Former Mollie and Klarna executives launch Biller, an AI powered solution for buy now, pay later B2B purchasing

Biller team co-builds its company with European AI B2B venture studio Slimmer AI

Amsterdam, The Netherlands – 27 July 2021

Former Mollie and Klarna senior managers have developed Biller, an AI powered buy now, pay later invoicing solution to solve the problems of B2B purchasing. The product helps commerce leaders reduce risk, optimise cash flow and exceed buyers’ needs and expectations. The Biller team is co-building its company with Slimmer AI, a European AI B2B venture studio that recently spun-out regtech startup Sentinels. 

The B2B commerce market is changing rapidly and according to Goldman Sachs B2B is the next untapped market opportunity for the payments industry. In Europe, online B2B commerce volume was 710 billion and growing at 18% CAGR. 

Derek Vreeburg, co-founder and CEO of Biller explains why he is excited to launch Biller, “Current B2B invoice solutions have lacked innovation for years. With our experience at Klarna and Mollie we know how to transform complex processes into easy-to-use services. Combined with the AI expertise of Slimmer AI, we are confident that we can challenge the status quo and contribute to the next chapter in online B2B commerce”

Future proofing B2B invoicing

B2B commerce has grown rapidly, and sellers are struggling to keep up with and adapt to buyers’ expectations and needs. Traditional suppliers can neither provide an intuitive product for the desired check-out experience nor add flexibility to the invoice process. 

Biller was founded to take away the challenges both buyers and sellers experience trying to fit traditional processes into an increasingly digital world. Realtime, AI powered credit and fraud checks, flexible payment terms, personalised debtor management and guaranteed payouts are all areas needed to future proof B2B invoicing and provide an improved experience for both sellers and buyers.

JC Heyneke, CEO Slimmer AI, “We are convinced that machine learning will reshape the way credit risk assessment in B2B is done, and that this is needed to evolve B2B ecommerce. We are thrilled to partner with Derek, Mick, and Uwe to build Biller!”

About Biller

Biller. is an Amsterdam-based company focusing on buy-now, pay-later B2B purchasing. The AI-driven Biller solution is a payment method that meets buyer expectations while reducing the risk and operational burden for the seller. The Biller founding team of Derek Vreeburg, Uwe van Rensburg and Mick Gromotka brings together over 30 years of experience in the e-commerce and payment industry serving at companies like Klarna, Mollie, Yolt and Rocket Internet. For more information go to

About Slimmer AI

Slimmer AI is a European AI B2B venture studio. We believe in the power of AI to power people’s work. We build and support new B2B software ventures that applies AI to disrupt industries. For 10+ years, Slimmer AI has led the way in applying machine learning to solve real-world problems, partnering with entrepreneurs and industry leaders to build innovative applied AI products and ventures. For more information go to Slimmer AI.

About Biller

Biller is the B2B Buy Now, Pay Later payment method that simplifies online sales and purchases.

With Biller, business buyers can delay paying for their purchases – up to 90 days – with no risk to the sellers. They get paid in full in as quickly as seven days, regardless of when customers choose to pay. Plus, the checkout’s a breeze with all necessary credit checks made in a matter of seconds thanks to Biller’s use of AI.

Biller is part of the Banking Circle Group – an industry leader that currently processes 6% of European e-commerce payments in the global banking and payments space – with customers like Shopify, Stripe and Alibaba

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