Full-Time
Senior Data Science/ML Engineer
Financial Crime
SumUp
1,001-5,000 employees
SMB-focused card payment processing hardware
No salary listed
Berlin, Germany
In Person
 AI & Machine Learning (1) |
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 Data & Analytics (1) |
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- Production Python engineering: you write code that ships — you're comfortable with CI/CD, automated testing, versioning, and monitoring in a real production environment
- End-to-end ML pipeline experience: demonstrated experience deploying and operating ML models in production, including drift monitoring and rollback
- Modelling and productionalizing models: demonstrated experience training ML models, choosing appropriate KPIs and metrics for evaluation
- Data engineering fundamentals: hands-on experience with complex, multi-source data ecosystems, data quality, and lineage
- Clear, confident communication: ability to align cross-functional stakeholders, set expectations, and turn ambiguous compliance requirements into a concrete technical plan
- Build and ship production ML systems end to end: own and evolve end-to-end batch training pipelines, model versioning, monitoring, model deployment, and rollback for transaction monitoring models.
- Build, maintain, and improve ML models for transaction monitoring, focusing on detection quality, operational efficiency, and regulatory compliance
- Engineer features mapped to AML and Fraud typologies and suspicious behaviours, working closely with Risk investigators to translate domain knowledge into alerting logic and threshold calibration
- Run sensitivity tests on synthetic datasets, produce ML governance artefacts such as model cards, and deliver audit-ready documentation to meet regulatory expectations
- Own and evolve the AML Risk Score by analysing driver contributions, monitoring drift, running back-testing, and recommending improvements to features, logic, and thresholds
- Partner with AML and Fraud Operations, Product, and Engineering to translate stakeholder needs into actionable, scalable data science solutions
- Track and improve detection performance metrics, adapt solutions to regional compliance requirements, and contribute to system design documentation
- Experience with Pyspark
- Experience in AML, fraud detection, or financial crime domains
- Unsupervised machine learning (e.g. anomaly detection, clustering)
- Familiarity with Feature Stores and alerting threshold calibration
- Experience producing regulatory ML governance artefacts (model cards, audit documentation)
- Experience with AI systems and tooling
SumUp provides card payment solutions for small and medium-sized businesses by selling portable card readers and handling the processing of credit and debit card payments. Its hardware plugs into( or connects to) mobile devices, enabling businesses to accept in-person card payments anywhere. Payments are processed through SumUp’s system with a flat 2.75% fee per in-person transaction, and there are no monthly costs or long-term contracts, making pricing simple and predictable. The company differentiates itself with transparent pricing, no contracts, and a globally available service across markets including the US, UK, Germany, France, and other regions, pairing affordable hardware with straightforward processing. SumUp’s goal is to help SMBs grow by giving them a secure, easy-to-use, and affordable way to take card payments anywhere.
Company Size
1,001-5,000
Company Stage
Debt Financing
Total Funding
$4B
Headquarters
London, United Kingdom
Founded
2012
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See people who can refer or advise you
Simplify's Take
What believers are saying
- June 16, 2026 Canada launch opened SumUp's 38th market with Go reader and Payment Links.
- Upvest rollout lets merchants deploy idle balances into euro money market funds starting at €1.
- Sage's March 2026 MTD product captures cash transactions, addressing UK sole-trader compliance pain.
What critics are saying
- Financial Ombudsman DRN-5599012 shows SumUp refunded transactions after intrusive customer-verification demands.
- May 2024 private-credit financing added $1.62 billion debt, increasing refinancing pressure if growth stalls.
- Payments, banking, investing, and tax create a wider compliance surface; one AML failure destroys trust.
What makes SumUp unique
- SumUp serves 4 million merchants across 38 markets, spanning payments, POS, banking.
- March 24, 2026 Upvest partnership adds in-app investing inside SumUp's merchant app.
- March 10, 2026 Sage integration embeds accounting and MTD tax filing directly into workflows.
