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Assess before anything moves
We review code, data models, batch schedules and interfaces, and record risks and options per component.
Regulated financial systems
Banking legacy system modernization, one controlled step at a time
Core banking, payments and batch processing moved in small, tested steps with old and new running side by side. Your risk, compliance and audit teams set the rules.
- Assessment and a written roadmap first
- Parallel run and rollback points in the plan
- Your controls and auditors set the rules
Banks and fintechs rarely run one legacy system. They run a core ledger, a payments hub, nightly batch, card or loan platforms and many interfaces. Modernizing means deciding, component by component, what to move, wrap, replace or leave alone.
We start with an assessment of code, data and integrations, then write a phased roadmap before any migration begins. Migration proceeds in small slices beside the existing system, with a way back at each step. See mainframe modernization and COBOL modernization for the technical methods.
This page describes a method, not a regulatory position. Your own compliance obligations, risk committees and auditors set the rules, and we align to them. We claim no certification and give no legal advice.
Problems we are usually asked to solve
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Shrinking batch windows
Settlement, interest and statement jobs run in a window the business keeps asking to shorten.
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Rules buried in COBOL
Fee, limit and interest logic sits in copybooks that few people can read, with no tests.
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Point-to-point interfaces
File transfers and message adapters pile up, and nobody knows what breaks when one changes.
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Scarce skills
The engineers who understand the core are close to retirement.
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Audit evidence by hand
Reconciliation and reporting rely on manual steps and spreadsheets that auditors must take on trust.
How we run a banking modernization
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Write the roadmap with your risk team
Phases, rollback points and the evidence your auditors will want are agreed in writing before migration starts.
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Capture behavior with tests
Characterization tests record what the current system does, including rounding and edge cases.
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Pilot one slice in parallel
A narrow function runs on the new platform while the old one stays authoritative, and outputs are reconciled line by line.
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Move in phases and retire last
Each phase has a go or no-go review. A component is switched off only after its replacement has matched it over the cycles you agree.
Wrap, replatform, refactor, rebuild or retain
| Good fit when | Poor fit when | |
|---|---|---|
| Wrap with APIs | Core is stable, access is the issue | Core logic itself must change |
| Replatform | Code is sound, platform is costly | Code is poorly understood |
| Refactor in steps | Domains are separable | Data is tightly shared |
| Rebuild | Product is changing anyway | Rules cannot be recovered |
| Retain | It works and risk outweighs gain | Vendor support is ending |
Incremental migration reduces risk. It does not remove it. Where money moves, a rounding or timing difference matters more than in most systems. A parallel run exposes many differences, not every one, and ledger data migration needs validation your own team signs off.
Whether a change needs a regulator notice or a model-risk review is for your compliance and legal teams.
We work inside your controls, environments and change process, with a mutual NDA before any code or data is shared. We cannot promise timelines, cost savings or outcomes before an assessment, and plans can change after it.
Questions from risk and technology leaders
Can you make our modernization compliant?
Compliance is the bank's obligation, set by its regulators, auditors and policies. We do not certify anything and do not give legal advice. We align engineering work to your controls, document what we change and provide technical evidence your teams can use. Whether the result meets a rule is your decision, made with your advisers.
Can the bank keep running while you modernize?
That is why we work side by side. The old component stays authoritative until the new one has matched it over agreed cycles, and every cutover plan includes rollback points. We do not promise zero downtime, because that depends on batch windows, dependencies and your change calendar, which we learn only by assessing the system.
Will you need production data?
Not necessarily. Many tests run on masked or synthetic data under your data policy. If production-shaped data is needed, it stays in your environment, under your access controls and a mutual NDA. That keeps real customer data out of test environments wherever your policy allows it.
What if the roadmap says do not migrate?
Then we say so in writing. Wrapping a stable core with APIs, or retaining it for now, is often the lower-risk choice. The assessment gives you the reasoning either way, and you can take it to your own team or to another provider.
How does it start, and what does it cost?
Use the request form or WhatsApp. There is no public price list because systems and compliance needs differ. The scope is agreed in writing first, and you approve a quote before any work begins. A legacy code audit is the usual first step.
Describe the system and we will outline how we would assess it
We reply with a few clarifying questions and a proposed scope, and can sign a mutual NDA first. WhatsApp is at +92 326 5200333.
What to send
- What the system does: ledger, payments, cards or loans
- Platform and languages, for example z/OS and COBOL
- Rough size and number of interfaces
- Target environment, if you have chosen one
- Constraints such as freeze periods or audit dates
Chat on WhatsApp
Request a code audit
Please do not send source code, credentials or customer data in chat or in the form.
Talk through your banking system with us
Send the request form or message us on WhatsApp. A mutual NDA can be signed before you share anything.