Should we standardize on one ATS or let each acquired firm keep its own?

Standardize, but not on day one. Pick the platform that already handles your largest revenue segment and has the cleanest data. Then migrate the smaller firms in waves over 6 to 12 months. Letting every firm keep its own ATS feels kind, but it costs you shared reporting, cross-selling, and any real synergy. You cannot manage margin across five systems that do not talk to each other.

How long does a proper post-acquisition tech audit actually take?

The audit itself takes 90 days if you run it in three 30-day phases: inventory and access in month one, data and integration mapping in month two, decisions and roadmap in month three. The migration that follows takes longer. Do not confuse the two. The audit tells you what to do. The rollout is a separate project with its own timeline and budget.

What is the biggest mistake operating partners make in the first 90 days?

Waiting. They spend the first quarter on people and org charts and treat technology as a later problem. By the time they look, three months of data has piled up in incompatible systems, and the cleanup cost doubles. Start the tech audit in week one, in parallel with everything else. The systems are where your synergy math lives or dies.

Post-Acquisition Tech Stack Audit for Staffing Roll-Ups

Q1 2026 is delivering the most staffing M&A since 2022, and operating partners are inheriting a mess of incompatible systems. Here is the 90-day audit sequence that separates margin expansion from integration drag.

Q1 2026 is on pace to deliver the highest staffing M&A deal volume since 2022. PE firms are running aggressive buy-and-build plays, stacking three, four, five staffing firms into a single platform. The deal models promise margin expansion. The reality inside the portfolio looks different.

You inherit two ATS platforms, three payroll systems, a back-office tool nobody has patched in two years, and a founder who swears his spreadsheet is better than any software you could buy. The synergy numbers in the investment memo assume all of this talks to each other. It does not.

The first 90 days decide whether you capture the margin or spend the next two years untangling systems. Here is the audit sequence that gets you there.

Why the tech stack is where synergy dies

The financial model says the combined firm shares back-office costs, cross-sells clients, and reports on one dashboard. Every one of those assumptions depends on systems that connect.

When they do not connect, you get real costs that never show up in the memo. Two teams keying the same data twice. A CFO who cannot close the month because payroll lives in three places. A sales leader who cannot see which clients overlap across the acquired firms. These are not small frictions. They are the difference between a platform that scales and a holding company that just happens to own five staffing firms.

The audit is not an IT exercise. It is a margin exercise. Treat it that way and you will get the attention it needs from the operating team.

The 90-day sequence, in three phases

Run this in three 30-day blocks. Do not skip ahead. Each phase feeds the next.

Days 1 to 30: Inventory and access

You cannot fix what you cannot see. Start by writing down every system every acquired firm uses to run the business. Not the ones on the org chart. The ones people actually open.

ATS and CRM. Which platform, which version, how many seats, and who administers it.
Payroll and back office. Pay/bill, invoicing, timekeeping, and the general ledger.
Point tools. Job boards, texting apps, scheduling tools, and the spreadsheets running critical processes.
Contracts. Renewal dates, auto-renew clauses, and per-seat costs.

Then get admin access to all of it. This sounds basic. It is the step people skip, and it is the one that bites you in month three when a founder leaves and takes the only login with him. Secure access to every system in the first 30 days, in writing, before the goodwill from the deal wears off.

Days 31 to 60: Data and integration mapping

Now you look at how the systems connect, or fail to. This is where the real cost hides.

Map every place data moves between two systems. If it moves by hand, flag it. Manual data entry between an ATS and a payroll system is both a cost and a risk. Someone will fat-finger a pay rate and you will find out when a contractor complains.

Check data quality while you are in there. Duplicate candidate records, missing client fields, and mismatched status codes will wreck any migration you attempt later. Better to know now. Pull a sample of 200 records from each ATS and score them for completeness. If more than a quarter have holes, your migration timeline just got longer.

This is also where you see whether AI and automation are even possible. You cannot automate on top of a broken data foundation. If the acquired firms are sitting on dirty data across incompatible systems, that is your first project, not chatbots.

Days 61 to 90: Decisions and roadmap

By now you know what you have and how it connects. Time to decide.

Pick the platform of record for each function. One ATS. One payroll system. One CRM. Choose based on which system already carries the most revenue and the cleanest data, not which founder shouts loudest. Write the decision down and name the owner.

Then sequence the migration. Do not move everyone at once. Move the smallest, cleanest firm first as your proof of concept. Learn from it. Then move the rest in waves. A phased rollout over 6 to 12 months beats a big-bang cutover that takes the whole platform offline for a week.

End the 90 days with three things on paper: the target stack, the migration sequence with dates, and the dollar figure attached to each move. That last one keeps the deal team honest about what synergy actually costs to capture.

The mistakes that cost you the quarter

Two patterns show up in almost every roll-up that stalls.

First, waiting. Operating partners spend the first quarter on people and org design and push tech to later. By the time they look, three more months of data has piled up in systems that do not connect, and the cleanup cost doubles. Start the audit in week one, in parallel with everything else.

Second, keeping everything to avoid a fight. Letting each firm keep its own ATS feels like the path of least resistance. It is the most expensive choice you can make. You lose shared reporting, you lose cross-sell visibility, and you lose the margin the deal was built on. Standardize. It is the whole point of buying more than one firm.

Change is hard on the people running these firms. They built processes around their tools and they are watching you take them away. That resistance is real and you have to manage it, not steamroll it. But the answer is a clear plan and honest communication, not five permanent systems.

Your move this week

Pick your largest acquired firm and get admin access to its ATS and payroll system by Friday. Not read-only. Full admin. That single step tells you how much control you actually have and surfaces the access gaps that would otherwise ambush you in month three. If you cannot get in, you just found your first real problem, and better this week than next quarter.

The Post-Acquisition Tech Stack Audit: What PE-Backed Staffing Roll-Ups Must Standardize in the First 90 Days