When a technology or SaaS acquisition is on the table, one of the first decisions an investor or acquirer faces is who should conduct the technology due diligence. Should it be handled internally — by your own technical team or a CTO in your network — or commissioned from an independent specialist?

It is a question worth thinking carefully about. The answer has a direct bearing on the quality of your findings, the speed of your process, and ultimately the confidence with which you can commit to a deal.

The Case for In-house Technology Due Diligence

There is an understandable appeal to using internal resources. It feels faster to pick up the phone to a trusted technical contact. It can feel more cost-effective. And for teams with deep sector expertise, it can seem like the most efficient path.

In some situations, internal assessments do add value — particularly as a first-pass filter at the very early stages of a process, before significant time or money has been committed. A technically strong CTO or engineering lead can quickly identify obvious red flags and help decide whether to proceed.

But relying on in-house resources for a full technology due diligence carries meaningful limitations — particularly as deal size and complexity increase.

Why External Technology Due Diligence Delivers More

1. Speed — without sacrificing depth

Experienced external TDD specialists have refined their process across dozens or hundreds of engagements. They know exactly what to look for, where to look, and how to structure the assessment to deliver actionable findings within a tight deal timeline.

An internal team conducting a TDD for the first time — or even the fifth time — will inevitably spend time working out the process as they go. An external specialist hits the ground running. At VeryDiligent, our standard engagements are delivered in 2 to 3 weeks, with accelerated assessments available in as little as one week when deal timelines require it. That speed comes from structured methodology, not shortcuts.

2. A structured, repeatable approach

External specialists bring a consistent, proven framework to every engagement. Every dimension of the target’s technology is assessed against the same criteria — architecture, code quality, security, infrastructure, engineering team maturity — ensuring nothing falls through the gaps.

Internal assessments, by contrast, often reflect the particular strengths and blind spots of the individual conducting them. A backend engineer may scrutinise the codebase thoroughly but overlook security posture. A CTO with infrastructure experience may miss the significance of high engineering team turnover. A structured external framework eliminates these gaps.

3. Benchmarking from real-world data

One of the most underappreciated advantages of working with an external TDD specialist is the ability to benchmark findings against a broad base of comparable assessments.

When VeryDiligent assesses a SaaS platform, we are not evaluating it in isolation. We are drawing on insights from our previous engagements — across sectors, deal sizes, and technology stacks. That means we can tell you not just that a target has technical debt, but whether the level of debt is typical for a company of its size and stage, or whether it represents a genuine outlier that should concern you. That context is simply not available to an internal team conducting occasional, one-off assessments.

4. Target cooperation — the independence advantage

This is perhaps the most overlooked benefit of external technology due diligence, and in practice it can be one of the most significant.

Founders and engineering teams are often reluctant to share their codebase, infrastructure details, or technical documentation with a potential acquirer’s internal team. The reasons are understandable — commercial sensitivity, concern about how findings will be used, and the inherent discomfort of having a future owner scrutinise your work.

An independent third party changes the dynamic entirely. External specialists operate under confidentiality agreements and have no stake in the commercial outcome of the deal. Targets are consistently more willing to provide full, candid access to an independent assessor than to the acquirer directly. That openness translates directly into more complete, more reliable findings.

5. Objectivity and credibility

Internal assessments are rarely truly objective. A technical advisor in your network may be reluctant to deliver findings that could complicate a deal you are enthusiastic about. An internal team may unconsciously frame findings in ways that align with the prevailing view of the transaction.

An independent external specialist has no such bias. Their job is to tell you what they find — clearly, accurately, and without regard for whether it makes the deal easier or harder. That objectivity is valuable not just for your own decision-making, but for your LP reporting, investment committee presentations, and post-close accountability.

When In-house Works — and When It Doesn’t

Internal resources can play a useful role at the earliest stages of a process — a quick sanity check before committing to full due diligence, or a first-pass review of publicly available information. They can also be valuable post-close, when integration and remediation planning requires deep ongoing involvement.

But for the core technology due diligence that informs a significant investment or acquisition decision, the limitations of internal assessment — inconsistent methodology, lack of benchmarking data, potential bias, and reduced target cooperation — make the case for independent external expertise compelling.

How VeryDiligent Can Help

At VeryDiligent, we provide independent technology due diligence for M&A, PE, and VC transactions. Our structured methodology, deep benchmarking database, and track record mean you get findings you can rely on — delivered within your deal timeline.

Contact us today to discuss your upcoming transaction.

Related reading: How Long Does a Technology Due Diligence Take? | Technology Due Diligence Report: What to Include & Why It Matters | Cybersecurity Due Diligence: The New Dealbreaker