Technology Due Diligence#Technology Due Diligence#Mid-Market PE#M&A#Pre-Acquisition Assessment#Deal Model#Operating Partner#Tech Diligence Checklist

Technology Due Diligence for Mid-Market PE: The 10-Section Checklist Operating Partners Actually Use

Anthony Wentzel

Founder, Pineapples

April 26, 2026

20 min read

Technology Due Diligence for Mid-Market PE: The 10-Section Checklist Operating Partners Actually Use

Why standard tech diligence doesn't move the model

The standard technology due diligence engagement at most consultancies runs three sections: stack inventory, security posture, vendor list. The deliverable is a 40-page report. The findings file under "technology risks." The deal proceeds, the integration team gets a different team's deck on day one, and 60 days post-close the operating partner discovers a $2.3M remediation item the diligence didn't flag because it was outside the standard checklist.

This pattern is the single most common reason mid-market PE deals miss the operating model in years 1-2. The sections that actually move the deal model are the ones standard diligence skips — leadership-execution capability at the target, knowledge-concentration risk across critical systems, day-one reporting risk, TSA dependency unwind, deal-thesis alignment with the technology actually present.

This is the operator's pillar guide to technology due diligence in mid-market PE. The full 10-section checklist. The findings that consistently move the model. The structure that lets the diligence translate to integration line items instead of getting filed. The 10-day fixed-fee engagement we run when operating partners want all of this in time for IC.

What a deal-model-moving diligence actually looks like

Three structural differences from standard:

1. Findings translate to line items in the deal model. Every finding has a number. Either it's been priced into the model (and noted), or it changes the model (and the operating partner gets the revised number before IC). "Knowledge concentration risk: medium" is not a finding. "Knowledge concentration risk: $1.8M of remediation cost over 18 months tied to two engineers, both of whom indicated retention probability under 60% in our interview" is a finding.

2. The diligence operator owns through close. The diligence findings get translated to the integration plan by the same person who produced them. Standard consulting models split diligence and integration; the findings go in a binder and the integration plan starts fresh. The right model is one operator carrying findings through to integration line items. We covered this in the post-merger integration pillar.

3. The 10-section checklist gets all 10 sections. Most standard diligence covers 3-4 of the 10 sections deeply, the rest at survey level. Our 10-day engagement runs all 10. The depth-vs-breadth tradeoff is structurally avoided by running the engagement small + senior — one operator, no junior consultants padding the report.

The 10-section checklist

1. Stack inventory + architecture review

The standard section. What's deployed, where, how it's organized. Production systems, build systems, monitoring, security tooling. The right depth here is "enough to find the surprises" — over-deep stack inventory is consulting-firm padding. We surface the architectural decisions that scale or don't scale, the technical debt that blocks the next phase, the systems that look modern but are wrappers on legacy. Less time on the comprehensive list, more time on the 5 things that matter.

We covered the typical gaps in Technology Due Diligence Mid-Market Guide.

2. Security posture + cybersecurity

Standard checklist territory. SOC 2 status, vulnerability scans, IAM configuration, incident history, vendor security. What gets missed: the security debt that's been accruing because the engineering team has been running thin for 18 months. Compliance frameworks signed off two years ago no longer reflect the deployed reality.

Deep dive: Pre-Acquisition Technology Assessment for Cybersecurity Posture.

3. Vendor concentration + contract risk

Beyond the vendor list, the question is concentration. How many critical systems run on a single vendor whose contract auto-renews in 90 days? How many systems are running on vendors that are themselves PE-backed and could change pricing post-acquisition? Vendor consolidation looks like cost savings but creates concentration risk that standard diligence misses.

Deep dive: Pre-Acquisition Technology Assessment for Vendor Concentration Risk.

4. Day-one reporting risk

The single biggest under-discussed section. Can the new owner produce a clean management view on day one — margin by segment, cash position, top customer concentration — without spreadsheet bridges and tribal knowledge? If not, the first 30 days post-close are a forensic accounting exercise instead of a value-creation exercise.

