Some technical issues are negotiating points. They reduce your price or change your deal terms. Others make acquirers walk away entirely. They represent risks that experienced buyers won't take regardless of price.

Here are the five red flags that most often kill deals, and how to address them before they become problems.

Red Flag #1: Security Vulnerabilities with Customer Data

This is the biggest deal killer. Acquirers inherit liability. If your system has security vulnerabilities that expose customer data, you're asking them to buy a lawsuit waiting to happen.

What Acquirers Check

• Known vulnerabilities in dependencies
• Authentication and authorization implementation
• Data encryption at rest and in transit
• Access controls and audit logging
• History of security incidents
• Penetration test results

What Kills Deals

• Unpatched critical vulnerabilities
• Customer data stored without encryption
• Hardcoded credentials in code or configs
• No audit trail for data access
• Previous breaches without proper remediation
• SQL injection or XSS vulnerabilities in production

How to Address

Immediate:

• Run vulnerability scans and fix critical issues
• Remove hardcoded secrets
• Implement proper encryption
• Review and tighten access controls

Ongoing:

• Establish regular security scanning
• Implement security update processes
• Create and test incident response plans
• Consider third-party security audit

For Due Diligence:

• Document security practices
• Provide penetration test results
• Disclose and explain any past incidents
• Show security improvement over time

Red Flag #2: Code You Don't Own

If you don't clearly own your code, acquirers don't know what they're buying. This creates legal uncertainty that can kill deals or drastically reduce valuations.

What Acquirers Check

• IP assignment from employees and contractors
• Open source license compliance
• Third-party code usage and licensing
• Patents and patent exposure
• Any ongoing IP disputes

What Kills Deals

• Contractors who never assigned IP
• Unlicensed use of commercial software
• GPL code in proprietary products without compliance
• Former employees claiming code ownership
• Unresolved IP litigation

How to Address

Immediate:

• Audit all contractor and employee agreements
• Review all third-party and open source usage
• Identify and resolve any gaps

Remediation:

• Obtain missing IP assignments
• Replace problematic dependencies
• Ensure license compliance
• Resolve any disputes

For Due Diligence:

• Document all IP ownership clearly
• Provide license audit results
• Explain any historical issues and resolution
• Show clean chain of ownership

Red Flag #3: Single Point of Failure (People)

If one person holds critical knowledge and they leave, the acquirer inherits a crisis. This is especially problematic when that person is the founder who's exiting.

What Acquirers Check

• Who understands each system?
• Is critical knowledge documented?
• What happens if key people leave?
• Are there retention agreements?
• How distributed is expertise?

What Kills Deals

• One person who understands the entire system
• Critical systems with no documentation
• Key technical person planning to leave immediately
• No succession or transition plan
• Tribal knowledge with no transfer strategy

How to Address

Immediate:

• Identify single points of failure
• Begin documenting critical knowledge
• Cross-train team members
• Create succession plans for key roles

Team:

• Discuss retention with key people
• Address concerns about acquisition
• Create incentives for staying through transition
• Develop backup capabilities

For Due Diligence:

• Show knowledge distribution
• Provide documentation coverage
• Present retention commitments
• Demonstrate transition planning

Red Flag #4: No Path Forward (Technology Dead Ends)

If your technology stack is obsolete with no migration path, acquirers see a forced rewrite. That cost often exceeds what they'd pay for the acquisition.

What Acquirers Check

• Language and framework versions
• Vendor and platform support status
• Community activity and future
• Upgrade and migration paths
• Cloud compatibility

What Kills Deals

• End-of-life languages without migration plan
• Deprecated frameworks with no path forward
• Vendors who've discontinued products
• Legacy systems that can't be modernized
• Architecture that can't move to cloud

How to Address

Assessment:

• Inventory all technology components
• Check support and lifecycle status
• Identify end-of-life or deprecated items
• Evaluate migration options

Planning:

• Create migration roadmaps
• Estimate costs and timelines
• Start migrations where feasible
• Document blockers and plans

For Due Diligence:

• Show awareness of technology status
• Present migration plans
• Demonstrate progress on critical items
• Provide realistic cost estimates

Red Flag #5: Can't Prove It Works (No Testing)

If you can't demonstrate that your system works correctly, acquirers can't trust what they're buying. Changes become risky. Bugs are discovered in production. Due diligence can't verify functionality.

What Acquirers Check

• Automated test existence and coverage
• Test quality and reliability
• CI/CD pipeline status
• Bug rates and trends
• Production stability history

What Kills Deals

• No automated tests at all
• Test suites that are disabled or ignored
• High production bug rates
• Frequent outages or incidents
• No way to verify critical functionality

How to Address

Immediate:

• Establish basic test coverage for critical paths
• Fix or remove broken tests
• Set up continuous integration
• Begin tracking quality metrics

Ongoing:

• Expand test coverage systematically
• Improve test quality
• Reduce bug rates
• Stabilize production

For Due Diligence:

• Show test coverage metrics
• Demonstrate CI/CD pipeline
• Present quality trend data
• Provide incident history with context

The Common Thread

These five red flags share something: they represent unbounded risk.

Security vulnerabilities? Unbounded legal and financial liability. Ownership issues? Unbounded legal complexity. Single points of failure? Unbounded knowledge risk. Technology dead ends? Unbounded rewrite costs. No testing? Unbounded quality risk.

Acquirers can price known, bounded problems. They walk away from unbounded ones.

How to Self-Assess

Before entering any exit process, honestly evaluate:

Security:

• When was your last security review?
• Do you have any known unpatched vulnerabilities?
• Is customer data properly protected?
• Could you pass a penetration test?

Ownership:

• Do you have IP assignments from all contributors?
• Have you audited open source usage?
• Are there any ownership disputes?
• Is your chain of title clean?

Knowledge:

• Are there single points of failure?
• Is critical knowledge documented?
• Could the team operate without any one person?
• Are key people committed through transition?

Technology:

• Is anything end-of-life?
• Are there unsupported components?
• Is there a path forward for everything?
• Could you migrate to modern infrastructure?

Quality:

• Do you have meaningful automated tests?
• Does your CI/CD pipeline work?
• What are your bug and incident rates?
• Can you demonstrate that things work?

The Path to Deal Readiness

If you have red flags, you have options:

Address Them: Most red flags can be fixed with time and investment. Start early.

Document Them: If you can't fix them, document them clearly with remediation plans. Proactive disclosure builds trust.

Price Them: Understand the valuation impact. Sometimes accepting a lower price is better than delaying.

Get Help: Some issues require expertise. Security audits, legal review, and technical assessment can identify and help address problems.

At Topcode, we help founders identify and address technical red flags before they become deal problems. When you work with us on exit planning, we assess your technology the way acquirers will, flag the issues that matter most, and help you create a path to deal readiness.

Because the best time to discover red flags is before buyers do. And the second best time is now.