Security is an important part of a startup's technical due diligence because weaknesses in application security, infrastructure, access control, or data handling can create financial and operational risk. Investors want to understand whether the company has reasonable safeguards in place for the product, customer data, and internal systems.
A startup does not need enterprise-level security controls simply because it is preparing for an investment review. However, it should understand its most important risks, address critical weaknesses, and be able to explain how security is managed.
Understand What the Security Review Is Evaluating
The first step is to understand what a technical reviewer is likely to examine. Security due diligence usually focuses on whether the startup has reasonable controls for protecting its systems and data.
Reviewers may examine authentication, authorization, infrastructure, application security, employee access, third-party services, incident response, backups, and compliance requirements.
The expected level of maturity will depend on the startup's product, customers, industry, and stage.
Review Authentication and Identity Management
Start by reviewing how users and employees authenticate to important systems.
For customer-facing applications, examine password handling, session management, account recovery, authentication providers, and multi-factor authentication where appropriate.
Internal systems should also have controlled employee identities rather than shared credentials. Administrative accounts deserve particular attention because their compromise can affect large parts of the technology environment.
Examine Authorization and Access Controls
Authentication establishes who someone is. Authorization determines what that person can do.
Review whether users and employees receive only the permissions required for their responsibilities. Pay particular attention to production systems, databases, cloud accounts, source-code repositories, and administrative dashboards.
Remove unnecessary access from former employees, contractors, and accounts that are no longer required.
Review Sensitive Data Handling
Create an inventory of the sensitive information the startup collects and stores.
This may include customer information, payment-related data, authentication credentials, business records, or other confidential information.
Document where sensitive data is stored, how it moves between systems, who can access it, and how long it is retained. This can reveal unnecessary data exposure or retention practices that should be addressed.
Check Secrets and Credential Management
Search the development environment for exposed credentials and secrets.
API keys, database passwords, cloud credentials, private tokens, and similar information should not be stored casually in source-code repositories or shared through insecure channels.
Review how secrets are stored, accessed, rotated, and revoked. If a credential has previously been exposed, confirm that it has been replaced rather than assuming that removing it from the visible code is sufficient.
Review Cloud and Infrastructure Security
Examine the configuration of the startup's cloud and infrastructure environment.
Review storage permissions, network controls, firewall configurations, production access, environment separation, and administrative privileges.
Development, testing, and production environments should be separated appropriately for the product's risk level. The objective is to reduce the possibility that a problem in one environment can unnecessarily affect another.
Examine Application Security
Application security should be reviewed alongside the codebase.
Look for weaknesses involving input validation, authentication, authorization, file handling, database access, error handling, and other areas relevant to the application.
Startups should also review security vulnerabilities identified through automated scanning, code reviews, penetration testing, or other security assessments.
Review Third-Party Services
Most startups depend on external services for payments, authentication, analytics, communication, cloud infrastructure, monitoring, or other functionality.
Create a list of important third-party providers and understand what information each service receives.
For critical vendors, review their security responsibilities, access requirements, data handling practices, and role in the overall architecture. This helps identify risks that exist outside the startup's direct infrastructure.
Check Dependency and Package Security
Software dependencies can introduce vulnerabilities into otherwise well-maintained applications.
Review important libraries, frameworks, packages, and other external components used by the product. Identify outdated or vulnerable dependencies and determine whether they need to be upgraded.
Dependency management should also include a process for discovering and addressing significant vulnerabilities when they are reported.
Review Security Monitoring and Logging
A startup should have enough visibility to identify important security events.
Review whether the company records relevant authentication activity, administrative actions, application errors, and infrastructure events.
Logs should be protected from unnecessary access and retained for an appropriate period. Monitoring should also make it possible for the team to investigate suspicious activity when necessary.
Examine Incident Response Readiness
Security preparation is incomplete without considering what happens after an incident.
The team should know how it would respond to a suspected breach, compromised account, exposed credential, or other significant security event.
Document who investigates the issue, who makes decisions, how systems are contained, and how affected customers or other stakeholders would be informed when necessary.
If the startup has experienced previous incidents, maintain an accurate record of what happened, how it was resolved, and what changed afterward.
Review Backup and Recovery Controls
Security also involves protecting the company's ability to recover from a serious incident.
Review backup frequency, storage locations, access controls, retention periods, and restoration procedures.
A backup that has never been tested may not provide meaningful recovery protection. Important recovery procedures should therefore be tested periodically and understood by more than one person where practical.
Examine Employee Security Practices
Employees and contractors often have access to systems that can affect the company's security posture.
Review onboarding and offboarding procedures, account provisioning, access removal, device security, and handling of company credentials.
When an employee leaves, their access to repositories, cloud systems, production environments, and other company services should be removed promptly.
Review Compliance and Privacy Requirements
Some startups operate in industries or markets where specific privacy or security requirements apply.
Review the regulations, contractual requirements, and customer expectations relevant to the business.
The goal is not to collect compliance certifications simply for an investor review. Instead, the startup should understand which requirements apply and identify any meaningful gaps.
Identify Security Risks Before the Review
Create a security risk register before technical due diligence begins.
For each issue, record:
- The security risk
- The affected system
- Potential business impact
- Current mitigation
- Remediation owner
- Expected completion timeframe
This makes it easier to distinguish critical vulnerabilities from lower-priority improvements.
Decide What to Fix Before Due Diligence
Not every security issue needs to be completely resolved before a review.
Prioritize problems that could create serious customer, financial, operational, or legal consequences. Exposed credentials, excessive production access, critical vulnerabilities, missing backups, and major data protection weaknesses generally deserve greater attention than cosmetic improvements.
For issues that cannot reasonably be fixed before the review, prepare an honest explanation and a practical remediation plan.
Prepare Security Evidence
Technical reviewers may request evidence supporting the startup's security practices.
Depending on the business, this could include security policies, access-control documentation, vulnerability assessments, penetration testing reports, incident records, backup procedures, vendor information, and privacy documentation.
Keep the evidence organized and ensure that sensitive security information is shared through appropriate channels.
Avoid Creating Security Theater
Preparing for due diligence should not become an exercise in installing controls that nobody actually uses.
A startup is better served by a smaller set of meaningful security practices that are understood and maintained than by a large collection of policies that exist only on paper.
Security preparation should reduce real risk rather than simply make the company appear more mature during an investor review.
Conduct an Internal Security Review
Before the external assessment begins, conduct a final internal review.
Check whether important controls are actually working, whether documentation matches reality, whether former users still have access, and whether critical security issues have clear owners.
An internal review can also help the team prepare for questions about security architecture, incidents, access controls, data handling, and future improvements.
Final Thoughts
Security review preparation should focus on understanding and reducing meaningful risk rather than trying to create the appearance of perfect security.
Startups should examine access controls, sensitive data, credentials, infrastructure, application security, dependencies, monitoring, incident response, backups, employee access, and applicable compliance requirements.
A startup that can clearly explain its security practices, acknowledge its limitations, and demonstrate a sensible remediation process is in a much stronger position during technical due diligence.
Further Reference
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