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Benefits
Health Insurance
Life Insurance
401(k) Retirement Plan
Gym Membership
Conference Attendance Budget
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Growth & Insights and Company News
6 month growth
↑ 0%1 year growth
↓ -2%2 year growth
↓ -2%Are online booking payments safe? How barbify protects your clients' cards. Taking a deposit or booking fee online is one of the best ways to cut no-shows - but it raises a fair question for any barber: is it actually safe to handle your clients' card details? The short answer is yes, and the reason is that Barbify is built so that card numbers never pass through Barbify at all. This guide explains, in plain terms, exactly where your clients' card data goes when they pay, who is responsible for keeping it secure, and what that means for you and your shop. The short answer: card details never touch barbify. When a client pays a deposit or booking fee through your Barbify page, they aren't typing their card number into Barbify. At the payment step, they're handed off to a secure checkout page hosted by the payment provider itself - Stripe, SumUp or Dojo - where the card is entered. That detail matters more than anything else on this page. Barbify never sees, handles or stores a card number, expiry date or CVC. Barbify couldn't show them to you even if you asked. The only thing that comes back to Barbify is a confirmation that the payment succeeded, so Barbify can mark the booking as paid and send the confirmation. Where your client's card data actually goes. Here's the full journey of a card deposit on Barbify, start to finish: * Your client picks a time and confirms the booking on your Barbify page. * At the payment step, they're redirected to a secure checkout page hosted by Stripe, SumUp or Dojo - not by Barbify. * They enter their card details directly on that provider's page, over an encrypted (HTTPS) connection. * The provider processes the payment and sends the money to your account. * The provider tells Barbify only that the payment succeeded - never the card details - so Barbify confirm the booking. Who handles the security? PCI-Certified processors. The companies that do touch card data - Stripe, SumUp and Dojo - are certified to PCI DSS Level 1, the highest level of the card industry's security standard. It's the same standard banks and major retailers are held to, and it's independently audited every year. By handing the card step entirely to those providers, Barbify keeps your clients' most sensitive data inside systems built and audited specifically to protect it. This is the same approach used by countless online businesses you already trust - the payment page is run by the specialist, not the app. What barbify stores - and what it doesn't. It's worth being precise about what data actually lives in Barbify, because 'we take payments' is often misread as 'we hold card numbers'. Barbify don't. * Stored in Barbify: the client's name, email and phone, their booking details, and a reference code for the payment (so Barbify can look it up with the provider). * Never stored in Barbify: card numbers, expiry dates, CVC codes, or any full payment credentials. * Your own payment keys (your Stripe, SumUp or Dojo connection) are encrypted at rest, so even inside Barbify they're never held in plain text. What this means for you as the barber. Because the card step is fully outsourced to a certified provider and never lands on Barbify, the heavy compliance burden that scares people off taking online payments simply doesn't fall on you the way it would if you were building a checkout yourself. Stripe classifies businesses using this kind of hosted, redirect-based checkout in the simplest possible compliance category - and in Barbify's case has confirmed there's nothing to manually submit. You connect your account, switch on deposits, and the security is handled by the same infrastructure that powers millions of online businesses. Your job is to cut hair; the payment plumbing is designed so you don't have to think about it. A quick note on trust and your clients. When your client is redirected to Stripe, SumUp or Dojo to pay, they may briefly see that provider's name in the address bar or checkout page. That's a good thing, not a red flag - it's the sign that a recognised, secure processor is handling the transaction, exactly as it should. If a client ever asks whether paying a deposit online is safe, you can tell them honestly: their card details go straight to a bank-grade payment provider and are never stored by the booking system. The bottom line. Taking deposits and booking fees online is safe on Barbify because of a single design decision: card details never pass through Barbify. They go straight to Stripe, SumUp or Dojo - PCI DSS Level 1 certified providers - and the money lands in your own account, with 0% Barbify commission. You get fewer no-shows and a more professional booking experience, without taking on the risk of handling card data yourself. You can try it free for 21 days with no credit card required, at barbify.ie/register. Frequently asked questions. Does Barbify store my clients' card details? No. Barbify never sees or stores card numbers, expiry dates or CVC codes. When a client pays, they're redirected to a secure checkout page hosted by Stripe, SumUp or Dojo, where the card is entered. Barbify only receives confirmation that the payment succeeded. Is it safe to take card deposits through Barbify? Yes. The card step is handled entirely by PCI DSS Level 1 certified providers - Stripe, SumUp or Dojo - the same security standard banks are held to. Card data goes straight to the provider over an encrypted connection and never touches Barbify's servers. Who processes the actual payment? Your own connected Stripe, SumUp or Dojo account processes every payment, and the money settles directly to your bank. Barbify is never in the middle of the transaction and takes 0% commission. Is Barbify PCI compliant? Barbify is built so that card data never passes through it, which places it in the simplest PCI compliance category (SAQ A) - the card entry is fully handled by certified processors like Stripe. The processors themselves are independently certified to PCI DSS Level 1, the highest tier of the standard. What happens to my payment provider keys inside Barbify? Your Stripe, SumUp or Dojo connection keys are encrypted at rest inside Barbify, so they're never stored in plain text. Only one provider is connected at a time, and you can switch or remove it whenever you like from your dashboard. Book your next haircut on Barbify. Find top-rated barbers in your city. Book online in seconds - no calls needed.
