How to choose a software development partner for financial services

How to choose a software development partner for financial services

Every industry claims to be special, but financial services has the paperwork to prove it. A retailer that ships a bad feature loses some sales. A bank that ships one can misstate positions, break a settlement chain, or spend the next quarter explaining itself to a regulator. That difference should change how you buy software engineering, yet most firms still evaluate development partners with the same generic checklist as everyone else: rates, CVs, a case study or two.

This guide covers what actually separates a software development partner that can work in finance from one that can merely code, and the questions that expose the difference before you sign.

Why generalist outsourcing struggles in finance

Financial systems are unusual in three ways that catch generalist teams out.

The domain has its own language. Order lifecycles, settlement windows, reconciliation breaks, corporate actions: a team that has never lived with these concepts will build something that compiles but misunderstands the business. You pay for that education in rework, and you pay for it during your project, not before it.

The non-functional requirements dominate. In most software, performance and auditability are polish. In trading and payments they are the product. A pricing service that is correct but slow is wrong. A transaction store that cannot explain its own history is a liability. Teams who have only built content sites and CRUD apps tend to discover this at load-testing time, which is the most expensive possible moment.

Regulation shapes the architecture. Operational resilience rules in the UK and DORA in the EU expect firms to know exactly which third parties sit inside critical services, how they fail, and how quickly they recover. Your development partner is part of your answer to that question. A partner who has never been inside a regulated delivery will not know what evidence you need from them, and you will find yourself teaching your supplier how to be audited.

Six things to look for

1. Pedigree in environments like yours

Ask where their engineers and, more importantly, their engineering leaders earned their habits. Time inside tier-one banks, investment managers or exchanges shows up in the questions a team asks in week one: about reference data, about cut-off times, about who consumes the numbers downstream. Teams without that background do not know which questions exist.

2. Engineering standards as habits, not documents

Every agency has a quality page. Fewer can show you code review records, automated test coverage on a real delivery, and a CI/CD pipeline they set up themselves. In finance the gap between claimed and practised standards is the gap between passing and failing your own change-management audit.

3. Involvement in open standards

The serious end of financial software has organised itself around open standards bodies such as FINOS, the fintech open source foundation. A partner that contributes there is voluntarily doing engineering in public, where sloppy work would be visible. It is one of the few quality signals that cannot be written by a marketing team.

4. A security posture you can inspect

Data handling, access control, environment separation and vetting should be answerable in specifics: who can see production data, from which country, under what agreement. "We take security seriously" is not an answer; a named process is.

5. Team continuity and named leadership

Domain knowledge accumulates in people. If your partner rotates engineers every few months, you are perpetually paying the education cost from the first section. Ask for attrition numbers and for a named engineering lead who owns your delivery end to end, and who you can call when something goes wrong.

6. Range from prototype to production

Many firms want a partner who can move fast on an MVP and then harden it to enterprise grade without a handover to a different company. Those are different muscles. Ask for an example of the same team doing both.

Red flags worth taking seriously

• The CV carousel. You are sold senior profiles and staffed with whoever was free. Ask whether the people in the proposal are the people on the team.
• "We can start forty people on Monday." Nobody benches forty good engineers. Either the bench is not good, or it will be assembled from strangers on Sunday.
• Demo-grade delivery. Impressive prototypes with no tests, no pipeline and no story for support. Fine for a hackathon, expensive in a bank.
• No questions about your regulatory context. A partner who has worked in finance will ask about your compliance obligations early, because those obligations become theirs. Silence on the subject means they do not know to ask.

Questions for the shortlist

• Which regulated environments have your current engineering leaders shipped into, and what did they build?
• What evidence can you provide for our operational resilience and outsourcing assessments?
• What is your engineer retention rate over the past two years?
• Show us a delivery that went wrong. What happened, and what did the client see?
• Who, by name, owns our delivery, and how much of their time do we get?

The last two matter most. Every partner has a failure story; the honest ones tell it well. And accountability that is not attached to a person is not accountability.

Where Turntabl fits

Turntabl builds engineering teams for tier-one financial services, investment management, payments and retail banking. Our training was designed by people who built low-latency trading systems, we contribute to FINOS, and our engineers in Accra work the same hours as London. We hold ourselves to the checklist above and are comfortable being examined against it. If you are drawing up a shortlist, we would like to be on it.