Replace legacy enterprise systems onto a modern runtime — without operational disruption.
A practice dedicated to replacing legacy enterprise applications — custom J2EE, 4GL environments, RAD / forms-based stacks, in-house ERP rewrites — onto the Airtool runtime. The institutional business logic is preserved ; only the technology underneath changes. Engine-specific migration paths are detailed at airtool.io.
The institutional logic survives the replacement
The years of accumulated business rules, edge cases and operational knowledge encoded in a legacy enterprise system are the asset. The technology underneath them is the liability. The replacement preserves the asset and changes the liability.
Incremental cut-over, not a flag-day rewrite
The business runs through the replacement. Components migrate piece by piece. The legacy and the modern run side-by-side until the cut-over is complete and verified.
From custom J2EE, 4GL, forms-based stacks and in-house ERPs
Common legacy starting points — Java EE applications grown beyond their original team, fourth-generation language stacks past their support window, forms-based development environments past their vendor's commitment, in-house ERPs that have outlived their original architects.
Senior engineering led — never a configuration project
A legacy replacement is an engineering programme, not an integrator engagement. The team that ships the platform delivers the replacement.
Where this practice sits between Deister and Airtool.
Deister's Services surface (under Services on this site) covers ERP transformation — programme-managed delivery of Axional ERP to an enterprise customer. The legacy-replacement practice is a different shape : the customer keeps the application they built ; only the underlying platform changes. The destination is the Airtool runtime.
The deep methodology, the engine-specific migration paths and the customer cases live at airtool.io. Start there for the technical detail ; come back here when the conversation moves to commercial shape and engagement model.