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Technical Due Diligence Checklist (2026): What Investors Actually Examine

CTO on Demand Free Intermediate

This is the structured checklist an investor's technical reviewer runs, covering architecture, code quality, key-person risk, security, and licensing. Even if you are not raising, hand it to your paid reviewer so the few hours are spent on what matters. It also flags key-person and open-source-license risks that agency builds often hide.

  • Seven areas structure a proper review
  • Key-person risk matters as much as the code itself
  • Check open-source licenses buried in inherited code

The question it answers

  1. How do I evaluate the code quality of a build I inherited from an agency?

Read with it

  1. Directly answers the scoping question non-technical founders wrestle with, build in-house vs. outsource, backed by patterns... YC Startup Library Article · ~10 min read Does Your Tech Startup Really Need a Technical Co-Founder? (Yes) Y Combinator
  2. This is the most concrete checklist we found for a founder who cannot read the code but can watch the behavior. It names the... VeryCreatives Article 10 Software Development Red Flags Every Non-Technical Founder Should Know Mate Varkonyi
  3. Before you pay anyone for a full review, point SonarQube at the repository for a cheap, automated first read. It scans over 40... SonarSource Tool · Tool, setup in an afternoon SonarQube Sonar (SonarSource)
  4. This is the canonical framing for exactly your question: not all messy code is the same. Fowler splits debt on two axes,... martinfowler.com Essay · About a 5 minute read Technical Debt Quadrant Martin Fowler
  5. This is the practical manual for improving code you are afraid to touch, without a rewrite. Feathers gives you techniques to... Prentice Hall (Robert C. Martin Series) Book · 456 pages Working Effectively with Legacy Code Michael C. Feathers
  6. The CTO of India's largest broker explains how a tiny team scales huge load by optimizing the application before touching... Zerodha Tech Blog Article · 15 min read Scaling with common sense Kailash Nadh
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