Top Fintech Companies With Engineering Teams in 2026, Plus the Best HR Software

The top fintech companies with engineering teams worth knowing in 2026 include Stripe, Revolut, Wise and Monzo in the US and UK, plus PhonePe and Razorpay in India. What links them is that they build their core products themselves: payments infrastructure, banking apps, money-transfer networks, developer platforms. We picked them using public signals anyone can check, like open-source projects, public developer APIs and products running on their own technology, rather than headcount or hype. A word of warning, though. Many search results for this topic are really lists of outsourcing agencies that build software for other people. If you're job hunting or choosing a partner, check whether a company engineers its own product.

Why "builds its own product" matters

Imagine Arjun, a backend engineer weighing up two offers. One is from a company whose app he uses every day. The other is from an agency that builds apps for whoever's paying this quarter. Both call themselves fintech. Only one will let him work on the same payments system for three years and see what his code does at scale. That's the difference this list is about.

How we chose these companies

Three things. A product built and run by the company's own engineers. Public evidence of that work, such as open-source code or developer APIs. And a track record at real scale. We haven't ranked them or quoted team sizes; reliable public numbers are rare and go stale fast.

Six fintech companies known for in-house engineering

Stripe

Founded around 2010, Stripe runs payments infrastructure and APIs for online businesses, with headquarters in South San Francisco and Dublin. Its engineers built Sorbet, a type checker for Ruby, and then gave it away as open source.

Revolut

Revolut started in London in 2015 and now offers banking, cards and money transfers through its app. Back in 2017 it began building its own payment processing technology rather than leaning entirely on third parties.

Wise

Wise began life in London in 2011 as TransferWise. It moves money across borders, and through Wise Platform, banks and other businesses can plug the same infrastructure into their own products.

Monzo

Monzo, an app-led bank from London, was founded in 2015. It publishes a developer API, so people can tinker with their own account data.

PhonePe

PhonePe, based in Bengaluru, was set up in 2015 and bought by Flipkart in 2016. It's one of India's most widely used UPI apps, and in 2024 it launched Indus Appstore, an Android app store built in India.

Razorpay

Razorpay was founded in Bengaluru by IIT Roorkee alumni. It offers a payment gateway, RazorpayX business banking, and the APIs and SDKs that Indian businesses of every size build on.

What do strong fintech engineering teams have in common?

Their engineers work on the core product, not on gluing other people's tools together. They publish developer documentation and APIs. Many contribute to open source or write openly about how they build things. And they spend heavily on security, compliance and reliability, because in finance an outage isn't just embarrassing; it's someone's rent not arriving.

What's the best HR software for fintech companies?

Now flip it round. If you're the one hiring engineers like Arjun, HR gets busy fast. Hiring rarely pauses, engineers expect regular and fair feedback, hybrid working makes attendance messier, and client projects need proper time records. Security matters more than usual too, because regulators and enterprise customers will ask about it. So when you compare HR software, look closely at recruitment and onboarding, performance reviews, flexible attendance, project timesheets and the vendor's own security credentials.

How OfficePortal supports growing fintech and tech teams

OfficePortal puts talent management, performance management, attendance tracking and timesheets in one HR platform, with AES-256 encryption on SOC 2 compliant infrastructure. See how it works for finance, information technology and SaaS teams who'd rather not outgrow their HR system within a year.

Conclusion: Scale your fintech team with OfficePortal

Hiring fast is hard enough without your HR tools getting in the way. OfficePortal gives a growing fintech one system for hiring and onboarding, structured reviews with 360-degree peer feedback, hybrid attendance and project timesheets. It runs on SOC 2 compliant infrastructure with AES-256 encryption, so you've got a straight answer when a regulator or an enterprise customer asks about security. Start free with OfficePortal for up to five users, compare plans on the pricing page, or book a demo to see how it fits your engineering team.