Financial due diligence tells a PE firm what a target earns. Technology due diligence tells them what it will cost to keep earning it — and whether the platform can support the growth thesis behind the deal.
Private equity firms have gotten considerably more rigorous about financial, legal, and commercial due diligence over the past decade. Technology diligence has not kept pace at the same firms, even though an increasing share of the value in a typical mid-market deal now sits inside software, ERP systems, and the engineering teams that maintain them. We have supported diligence engagements where a target's headline growth metrics were sound but the underlying platform carried enough undocumented technical debt to materially change the post-close investment thesis — findings that a standard financial and legal review would never have surfaced.
This is not an argument for treating every deal as a full-blown enterprise architecture audit. It is an argument for a focused, proportionate technology diligence framework that surfaces the handful of issues that actually move valuation or shape the first hundred days of ownership, without turning the diligence timeline into a multi-month technical review.
The cases where technology diligence changes a deal outcome tend to follow a small number of recurring patterns. A target's core platform is more deeply dependent on a legacy, unsupported ERP or database than the management narrative suggested, meaning the growth plan implicitly requires a costly re-platforming that was never budgeted into the model. Or the engineering organization has severe key-person risk — a single founder-engineer holding undocumented knowledge of critical systems, whose departure post-close would materially disrupt operations. We have also seen deals where a meaningful share of the codebase relies on unlicensed or improperly licensed third-party software, creating a contingent liability that surfaces only after close if nobody checked.
None of these findings necessarily kill a deal. What they do is change the price, the structure, or the post-close remediation budget — which is exactly the kind of information a PE firm needs before signing, not six months after taking ownership.
A proportionate technology diligence engagement typically covers five areas. Architecture and scalability: can the current platform support the growth trajectory in the investment thesis, or does the plan implicitly assume a re-platforming effort that hasn't been priced in. Security and compliance posture: particularly critical for any target handling regulated data, where a gap discovered post-close can trigger both remediation cost and regulatory exposure. IP ownership and licensing: confirming the target actually owns, or holds properly licensed rights to, the software it is being valued on. Engineering team structure and key-person dependency: assessing whether critical knowledge is documented and distributed, or concentrated in one or two individuals. And core systems fit: whether the ERP, CRM, or operational systems underpinning the business can support a roll-up or bolt-on acquisition strategy, which is frequently central to the value creation plan itself.
This is the scope our PE consulting practice works through with investment teams during the diligence window, calibrated to the deal size and timeline — a two-week focused review for a smaller add-on acquisition looks very different from a platform investment diligence engagement, but the same five-area framework applies to both.
The real value of a good technology diligence process is not the findings memo itself; it is how directly those findings translate into an executable post-close plan. Findings should be explicitly triaged into quick wins that a new leadership team can address in the first hundred days, medium-term remediation that needs to be budgeted and staffed within the first year, and structural issues that require a longer-term platform decision aligned with the broader value creation thesis. Diligence reports that simply list risks without this prioritization tend to sit unread in a data room folder; reports built around an executable plan get used by the operating partner from day one.
This is also where continuity matters: the team that ran diligence is often best positioned to support the first months of the value creation plan, since they already understand the platform's specific weaknesses and the context behind them, rather than having a fresh team re-discover the same issues from scratch.
Technology due diligence is not about finding a reason to walk away from a deal. It is about pricing the deal accurately, structuring the right protections, and walking into the first board meeting after close with a technology roadmap the operating team already understands and trusts. Firms that treat it with the same rigor they apply to financial and legal diligence consistently report fewer unpleasant post-close surprises — and a faster start on the value creation work the deal was built around.