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Software Investing PlaybookPublished by Golden Door Asset

How to underwrite software businesses.

A practical playbook for evaluating software companies — Rule of 40, unit economics, moats, and the four-pillar framework we use to separate durable monopolies from narrative traps.

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Audience: CEO · Founder · President · $250,000+ / Year tech budget
Focus: Software as an asset class
Asset Class Fundamentals

Why software still wins as an investment

Software businesses can scale with near-zero marginal cost of reproduction, high gross margins, and recurring revenue. The question is not whether software is attractive — it is which companies clear institutional underwriting standards.

75%
Baseline gross margin
90%+
Agentic margin target
<12 mo
CAC payback target
40%+
Rule of 40 hurdle
Analytical Framework

Four pillars of software underwriting

The same lens we use across research memos and portfolio monitoring — not a consulting checklist.

API Momentum

Is product usage compounding through APIs and agentic interfaces — or stuck in legacy UI seats?

Midas Grade

Composite quality score across growth, profitability, efficiency, R&D intensity, and balance sheet strength.

Data Gravity

Does the product accumulate proprietary data that makes switching costly and models smarter over time?

Valuation

What multiple is justified by Rule of 40, retention, and margin structure — not narrative alone?

Interactive Tool

Rule of 40 calculator

Revenue growth % + free-cash-flow margin % should clear 40 for high-quality software businesses. Adjust the inputs to see where a company lands.

30%
15%
Score
45

Excellent — clears the institutional hurdle

Formula: 30% growth + 15% FCF margin = 45

Investment Screens

Compounders vs traps

A simple screen before you dig into a memo or diligence packet.

Compounder

Own / Overweight
  • Rule of 40 ≥ 40 with durable NRR
  • Gross margins expanding toward 80%+
  • Clear data or workflow moat

Quality Growth

Selective
  • Rule of 40 25–40 with improving FCF
  • Path to payback under 18 months
  • Moat forming but not yet proven

Trap

Avoid / Short
  • Growth without path to cash
  • Seat-based model with no API leverage
  • Multiple priced for perfection
Next Step

Go deeper on the investment thesis

Built for CEO · Founder · President evaluating software as an asset class — especially teams with $250,000+ / Year annual tech budgets who need a shared underwriting language.

Read the Investment ThesisTalk to the Team
© 2026 Golden Door Asset. Software Investing Playbook.