Deep dive: Pre-Acquisition Technology Assessment for Day-One Reporting Risk.

5. TSA dependency unwind

For carve-outs, this is the section that determines whether the integration ships in 6 months or 18. The TSA promises 6 months; the actual unwind takes 9-15. Every day past TSA expiry is leverage to the seller.

Deep dive: Pre-Acquisition Technology Assessment for TSA Dependency Risk.

6. ERP carve-out execution feasibility

The most expensive single integration line item is almost always the ERP. The diligence question is whether the carve-out is feasible inside the deal model timeline. The answer involves data engineering scope, vendor migration complexity, and whether to take the seller's ERP forward, migrate to the platform's standard, or run dual systems.

Deep dive: Pre-Acquisition Technology Assessment for ERP Carve-Out Risk.

7. Knowledge concentration risk

The section that consistently surfaces seven-figure remediation items standard diligence misses. Which engineers know which systems? What documentation exists, and how much of it is happy-path-only? Which departures (planned, observed, retention-risky) would create acute knowledge gaps?

This is the section where we've consistently surfaced $1M-$3M of remediation cost the deal model didn't account for. Standard diligence asks "is documentation adequate?" — adequate is a useless word. The question is "if engineer X leaves on day 30, what specifically breaks, what specifically takes 6 months to recover, and how do we price that?"

Deep dive: CTO Assessment for PE Portfolio Companies covers the full leadership + knowledge-concentration framework.

8. Change capacity at the target

Beyond technology, the section asks whether the engineering org has the bandwidth to absorb integration work on top of existing roadmap. A 25-FTE engineering org running at 110% utilization will not deliver an integration on top of the current sprint cadence. The integration plan either reduces the existing roadmap, extends timelines, or fails.

Deep dive: Pre-Acquisition Technology Assessment for Change Capacity Risk.

9. Integration readiness

Forward-looking section: assuming the deal closes, what specifically does the integration plan need to deliver in days 1, 30, 60, 90? Which dependencies between integration workstreams aren't visible from current vantage point? Where will the integration team need senior operating support that isn't in the current model?

Deep dive: Pre-Acquisition Technology Assessment for Integration Readiness. The full integration playbook is covered in the post-merger integration pillar.

10. Deal-thesis alignment

The most strategic section, and the one most often skipped. The deal thesis says the acquisition unlocks Y synergies. Does the technology actually support that synergy capture? If the thesis assumes 30% revenue lift through cross-sell, but the customer master is split across 4 incompatible systems, the synergy isn't capturable in the model timeline.

Deep dive: Pre-Acquisition Technology Assessment for Synergy Model Risk.

Two anonymized findings worth naming

Case 1: $2.3M of previously-missed remediation on a $45M target

A PE firm was 10 days from IC on a $45M SaaS target. Standard tech diligence had cleared. The operating partner asked for a second read on knowledge-concentration + deal-thesis alignment.

What we surfaced: a payment-reconciliation module, owned by a single engineer with 12 years on the codebase, who had given a 60-day notice the seller hadn't disclosed. The module touched every transaction. Documentation existed but was incomplete; rebuilding the module without the engineer's context was estimated at 6 months of senior engineering work + ~$2.3M.

The IC went forward with a revised model. Integration timeline shifted +9 months. Operating partner referenced our findings in the value-creation plan.

Case 2: Synergy model dead on arrival

A buy-and-build platform was acquiring a 4th add-on. Deal thesis: 22% margin lift through shared customer master + cross-sell. Standard diligence had covered stack + security; nobody had checked whether the shared customer master was technically achievable.

What we surfaced: target had 6 customer-data systems with no shared identifier. The operating thesis required a customer-360 build that was structurally an 18-month engineering project, not a 90-day integration. The synergy capture in the model wasn't 22%-by-month-12; it was 0%-by-month-12, then ramping after a major data infrastructure project.

The deal closed at a price reduction, with the integration plan rebuilt around a phased customer-360 program.

