Technology Due Diligence

Technology Due Diligence (Tech DD) is the systematic evaluation of a target company's software systems, architecture, infrastructure, security posture, and engineering team. Conducted during an acquisition or investment round, it identifies hidden technical risks, evaluates scalability potential, and determines whether the technology can support the buyer's strategic goals.

For a CTO, Tech DD is where finance, business strategy, and engineering realities collide. Whether you are conducting the investigation (buy-side) or defending your own stack (sell-side), Tech DD is not an academic code review—it is a pragmatic risk-management exercise. The goal is to uncover "red flags" that could break the deal, impact valuation, or require significant post-deal investment to remediate.

The Due Diligence Workflow

A typical Tech DD process follows a structured timeline. Understanding this sequence helps you anticipate requests and manage stakeholders effectively.

The Four Pillars of Tech DD

When evaluating a company's technology, you must look beyond the code. A comprehensive assessment covers four core dimensions:

1. Architecture & Codebase Quality

This evaluates the software's structural health, maintainability, and legal compliance.

  • Technical Debt: Are you inheriting a clean, modular service-oriented architecture or a tightly coupled monolithic spaghetti code?
  • Open-source Licence Compliance: Are there copyleft licences (e.g., GPL, AGPL) mixed into proprietary code? This is a major legal risk that could force the buyer to open-source their own IP.
  • Third-party Dependencies: Is the codebase reliant on deprecated, unmaintained, or vulnerable libraries?
  • Documentation: Are there up-to-date system designs, API specifications, and READMEs, or is the architecture stored solely in the heads of a few engineers?

2. Infrastructure & Operations

This examines the live environment, hosting costs, and how the software is operated day-to-day.

  • Cloud Architecture: Is the infrastructure modern (containerised, infrastructure as code, automated scaling) or a collection of manually configured virtual machines?
  • Scalability Bottlenecks: Can the system handle a 5x or 10x increase in load tomorrow? Where are the performance bottlenecks (e.g., database read/write limits, single-point-of-failure servers)?
  • Disaster Recovery (DR) & Business Continuity: Are backups automated, replicated, and regularly tested? What are the actual RTO (Recovery Time Objective) and RPO (Recovery Point Objective)?
  • Operational Cost Optimisation: Is the target company running cloud resources efficiently, or is their hosting bill bloated due to poor resource utilisation?

3. Security & Data Privacy

This checks how well the company protects its systems and its users' data, ensuring regulatory compliance.

  • Compliance Frameworks: Does the target meet standard regulations (GDPR, HIPAA, PCI-DSS) or security frameworks (SOC2, ISO 27001)?
  • Vulnerability Management: When was the last independent penetration test? How quickly does the team patch known vulnerabilities?
  • Data Governance: Where is PII (Personally Identifiable Information) stored, how is it encrypted, and who has access to it?

4. People & Organisation

A great product with a broken team is a high-risk investment. You must evaluate the human element of the technology.

  • Key Person Risk (Bus Factor): If the lead architect or founder leaves post-acquisition, will the system collapse? How concentrated is the codebase knowledge?
  • Team Topologies & Delivery Velocity: How is the engineering team structured? Are they set up for fast flow, or are they bogged down by cross-team dependencies and bureaucratic processes?
  • Developer Culture & Attrition: What is the historical staff turnover rate? What is the morale of the engineering team?

Strategic Utility: Sell-Side Preparation

If you are a startup or scale-up CTO preparing for an investment round or acquisition, your goal is to minimise friction and prevent deal delays. A disorganised Tech DD process raises suspicion and can lead to a lower valuation.

Pre-DD Checklist for CTOs

  1. Generate a Software Bill of Materials (SBOM): Run automated scanning tools (e.g., FOSSA, Snyk) to audit all open-source dependencies and ensure no copyleft licences are present.
  2. Clean up documentation: Ensure you have high-level system diagrams (such as C4 diagrams), data flow maps, and onboarding guides ready to share.
  3. Audit your cloud spend: Perform an infrastructure cleanup. Terminate unused dev instances and show that you understand your Total Cost of Ownership.
  4. Collate security reports: Gather recent penetration test reports, SOC2 audit certificates, and documented remediation plans.
  5. Calculate team metrics: Have clear reports on your delivery velocity, code coverage, deployment frequency, and historical attrition.
Tip

Do not try to hide technical debt. Every codebase has it. Instead, document your key technical debt areas and present a clear prioritised roadmap for how you plan to address them. Investors respect a CTO who is aware of their system's limitations and has a realistic plan to fix them.

Strategic Utility: Buy-Side Investigation

If you are evaluating a target company for acquisition, you must adopt an adversarial but objective mindset. Do not get distracted by a polished UI or a charismatic management presentation.

The Big Red Flags

  • The "Black Box" Core: A core algorithm or system that only one person (often the founder) understands, with zero documentation and no test coverage.
  • Under-licensed Code: Critical intellectual property built on top of copyleft code, which could trigger legal action or force the public disclosure of proprietary algorithms.
  • Manual Deployment and Operations: A delivery pipeline that relies on manual SSH commands, with no automated tests and zero infrastructure-as-code automation.
  • Bloated Cloud Costs: A target company with high customer acquisition costs but also unsustainably high cloud costs per user, indicating poorly designed queries or unoptimised architectures.
  • No Pen Tests or Security Incidents Log: A company that claims they have "never had a security incident" but has never performed a penetration test or set up basic intrusion detection.
Important

Always cross-reference the management's claims with raw data. Ask for access to the Git repository, the cloud billing dashboards, and the security logs. If a target company is hesitant to grant read-only access to these systems during the late stages of DD, consider it a significant red flag.

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References

Created: July 10, 2026Last modified: July 10, 2026