Security is a slide. It can save the term sheet.

Akande Simpa Lead Security Engineer & Cofounder, Simpa Labs CEH (Certified Ethical Hacker)

The changing VC landscape in Nigeria

Early-stage fundraising in Nigeria is no longer just about the pitch. Investors like Ventures Platform, Microtraction, and international funds require deep technical due diligence. If your team cannot articulate how you protect transaction integrity, the deal slows down or collapses.

Historically, a high growth rate was enough to seal a deal in the Lagos fintech scene. Founders showed a hockey-stick chart of transaction volume and active wallets, and the check was signed. But after several high-profile fraud incidents that depleted seed capital across the ecosystem, the criteria have changed. Investors have observed how quickly unsecured systems can drain millions of Naira. When your platform connects to the Nigerian Inter-Bank Settlement System (NIBSS) or relies on virtual accounts from partner banks like Wema Bank or Providus Bank, you inherit a complex web of risk. A single backend flaw can result in severe financial losses and prompt regulatory intervention from the Central Bank of Nigeria (CBN). Consequently, VCs now deploy technical auditors to inspect your code, review your architecture, and verify your security posture before releasing funds.

The 3 things VCs check in technical diligence

During technical diligence, investors focus on three specific areas to verify that your startup is built on a secure foundation:

• Compliance status: VCs check your regulatory alignment. They want to see your CBN licensing process (or your partnership agreements with licensed entities), your Nigeria Data Protection Commission (NDPC) registration under the NDPA, and your PCI DSS scope if you process card data. Missing or incomplete registrations represent an immediate regulatory risk that can stop your operations.
• Core architecture: Auditors inspect your system design. They check your ledger integrity to confirm you protect against double-spending. They check your secrets management to verify you have no API keys or database credentials stored in your code repository. They also inspect your network isolation to make sure your database is not accessible from the public internet.
• Vulnerability management: Investors want proof of independent, manual security assessments. Automated scans are not enough. They look for recent penetration testing reports from a specialized firm to verify that business logic flaws—which automated scanners miss—have been identified and patched.

Let's look at a typical attack path that a diligence auditor flags immediately. Suppose a startup uses webhooks to receive transaction notifications from payment gateways like Paystack or Flutterwave. If the developers hardcoded the secret key in the repository or failed to verify the signature of the incoming webhook, an attacker can spoof payments and credit their wallet balance without spending a single Naira.

Here is an example of a vulnerable webhook handler payload that an auditor would flag as a critical security threat:

POST /api/v1/payments/webhook
Host: api.yourfintech.com
X-Paystack-Signature: 3c9d78...
Content-Type: application/json

{
  "event": "charge.success",
  "data": {
    "id": 4039281,
    "domain": "live",
    "status": "success",
    "reference": "ref_992039",
    "amount": 10000000,
    "currency": "NGN",
    "metadata": {
      "wallet_id": "9021"
    }
  }
}

The corresponding vulnerable webhook handler in the backend codebase might look like this:

// Bad: Verification with hardcoded key, no database locking
app.post('/api/v1/payments/webhook', async (req, res) => {
  const signature = req.headers['x-stack-signature'];
  const secret = \"sk_live_9a2b8c...\"; // Hardcoded secret checked into Git
  
  // Insecure: Crediting wallet without locking the row or checking reference reuse
  const wallet = await db.wallets.findOne({ id: req.body.data.metadata.wallet_id });
  const newBalance = wallet.balance + req.body.data.amount;
  await db.wallets.update({ balance: newBalance }, { where: { id: wallet.id } });
  
  return res.status(200).send(\"Success\");
});

Business Impact

The business consequences of having these architectural gaps exposed during due diligence are severe. First, direct financial losses from ledger manipulation or webhook spoofing can deplete your actual cash reserves before you close the funding round. Second, the regulatory fines are substantial. The NDPC can fine your business up to 2% of your annual gross revenue or 10 million Naira (whichever is higher) for data protection failures under the NDPA. Also, the CBN imposes severe penalties for non-compliance with the Risk-Based Cybersecurity Framework, including the suspension of license applications or operational restrictions.

For VCs, these findings are not just technical bugs; they represent existential operational risks. If your systems are not secure, the investor's capital will be spent covering fraud losses or paying regulatory fines rather than building product. In the worst cases, this friction leads to the withdrawal of the term sheet entirely, leaving your startup without runway.

The “Security Slide” framework

Instead of hiding your security posture, you must display it proudly. A dedicated security slide in your pitch deck preempts investor concerns and shows that your team possesses institutional discipline. Your slide must address three specific pillars:

• “Security by Design”: Detail how you protect system secrets and data. Specify that you use a Key Management Service (KMS) rather than local configurations. Show that your team rotates API keys regularly and segregates production databases from development environments.
• “Third-Party Validation”: List your external security assessment history. State the name of your independent penetration testing partner and the date of your last assessment. Sharing that you undergo regular, manual testing shows that you do not rely on basic automatic scans.
• “Incident Readiness”: Present your business continuity metrics. Mention your backup frequencies, your recovery time objectives (RTO), and your data protection insurance status.

