Enterprise Capstone and Course Exit The final exercise is to convert one enterprise domain into an implementable architecture using the same reasoning applied throughout TaskFlow.
- - - - Plan - Choose domain Model invariants Design modules Define workflows Test/operate > > > > jobs/integrations > Figure 10 - Final capstone: architecture from business rules outward
Capstone options • Government/private HRIS with timekeeping, leave, payroll, deductions, recruitment, audit logs, and reports.
• Procurement + inventory with requisitions, approvals, suppliers, POs, receiving, stock movements, reservations, and accounting handoff.
• Accounting/financial management with chart of accounts, journals, periods, approvals, reconciliation, reporting, and audit evidence.
Required deliverables • Module map and dependency rules; key entities and invariants; approval/state machines; permission matrix; transaction boundaries; job/idempotency plan; integration contracts; audit strategy; reporting path; failure/recovery model; deployment/observability plan.
• Identify what remains synchronous, what becomes a worker, and what evidence would justify service extraction later.
• Write ADRs for the three highest-impact decisions and a migration plan from the current TaskFlow-shaped platform.
Course exit standard • You should now be able to explain why each layer exists, where a rule belongs, how to verify it, and how to evolve it without blindly copying a framework architecture diagram. The course is complete when you can design the next system from first principles, not when you can reproduce TaskFlow from memory. Source basis: cumulative course synthesis and final architecture capstone.
Enterprise systems are difficult because business invariants, approvals, auditability, effective dates, and permissions interact over long-lived data.
Restate the goal of “Enterprise Capstone and Course Exit” as one observable behavior. Write the success signal before touching code.
Trace the boundary map: business workflow → invariants → permissions → transaction/audit → operational outcome. Mark the one boundary this lesson changes.
Inspect the current repository state and record the exact files, route, table, or runtime involved. Avoid creating an abstraction before you can name the existing owner.
Implement the smallest vertical slice. Add one coherent change, run the narrowest verification command, and read the output before continuing.
Connect the slice to TaskFlow’s phase artifact: Enterprise expansion blueprint for an HRIS/procurement/inventory/payroll-style system with modules, workflows, events, audit, and scaling triggers.. Verify behavior from the outside as a user or API client would.
Create one controlled failure that is safe to reproduce. Predict the symptom first, capture evidence, locate the earliest broken boundary, then fix only that cause.
Close the reference and rebuild or explain the core change from memory. Record what you would monitor or test before trusting the same change in production.
Requisition -> Approval -> Purchase Order -> Goods Receipt -> Invoice
Invariant examples:
- received quantity <= ordered quantity
- finalized approvals are auditable
- closed orders reject new receiptsDo not copy this as a finished answer. Predict what each boundary does, type the smallest useful slice, run it, then compare the result with your prediction.
Return to the nearest observable boundary: input, network, process log, database, or rendered UI. Compare actual evidence with the predicted path.
Change one variable at a time and reproduce the original failure after the fix; otherwise you have correlation, not diagnosis.
Without copying the final source, create a second small scenario that applies “Enterprise Capstone and Course Exit” to a different TaskFlow resource or input. Write the acceptance criteria first, implement it, and provide the evidence that each criterion is satisfied.
Write concrete scaling triggers that would justify extracting a service, queue, cache, or separate database later.
Use the smallest change that demonstrates this lesson. Stop after it works and capture evidence.Shared database tables with unclear ownership across domains
Predict the symptom before causing the failure. Then locate the earliest boundary where reality diverges from expectation.Why does this responsibility live here, what input does it trust, what output proves success, and what would go wrong if another layer owned it?
If your explanation is vague, repeat the boundary trace before moving on.Close the reference. Reproduce the core idea from memory or explain the exact request/data flow aloud. Then check your diff or notes for accidental shortcuts that bypass validation, authorization, error handling, or verification earned in earlier phases.