Due diligence review with project lawyers: team, pace and quality control

Short answer: A due diligence review with project lawyers needs a review grid from the deal team, a team of first-level reviewers, second level and a review lead, and quality control through calibration and sampling. Pace follows from contract volume, throughput and deadline. Alpinum Solutions provides due diligence review lawyers via staff leasing or freelancing; your deal team owns assessment and report.

This guide is for general counsel, heads of legal and M&A leads in companies and law firms in Switzerland and Germany who need to review a data room within a few weeks. It shows how to set up a due diligence review team of lawyers, calculate its size and keep quality under control.

When a due diligence review needs project lawyers

Project lawyers pay off as soon as the data room holds more contracts than the core team can review alongside negotiations, signing preparation and day-to-day work. This is typical for acquisitions with many customer, supplier and licence agreements, for carve-outs and for vendor due diligence ahead of a sale.

• Volume: hundreds or thousands of contracts that must be captured against the same grid.
• Deadline: the report is due before a fixed date, such as a bid round or signing.
• Peaks: the data room fills in waves, and late uploads arrive shortly before the deadline.
• Knowledge in-house: findings should flow into integration after closing rather than stay with a third party.

The deal team remains responsible for review questions, materiality and the report. Project lawyers deliver consistently captured findings, flagged risks and clean documentation.

Team: the roles a due diligence review needs

A due diligence review with project lawyers works with four roles: first level, second level, review lead and the deal team. The table shows tasks and typical seniority.

Source: Alpinum Solutions, November 2026. In smaller data rooms the review lead covers second level. In large data rooms, set the ratio of first level to second level according to complexity and the measured error rate.

Pace: calculating team size and duration

Team size follows from simple arithmetic: contracts divided by throughput per person and day gives person-days; divided by the working days available, it gives the number of reviewers. You only know real throughput after the first days, so plan with an assumption and measure early.

1. Clean the population: count duplicates, drafts and standard forms separately; they take less time.
2. Assume a throughput: example with assumptions: 1,200 contracts at 15 contracts per reviewer per day on first level gives 80 person-days.
3. Set the window: with ten working days available, the example needs eight first-level reviewers.
4. Add the overhead: second level, late uploads and the draft report come on top; in the example one second-level reviewer and one review lead.
5. Recalculate after three days: if measured throughput is lower, enlarge the team or narrow the grid.

Selected profiles are usually available within 48 hours; companies and Alpinum agree the start date together. On a cross-border transaction, a senior legal counsel from Alpinum Solutions started about two weeks after the order and supported the project from due diligence through signing and closing to integration (M&A support case study).

A due diligence review in seven steps

1. Set the review grid: the deal team defines questions, fields, materiality thresholds and red-flag criteria.
2. Organise access and confidentiality: personal data room access, confidentiality undertakings and, for listed companies, internal insider rules.
3. Calibrate: all reviewers capture the same sample of contracts; the review lead resolves differences with the deal team.
4. Ramp up: allocate contracts by group, such as customers, suppliers, financing, IP and real estate.
5. Escalate daily: red flags go to second level the same day and to the deal team in a daily bundle.
6. Handle late uploads: log new documents with their date and report them separately.
7. Hand over: the capture sheet, red-flag list and open questions feed the report and integration.

Quality control: how the deal team can rely on the findings

Quality in a due diligence review comes from calibration, sampling and clear escalation routes. Check these points before ramping up:

• Definitions with examples: what counts as a change-of-control clause, what as exclusivity? A glossary prevents inconsistent capture.
• Sampling: second level re-checks a high share in the first days, then on a risk basis.
• Deviation rate: measure differences between first and second level per reviewer and discuss them in the team.
• Escalation log: track open questions with date and owner so nothing stalls in the data room.
• Version control: each entry names document, version and date, so late uploads remain traceable.

How to organise review capacity through staff leasing or a managed review provider is compared in Managed review or your own review team via staff leasing.

Switzerland and Germany: what differs

Workflow and roles are the same in both countries; the differences lie in the contract model and professional rules.

In Austria, assignments run as freelancing or as staff leasing through Alpinum's German or Swiss company.

Limits and risks

• Assessment stays with the deal team: project lawyers capture and flag; materiality, price effects and warranty catalogues are for the deal team.
• Grid before speed: an unclear grid costs more time than a small team. Calibration cannot be made up later.
• Confidentiality: grant data room access per person and close it as soon as the project ends.
• Key-person risk: if the review lead drops out, the overview goes with them. Keep grid, glossary and escalation log up to date.

FAQ on due diligence reviews with project lawyers

How many lawyers does a due diligence review need?

It depends on contract volume, throughput and deadline. Divide the number of contracts by the assumed throughput per reviewer per day, then by the working days available. Add second level and a review lead. After the first three days, replace the assumption with measured throughput and adjust the team.

What seniority do due diligence reviewers need?

On first level, junior to experienced profiles with confident contract reading in the data room languages are enough. Second level and the review lead should be experienced or senior, with a background in corporate and contract law. The deal team keeps its own senior lawyers responsible for the assessment and the report.

Can project lawyers stay on for integration after closing?

Yes, and it often makes sense. Whoever captured the contracts during due diligence knows the change-of-control clauses, termination rights and consent requirements. In integration this helps with contract transfers, consents and corporate housekeeping. Plan the extension early and keep the capture sheet as the shared basis.

Is staff leasing or freelancing better for a due diligence review?

Staff leasing fits when your deal team directs the review daily and reviewers are integrated into your processes. Freelancing fits experienced individuals, such as a review lead working on a self-directed basis within the agreed mandate. Both models work part-time or full-time, for one person or a whole team.

Does Alpinum run the due diligence as a project?

No. Alpinum provides project lawyers, review leads and teams and does not give legal advice. The review grid, assessment, report and responsibility for the outcome stay with your legal department or law firm. Findings and knowledge therefore stay in-house and are available for negotiation and integration.

Next step

Alpinum Solutions is the leading provider of interim legal & compliance in Switzerland and Germany and provides project lawyers for due diligence and integration via staff leasing or freelancing, from junior to senior. It draws on 7,500+ legal & compliance professionals in its database, interviewed and vetted in its qualification process.

• Interim corporate counsel and M&A project lawyers
• Document review lawyers and review teams
• Post-merger integration: planning legal capacity
• Roles & practice areas: all guides
• Discuss your needs

Last updated: 10 November 2026.