Trust in fintech: passing bank due diligence at Series A speed

The Series A Reality Check: Compliance is not an Afterthought

The biggest mistake I see fintech founders make is treating ISO 27001 like a badge to be bought. A bank’s procurement team isn't interested in the certificate on your wall; they are interested in the Annex A controls that sit behind it. When you’re at Series A, you are likely burning cash to grow, and the last thing you need is a three-month delay because your 'Access Control Policy' doesn't match how your engineers actually push code.

To pass at speed, you must treat your Information Security Management System (ISMS) as a product. This means your policies shouldn't live in a dusty PDF; they should be reflected in your GitHub workflows and your IAM (Identity and Access Management) settings. If you claim to have MFA on all systems, the bank will ask for a timestamped screenshot of your admin panel. If you can’t produce it in ten minutes, you’ve lost their trust.

• The Information Security Policy (Clause 5.2): No more generic templates.
• The Risk Assessment (Clause 6.1.2): Specifically addressing financial fraud and data integrity.
• The Statement of Applicability (SoA): A clear map of which controls you own and which your cloud provider handles.
• The Internal Audit Report: Proof that you actually follow your own rules.

Decoding the Bank Mindset: Why They Ask What They Ask

Banks are inherently risk-averse institutions regulated by entities like the FCA or the ECB. When they look at a Series A fintech, they don't see an innovator; they see a potential 'Fourth-Party Risk.' This means their due diligence (DDQ) will be significantly more invasive than a standard B2B SaaS review. You are being audited as if you were an extension of the bank’s own infrastructure.

You need to be prepared for the 'Spreadsheet of Death'—a 200-question DDQ covering everything from encryption at rest to the physical security of your co-working space. I advise firms to build a 'Response Library' mapped to ISO 27001 clauses. When a bank asks about your 'Cryptography Policy,' you shouldn't be writing a new answer; you should be copying a pre-verified statement that references Clause A.8.24 of the 2022 standard.

• 4th Party Risk: Who do your suppliers use? (e.g., your hosting provider's CDN).
• Financial Crime (FinCrime): AML and KYC integration into the security stack.
• Data Residency: Proof that PII never leaves the agreed-upon jurisdiction.
• Exit Planning: How the bank gets their data back if you go bust.

Operationalising Trust: From Spreadsheets to Automation

At Series A, your team is likely small and overstretched. You cannot afford to have your Head of Engineering spending 40 hours a week chasing screenshots for an auditor. This is where the 'Compliance-as-Code' mindset becomes a competitive advantage. By using a platform to automate evidence collection, you turn a biannual scramble into a continuous, quiet background process.

When dealing with a Tier-1 bank, 'speed to evidence' is a metric of its own. If you can provide a SOC2 Type 2 or an ISO 27001 Stage 2 report immediately upon request, you signal that your operations are mature. This reduces the 'Risk Premium' the bank associates with your firm, often leading to better commercial terms and a faster path through the legal review stage.

• Automated Evidence Collection: Scripts that pull logs into your GRC platform.
• Continuous Monitoring: Moving away from 'Point-in-Time' audits.
• Centralised Risk Register: One place to track vulnerabilities and business threats.
• Training Records: Automated proof that 100% of staff took their security modules.

The Resilience Requirement: More than just Uptime

Banks are terrified of downtime. If your fintech processes payments or handles ledger data, your 'Availability' is as important as your 'Security.' During Series A due diligence, expect a deep dive into your Business Continuity and Disaster Recovery (BC/DR) plans. They aren't looking for a perfect track record; they are looking for evidence of 'Resilience.'

This means you must demonstrate that you have tested your backups and ran a tabletop exercise for a ransomware attack. Most fintechs fail here because their BCP is a template they haven't read. To pass at speed, provide the bank with a summary of your last 'Failure Mode Effect Analysis' (FMEA). Showing that you understand exactly how your system fails makes you a safer bet than someone who claims they never will.

• The BCP (Business Continuity Plan): Scenarios for 'Total Cloud Outage'.
• The DRP (Disaster Recovery Plan): Documented RTO (Recovery Time Objective) and RPO (Recovery Point Objective).
• Load Testing: Evidence that your API won't crumble under the bank's volume.
• Incident Response: A log of past incidents and the 'Post-Mortem' actions taken.

Closing the Deal and Staying Compliant as You Scale

A successful due diligence process ends not with a signature, but with the start of a partnership. To maintain this, you must keep the 'Trust Vault' updated. Post-Series A, as you scale from 20 to 100 people, your risks change. Your ISO 27001 framework provides the structure to manage this growth without the wheels falling off your security posture.

Remember, the bank will likely have 'Right to Audit' clauses in your contract. They may show up, virtually or physically, every year. If you have built your security on a foundation of genuine ISO-aligned processes, these annual check-ins become non-events. You win by making security a boring, predictable part of your business operations, allowing you to focus on the 'Series B' growth goals.

• HR Security (A.6): Vetting and on-boarding/off-boarding processes.
• Asset Management (A.5.9): Knowing exactly where the bank's data lives.
• Supplier Relationships (A.5.19): How you vet your own sub-processors.
• Communication Security (A.8.20): How you protect data in transit.

Frequently asked questions