Architecting Europe’s Largest Open Banking Infrastructure
Building the cloud-native, event-driven backbone that powers a continental savings marketplace, engineered for scale, trust, and compliance.
€35B+
Deposits Processed Across a pan-European savings marketplace spanning more than twenty markets.
200+
Partner Banks Connected through a single, standardised open banking platform.
20+
Countries Served through one unified compliance and operational framework.
30M+
Savers Accessing competitive deposit products through a single, reliable interface.
About The Client
About The Client
Deposit Solutions is a leading European fintech connecting banks, distributors, and consumers across more than twenty markets. Its platform allows savers to access competitive deposit products from partner banks through a single interface, making it the operational backbone of Europe’s largest savings marketplace.
In a financial ecosystem where every transaction carries regulatory, reputational, and operational weight, growth is inseparable from trust. As Deposit Solutions expanded its footprint, the infrastructure beneath it needed to be not just capable, but provably reliable, built to earn the confidence of both regulators and the institutions it connects.
The Challenge
Creating a pan-European open banking marketplace demands more than connecting systems. It requires a foundational platform capable of orchestrating billions in regulated transactions, maintaining end-to-end compliance, and scaling cleanly across jurisdictions, each with its own regulatory expectations and operational norms.
Deposit Solutions had outgrown its monolithic legacy core. The existing architecture could no longer scale horizontally or isolate failures gracefully. Reconciliation and data creation workflows depended on manual oversight, creating delays and compounding compliance exposure. Every new partner bank required custom engineering work, which fragmented governance and slowed the pace of expansion. Meanwhile, infrastructure and maintenance costs were growing faster than system capacity could accommodate.
The challenge was not simply technical. Deposit Solutions needed a complete re-architecture, a secure, resilient, and compliant backbone that could unify operations across the business, automate transaction flows end to end, and support multi-bank interoperability at European scale.
The Approach
Technoidentity partnered with Deposit Solutions to design and build the Open Banking Backbone: a cloud-native, event-driven platform purpose-built for institutional-scale performance, transparency, and compliance. The guiding principle was not to layer resilience on top of existing architecture, but to make reliability a structural property of the system itself.
Rather than treating compliance and auditability as features to be added, the team embedded traceability and recoverability into the core execution model. The result was not an integration layer. It was a fully realised open banking platform capable of sustaining continental transaction volumes with precision and trust.
Enterprise-grade architecture
- Core deposit, reconciliation, and settlement flows were re-engineered as microservices on Kubernetes, delivering elasticity, fault isolation, and independent release cycles across every business domain.
Event-driven transaction layer
- A high-integrity streaming backbone enabled immutable audit trails and idempotent transaction processing, ensuring every deposit, transfer, and reconciliation was traceable, recoverable, and compliant with European regulatory frameworks.
Contract-driven APIs
- Standardised, versioned APIs replaced bespoke connectors, accelerating partner onboarding and ensuring uniform certification standards across 200+ banks operating across multiple jurisdictions.
Unified observability
- Real-time visibility into pipelines, data flows, and system health empowered both engineering and compliance teams with actionable insight, ensuring the platform consistently met operational and regulatory SLAs.
The Impact
The Open Banking Backbone transformed Deposit Solutions’ operations across every dimension that matters in institutional finance: reliability, auditability, scalability, and partner trust. What had been a collection of fragmented, manually managed systems became a cohesive platform built for longevity and growth.
More than €35 billion in deposits now flow through immutable transaction histories, each one fully traceable for regulatory purposes. Over 200 partner banks have been onboarded through standardised governance frameworks, a process that once required custom engineering effort for every institution. The platform spans more than 20 countries, and more than 30 million savers are served through deposit flows that are faster, error-free, and fully transparent.
Perhaps most significantly, compliance and auditability are no longer operational costs. They are structural properties of the platform, present in every transaction and recoverable at any point.
€35B+ Full Regulatory Traceability
Deposits processed with immutable transaction histories ensuring full regulatory traceability.
200+ Partner Banks
Onboarded partner banks with standardised governance and accelerated certification.
20+ Countries
Countries supported through uniform compliance and control frameworks.
30M+ Error Free & Transparent Deposit Flows
30M+ savers served through faster, error-free, and transparent deposit flows.
Why It Matters
By engineering reliability into every component, Technoidentity turned compliance, transparency, and uptime into competitive advantages for Deposit Solutions. This is what Technoidentity calls Durable Product Engineering®: building systems that don’t just function, but endure. For Deposit Solutions, that meant transforming open banking from a series of connections into a unified, trustworthy, and auditable ecosystem, built to carry the weight of a continent.
Frequently Asked Questions (FAQs)
Q: Why do open banking platforms need modern cloud-native architectures?
As open banking ecosystems expand, legacy monolithic platforms often struggle with scalability, resilience, and compliance. In this case, its monolithic legacy core couldn’t scale horizontally or isolate failures gracefully, reconciliation depended on manual oversight, and every new partner bank required custom engineering. Growing infrastructure costs were also outpacing system capacity, so a structural rebuild was required.
Q: How does a durability assessment improve open banking infrastructure?
A durability assessment helps identify architectural weaknesses that impact compliance, fault isolation, and long-term scalability. In this engagement, Technoidentity’s durability assessment services examined the legacy monolith to pinpoint where compliance, traceability, and fault isolation were structurally weak, informing a redesign where reliability, auditability, and recoverability were built into the core execution model rather than layered on afterward.
Q: What scale does the resulting platform now operate at?
The platform processes more than €35 billion in deposits with full regulatory traceability, connects 200+ partner banks through standardised APIs, spans 20+ countries, and serves more than 30 million savers through faster, error-free deposit flows.
Q: What makes an open banking platform both durable and scalable?
A durable and scalable open banking platform combines resilient architecture with end-to-end traceability and fault recovery. In this platform, core deposit, reconciliation, and settlement flows run as independently releasable microservices with an event-driven, idempotent transaction layer, so every deposit and transfer is traceable and recoverable by design. Compliance and auditability became structural properties of the platform rather than added operational costs.