Tired of chasing signatures by email? Approval workflow automation replaces that chase with rules: a request is submitted, routed to the right approver, reminded, escalated if ignored, and recorded.
| Building block | What it does |
|---|---|
| Parallel split (AND gateway) | Sends a request to two or more approvers at once |
| Parallel join | Waits for every incoming branch before moving on |
| Exclusive gateway | Picks one path when a single decision is mandatory |
| Non-interrupting timer | Starts an escalation task alongside the open approval |
| Event-based wait | Waits for one approval message or one timer, whichever comes first |
These behaviours come from the Camunda workflow patterns documentation and the UiPath Maestro flow and routing guide. Product documentation changes, so check the source before you rely on the details.
What an automated approval workflow actually is
An approval workflow is a repeatable path a request follows until someone says yes or no. Typical requests are purchase orders, expense claims, leave requests, contract sign-offs and document reviews.
Done by hand, the path lives in people’s inboxes. Automated, it lives in a model that a workflow engine runs, so every request follows the same rules and leaves the same record.
If you are new to the wider topic, our overview of workflow automation explains the general ideas that approvals build on.
Step by step: how an approval is automated
Most automated approvals share the same skeleton. You can build it on a code-first engine or on a visual tool, and the steps stay the same.
- Capture the request. A form collects the fields the rules will need: amount, department, requester, category and attachments.
- Validate it. Missing or inconsistent data is bounced back to the requester before any approver sees it.
- Route it. Rules decide who approves, based on attributes such as amount, department or risk.
- Assign a task. The approver receives a task with approve and reject options, plus a field for comments.
- Remind and escalate. Timers nudge a slow approver and then bring in someone else.
- Act on the outcome. An approval triggers the next action, such as issuing the purchase order. A rejection returns to the requester with the reason.
- Record everything. Who decided, when, and with what comment is stored for later audit.
Each step is small. The value comes from running them the same way every time, without anyone remembering to do it.
Routing rules: deciding who approves
Routing is the heart of approval workflow automation. A rule reads the request data and picks a path.
In BPMN-style tools this decision is an exclusive gateway. The UiPath guide describes the pattern as one to use when “A single decision is mandatory.”
Common routing rules look like this:
- By amount: small spend goes to a line manager, large spend adds a finance approver.
- By department or cost centre: the budget owner approves.
- By category: legal reviews contracts, IT reviews software.
- By requester: a manager’s own request goes to their manager.
Write the thresholds in an approval matrix before you build anything. A one-page table of request type, limit and approver saves many arguments later.
Sequential, parallel and conditional approvals
Once you know who approves, decide in what order. There are three shapes, and real processes mix them.
Sequential
One approver after another, such as manager, then finance, then director. It is simple and easy to audit, but slow, because each person waits for the one before.
Parallel
Several approvers review at the same time. Camunda’s pattern page cites Workflow Pattern 2 for the parallel split: “The divergence of a branch into two or more parallel branches each of which execute concurrently”. In BPMN this is a parallel (AND) gateway, and a matching join waits for all branches.
A join needs every branch to arrive. If one path never reaches it, the process waits forever, so design the join and its incoming flows together.
Conditional
An extra approver is added only when a condition holds, for example spend above a limit. Model the condition on an exclusive decision, then merge the paths again afterwards.
For concrete cases, see these workflow automation examples, which show how such flows appear in everyday processes.
Reminders, escalation and timeouts
Approvals stall because people are busy, not because they refuse. Timers fix that without anyone chasing.
Camunda’s documentation explains that boundary events can be interrupting or non-interrupting. It gives the example of a timer that is non-interrupting: the “Escalate request approval task is started in parallel, additionally to the Approve request task.”
That choice matters. A non-interrupting timer keeps the original approver’s task open while a manager is alerted, so the first approver can still act.
For a “whichever comes first” rule, the UiPath guide models a send task that requests approval, then waits on a message event “Approval received” or a timer event “Seven days elapsed.” Its note reads: “Keep exactly one message and one timer attached to the gateway.”
Decide up front what a timeout means. It can escalate to a deputy, auto-reject, or, only where policy truly allows it, auto-approve.
Audit trail, testing and no-code options
An automated approval is only trustworthy if you can show what happened. Store each decision with the approver, the time, the comment and the version of the rules in force.
Before launch, replay a batch of past requests through the new rules and compare the results with what approvers actually decided. Differences point to rules that are wrong or to old habits that were never written down.
After launch, watch a few measures:
- How long requests wait at each step.
- How often escalation fires.
- How often someone overrides the rules by hand.
You do not need to write code for any of this. A no-code workflow automation tool can express the same routing, parallel and timer building blocks through forms and drag-and-drop diagrams.
Whatever tool you choose, keep the process simple first. Automate the common path, then add exceptions only when real requests show you need them.
Common mistakes to avoid
- Automating a broken process. Fix needless approval layers first, because automation makes a bad process faster, not better.
- Hard-coding approvers. Route to roles, not named people, so holidays and job changes do not stall requests.
- No exit for stuck requests. Every wait needs a timer or an owner who can intervene.
- Unclear rejection. Require a reason, so the requester can fix and resubmit.
- Skipping the delegate path. Allow approvers to delegate, and log it.
Frequently asked questions
What is approval workflow automation?
It is the use of software rules to route a request to approvers, track the decision and trigger the next action, instead of passing it around by email.
Should approvals be sequential or parallel?
Use sequential when a later approver depends on an earlier one’s decision. Use parallel when reviews are independent, because it shortens the wait.
What happens if an approver does not respond?
A timer can remind them, then escalate to another person. Camunda’s documentation shows a non-interrupting timer that starts an escalation task while the original task stays open.
Do I need to code to automate approvals?
Not necessarily. Visual and form-based tools can build routing, parallel approvals and timers without code, though complex integrations may still need a developer.
