Modernize Payment Systems Without Breaking What Works
Gateway redesign, ledger architecture, real-time rails, and sponsor-bank integration — done as parallel-run migrations, not big-bang cutovers. For FinTechs whose payment infrastructure is becoming a growth ceiling.
When to call us
Modernization is most useful at specific inflection points. If you recognize yourself below, we can probably help.
Legacy gateway is bottlenecking growth
A patched-together processor stack, brittle ACH/wire flows, or a single-rail dependency is blocking new products and inflating ops cost. Outages compound.
Adding real-time payments
You need to layer FedNow, RTP, or Interac e-Transfer onto an existing stack — without breaking the batch flows that still pay the bills.
Reconciliation is manual
Ops spends days closing each month, breaks are caught late, and your auditors keep flagging the same control gaps. Time to redesign the ledger.
Sponsor-bank migration
Switching sponsor banks, adding a second one for redundancy, or moving from a BaaS to direct relationships. Migration risk is high if planned wrong.
What you actually get
Outcomes, not capabilities. These are what usually move within the first 60–90 days of a modernization engagement.
- Payment gateway redesign with multi-rail support (ACH, wire, FedNow/RTP, card networks, Interac)
- Double-entry ledger architecture with proper accounting controls and audit trail
- Reconciliation pipeline — automated daily breaks detection, exception workflows, finance team self-service
- Sponsor-bank integration: API flows, settlement, reserve management, contractual SLAs
- Fraud and AML controls integrated at transaction time — not a separate after-the-fact pipeline
- Migration plan with parallel-run safety, kill-switches, and a clear rollback path
Named proof
Engagements where we shipped against real payment-system constraints.
Netspend
Austin, TXShipped a credit-building feature on a mobile banking platform end-to-end in 3.5 months. Zero post-launch criticals on a high-volume payments stack.
HelloHive
New York, NYModernized legacy monolith into TypeScript microservices and serverless infra. Cut cloud cost 70%, scaled engineering to 5.
How we work
30-min discovery call
We discuss the current stack, the acute pain, and the constraints (budget, timeline, regulator). Honest read on whether a modernization is the right move.
Architecture assessment
2–3 weeks. Code review, vendor audit, ledger and reconciliation analysis. Output: written architecture document with prioritized risks and a concrete sequencing plan.
Embedded execution
We embed alongside your team — pairing on the highest-risk migrations, owning the cutover plan, and helping recruit the senior payment engineers you will need beyond the engagement.
Frequently asked
How long does a payment systems modernization take?
It depends on scope. A gateway swap with parallel run is usually 4–6 months end-to-end. A ledger redesign tends to be 6–12 months. We sequence the work so something tangible ships every 6–8 weeks rather than a single big-bang cutover.
Do you have preferred gateways or sponsor banks?
No. The right call depends on your product, volume, geography, and risk profile. We help evaluate options (Stripe, Adyen, Worldpay, direct sponsor relationships) against your specific constraints rather than recommending a default.
Can you migrate without taking the system down?
Yes — that is usually the point. We set up parallel-run infrastructure where the old and new systems both process transactions for a period, with reconciliation between them, until confidence is high enough to cut over. Done right, customers never notice.
How do you handle fraud and AML during a migration?
Fraud and AML rules ride alongside the transaction flow — they are not a separate downstream pipeline. We make sure the new stack carries every existing rule before cutover, plus instrumentation to compare detection rates between old and new during parallel run.
Do you write code or just advise?
Both. We will pair with your senior engineers on the highest-risk components, write reference implementations for the patterns we want propagated, and review code on the rest. We are not a deck-and-recommendations shop.
Ready to talk?
30 minutes, free, no pitch. We will tell you honestly whether modernization is the right move.