For us, security isn’t just a box to check. It’s part of how we build the product.

Stacks handles sensitive workflows, reconciliations, journal entries, and financial commentary, which are deeply integrated into our customers’ finance operations. This means that security and privacy cannot exist as a separate compliance layer; they must be embedded in the product from day one.

It Starts With the Team

We’ve built financial systems before, at scale.

Our team has helped build core infrastructure at companies like:

• Uber (Payments and Fintech)

• Plaid (Financial Data Infrastructure) 

• Mollie (Payment processing at volume)

• Bunq (European mobile banking)

That experience shaped how we think about secure architecture, data isolation, and auditability. It also means we’ve seen how security failures happen when they’re bolted on late. So, at Stacks, we design for it upfront.

Security Is Baked Into the Product

We treat security as a first-class product requirement, not an afterthought. Here’s how that shows up:

• Fine-grained access controls: Role-based access by workspace, entity, and module.

• Audit trails everywhere: Every task, comment, and change is timestamped and immutable.

• Data never leaves our cloud unless it's encrypted and controlled

• Proactive anomaly detection: Not just for your books, but also for behaviors that might signal risk.

• SSO and Identity Management: SAML 2.0 support and full control over account access.

• Data residency and segregation: Your financial data is encrypted in transit and at rest.

More on our technical approach, here.

AI-Native, Privacy-First

Stacks is an AI-Native company. But we take an equally strong stance on data control, transparency, and privacy.

Let’s make it clear:

• We’ll never share or sell your data.

• Your data is never used to train public AI models.

• Your data stays your data—always.

Our AI features are designed with strict boundaries. We train models using anonymized patterns, not customer-identifiable content. And we operate under a principle of zero trust by default, with strict access controls, encryption at every layer, and full auditability.

Enterprise Compliance Standards

We meet leading industry standards for financial data and enterprise security:

• SOC 2 Type I certified, SOC 2 Type II is under observation

• GDPR-compliant

• Data encrypted at rest and in transit (AES-256, TLS 1.2/1.3)

• Penetration testing and regular security audits

• Vendor risk and supply chain reviews

These certifications aren’t static, they’re continuously tested and improved as part of our internal controls and operations playbook. In addition, we’re in the process of ISO certifications to meet EU standards.

Want to Go Deeper?

Visit our Security & Trust Center to:

• Access our latest compliance reports

• Download our security whitepaper

• Request a detailed security overview for your IT or procurement team

Security isn’t a feature. It’s part of how we build.

And we’ll keep treating it that way because the integrity of your close depends on it.