How lenders should decide what to build and buy for LAS

50Fin
October 27, 2026

In the age of AI, programming capabilities seem to be normalized across the board. Hence, most enterprises often dabble with the idea of building technology and software to run key platforms that help operationalize products such as loans against securities such as equities and mutual funds, etc. In this blog, we discuss how to make sense of the decision. 

The build-or-buy decision in Loan Against Securities should begin with the responsibilities a lender needs to retain, the capabilities it can source, and the evidence required to operate both together. A useful assessment compares the full life of the loan book, including policy changes, exceptions and servicing, rather than only the cost of launching an application journey.

There are credible reasons to build lending technology internally. An institution may have unusual policy requirements, strong engineering capabilities or existing systems that already perform much of the necessary work. Buying can also be sensible when a specialist platform offers relevant workflows and reduces the amount of infrastructure the lender needs to create and maintain.

Neither choice removes the need to define how the product will run. A lender can own the code and still have unclear operational responsibilities. It can use a vendor and retain firm control over the decisions that matter.

The evaluation becomes more useful when it moves from a single procurement label to specific capabilities and accountabilities.

Separate credit decisions from their execution

Begin by documenting the decisions that express the lender's proposition and risk appetite. These can include eligible customer segments, acceptable securities, advance ratios, exposure limits, pricing and the treatment of exceptions.

Then describe how each decision becomes an operating rule. Who proposes a change? Who reviews it? When does it take effect? What evidence shows that the system applied the intended version?

Those questions apply whether the software is internally developed or purchased. An institution needs enough understanding of the implementation to verify that its chosen policy is being executed correctly.

This creates a useful distinction in the assessment. Owning a credit decision does not require writing every component that carries it out. Conversely, buying a configurable component does not establish that the lender can safely change its configuration.

A proof of concept should test the complete path from a policy decision to its effect on a representative account. That is more informative than a demonstration that a field can be edited.

Map the capabilities around a live facility

A borrower applying for a facility interacts with identity checks, portfolio discovery, eligibility assessment, documentation and collateral creation. After disbursal, the lender needs to manage changes in collateral, exposure and customer requests.

The operating model can therefore be divided into capabilities such as origination, collateral management, risk calculation, servicing coordination and reporting. The boundaries will vary by institution. Some responsibilities may already sit in the lender's core or loan management system.

50Fin's public product material distinguishes its Loan Origination System, Collateral Management System and Risk Management System. Those categories provide a starting vocabulary for evaluating coverage. They do not, on their own, establish the architecture of a particular implementation.

The lender should map the responsibilities that cross those boundaries. Pledge initiation may be part of the origination journey, while subsequent collateral actions belong to ongoing operations. A loan balance may be maintained in one system and consumed by another when assessing a release request.

Without an explicit map, two components can each appear complete while the handoff between them remains undefined.

Use one customer request to expose the dependencies

Consider a customer who makes a part repayment and requests the release of some pledged securities. It is an ordinary scenario with several useful evaluation questions.

Which system confirms the payment? Which balance is used in the release assessment? Where are the current holdings and applicable collateral rules recorded? Who approves the action, and which confirmation establishes that the securities have been released?

Now add a delay: the repayment is visible to the customer but has not yet updated the loan record used by the collateral workflow. Ask how the request is held, investigated and explained.

The exercise should produce a clear allocation of responsibility. A system may own a financial record, execute a workflow or display a status. Those roles should be deliberately assigned. They should also remain understandable to the teams who will support the customer.

This scenario works for both an internal build and a vendor evaluation. It tests the proposed system against a business outcome rather than against a list of isolated features.

Compare the cost of operating and changing the system

Initial development effort and licence fees are visible costs. A fuller comparison includes integration maintenance, testing, operational support, data reconciliation and the work required to implement future changes.

For an internal build, ask who maintains each external connection, investigates a failed workflow and updates the software when the operating requirements change. The budget should recognise continuing ownership by engineering and business teams.

For a purchased platform, ask how configuration changes are handled, what requires custom development, how issues are escalated and what evidence the lender can access. Commercial terms should be evaluated alongside these responsibilities.

Useful comparisons can be made through a small set of representative changes: adding an eligible security type, changing an exposure rule, revising an approval process or updating an integration. Estimate the people, dependencies and testing each option would require.

This does not justify assuming that every internal build will become expensive or every vendor will accelerate delivery. The outcome depends on the institution's existing capabilities and the fit of the proposed solution. The comparison should make those assumptions visible.

Give the internal build its strongest case

Building may be the right choice where the required capability is central to differentiation and the lender has the capacity to maintain it. It may also be attractive where a mature internal platform already handles most of the workflow and a purchased solution would duplicate that work.

Control over the development sequence can matter. Teams can prioritise changes around their own product strategy, subject to their actual engineering capacity. Deep familiarity with internal systems can also reduce some integration uncertainty.

The relevant challenge is to demonstrate sustained ownership. A successful launch needs people who will continue to understand and support the system as the book grows, requirements evolve and individual team members change roles.

An internal proposal should therefore identify the long-term service owner, the support model and the tests used to verify critical financial and collateral decisions. Those are operating commitments, not administrative details.

Give the purchased platform its strongest case

A specialist platform may offer workflows the lender would otherwise have to design, implement and maintain. It can be particularly relevant where the institution needs collateral-specific capabilities alongside an existing core environment.

The value depends on fit. Buyers should distinguish demonstrated standard capability, lender-specific configuration and development that has yet to be completed. A roadmap item should be evaluated as future work, with its dependencies and delivery uncertainty made explicit.

The vendor's operating model also matters. Can the lender trace a decision, obtain the data it needs, investigate an incident and understand the status of unresolved work? How will changes be tested before they affect accounts?

These questions help the institution assess how much control it can exercise in practice. A feature-rich platform may still be unsuitable if the lender cannot obtain the evidence required to run its own process.

Make the decision capability by capability

The final choice may combine internal and external components. That can be a sensible design when each boundary is understood. It can also create additional coordination work, which belongs in the comparison.

For each capability, record the accountable business owner, the system responsible for execution, the authoritative data sources and the procedure for resolving a failed handoff. Then validate the proposed arrangement with representative accounts and exceptions.

The decision should leave the institution able to answer a practical question: when a customer request becomes stuck between systems, who knows what happened and who has the means to resolve it?

A defensible LAS architecture gives that question a clear answer before the loan book depends on it.

To assess the fit of specialist infrastructure, explore 50Fin's solutions for lenders against your institution's own operating requirements.

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