AI POWERED LEGACY MODERNISATION
Modernise legacy platforms without losing the logic
Your legacy system works. The problem is nobody can change it quickly, maintain it cheaply, or explain how half of it functions.
TRUSTED BY HIGH-GROWTH FINTECHS
The Problem
Legacy migration is expensive, slow, and risky
Most migration projects run over budget and over time. The business logic that took years to build gets lost in translation, and teams end up rebuilding what they already had. We do it differently.
Business logic is scattered and undocumented
Rules live in application code, database triggers, batch scripts, and tribal knowledge. When the people who built it leave, the understanding goes with them.
Traditional rewrites take too long and break things
Eighteen-month migration timelines that slip to thirty months are common. By the time you finish, the target architecture is already dated - and you've introduced regressions the business discovers in production.
The longer you wait, the more expensive it gets
Maintenance costs on legacy platforms compound year over year. The engineers who can work on them become rarer and more expensive. Meanwhile, new features are impossible to ship at any reasonable pace.
How We Work
Six Phases Every rule traced end to end
Rather than rebuilding platforms from static requirement documents, we extract business logic directly from the live environment, reconstruct it within a modern architecture, and validate behavioural parity against the original system before any transition into production takes place.
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Extract
Parse source code, stored procedures, configs, and runtime behaviour into a structured knowledge base
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Model
Map extracted business rules, dependencies, and data flows. Validate with SMEs to catch undocumented behaviour
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Decompose
Break the system into independent migration work units that can be built and tested in parallel
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Generate
AI produces target code and test suites using pattern-driven templates, with business rules as context
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Validate
Five levels of equivalence testing - unit, integration, business process, performance, and UAT
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Roll out
Phased deployment with rollback triggers, dual-run comparison, and hypercare monitoring
What We Build
Platform modernisation for regulated fintechs
We work with the kinds of legacy systems fintech companies actually run.
Migration patterns
- Language and framework migration (e.g., .NET Framework to .NET Core, AngularJS to React)
- Platform migration - on-prem to cloud-native, monolith to microservices
- Database migration - Oracle to PostgreSQL, SQL Server to Aurora
- Integration modernisation - SOAP to REST, point-to-point to event-driven
- UI modernisation - thick client to web, legacy frontend to modern SPA
Systems we understand from the inside
- Card issuing and programme management platforms
- Payment processing and authorisation engines
- Reconciliation and settlement workflows
- Scheme integration and certification layers
- Back-office operations and reporting systems
How We Build
A modern platform not just a rewrite
The goal isn't just to move code from one language to another. It's to end up with a platform that's cheaper to maintain and faster to change.
Faster feature delivery
Once migration completes, your engineering team can ship new features in weeks instead of months. The modern stack removes the constraints that made every change expensive.
POST-MIGRATION VELOCITYLower maintenance costs
Eliminate the premium you're paying for engineers who can work on legacy technology. Modern stacks have larger talent pools, better tooling, and lower operational overhead.
REDUCED SME DEPENDENCYZero logic loss
Every business rule is traced from the legacy system through extraction, generation, and validation. A complete traceability matrix is maintained throughout and delivered at the end.
FULL AUDIT TRAIL
Why Panasa
Why Fintechs Choose Panasa
What sets us apart in the fintech development landscape
Fintech Domain Experience
We have 20+ years of experience working on card platforms, payment engines, and reconciliation systems.
Proven at Scale
We work with platforms processing 10M+ transactions monthly. We understand what that volume demands when it comes to migration risk and zero-loss deployment.
Full-Stack Team
A single team handles extraction, rebuild, and deployment. No handoffs between phases.
Compliance-First Approach
ISO 27001 certified, PCI-DSS aligned, GDPR compliant. Compliance is maintained at every stage of the migration.
Who This Is For
Fintechs ready to move off legacy platforms
Fintechs running platforms that are expensive to maintain and slow to change
Engineering teams spending more time on upkeep than new features
Organisations where key system knowledge sits with a handful of people
Fintechs preparing for scale but constrained by their current architecture
Teams that have tried rewrites before and run into cost and timeline overruns
How We Engage
Assessment
codebase review, business logic extraction, and migration scoping
Project-based
fixed scope, milestone-based delivery
Phased rollout
parallel run, staged deployment, and go-live support
Ongoing support
post-migration stabilisation and team handover
Trusted by Fintech Leaders
Feedback from fintech partners delivering secure, scalable, compliant card platforms.
We assigned payment platform integration work to Panasa, and they delivered to our utmost satisfaction. We wish Panasa Tech all the best for their future endeavors.
Aaron Holmes
Chief Executive Officer – Kani Payments
Frequently AskedQuestions
Everything you need to know about Panasa. From capabilities to how we deliver results.
Panasa provides end-to-end engineering, infrastructure, and operations support. We help design, build, scale, and run secure financial platforms reliably.
We work with issuer processors, neobanks, payment service providers, BaaS platforms, and programme managers across the UK, EU, and APAC regions.
Yes. We are ISO 27001 certified and PCI-DSS aligned. Compliance is built into our engineering and operations processes from day one, not bolted on afterwards.
Absolutely. We currently support platforms processing over 10 million transactions monthly, with multi-region deployments and 24x7 operational monitoring.
We are payment specialists, not generalists. Our team has 20+ years of experience in card platforms, scheme integrations, and regulated fintech environments. We offer end-to-end ownership from engineering through to 24x7 operations.