ledger systems

Solaris

Solaris is a Berlin-based fintech infrastructure platform that lets financial institutions and fintechs launch their own digital banking products without building tech from scratch. Rather than wrestling with legacy core banking systems, clients plug into Solaris's cloud-native API layer to issue cards, manage accounts, and process payments at speed. The company operates in the shadows of most consumer apps—you won't see the Solaris logo in an app store—but its backbone runs through dozens of European fintechs, neobanks, and traditional financial institutions. Think of it as the plumbing that powers other people's banking ambitions. Solaris dominates a specific niche: the BaaS (Banking-as-a-Service) and embedded finance layer for Europe. While competitors like Thought Machine and Temenos chase enterprise banking overhauls, Solaris stays focused on the modern fintech workflow. Its modular design appeals to companies that need speed and flexibility, not a 10-year implementation project. In a market crowded with infrastructure plays, Solaris has become essential plumbing for European digital banking. It sits at the intersection of regulatory compliance, technical simplicity, and startup ambition—precisely where the next wave of European fintech is being built.

Founded 2015

Mambu

Mambu is a cloud-native banking software platform that lets financial institutions and fintechs launch and operate lending and deposit products without building from scratch. Rather than forcing customers into rigid legacy systems, Mambu provides composable banking infrastructure—modular APIs and pre-built components that work together or stand alone, depending on what you actually need. The company sits at the intersection of two fintech realities: traditional banks are drowning in outdated core systems that can't keep pace with market demands, while new lenders and neobanks need speed without sacrificing compliance or scale. Mambu's approach is to be the operating system underneath, handling the heavy lifting of loan origination, deposit management, portfolio servicing, and regulatory reporting while letting clients focus on customer experience and product innovation. What makes Mambu different from other core banking platforms is its emphasis on velocity. Institutions deploy in weeks rather than years. The platform is genuinely modular—you can pick the lending module, the deposit module, or both, and layer in third-party services through APIs. This flexibility has resonated with everyone from African microfinance networks to European challenger banks to enterprise lenders managing complex credit products. Mambu is now a critical piece of infrastructure in the emerging markets fintech ecosystem, particularly across Africa and Asia, where it powers lending operations for hundreds of financial institutions. In Europe, it's carved out space among mid-market and challenger banks looking to avoid the capital expenditure and technical debt of legacy systems. The company represents a broader shift in fintech: away from end-to-end platforms that claim to do everything, toward specialized infrastructure that does one thing—backend financial operations—exceptionally well.

Founded 2011

Thought Machine

Thought Machine builds the operating system for modern banking. Its Vault platform is a cloud-native core banking system that replaces the legacy infrastructure most banks still depend on—the kind that was written when personal computers were novel and the internet was optional. Rather than patching decades-old mainframes with band-aids, Vault lets banks modernize from the ground up, moving away from monolithic systems toward modular architecture that can actually adapt to change. The platform serves as the nervous system for digital banking, payment processing, and lending at scale, handling everything from transactions to regulatory compliance in real time. Thought Machine competes directly against vendors like Temenos and Finastra, but with a fundamentally different philosophy: born in the cloud, designed for APIs, built for speed. The company works with tier-one banks and ambitious challengers alike, essentially selling them the technical freedom to compete in fintech's pace rather than their legacy system's glacial timeline. In the broader European fintech ecosystem, Thought Machine represents the infrastructure layer that makes everything else possible—without modern core banking, the rest of the fintech revolution stays locked in legacy constraints.

Founded 2014

Tieto

Tieto operates in the murky middle ground between traditional IT services and fintech infrastructure, building the unsexy-but-essential systems that European financial institutions actually run on. The company provides core banking platforms, payment systems, and digital banking solutions to banks and financial services firms across the Nordic and European markets. Where most fintech captures headlines with consumer apps, Tieto stays disciplined in the B2B infrastructure game—modernizing legacy systems, managing complex regulatory requirements, and keeping payments flowing. Its positioning reflects a particular Nordic pragmatism: less about disruption, more about making banking systems reliable, scalable, and compliant. In a landscape crowded with flashy consumer fintechs, Tieto represents the unglamorous but critical plumbing layer that enables everyone else to operate. The company remains one of Europe's largest fintech infrastructure players, though its parent company structure and steady-handed approach means it rarely commands the venture attention of younger competitors.

Founded 1969

Mangopay

Mangopay sits at the intersection of payments infrastructure and marketplace complexity. Rather than selling fintech features individually, the company tackles the full stack problem: how do you actually move money between dozens of parties—buyers, sellers, platforms, creators—when everyone needs different settlement rules and nobody trusts a stranger with their cash. Founded in 2011, Mangopay is a Brussels-based powerhouse that specializes in payout infrastructure for marketplaces, platforms, and creator economies. The platform handles the messy reality of modern commerce: a freelancer in Barcelona getting paid by a client in London, a marketplace taking commission, a payment processor taking a fee, and a tax authority wanting its cut—all simultaneously, all reconciled, all compliant. What sets Mangopay apart is its pragmatism. While most payment processors treat multi-party transactions as an edge case, Mangopay designed around it from the start. The company's white-label approach means you barely know it's there—you integrate their APIs, they handle the regulatory nightmare, and your users see your brand. That's the opposite of fintech theater. The European fintech world has fractured into specialists: payments here, compliance there, ledger systems somewhere else. Mangopay refuses that fragmentation. In a landscape where payment orchestration feels trendy and new, Mangopay has been solving it at scale for over a decade.

