Software customized to your business and Paychex Flex.

Describe the app you need. Our AI engineers build it around 100% of your workflow, connect it to Paychex Flex and keep it running. Typically ready to test in 1–2 weeks.

Book a demo

No developers needed. Free test version before you commit.

Name	Starts	Status
M. Alvarez	Oct 27	Ready
J. Brooks	Nov 3	Laptop pending
P. Singh	Nov 3	Paperwork
T. Nguyen	Nov 10	Offer signed

Yes, you can get custom software that connects with Paychex Flex.

Yes. Mercovano builds custom business software that connects directly to Paychex Flex through Paychex's REST API. Our AI engineers design it around how your team works, and it reads and writes Paychex Flex data such as employees, departments, time off.

Paychex FlexPaychex · HR & payroll

Reads and writes

EmployeesDepartmentsTime offTimesheetsPay runsJob titles

Your appsApprovals · rules · forms

Apps you can build on Paychex Flex.

Each one is its own app, built around your rules and connected to Paychex Flex, so nothing is typed twice.

Name	Starts	Status
M. Alvarez	Oct 27	Ready
J. Brooks	Nov 3	Laptop pending
P. Singh	Nov 3	Paperwork
T. Nguyen	Nov 10	Offer signed

Employee	Dates	Status
J. Brooks	Nov 24–28	Approved
P. Singh	Dec 22–Jan 2	Cover needed
M. Ito	Nov 7	Manager review
A. Diaz	Dec 1	Approved

Employee	Expires	Status
A. Diaz · First aid	Mar 2027	Current
R. Cole · Forklift	Nov 18	Renew soon
T. Nguyen · Privacy	—	Assigned
L. Byrne · Safety	Oct 1	Expired

Policy	Signed	Status
Code of conduct	212 / 220	8 pending
Data privacy	220 / 220	Complete
Expense policy	180 / 220	Due Nov 15
Remote work	96 / 220	Due Dec 1

How it connects to Paychex Flex.

Vendor: Paychex
Category: HR & payroll
Connection: Direct API, no middleman
API type: REST
Access: Your Paychex Flex admin turns on API access, and we give them the exact steps.
Real-time updates: Yes. Changes in Paychex Flex can trigger your automations straight away.
Writing back to Paychex Flex: Partial. Key records can be written back; the rest are read.
File import fallback: Yes. Paychex Flex accepts import files, which we use as a fallback.
API documentation: Paychex developer docs ↗

From a description to a working app.

01
Describe the app you need
In your own words: how the work runs today, who approves what, and which systems it touches. Click through a first version and change anything.
02
We build it and connect your systems
Our AI engineers build it on your data. Your admin grants access to your systems, with exact steps from us; we do the rest.
03
Test, launch and improve
Test it free on your own data before you commit; typical apps are ready to test in 1–2 weeks. When your process changes, the app changes with it.

No developers on your side. Just someone who knows how the work gets done.

See how it works in detail →

100% your workflow

Your steps, approvals and policies, not Paychex Flex's defaults.

Connected to Paychex Flex

Approved work lands in Paychex Flex without anyone re-typing it.

One platform, many apps

Every app shares the same Paychex Flex connection, sign-in and roles. Add the next one when you need it.

Paychex Flex and Mercovano, answered.

Can I get custom software that connects with Paychex Flex?

What apps can I build on Paychex Flex?

Teams build employee onboarding, time-off requests, timesheets, training and certifications, policy sign-offs and shift scheduling on Paychex Flex, each with their own approval rules, forms and policies. If you can describe the process, we can build it.

How does the software connect to Paychex Flex?

Your Paychex Flex admin turns on API access, and we give them the exact steps. The connection uses Paychex Flex's REST API.

Do I need a developer or IT team?

No. Our AI engineers build, connect, host and maintain your apps. You describe how the work runs today and test it on your own data.

How long does it take?

Typical projects are built and ready to test within 1–2 weeks of going ahead.

How is it priced?

You pay for the software you need, nothing more: no per-user pricing and no implementation fees.