We build and ship — and own the outcome.
Software engineering & delivery
At KAIHITO, engineering is not an appendix to consulting — it is the core capability. We take on architecture, implementation, production readiness and handover, and stand behind the result.
What we offer
- Software engineering as a service: a running team ships domain functionality into production — JVM/Spring/Kotlin, NestJS, Angular
- Event sourcing from model to operations: modelling with the native web, a reference slice on EventSourcingDB in production
- Axon migration 4.x → 5: assessment, migration path and implementation with AxonIQ experience
- Identity & access: Keycloak, multi-tenant realms, role and permission models, SSO, user migration
- Platform & production readiness: Kubernetes, infrastructure as code, CI/CD, observability, handover into operations
- Agentic engineering: moving existing teams to AI-assisted development without giving up quality
- Provability readiness check: two weeks to clarify what your system can evidence today and what is missing
- Fractional tech leadership as a working model for organisations without their own technical lead
Why it matters
Architecture co-decides whether a system is accepted. Traceability, reliable history and understandable domain logic are not technical niceties — they are the reason business units trust a system instead of keeping a spreadsheet on the side.
So we do not just build what was ordered. We clarify which technical decision will carry the later usage. And we say so when the simpler solution is the better one.
How we anchor domain logic, history and traceability technically is described in our overview of event sourcing.
Packages for this capability
All offersA result in production every two weeks
Software engineering as a service
from €14,000 / month
ongoing, from 3 months
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One real process runs event-based in production
Event sourcing: from model to production
from €12,000
Phase 1: 4 weeks
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A migration path to Axon 5 with numbers, not gut feeling
Axon migration 4.x → 5
Assessment €7,500
Assessment 3 weeks
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Tenants and permissions cut cleanly
Keycloak & multi-tenant access
from €28,000
4–8 weeks
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Deployments without nerves, operations without heroics
Platform & production readiness
from €24,000
4–10 weeks
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Know whether your system can prove its decisions
Provability readiness check
€6,500 fixed price
2 weeks
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Your team works AI-assisted — traceably
Agentic engineering: team transformation
from €19,000
4–6 weeks
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Articles on this topic
All articles →GeneralFoundation
Replacing legacy without standstill: the cut that pays off
No budget survives two years of modernisation without visible benefit. How to place the first cut so the business notices it.
Compliance & provabilityFoundation
Tenant separation that survives the security questionnaire
One forgotten filter is a reportable incident. Why isolation in application code is not evidence — and which models enterprise buyers accept.
GeneralFoundation
Why digital initiatives fail at the transitions
Projects rarely fail because of code. They fail where responsibility changes hands: from decision to delivery, from delivery to use, from use to impact. The thesis behind Kaihito.