Northmill Bank is a Swedish neobank founded in 2006, serving around 250 000 customers across Sweden, Norway, Finland, and Denmark with savings, credit, payments, and insurance.
When Joakim Zaar, Growth Marketing Manager, and the team decided to build a referral program, the logic was simple: customers liked the product, so give them a reason to spread the word. But in regulated fintech, nothing stays simple for long.
What needed fixing
- Swedish tax law imposes reward limits per customer, requiring hard guardrails in the referral program.
- Aligning teams, tightening the tech, and preparing the program to work across markets.
- Marketing, engineering, and business all run the same program with real reward fulfilment flowing through it.
The problem with referrals when you're a bank
Most referral tools are built for ecommerce. Add to cart, apply code, get discount – clean and predictable. Northmill's world doesn't work like that.
For starters, the referral trigger needs to mark a custom milestone: card activation, first deposit, or first card purchase. Only then do both sides receive their reward. Then there are the compliance constraints. Swedish tax law imposes annual reward limits per customer, which means the program needs to enforce hard caps automatically, reliably, every time.
And it's not just one person managing this. Marketing owns the messaging through Braze. Engineering owns the integration and event pipeline. The business team runs in-house analysis on referral performance against actual reward distribution. As referrals grew into one of Northmill's most important acquisition channels, the number of people who needed the system to work perfectly grew with it.
"In banking, you can't just move fast and break things. Every reward fulfilment has real compliance implications. The flexibility to set hard guardrails while still iterating on the program is what made this work for us."
Start small, learn fast
Northmill's engineering team could have built referral logic in-house. They had the talent for it. But Joakim saw the math clearly: building a referral engine isn't the hard part, maintaining it is. Tax rules change, reward structures evolve, new markets bring new constraints. Every hour spent on referral infrastructure is an hour not spent on core banking.
So the team picked Voucherify. Joakim signed up and had referrals running within weeks.
The first version was deliberately lean. Voucherify handled the referral logic: compliance cap validation, tracking, and reward rules. Braze served as the CRM, pulling referral codes dynamically into templates through Connected Content. Northmill's own systems handled the milestone event and converted successful referrals into customer incentives.
Sweden was the test. It passed and referrals quickly became one of the key acquisition channels, and the team used what they learned to tighten tracking and cap enforcement. Now the same program, with everything they built in Sweden baked in, is rolling out to Finland.
"Referrals went from an experiment to one of our strongest acquisition channels, and we're just getting started with Finland."
Where Northmill is headed
Joakim and the team aren't standing still. The referral program is expanding to Finland, bringing a second market online with its own regulatory landscape. Beyond geographic expansion, the team is continuing to evolve the incentive model and explore new ways to deepen customer engagement, building on the foundation they've already proven works.
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