Approval Workflow: Automate Decisions & Governance

TL;DR — An approval workflow is a structured process that routes tasks, documents, or decisions through a defined sequence of human or automated reviews and authorizations before they can proceed. It ensures compliance, transparency, and accountability.

Manual approval processes are a common source of organizational friction, leading to delays, lost requests, and a frustrating “email ping-pong” that slows down critical operations. Whether it’s a new software release, a financial transaction, or a marketing campaign, the need for human review and sign-off is often unavoidable.

However, the process itself doesn’t have to be manual. By formalizing these decision points into automated approval workflows, organizations can eliminate bottlenecks, enhance transparency, and ensure compliance. This article explores how to design, orchestrate, and govern these essential workflows, leveraging automation to transform your decision-making.

How Approval Workflows Drive Efficiency

At its core, an approval workflow formalizes and automates the path a request takes from submission to resolution. Instead of relying on manual follow-ups and ambiguous chains of command, it establishes a clear, predictable, and auditable process for decision-making.

What defines an approval workflow?

An approval workflow is a specific type of business process that requires formal authorization from one or more stakeholders before an action can be completed. It’s a system of rules that dictates who needs to approve what, under which conditions, and in what order. This structure is essential for maintaining control over critical operations, managing resources, and mitigating risk. By codifying these rules, organizations can ensure that decisions are made consistently and in compliance with internal policies and external regulations.

Key components of an effective approval process

A well-designed approval process consists of several distinct components that work together to ensure smooth and reliable execution:

• Approvers: The individuals or groups responsible for reviewing and making decisions on a request. Roles should be clearly defined to avoid confusion.
• Stages: The distinct steps in the approval process. A simple workflow might have a single stage, while a complex one could involve multiple stages with different approvers at each level.
• Conditions: The rules that determine how a request is routed. For example, an expense report over $5,000 might require an additional level of approval from a department head.
• Notifications: Automated alerts that inform stakeholders of pending requests, decisions, and status changes. This eliminates the need for manual follow-ups.
• Audit Trail: A complete, unchangeable record of every action taken within the workflow, including who submitted the request, who approved or rejected it, when they did so, and any comments they provided. This is crucial for compliance and accountability.

For a deeper dive into how these components come together, you can explore guides on how to automate manual approval processes.

Types of Approval Flows for Every Scenario

Approval workflows are not one-size-fits-all. The structure of the flow depends on the complexity of the decision and the number of stakeholders involved.

Sequential approvals

In a sequential workflow, approvals happen in a specific, linear order. A request must be approved by the first person in the chain before it moves to the next. This is common in hierarchical structures, such as an employee’s expense report being approved by their direct manager before being sent to the finance department.

Parallel approvals

A parallel workflow allows multiple people to approve a request simultaneously. The process can proceed once all required approvers have given their consent, or sometimes when just one person from a designated group approves. This model is useful for decisions that require input from different departments, like a new marketing campaign that needs approval from legal, brand, and product teams at the same time.

Conditional and dynamic approvals

These are the most sophisticated types of approval workflows. The approval path changes dynamically based on the data within the request. For example, a purchase order under $1,000 might be auto-approved, while an order between $1,000 and $10,000 requires a manager’s approval, and anything over $10,000 is routed to a VP. This logic is built directly into the workflow, ensuring the right people are involved without manual intervention.

Why Orchestration is Critical for Production Approvals

While simple approval tools exist, managing these processes at scale in a production environment requires a robust orchestration platform. Orchestration goes beyond simple routing; it provides the reliability, integration, and governance needed for mission-critical decisions.

An orchestration platform is essential for:

• Ensuring consistency and repeatability: Every approval request follows the exact same process, eliminating inconsistencies and ensuring that all compliance checks are met every time.
• Providing comprehensive audit trails: Orchestrators automatically log every step, decision, and data point, creating an immutable record for compliance audits and internal reviews.
• Integrating with diverse systems: Modern approvals often require data from or actions in multiple systems (ITSM, ERP, HR platforms, Slack, email). An orchestration platform with a rich plugin ecosystem can connect these disparate tools into a single, cohesive workflow.
• Handling retries, timeouts, and error scenarios: What happens if an approver doesn’t respond? Or if a downstream system is temporarily unavailable? An orchestration platform can manage these workflow errors with automated retries, timeouts, and fallback procedures.
• Enabling human-in-the-loop decisions: The ability to pause and resume flows is fundamental to approval workflows. Orchestration platforms provide this as a core feature, allowing a fully automated process to halt for a human decision and then resume based on the outcome, a key principle of Human-in-the-Loop (HITL) Orchestration.

Orchestrate Approval Workflows with Kestra: An Expense Report Scenario

Let’s illustrate how orchestration works with a practical example: an automated expense report approval process. An employee submits their expenses through a simple form, which triggers a Kestra workflow via a webhook. The workflow then automates the entire approval process.

