James Whitfield
Last Black Friday, one of our customers saw their order volume jump from eight hundred to thirty-two hundred per day. Overnight. They were ready for it and everything went smoothly. Another customer went from two hundred to six hundred orders and their entire fulfillment process collapsed. Labels were not printing. Carrier APIs were timing out. Their support inbox exploded.
The difference was not company size. It was preparation.
Black Friday is three weeks out. Cyber Monday follows immediately. Then the holiday rush continues through mid-December. If your shipping setup can handle your normal Tuesday volume but you have not stress-tested it for three to four times that load, now is the time to fix things. Not next week. Now.
Start with the bottlenecks you already have
Before adding anything new, look at where things slow down today. Seriously - time your current process.
How long does it take to generate a hundred labels? Five hundred? What happens when a carrier API responds slowly or starts returning errors? Can your warehouse print labels faster than your packers can actually pack? How quickly can your team switch to a backup carrier if the primary one stops accepting pickups?
If you do not know the answers, run a simulation this week. Generate a realistic batch of test orders and push them through your entire pipeline from order creation to label printing. The problems you discover at five hundred test orders are exactly the same ones that will hit you at three thousand real orders - except right now you have time to fix them.
I remember running one of these simulations with a client last October. Everything seemed fine until we hit the three hundred order mark and discovered their label generation was calling the carrier API synchronously, one at a time. At normal volume nobody noticed the delay. At peak volume it would have taken over four hours to print a single morning batch. We caught it with two weeks to spare. That is the kind of thing you find only by testing.
Pre-generate labels before the rush hits
This is the single most impactful thing you can do. Do not wait until Black Friday morning to generate labels for orders that came in overnight.
Set up a process that runs at midnight - or whenever your order cutoff time is - and pre-generates labels for every confirmed order. By the time your warehouse team arrives at six in the morning, every label is already printed and sorted by zone. Nobody is waiting. Nobody is watching a progress bar.
The way this works with UniShip is straightforward. You submit a batch of orders to our Shipment API with automatic carrier selection enabled. You specify your strategy - cheapest option, fastest option, or cheapest within a delivery window - and the system picks the right carrier for each shipment without any human decision-making at two in the morning. Labels come back in whatever format your printers need.
For details on setting up the printing side of batch operations, have a look at our post on warehouse label printing automation.
Set up carrier fallbacks
This is the one people forget until it is too late. During peak season, carriers hit capacity. DHL might stop accepting new pickups in certain regions. DPD might have a system outage for a couple of hours. InPost lockers fill up in popular neighborhoods.
You need automatic fallbacks. Here is how I recommend structuring them.
Your primary carrier handles eighty to ninety percent of volume at your negotiated rates. This is your workhorse. Your secondary carrier is slightly more expensive but reliable. It kicks in automatically when the primary is unavailable or over capacity. Then you have an emergency carrier - the "just get it there" option. Might cost more, but it means orders still ship the same day.
In UniShip, you configure this as a carrier priority chain in your account settings. If shipment creation fails with the primary carrier, the system automatically retries with the next carrier in the chain. No code changes needed. No manual intervention. Your warehouse team might not even notice the switchover happened. They just see labels printing as usual.
I had a client last year whose primary carrier went down for two hours on Cyber Monday. Their fallback kicked in automatically and they did not lose a single shipment. They only found out about the outage when I mentioned it to them the following week. That is how fallbacks should work - invisible until you check the logs.
Batch operations are non-negotiable
If you are still creating shipments and printing labels one at a time through individual API calls, peak season will eat you alive. The overhead of individual requests, connection setup, and response processing adds up fast when you multiply it by thousands.
Our batch endpoints accept up to five hundred shipments per request. For a customer processing three thousand orders, that is six API calls instead of three thousand. The difference in total processing time is roughly eight times faster for batch versus sequential calls. We have measured this across multiple customers and the improvement is consistent.
During normal operations, the difference between batch and sequential might not feel urgent. During peak season, it is the difference between your warehouse team starting on time and starting two hours late. Those two hours cascade through the entire day.
Monitor everything during peak week
You cannot fix what you cannot see. During Black Friday week, you should be watching several key metrics in real time.
Shipments created per hour lets you spot volume spikes early. Carrier error rates help you catch outages before they cascade into bigger problems. Label generation latency tells you if your warehouse is about to slow down. And carrier pickup capacity - some carriers publish limits - warns you when it is time to redistribute volume.
Our Tracking API gives you real-time status updates for all shipments across all carriers. Set up alerts for unusual patterns. A sudden spike in "label created but not picked up" shipments might mean your carrier missed a scheduled pickup. You want to know about that within minutes, not the next morning.
The pre-peak checklist
Here is the condensed version. I suggest printing this out and working through it over the next two weeks.
During the first week - which is now - run a load test at three times your normal daily volume. Configure your carrier fallback chains. Test batch label generation end to end, from order creation through to physical printing. Check your thermal printer supplies - label rolls and ribbons - and order extras today, not on November twenty-fourth. And confirm pickup schedules with all your carriers for Black Friday week.
During the second week, set up pre-generation scheduled jobs for overnight label creation. Build a monitoring dashboard or verify your existing alerts are working. Brief your warehouse team on what happens when a carrier fallback activates. Test the full pipeline one more time under load. And make sure your emergency carrier account is actually activated and tested - not just "we signed a contract." I have seen teams discover on Black Friday morning that their backup carrier account was never fully provisioned. That is not a fun discovery.
During Black Friday week itself, run your pre-generation jobs with expanded time windows because orders will keep coming later than usual. Staff additional warehouse shifts if your volume projections warrant it. Keep our status page bookmarked because we post real-time carrier status updates there. And try to breathe. Your system is ready.
One more thing
Talk to your carriers now. Not next week. Now. Ask them about pickup capacity for Black Friday week, cutoff times for same-day handover, and whether they are imposing volume surcharges. Some carriers add peak season surcharges of fifty cents to a euro fifty per parcel. It is better to know this before you set your free shipping threshold than after.
Peak season rewards preparation and punishes improvisation. Every year I see the same story play out. The merchants who treat shipping as infrastructure - tested, monitored, and redundant - are the ones whose customers get their packages on time and come back for more. The merchants who wing it spend Black Friday in firefighting mode and the rest of December apologizing.
Do not be the second group. You have three weeks. That is plenty of time if you start today.