To address the webhook spoofing risk shown earlier, your engineering team must implement a secure signature verification pattern and database transactions with pessimistic locking to protect ledger integrity.

Here is the secure implementation that your engineering team should ship:

import crypto from 'crypto';
import { db } from '../database';

async function handlePaystackWebhook(req: any, res: any) {
  const signature = req.headers['x-paystack-signature'];
  const webhookSecret = process.env.PAYSTACK_WEBHOOK_SECRET; // Stored in environment variable
  
  if (!signature || !webhookSecret) {
    return res.status(401).json({ error: 'Missing security configuration' });
  }
  
  const hash = crypto
    .createHmac('sha512', webhookSecret)
    .update(JSON.stringify(req.body))
    .digest('hex');
    
  if (hash !== signature) {
    return res.status(400).json({ error: 'Invalid signature verification' });
  }

  const { reference, amount, metadata } = req.body.data;
  const walletId = metadata.wallet_id;

  try {
    await db.transaction(async (tx) => {
      // 1. Prevent replay attacks by checking if transaction reference is already processed
      const existingTx = await tx.ledger.findFirst({
        where: { reference }
      });
      if (existingTx) {
        throw new Error('Transaction reference already processed');
      }

      // 2. Lock the specific wallet row to prevent concurrent race conditions
      const wallet = await tx.$queryRaw`
        SELECT balance FROM \"Wallet\" WHERE id = ${walletId} FOR UPDATE
      `;

      if (!wallet || wallet.length === 0) {
        throw new Error('Wallet not found');
      }

      const newBalance = wallet[0].balance + amount;

      // 3. Update the wallet balance
      await tx.wallet.update({
        where: { id: walletId },
        data: { balance: newBalance }
      });

      // 4. Create ledger record to prevent double-spending
      await tx.ledger.create({
        data: {
          reference,
          amount,
          walletId,
          status: 'SUCCESS'
        }
      });
    });

    return res.status(200).json({ status: 'success' });
  } catch (error: any) {
    return res.status(400).json({ error: error.message });
  }
}

Translating security into business value

Do not list dry technical specifications like “TLS 1.3” or “AES-256 encryption” on your pitch deck. VCs are risk allocators, not systems administrators. You must translate technical configurations into direct business metrics that investors understand.

For example, instead of explaining your hashing algorithms, state: “Zero transaction fraud incidents since launch.” Instead of talking about database configurations, write: “Fully compliant with the CBN Risk-Based Cybersecurity Framework.” Replace vague statements about server security with: “Clean independent audit reports on file for enterprise banking partners.”

This framing shifts security from a cost center to a competitive advantage. It demonstrates that you can scale transaction volumes without attracting regulatory sanctions or partner blockades.

The cost of late-stage due diligence friction

If the VC's technical partner audits your code and finds insecure practices, the round gets delayed. Identifying hardcoded keys in git, missing authorization checks, or loose database rules introduces friction at the worst possible time.

Many early-stage startups operate on tight runways, often with less than three months of operating capital. A four-to-six-week delay in disbursement while your engineering team scrambles to remediate basic structural flaws can create a critical cash crunch. In some cases, the delay is fatal. If the audit reveals that your core ledger is unreliable or that customer data is unprotected, the VC may pull the term sheet completely. They will conclude that the engineering team lacks the operational maturity to manage millions of Naira safely.

The fix — preparing your “Diligence Room”

To avoid this friction, you must build a clean, ready-to-inspect diligence room. Do not wait for the investor to request these files. Prepare them in advance so you can share them the moment interest is confirmed:

• Manual Pentest Executive Summary: Keep a current summary of your latest manual pentest report on file. This shows that independent security experts have thoroughly inspected your endpoints and verified your defenses.
• Signed NDA & Security Brief: Have a signed NDA and a brief outlining your security controls ready for immediate sharing.
• Compliance Posture One-Pager: Document your compliance status (NDPA registration, PCI DSS scope, and CBN guidelines) in a clear one-page summary.
• Engineering Roadmap Integration: Show that security updates are prioritized in your active engineering roadmap. A backlog containing security remediation tasks shows that you treat security as a continuous engineering process, not a check-the-box exercise.

By organizing these artifacts, you prove that your team treats security as a core operational standard rather than a reaction to due diligence pressure.

Related reading

Blog: Launch First, Secure Later: The Cost of VC Diligence Friction in Nigeria · Fintech Security for Startups

Services: Secure architecture review · API security testing · Penetration testing