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Legacy Software + AI Modernization

Modernize what you have and add AI without a risky rebuild.

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The problem

The system works, mostly. Nobody wants to touch it, every change takes weeks, and the AI ideas stay ideas because the data is locked inside. A rewrite would take a year and break what still earns money. Modernization in steps keeps the business running while the software improves underneath it.

What we build

  • An API layer over the existing system so new features and AI can use its data safely
  • Database, auth and performance upgrades delivered one module at a time
  • Cloud migration and monitoring so the platform becomes cheaper and safer to change

Backend modernization, API layer, Database modernization, Cloud migration, Auth upgrades, Performance

How it works

  1. 01

    Assess

    Code, data, dependencies and risks mapped; the modules worth keeping, wrapping or replacing named.

  2. 02

    Wrap

    An API layer and tests around the current system before anything is changed inside it.

  3. 03

    Replace in slices

    One module at a time, with feature flags and a rollback path for each.

  4. 04

    Add AI

    Retrieval over existing data, agents beside existing workflows, once the foundation can carry them.

Work that proves it

  • Nat.app home page: a personal CRM for relationship building, beside a contact list preview

    Nat.app

    Relationship CRM with Gmail, Calendar, Stripe and Segment

    Designed and developed for the client: relationship data model and the Gmail, Calendar, Stripe and Segment integrations.

  • Bizzey home page: business software for freelancers, beside a dashboard of financial performance

    Bizzey

    Business management SaaS: CRM, invoicing, projects, time, payments and expenses

    Designed and developed for the client: CRM, invoicing, projects and time tracking inside one workspace.

  • Webhook Relay home page: forwarding webhooks anywhere, beside a wireframe globe of connections

    Webhook Relay

    Webhook and API infrastructure with SOC 2 Type II, SSO and audit logs

    Designed and developed for the client: webhook forwarding and replay, tunnels, and the audit and access-control surface.

What you get

  • Assessment report and modernization plan

  • API layer with tests

  • Migrated modules with rollback plans

  • Upgraded auth and database

  • Monitoring and cost report

  • Documentation

Questions

What's included in a modernization engagement?
An assessment report that names what to keep, wrap or replace, and the modernization plan that follows from it. Then the work itself: an API layer with tests around the current system, modules migrated one at a time with a rollback plan each, upgraded auth and database, monitoring and a cost report, and documentation written for the people who inherit it.
How long does a modernization run?
The assessment takes one to two weeks. After that, slices ship every two to three weeks and you decide how many you want. What drives the pace is test coverage on the current system, how tangled the data model is, and whether the original authors are still reachable. Nothing here is a year-long rewrite you have to wait out.
What do you need from us?
Read access to the code and a copy of the database with the sensitive fields masked, plus whoever knows why the odd parts are odd — an hour with that person saves a week of reading. We also need to agree early on which parts of the system must not change this year.
Who owns the code and the data?
You already do, and that does not change. We work in your repository and your environments, and every migrated module is merged into the codebase you own. Handover is a documented plan per module, the runbook and a walkthrough with your team.
Can you modernize without a freeze on new features?
Yes, and that is the point of working in slices. The API layer and the tests go around the existing system before anything inside it changes, so your team keeps shipping while modules move underneath. Each slice ships behind a feature flag with a rollback path, and we agree the order so the module your roadmap needs next is the one we do first.

Not sure where to start?

Describe the problem in a few lines. You get a straight answer on what we would build and how long it takes.

Book a 5-minute growth call
Book a 5-minute growth call