The 90-Day Tech Stack Triage for PE-Backed Staffing Portfolios After a Close

Q1 2026 closed with 35 staffing M&A deals, the busiest opening quarter in three years. If you run ops for a PE-backed portfolio, that number is not a headline. It is your to-do list.

Here is what you actually inherited on close day. Two ATS platforms running side by side. Candidate data split across systems that do not talk to each other. Recruiters on the acquired side wondering if their desk is about to change or disappear. And a board deck that expects synergy numbers by the end of the quarter.

You cannot fix all of that at once. Teams that try end up breaking billing and losing their best recruiters in the same month. What works is a sequenced triage. Fix the right things in the right order over 90 days. Here is the playbook.

Days 1 to 30: Stabilize and map, do not migrate

The first month is not for building. It is for knowing what you have. Most portfolio leaders skip this and jump straight to picking a platform. That is how you pick wrong.

Start with a hard freeze on anything that touches billing. The acquired firm keeps invoicing exactly the way it did before close. No new tools, no data moves, no workflow changes on the revenue path. Protect the money first.

Then map both stacks. You need a plain inventory of every system in play across both firms.

• ATS and CRM. Which platform, how many active reqs, how many placed candidates in the last 12 months.
• Payroll and back office. Who runs it, on what cadence, and what breaks if it moves.
• VMS and job board connections. These integrations are quiet until they fail. List every one.
• Reporting. How each firm counts a submittal, an interview, and a placement. These definitions almost never match.

That last point matters more than people expect. If the acquired firm counts a submittal at first contact and you count it at client send, your combined dashboard is fiction. Fix the definitions before you fix the systems.

By day 30 you should have one document that shows both stacks, the revenue-critical workflows, and where the data lives. No decisions yet. Just the truth on paper.

Days 31 to 60: Pick the platform and clean the data

Now you decide. Pick the ATS that carries more of your revenue-critical workflow, not the one with the nicer interface. The winning platform is usually the one with cleaner data, more active integrations, and the recruiters who bill the most.

Once you pick, tell everyone. The acquired team has been waiting to hear if their system survives. Say it plainly. Name the platform, name the timeline, and name the person they call with questions. Silence in this window is where good recruiters start taking calls from competitors.

Then clean the data before it moves. Migration multiplies whatever mess you feed it. Dirty data in the source becomes dirty data in the destination, times two.

• Dedupe candidate records across both systems. Match on email and phone, not name.
• Standardize status labels so an active candidate means the same thing everywhere.
• Flag the records that actually matter. You do not need to migrate a resume from 2019 that never got placed.
• Confirm ownership. Every migrated record needs a recruiter or a pool it belongs to.

This is also where AI earns its slot. Use it to match duplicates, normalize job titles, and flag stale records at a speed no team can hit by hand. It will not replace your judgment on which platform wins. It will save you three weeks of manual cleanup. That is the right way to use these tools during an integration.

End the second month with a chosen platform, a clean data set staged for migration, and a team that knows the plan.

Days 61 to 90: Migrate one system at a time, then prove it

Do not move everything in one weekend. Sequence it. Migrate the ATS first because it carries placement and billing. Prove it works before you touch the next system.

Run the new platform in parallel for at least two weeks. Recruiters keep their old system live while the new one gets tested against real reqs. You are checking three things: does billing calculate right, do integrations fire, and can a recruiter run a full desk without a workaround.

Keep a rollback plan the entire time. If billing breaks, you go back to the source system same day, no debate. Rollback is not failure. It is the reason you can migrate at all without gambling the revenue.

Once the ATS holds, move the next system. Then the next. One at a time, each with its own parallel window and its own rollback. This feels slow. It is faster than the rip-and-replace that breaks payroll in week two and eats your next 60 days in cleanup.

Through all of it, keep the acquired recruiters informed. One weekly update. What moved, what is next, what stays the same. People adopt change they can see coming. They fight change that gets sprung on them. Getting the new stack adopted is a people problem as much as a tech one.

The metric that tells you it worked

You will be tempted to measure success by how many systems you shut down. Wrong metric. Measure time-to-fill and placement volume on the acquired desks, week over week, through the whole 90 days.

If those numbers hold steady or climb during the migration, the triage worked. If they drop, you moved too fast or you lost the recruiters' trust. The tech stack is not the point. Billable production is the point. The stack just has to stop getting in the way of it.

Do this week: Build the one-page stack inventory for both firms. List every system, every revenue-critical workflow, and how each side defines a submittal, an interview, and a placement. You cannot sequence a migration you have not mapped. That single document is the difference between a clean 90 days and a broken one.