The YAML below defines this flow. It listens for a webhook submission, sends a formatted approval request to a manager in Slack, and pauses execution. Based on the manager’s decision (made by resuming the flow with a specific status), it either proceeds to a mock payment processing step or notifies the employee of the rejection.

id: expense-report-approval
namespace: finance.team

triggers:
  - id: listen-for-submission
    type: io.kestra.plugin.core.trigger.Webhook
    key: "expense-report-key"

tasks:
  - id: send-approval-request
    type: io.kestra.plugin.notifications.slack.SlackIncomingWebhook
    url: "{{ secret('SLACK_WEBHOOK_URL') }}"
    payload: |
      {
        "text": "New Expense Report for Approval",
        "blocks": [
          {
            "type": "section",
            "text": {
              "type": "mrkdwn",
              "text": "An expense report from *{{ trigger.body.employee_name }}* for *${{ trigger.body.amount }}* requires your approval."
            }
          },
          {
            "type": "section",
            "text": {
              "type": "mrkdwn",
              "text": "Reason: _{{ trigger.body.reason }}_"
            }
          },
          {
            "type": "actions",
            "elements": [
              {
                "type": "button",
                "text": {
                  "type": "plain_text",
                  "text": "Approve"
                },
                "style": "primary",
                "action_id": "approve"
              },
              {
                "type": "button",
                "text": {
                  "type": "plain_text",
                  "text": "Reject"
                },
                "style": "danger",
                "action_id": "reject"
              }
            ]
          }
        ]
      }

  - id: wait-for-decision
    type: io.kestra.plugin.core.flow.Pause
    timeout: PT3D # Pause for up to 3 days

  - id: process-decision
    type: io.kestra.plugin.core.flow.If
    condition: "{{ parent.outputs['wait-for-decision'].state.name == 'SUCCESS' }}"
    then:
      - id: process-payment
        type: io.kestra.plugin.scripts.python.Script
        script: |
          print("Processing payment for employee: {{ trigger.body.employee_name }} for amount {{ trigger.body.amount }}")
          # Add API call to financial system here
    else:
      - id: notify-rejection
        type: io.kestra.plugin.notifications.slack.SlackIncomingWebhook
        url: "{{ secret('SLACK_EMPLOYEE_WEBHOOK_URL') }}"
        payload: |
          {
            "text": "Your expense report for ${{ trigger.body.amount }} was rejected. Reason: {{ parent.outputs['wait-for-decision'].state.value }}"
          }

Points worth noticing in this example:

• Declarative Logic: The entire approval process, including integrations and conditional logic, is defined in a single, version-controllable YAML file.
• Human-in-the-Loop: The built-in Pause task is designed specifically for human interaction, cleanly separating the automated and manual steps.
• Integrated Communication: The workflow communicates directly with users on platforms like Slack for notifications and decision-making, meeting them where they work.
• Full Audit Trail: Kestra automatically logs the initial submission, the pause for approval, and the final decision, providing a complete and auditable history of the entire process.
• Extensibility: The Python script for payment processing can be easily replaced with a dedicated plugin or API call to any financial system, making the pattern adaptable to various business processes.

Key Capabilities in Approval Workflow Software

When selecting a tool to manage your approval workflows, look for a platform that provides a comprehensive set of capabilities to handle real-world complexity.

• Customizable Inputs and Forms: The ability to collect necessary information from users is crucial. This can be achieved through webhooks that receive data from external forms or through features like Kestra Apps, which allow you to build custom user interfaces directly on top of your workflows.
• Automated Notifications and Reminders: The system should automatically notify approvers of pending tasks and remind them if a decision is overdue. Integration with multiple channels (Email, Slack, Teams, PagerDuty) is essential.
• Real-time Tracking, Logs, and Reporting: Stakeholders need visibility into the status of any request. A centralized UI with detailed logs, execution history, and audit trails provides the necessary transparency.
• Integration Capabilities: The tool must connect to your existing systems. A platform with a large library of plugins (Kestra offers over 1,700) can easily integrate with databases, cloud services, ITSM platforms, and business applications.
• Security and Compliance Features: For enterprise-grade approvals, features like Role-Based Access Control (RBAC), SSO integration, and secure workflow secret management are non-negotiable.

Common Use Cases for Automated Approvals

Approval workflows are applicable across virtually every department in an organization, bringing structure and efficiency to critical decision points.

• Finance: Automating invoice processing and expense report approvals ensures timely payments and compliance with financial controls. This is a core process in financial services and retail operations.
• IT and Operations: Managing IT change requests, provisioning new infrastructure with a Terraform approval gate, or granting access to systems requires a formal, auditable approval process. Companies like Crédit Agricole (CAGIP) and Dataport rely on orchestration to govern their complex infrastructure operations.
• Human Resources: From new hire onboarding and vacation requests to compensation changes, HR workflows are filled with decision points that benefit from automation and clear audit trails.
• Legal and Compliance: Contract review and document sign-off processes can be streamlined, ensuring all legal and regulatory requirements are met. This is particularly vital in regulated industries like healthcare.
• Supply Chain and Retail: For global brands like FILA, orchestrating complex ERP and supply-chain workflows, including purchase order approvals, is essential for operational efficiency.
• Data and Analytics: Before promoting a dbt model to production, an approval gate can ensure a senior engineer has reviewed the code and its impact, as shown in this dbt Core approval blueprint.

Related concepts

• Workflow Governance: Manage & Automate Operations
• RBAC Workflow Orchestration: Secure Access with Kestra
• Human-in-the-Loop (HITL) Orchestration Explained
• Kestra Blueprints for Approval Workflows
• Introducing Apps: Custom UIs for Kestra Workflows
• Automate Manual Approval Processes

Ready to automate your approval processes? Explore Kestra’s capabilities and blueprints.