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Banking and fintech platforms.

A double-entry ledger that reconciles against the partner bank holding the funds, with every movement recorded and referenced. Accounts, card and payment integrations, compliance cases, and back-office tools come with the controls partner due diligence asks about.

Illustration of a fintech platform built by Baybloom: a banking partner, a card processor, and a compliance provider connected to the company’s own ledger, with exceptions waiting for review.

Who this is for

Founders and product leaders at fintech companies and financial businesses building a product: an account or wallet, an embedded payments feature, a lending or savings product, a treasury or expense tool. Licensed partners hold the funds and the licenses; the platform we build is the product, the ledger, the integrations, and the operations.

What makes it urgent

  • A partner bank or processor has been chosen and the product has to be built on it.
  • The prototype has customers and no ledger anyone would audit.
  • Compliance and back-office work is being done in spreadsheets around the product.

What usually breaks

  • Balances are computed from the partner’s API rather than kept in a ledger.
  • Reconciliation with the partner is manual.
  • Compliance cases and customer operations run outside the product.

The workflow

Before and after the first release.

The steps we see most often in this kind of operation.

Today
  1. AccountA record in the partner’s system only
  2. MovementCalled through the API; not recorded
  3. ReconcileA monthly spreadsheet
  4. OpsSupport and compliance in email
With the first release
  1. AccountYour product’s account and ledger model, linked to the partner bank
  2. MovementEvery movement recorded, double-entry, with the partner reference
  3. ReconcileAutomatic against partner statements; differences listed
  4. OpsBack-office tools for support, compliance, and finance

Features

What the system can include.

Customer onboarding flows

Sign-up with identity verification and screening through licensed providers, with applications that need review routed to your operations team.

Transaction history and statements

Customers see pending and settled movements with clear descriptions, and statements are generated from the ledger rather than the partner’s raw data.

Money movement orchestration

Transfers, card settlements, and payouts coordinated through partner APIs, with each step recorded so failures and reversals are handled cleanly.

Limits and controls engine

Limits by customer and product on balances, transfers, and spending, enforced before instructions reach the partner and adjustable by authorized staff.

Fee and interest calculation

Fees, interest, and rewards computed from the ledger by rule and posted as entries, so every charge a customer sees can be explained.

Treasury and funding views

Finance sees balances held at each partner, expected settlements, and funding needs, drawn from the ledger and reconciled partner statements.

Your first release

What the first release could include.

In the first release

  • Account and ledger model, double-entry, with every movement recorded
  • Integration with one banking or payment partner for one money-movement flow
  • Automatic reconciliation against the partner, with differences listed
  • Back-office tools for customer operations and compliance cases
  • Audit trail, access control, and data handling agreed in writing

Usually later

  • Card program and additional partner integrations
  • Customer-facing app or web product on the same ledger
  • Reporting for partners, auditors, and regulators

Systems it may connect

  • Banking-as-a-service and payment partners
  • Card issuers and processors
  • KYC, AML screening, and fraud providers
  • Accounting and treasury tools
  • Identity providers and secure messaging
  • Data warehouse and reporting

How the work runs

Scoped in writing, built in releases, handed over to your team.

Scope

We start with the people doing the work and the systems around it, then write down the first release: what it includes, what it leaves for later, the integration decisions, and the acceptance criteria. Nothing is built until that scope is agreed.

Build and test

We build in releases you can review as the work takes shape, using realistic data. Every release carries tests, a security review, and documentation. Integrations are tested against real records, with exceptions visible.

Handover

Your team receives the documentation, the runbooks, and the training to run the system, and we stay on for continued engineering when you want it.

Scope and price

What shapes the scope and price.

Every project is priced from a written scope. These are the factors that move it most.

Money movement types

Each flow, whether transfers, card spend, deposits, or payouts, adds ledger entries, states, failure handling, and reconciliation rules to design and test.

Number of partners

One banking partner is simpler than several, where the ledger must track funds across partners and reconcile each against its own statements and formats.

Partner due diligence expectations

The controls, documentation, and operating procedures a partner bank requires shape the first release, and stricter programs add more evidence and review work.

Breadth of the back office

Support, disputes, compliance cases, and finance operations each need tools and permissions, and the range the team needs at launch changes the scope.

Fintech with a partner bank

Operations reads balances from a double-entry ledger that reconciles against the partner bank.

Early fintech products often show balances straight from the partner bank’s API and reconcile in a spreadsheet, which is among the first things a partner’s due diligence asks about. A first release puts a double-entry ledger underneath, with every movement recorded and referenced to the partner, and reconciles it automatically against partner statements with differences listed. Operations gets a back office for customer support and compliance cases, with access control and an audit trail. A card program or a customer app on the same ledger can come next.

Questions

Questions about banking and fintech platforms.

What buyers ask before a project like this starts.

Do you hold licenses or funds?

No. Licensed partners hold the funds and the licenses. We build the product, the ledger, the integrations, and the operations software around them.

Why build a separate ledger?

The partner’s record serves the partner. A double-entry ledger inside your product is what your finance team, your auditors, and your next partner will ask for, and it is what makes reconciliation possible.

Can you meet our partner’s security requirements?

The first release includes the controls partners ask about: access control, audit trails, secrets management, encryption, and documented data handling. Certifications are a separate decision we can prepare you for.

Which partners do you work with?

We work with the partners you have chosen or are evaluating. We integrate through their APIs and recommend from your product’s requirements, not a preference.

Can we switch partner banks later?

The ledger and product are designed so the partner sits behind an integration layer, with the product’s account model independent of any one partner’s data structures. Moving to a new partner or adding a second one is still a project, but it changes the integration rather than the product.

How do customers get support when something goes wrong?

Support staff see the customer, their balances, and every movement with partner references in one back-office view, so questions are answered without calling the partner first. Disputes and complaints become cases with owners and deadlines, and actions that change balances require the right role and are recorded.

Can the platform scale as transaction volume grows?

The ledger is designed for high volumes of entries, with reconciliation and reporting running in the background rather than against live traffic. Load is tested before launch at levels above the forecast, and monitoring shows where capacity needs attention well before customers would notice.

Discuss a fintech build.

Tell us about the workflow and the systems around it.
We’ll come back with a written scope for a first release.