SumUp, a small business payments fintech, has launched personal banking accounts as it expands beyond merchant services towards a "complete financial ecosystem" serving both businesses and consumers. The move represents a strategic shift for the company, which has traditionally focused on providing payment processing solutions for small businesses. By adding consumer accounts, SumUp aims to create a two-sided platform connecting merchants and their customers. Details about the consumer account features and any incentives for shopping at small businesses were not immediately available.
In brief: SumUp arrives in Canada. Specialist in the acceptance of payments and deployment of cashing offers, UK FinTech SumUp has just announced the extension of its services in a new market: the Canada. This positioning allows it to conquer its 38th market while its services were already deployed to more than 4 million traders in 37 countries. After Mexico in 2025, SumUp opened up to the Canadian market today. SumUp is launching its services in Canada to provide small businesses with simple, mobile and affordable payment solutions in a growing payment market. The size of Canada's payments market is expected to increase from US$1.43 billion in 2025 to US$1.66 billion in 2026 and even reach US$3.47 billion by 2031, according to a Mordor Intelligence report. A market with high potential According tosmall businesses at ISED 2025Canada also has 11 million enterprisesof which 98.2% are small enterprises. SumUp is launching two products in the Canadian market, the portable card reader SumUp Go and a solution of payments by link, simplifying receipts for small traders. Traduit automatiquement via Libretranslate / Automatically translated via Libretranslate
Why are SumUp and Upvest backing embedded investing? March 25, 2026 SumUp is partnering with Upvest to let merchants invest idle cash via in-app money market funds, turning everyday banking into an investment platform Global fintech SumUp has shared a new integrated investment feature that lets small businesses earn on their idle deposits - showing just how its platform has grown from payments to full-spectrum financial management. The company is partnering with Berlin-based Upvest to deliver the service through an API-first model, enabling SumUp's four million merchants to invest directly in euro-denominated money market funds starting with as little as €1 (US$1.16). Initially launching in Germany this month, the functionality will roll out across Europe and the UK in the coming months. The goal, SumUp says, is to give merchants an accessible way to grow surplus cash without complexity or exposure to high-risk investments. Embedded wealth management to support small businesses. By adding investment options to its existing business banking suite, SumUp is blurring traditional boundaries between payments, banking and investment. The move reflects a broader trend in embedded finance - empowering SMEs to manage all financial operations within one digital platform. The new investing feature sits natively within the SumUp app, where merchants already manage day-to-day transactions, card payments and cash advances. Users can now allocate part of their available balance into money market funds - low-risk instruments designed to preserve capital and provide liquidity - without leaving the platform. Behind the scenes, Upvest's investment API powers the full stack of infrastructure, from order execution and custody to regulatory reporting and tax processing. "Small businesses are under constant pressure to set money aside for a rainy day. Yet too often this money sits idle in deposits, when it could be earning interest through investments," says Felix Lamouroux, SVP Global Banking at SumUp. "That's why Fintech Magazine is thrilled to be partnering with Upvest to help build investing into the everyday banking experience for small business owners. "By bringing simple, low-risk investment options onto the SumUp platform, merchants can build wealth on their existing deposits all within a trusted, familiar environment." This emphasises how, for SumUp, the partnership is rooted in a clear mission: to help small businesses build financial resilience and grow wealth over time. The approach not only modernises SumUp's banking ecosystem but also gives SMEs access to opportunities that were once exclusive to larger corporations or specialist financial institutions. Ensuring innovation is infrastructure-first. Upvest's involvement further drives home how API-driven investment