and infrastructure stand, where the biggest risks lie and what we recommend doing first. It comes with an estimate of the work.
Describe it in a few sentences – we'll reply and talk through how we could help.