IdentityServer and .NET migrations for scale-up CTOs
Your team is busy shipping the roadmap. The IdentityServer4 server and the .NET 8 services still need moving before support runs out.
What you get
- ✓ A price and a timeline before work starts: IdentityServer4 → Duende migration from $9,600 (two 2-week sprints), Modernization Readiness Assessment from $4,800 (one sprint).
- ✓ Sprint-based work that slots beside your team without an FTE hire — one sprint minimum, pause or stop between sprints.
- ✓ Compatibility testing against your existing clients and APIs, with the move sequenced so auth never goes down.
- ✓ Everything stays in your repository: the migration plan, the tests, and the guardrail setup — CLAUDE.md, hooks, inventory — your engineers can keep using.
- ✓ Senior engineers only. The person scoping the migration is the person doing it.
Migrations are the work a growing team keeps deferring. They don’t ship features, and they’re risky enough that nobody wants to do them with half their attention. The deadlines don’t move, though: IdentityServer4 stopped receiving security patches in December 2022, and .NET 8 and 9 leave support on November 10, 2026.
We take the migration off your roadmap without taking your engineers off theirs. It starts with an $80 working session to scope the work; if a fixed-scope package fits, the session fee counts toward it. If the work is bigger than a package, it runs in 2-week sprints from $4,800, with the assessment’s sprint plan as the backlog.
What we leave behind matters as much as what we change. The plan, the compatibility and parity tests, and the guardrail setup we worked with are in your repository when we leave — readable by your engineers, and not dependent on tooling that leaves with us.
If you want to see how we work before booking anything, our IdentityServer4 → Duende migration log and .NET 8 → 10 migration benchmark are public.
Where to go deeper
- IdentityServer consulting and migration — the fixed-scope package and what it includes
- Legacy .NET modernization — the Readiness Assessment
- Sprint-based development — how sprints run beside your team
- IdentityServer4 → Duende: what actually breaks — the migration, logged