Off the old estate,
without a rewrite.
Assessment first, then a phased path where every phase ends releasable and the system stays live.
What Attri’s modernization practice covers
A big-bang rewrite asks a business to stop shipping and trust that the replacement arrives. Attri works incrementally instead: assess the estate honestly, find the seams, and move it in phases that each end releasable.
Application modernisation
WebForms, WCF and older .NET onto current .NET, and monolith into services — incrementally, so the system stays releasable throughout.
Platform migration
SharePoint Server 2016 and 2019 left extended support on 14 July 2026 with no ESU programme. On-premise infrastructure moves to cloud the same way.
Data migration
Database, warehouse and CMS platform moves, with the existing estate kept running and supported while the new one is stood up.
What we build with
We build in the estate you already run, including the parts you inherited, rather than moving you onto what we would have picked.
- WebForms → .NET 8/10
- VB.NET
- WCF → REST
- SharePoint upgrade & migration
- Monolith → services
- On-prem → Azure / AWS
- Oracle / SQL Server migration
- Legacy warehouse → Snowflake / Fabric
- Sitecore upgrades
Where we put agents in a migration
Agents take on the work that scales with volume rather than judgement. What they produce goes to the engineer who owns that area before any of it ships.
Estate assessment
Agents read the codebase and configuration to produce the dependency map and risk ranking that decides phase order — the step a plan is worthless without.
Code translation
WebForms and WCF patterns converted to current equivalents as reviewed drafts, so engineers spend time on decisions rather than transcription.
Behaviour parity
Characterisation tests captured from the legacy system before the move, then run against the new one. Parity becomes evidence.
Put agents on your estate.
See how we scope, govern and deploy them — with the guardrails regulated teams need.
Tell us what you are running.
A system to build, or one you have inherited. Either way the first conversation is the same: what exists, what is breaking, and what has to stay live while it changes.