infrastructure is transforming capital markets access. Its platform handles the operational and regulatory complexities - execution, settlement, custody and compliance - behind the scenes, freeing partners like SumUp to focus on user experience. Martin Kassing, Co-Founder and CEO of Upvest, says: "Fintech Magazine is proud to be working with SumUp to seamlessly integrate investing capabilities into everyday business banking. "Powered by Upvest's Investment API, SumUp can now offer a best-in-class investment proposition for merchants to grow their wealth. "This partnership shows how modern investment infrastructure can make capital markets investing accessible and operationally simple at scale." Upvest already powers investment features for several high-growth fintechs, including Revolut, N26, Webull and Raisin. Its collaboration with SumUp shows how the company's infrastructure model can extend beyond consumer finance and into the realm of small business banking. Company portals.
SumUp partners with Upvest to launch in-app investing, enabling merchants to grow their cash with money market funds. WHY THIS MATTERS SumUp's move into in-app investing reflects a broader convergence between payments, banking and wealth management - particularly for SMEs. Small businesses often hold idle cash for liquidity, but traditional banking rarely offers meaningful returns without added complexity. By embedding access to money market funds directly into its app, SumUp is turning business accounts into yield-generating tools without requiring merchants to leave the platform. Global fintech SumUp today announces the launch of a new in-app investing feature, giving merchants a simple and accessible way to grow their business funds directly within the SumUp app. By partnering with Europe's leading investment infrastructure provider Upvest, SumUp can now offer merchants a simple and accessible way to build wealth on the SumUp platform. Starting in Germany in March, with a wider European and UK rollout to follow, merchants can now allocate their balance into highly competitive, euro-denominated money market funds. With fractional investing, merchants can earn interest and make more of their money. Money market funds invest in short-term, high-quality debt instruments and are designed to preserve capital and provide liquidity. By integrating this investment option into its business banking offering, SumUp gives merchants a straightforward way to potentially earn returns on surplus cash, without complex processes or additional providers. The new investing feature is seamlessly embedded into the SumUp ecosystem, allowing merchants to manage payments, banking and investments all in one place. Behind the scenes, Upvest's investment infrastructure handles order execution and settlement, custody, regulatory reporting and tax processing, thus reducing operational complexity and enabling SumUp to focus on delivering a digital-first and cost-efficient experience. With this launch, SumUp continues to expand its financial services ecosystem, helping merchants not only run their businesses, but grow them. Felix Lamouroux, SVP Global Banking at SumUp said: Small businesses are under constant pressure to set money aside for a rainy day. Yet too often this money sits idle in deposits, when it could be earning interest through investments. That's why we're thrilled to be partnering with Upvest to help build investing into the everyday banking experience for small business owners. By bringing simple, low-risk investment options onto the SumUp platform, merchants can build wealth on their existing deposits all within a trusted, familiar environment. Martin Kassing, CEO and co-founder of Upvest said: We are proud to be working with SumUp to seamlessly integrate investing capabilities into everyday business banking. Powered by Upvest's Investment API, SumUp can now offer a best-in-class investment proposition for merchants to grow their wealth. This partnership shows how modern investment infrastructure can make capital markets investing accessible and operationally simple at scale. FF NEWS TAKE Fintech is no longer just about moving money - it's about making money work harder. SumUp's latest launch shows how platforms are evolving into full financial ecosystems for SMEs. By embedding investing into everyday business banking, fintechs are blurring the line between cash management and wealth creation. Expect more players to follow, as the race shifts from offering services to owning the entire financial lifecycle of small businesses.