Founded 2011

Oradian

Microfinance institutions and banks operating in emerging markets have technology needs that the major core banking platforms haven't traditionally served well — they need cloud-deployed infrastructure that runs reliably with intermittent connectivity, supports the specific products and workflows of microfinance, and is priced for institutions that operate at scale but with thinner margins than developed-market banks. Oradian was founded in Zagreb in 2012 to build that core banking platform, deploying its cloud-native banking infrastructure to microfinance institutions, credit unions, and emerging market banks across Africa, Southeast Asia, and Latin America. The Croatian engineering base combined with deep expertise in emerging market banking operations gave Oradian a positioning that few core banking competitors could replicate — modern cloud architecture combined with genuine understanding of how microfinance institutions actually work. Oradian has deployed its platform to hundreds of financial institutions across multiple emerging market regions, processing billions in transactions for institutions serving millions of customers who would otherwise be excluded from formal financial services. In the broader European fintech landscape, Oradian represents the category of European technology built explicitly for emerging market deployment — a model that has produced some of the more interesting and impactful fintech outcomes by addressing markets where the underlying need is substantial and where European technology engineering can deliver disproportionate value.

Founded 2012

RS2

RS2 sits at the infrastructure layer of European fintech, operating as a silent but essential backbone for digital banking. The company builds payment and banking systems that power everything from challenger banks to traditional financial institutions, handling the plumbing that most customers never see but every modern bank needs. Rather than competing for end-user attention, RS2 focuses on solving the unglamorous but critical problem: how do you move money, verify identities, and manage accounts at scale across multiple countries and currencies. Their platform approach means banks and fintechs can launch new services faster without rebuilding core systems from scratch. In a landscape crowded with consumer-facing apps and robo-advisors, RS2 represents the infrastructure play—the company that enables others to be innovative. They've built particular strength in payments orchestration and acquiring, areas where fragmentation across European markets creates real complexity. The company's positioning is fundamentally B2B, serving financial institutions that need to modernize their tech stacks rather than competing directly for customer wallets. For European fintech, RS2 is part of the connective tissue that allows the entire ecosystem to function more efficiently and move faster.

Founded 2005

SIX Group

SIX Group is Switzerland's financial market infrastructure backbone, operating the plumbing that connects banks, exchanges, and payment systems across Europe. Rather than chasing consumer trends or startup disruption, SIX owns the rails—managing everything from securities trading to cash settlement to card processing for some of the continent's most critical financial flows. The company sits at the intersection of legacy banking infrastructure and modern fintech, wrestling with how to make centuries-old market mechanics work in a faster, more digital world. For European banks and financial institutions, SIX isn't a vendor you choose for innovation; it's the foundational architecture your business runs on. The group has been gradually modernizing its core systems while extending into new areas like digital asset services and API-first banking infrastructure, attempting to position itself as both custodian of traditional finance and enabler of what comes next. What makes SIX different is its monopoly-like position in Swiss and broader European settlement—you don't disrupt SIX, you integrate with it. The company's real challenge isn't competition but the looming shift toward decentralized finance and the pressure from regulators and customers to open its ecosystem faster. SIX represents the old guard of financial infrastructure, now grappling with whether it can evolve quickly enough to remain relevant as fintech rewrites the rules around what settlement, trading, and clearing actually mean.

Founded 1995

Tuum

Tuum is a European fintech infrastructure platform that lets financial services companies build, launch and scale digital financial products without needing to rebuild core banking technology from scratch. Rather than forcing clients to choose between legacy systems and risky custom development, Tuum offers a composable, API-first core that handles accounts, cards, payments and compliance out of the box. The platform runs on a modern cloud architecture designed for European regulation, making it particularly valuable for neobanks, fintechs and traditional institutions looking to move fast. What sets Tuum apart is its philosophy of modularity. Instead of locking companies into monolithic solutions, it lets teams plug in best-of-breed providers for specific functions while maintaining a single source of truth for customer and transaction data. This approach has resonated with the European market where regulatory complexity and fragmentation across jurisdictions make standardized solutions risky. Tuum's customer base spans neobanks, embedded finance platforms and regional banks across the continent, many of whom have used the platform to launch products in months rather than years. The company operates in a crowded space—Mambu, Thought Machine and others offer similar infrastructure plays—but Tuum has built particular strength in payment orchestration and multi-entity management, critical capabilities for scaling across European markets. In the broader fintech stack, Tuum represents the infrastructure layer that enables a new generation of financial products by democratizing access to sophisticated banking technology.

Founded 2018

SIX

SIX is Europe's infrastructure backbone for financial markets—a Swiss-headquartered operator that runs the plumbing connecting banks, brokers, and exchanges across the continent. Rather than chasing consumer apps or flashy fintech positioning, SIX owns and operates the unsexy but critical systems: clearing houses, settlement networks, and real-time gross settlement rails that move trillions daily. The company manages Swiss stock exchanges, operates custody systems, and runs payment infrastructure that underpins everything from retail trading to institutional finance. For decades, SIX has been the quiet operator—the kind of company that doesn't need marketing because its services are non-negotiable for anyone serious about financial markets in continental Europe. Its footprint spans Switzerland, Germany, Austria, and beyond, making it indispensable infrastructure rather than a trendy challenger. While newer fintechs obsess over user experience and branding, SIX owns the rails they all depend on. The company is essentially the financial circulatory system of continental Europe, processing settlements, managing indices, and providing the foundational technology that keeps markets functioning. For institutions, regulators, and market participants, SIX isn't optional—it's the standard. In an era where fintech disruption gets all the headlines, SIX represents the opposite: unglamorous, mission-critical infrastructure that quietly enables the entire ecosystem to function. This positioning makes SIX a crucial player in European financial infrastructure, even if it rarely appears in consumer-facing fintech discussions.

Founded 1934