One team, start to finish
A senior Grail lead owns your rebuild from the first review. The same team stays accountable after the rebuilt system is live and handles every ticket that follows.
Legacy software modernisation for regulated enterprises
AI speeds up the build. Grail makes it safe to release. We recover the rules inside your legacy systems, rebuild in stages and test every change. You keep the code, data and final say.
Starting pointInherited stack
Older frameworks
Custom auth
Split data
Multiple backends
Production targetModern stack
React
TypeScript
PostgreSQL
Temporal
AWS
Why Grail
Move at AI speed without inheriting AI risk.
Most partners leave you with code, extra developers or another platform to manage. Grail’s engineering system is built for regulated, high-stakes production software. Not vibe-coded prototypes or disposable internal tools.
AI speed. Enterprise standards.
AI does the heavy lifting inside a controlled engineering system. Requirements, code and tests stay connected so work moves faster without compromising reliability or security.
Proven, with you in control
You own the code, data and decision on when the rebuilt system goes live. Every behaviour in scope is either preserved and proven by tests or changed with your sign-off.
Modernised, not just replaced
The rebuild does more than recreate the past. It introduces useful AI capabilities such as document extraction, intelligent search and assisted workflows. Each is tested and controlled like the rest of the system.
Built for regulated industries
For systems where a bad release has real consequences.
We work on critical software where reliability must be proven before every release. A failed change can stop operations, create compliance exposure or cause financial loss. We rebuild and test the systems teams can no longer afford to change without control.
Financial services
Modernise core and operational systems while keeping financial and regulatory control.
Healthcare and care services
Rebuild systems that support care teams without disrupting service delivery, data integrity or patient safety.
Government and public services
Update essential systems while preserving access controls, auditability and continuity for the people who depend on them.
Manufacturing and critical operations
Upgrade production and quality systems without stopping operations or breaking essential integrations.
Our approach
Rebuild without losing what already works.
We start by learning how your current software supports the business. Then we agree what should change, rebuild it in stages and prove it works before launch.
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01
Understand the current system
We work with the people who use and maintain the software to understand what the business depends on.
A clear view of what must be kept, fixed or improved.
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02
Agree the plan
Together, we decide what stays, what changes and how the new system will be checked.
A plan your team approves before development begins.
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03
Rebuild and test
We rebuild the software in stages and compare each part with the existing system.
Proof that each part works before it moves forward.
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04
Launch with control
We move users gradually, monitor the new system and remain responsible for fixes and future releases.
A controlled launch and one team accountable after the system is live.
Grail Platform
One platform to rebuild, release and run your software.
Those four stages stay connected in Grail Platform, from system discovery through live operations. Grail engineers use specialist AI agents to support analysis, implementation, reviews, testing, configured security checks and production monitoring where included. Your team sees the evidence and approves what moves forward.
Example release statusRequired tests passing · Security review complete · Awaiting client approval
Security and control
Built for your security and approval rules.
Grail Platform runs within the security and approval rules you set before work begins. We agree where code and data can be processed, who has access and who can approve a release.
Deployment boundaryYour approved cloud or private infrastructure
Grail PlatformVisible and controlled delivery
- 01Rules set before access
We only use the agreed tools and deployment setup.
- 02Separate client environment
Access is limited and can be revoked. Each client has a separate environment.
- 03You approve production
Named owners approve each release. Test results and rollback plans stay with the record.
- 04Tests and rollback ready
Automated checks and smoke tests must pass before traffic moves.
- 05Monitoring and ongoing support
Where included, release history, incidents and tickets stay visible in Grail Platform.
Selected projects
Selected work in critical systems.
Project 01 Aged care and workforce operations
Care-services marketplace platform
Platform recovery and rebuild
Production-ready in under 30 days
We took over an inherited codebase. We rebuilt the platform with a modern architecture, automated tests and production monitoring.
What was built
- Modern web application and workflow architecture
- Production permissions and cloud infrastructure
- Automated tests, security checks and monitoring
Build impact
Tested production platform ready for controlled releases Clear release process for future changesDelivery record
More than 400 tickets were reviewed with the client as work progressed.
Project 02 Crypto banking and transaction infrastructure
Transaction reconciliation layer
Critical system extension · Pre-launch
Clear controls for incoming and outgoing transactions
We added reconciliation and assertion checks to an existing .NET crypto banking platform. Expected transaction behaviour became clear and reviewable.
What was built
- .NET transaction flows mapped
- Transaction rules turned into system checks
- Incoming and outgoing reconciliation covered
- Assertion layer added for investigations
Build impact
Transaction rules written down as explicit system checks Reconciliation paths covered across incoming and outgoing flowsCurrent stage
The pre-launch control layer is complete. The team can now check transaction flows and investigate failures.
FAQ
Direct answers.
Do we need to replace the entire system at once?
No. We usually rebuild one part at a time. Each function moves only after it passes the agreed tests.
Is Grail a staffing firm or a software agency?
No. Grail provides a senior engineering lead and a managed delivery process. We own technical delivery against the agreed scope and tests.
What happens when the new system goes live?
The new system goes live in stages. New parts can run alongside the old system or serve limited traffic first. We monitor the results and keep a rollback plan ready.
Where should we start?
Start with one critical part whose behaviour can be measured. We map how it works and choose the safest first piece to replace.
How long does a rebuild take?
It depends on the codebase, access, test coverage and release risk. We set the first target date after the assessment. Project 01 reached production readiness in under 30 days. That is not a standard timeline.
How are engagements priced?
We price the first engagement around one critical system or business area. The price reflects size, security, testing and release risk. It is not based on lines of code or AI usage.
Legacy system assessment
Bring us the system everyone is afraid to change.
In 30 minutes, we will look at your system and find the safest place to start. This is a working session, not a sales pitch.
Best fit: Critical software with a clear owner and people who can review how it works.
Not a fit: Early MVPs, staff augmentation or projects with no accountable owner.