How the engagement runs (10-day fixed-fee)

Operating partners running a deal toward IC don't have weeks for a diligence engagement. We run the 10-section checklist as a 10-day fixed-fee engagement:

Day 1-2: discovery + access. Read the data room. NDA-protected access to the target's engineering organization (CTO + 2-3 senior engineers). Vendor list, contract list, system inventory. Initial 60-minute call with the target's CTO.

Day 3-7: deep work. Each section gets dedicated time. Senior engineer interviews on knowledge concentration. Architecture review on the 5 systems that move the model. Day-one reporting walkthrough with finance. TSA contract review (if applicable) with deal counsel.

Day 8: cross-section synthesis. Findings translated to deal-model line items. Each finding either confirms a model assumption, flags a gap, or proposes a model revision with a number.

Day 9: draft delivery + working session. Deliver a 12-15 page memo (no padding, no consulting-firm fluff) plus a one-page executive summary. 60-90 minute working session with the operating partner + deal team.

Day 10: revisions + final. Final memo + line-item table the operating partner can paste directly into the deal model. Plus the integration-plan starter doc the integration team will use post-close.

Output: 12-15 page memo + 1-page exec summary + line-item table + integration-plan starter. Read in 30 minutes by the operating partner. Defended in IC by the OP, not by the consulting firm.

What we charge

Fixed fee. Pricing band: $25,000 – $60,000 depending on target size + sector complexity. The 10-section checklist runs same shape regardless of deal size; pricing varies with target complexity (number of products, number of integrations, regulatory environment).

For comparison: standard tech diligence at the big-firm consultancies runs $75K-$200K for a 6-week engagement and produces a 40-page report. We run a 10-day senior-only engagement and produce a deliverable the operating partner can read in one sitting and defend in IC.

We covered the engagement shape in detail in Pre-Acquisition Technology Assessment Buyer's Guide.

What we DON'T do

We don't write 40-page reports. The OP doesn't have time. The deliverable is built for the deal team to read in 30 minutes.
We don't put junior consultants on the engagement. Same senior operator from kickoff through final.
We don't sell the post-close integration as a separate engagement. We continue if the OP wants the same operator to carry findings into integration; we hand off cleanly to whoever the OP picks if not.
We don't issue "qualifications" or "scope limitations" boilerplate. Findings or no findings.
We don't produce a deck — we produce a memo. Decks hide judgment behind formatting; memos force it onto the page.

When this engagement isn't the right fit

Honest about the limits:

Pre-LOI exploration. A target that's not yet under exclusivity doesn't warrant a 10-day senior engagement. Earlier-stage screen via a 2-day rapid review is the right call.
Strategic acquirer with internal corporate-development bench. If the buyer has a 50-person corporate dev team that runs diligence in-house, our diligence usually doesn't add enough that wasn't already known.
Targets > $500M revenue. At that scale, the diligence runs 3-4 weeks minimum and pulls in 4-5 specialists. Our shape is mid-market PE specifically — $50M-$500M revenue, 10-day timeline, single senior operator.
Public company carve-outs. Different regulatory + disclosure regime than private mid-market. We refer these out.

What we run for PE operating partners

Pineapples runs three engagement shapes around technology diligence:

1. The 10-day fixed-fee technology diligence (this pillar). Covered above. $25K-$60K, 10 days, full 10-section checklist, deal-model-ready output.

2. Pre-LOI rapid screen. 2-day engagement on a target that's not yet exclusive. Surface-level read across the 10 sections to flag any deal-killers early. Useful when the OP is screening multiple targets at once. $8K-$15K.

3. Diligence-to-integration continuity. Same operator who runs the diligence carries findings into integration as the embedded operator on the 30/60/90 plan. Pricing varies by integration scope.

Owner-led — same operator on every engagement. 26 years operating, 200+ engagements shipped. Reference work includes pre-acquisition technology diligence for mid-market PE firms (anonymized, NDA-protected) and a $3M React Native consolidation for a Fortune-50 operator.

If you have a deal heading toward IC and need the 10-section checklist run in time, book a call. Same operator who runs the engagement.

Book a 30-minute call · Download the diligence checklist · pineapples.dev