Planning checklist
SaaS Architecture Decision Guide
Questions for deciding tenancy, identity, entitlements, data isolation, administration and production ownership in a SaaS product.
Published by SpeedInno · Material review 15 August 2026
Quick checklist
Review these items first. Marking an item is not proof of readiness; retain the decision, evidence and accountable owner described in the detailed guidance below.
- Organizations and usersDefine whether users belong to one or many organizations and who controls membership.
- TenancyDecide whether shared tenancy creates meaningful operating value and what isolation the data and risk model requires.
- Plans and entitlementsSeparate billing-provider behavior from product access, limits, trials, cancellation and internal overrides.
- AdministrationDesign support, audit, configuration and exception workflows as production capabilities.
- Identity and authorizationModel authentication, roles, resource permissions and privileged operations.
- Data lifecyclePlan migrations, backups, deletion inputs, exports and tenant-aware observability.
- Integration contractsDefine external APIs, webhooks, retries, idempotency and failure handling.
- Release and supportName environment, deployment, alerting, incident and product-support owners.
How to use this resource
- 1.Work through it with the people who own the workflow, data and release decision.
- 2.Attach evidence or a named open question to every material answer.
- 3.Separate confirmed facts, assumptions, risks and decisions that require approval.
- 4.Finish with an owner, next decision and review date, not a checked document only.
Use four decision states, not a misleading percentage score
Confirmed
Evidence exists and the accountable owner accepts it.
Assumption
A working belief is recorded with a validation action and date.
Risk
The uncertainty can materially change scope, safety, cost or release.
Not applicable
The rationale is explicit and has been reviewed; it is not simply unanswered.
Product boundaries
Architecture follows the product model and operating responsibilities.
Organizations and users
Define whether users belong to one or many organizations and who controls membership.
Questions to resolve
- What is the verified current state of organizations and users, and which source supports it?
- What must be true at the next approval or release point, and what is explicitly outside the decision?
- Which exception, dependency or failure condition could invalidate the current answer?
- Who can approve the answer, who performs the work and who responds when it fails?
Evidence to retain
- A current-state artifact, observation or system record, not recollection alone.
- The selected decision, alternatives considered and the reason for the trade-off.
- An accountable owner, dependency owner and review or expiry date.
- Observable acceptance evidence and a recovery or escalation path where failure matters.
Tenancy
Decide whether shared tenancy creates meaningful operating value and what isolation the data and risk model requires.
Questions to resolve
- What is the verified current state of tenancy, and which source supports it?
- What must be true at the next approval or release point, and what is explicitly outside the decision?
- Which exception, dependency or failure condition could invalidate the current answer?
- Who can approve the answer, who performs the work and who responds when it fails?
Evidence to retain
- A current-state artifact, observation or system record, not recollection alone.
- The selected decision, alternatives considered and the reason for the trade-off.
- An accountable owner, dependency owner and review or expiry date.
- Observable acceptance evidence and a recovery or escalation path where failure matters.
Plans and entitlements
Separate billing-provider behavior from product access, limits, trials, cancellation and internal overrides.
Questions to resolve
- What is the verified current state of plans and entitlements, and which source supports it?
- What must be true at the next approval or release point, and what is explicitly outside the decision?
- Which exception, dependency or failure condition could invalidate the current answer?
- Who can approve the answer, who performs the work and who responds when it fails?
Evidence to retain
- A current-state artifact, observation or system record, not recollection alone.
- The selected decision, alternatives considered and the reason for the trade-off.
- An accountable owner, dependency owner and review or expiry date.
- Observable acceptance evidence and a recovery or escalation path where failure matters.
Administration
Design support, audit, configuration and exception workflows as production capabilities.
Questions to resolve
- What is the verified current state of administration, and which source supports it?
- What must be true at the next approval or release point, and what is explicitly outside the decision?
- Which exception, dependency or failure condition could invalidate the current answer?
- Who can approve the answer, who performs the work and who responds when it fails?
Evidence to retain
- A current-state artifact, observation or system record, not recollection alone.
- The selected decision, alternatives considered and the reason for the trade-off.
- An accountable owner, dependency owner and review or expiry date.
- Observable acceptance evidence and a recovery or escalation path where failure matters.
Production decisions
Make day-two ownership visible before launch.
Identity and authorization
Model authentication, roles, resource permissions and privileged operations.
Questions to resolve
- What is the verified current state of identity and authorization, and which source supports it?
- What must be true at the next approval or release point, and what is explicitly outside the decision?
- Which exception, dependency or failure condition could invalidate the current answer?
- Who can approve the answer, who performs the work and who responds when it fails?
Evidence to retain
- A current-state artifact, observation or system record, not recollection alone.
- The selected decision, alternatives considered and the reason for the trade-off.
- An accountable owner, dependency owner and review or expiry date.
- Observable acceptance evidence and a recovery or escalation path where failure matters.
Data lifecycle
Plan migrations, backups, deletion inputs, exports and tenant-aware observability.
Questions to resolve
- What is the verified current state of data lifecycle, and which source supports it?
- What must be true at the next approval or release point, and what is explicitly outside the decision?
- Which exception, dependency or failure condition could invalidate the current answer?
- Who can approve the answer, who performs the work and who responds when it fails?
Evidence to retain
- A current-state artifact, observation or system record, not recollection alone.
- The selected decision, alternatives considered and the reason for the trade-off.
- An accountable owner, dependency owner and review or expiry date.
- Observable acceptance evidence and a recovery or escalation path where failure matters.
Integration contracts
Define external APIs, webhooks, retries, idempotency and failure handling.
Questions to resolve
- What is the verified current state of integration contracts, and which source supports it?
- What must be true at the next approval or release point, and what is explicitly outside the decision?
- Which exception, dependency or failure condition could invalidate the current answer?
- Who can approve the answer, who performs the work and who responds when it fails?
Evidence to retain
- A current-state artifact, observation or system record, not recollection alone.
- The selected decision, alternatives considered and the reason for the trade-off.
- An accountable owner, dependency owner and review or expiry date.
- Observable acceptance evidence and a recovery or escalation path where failure matters.
Release and support
Name environment, deployment, alerting, incident and product-support owners.
Questions to resolve
- What is the verified current state of release and support, and which source supports it?
- What must be true at the next approval or release point, and what is explicitly outside the decision?
- Which exception, dependency or failure condition could invalidate the current answer?
- Who can approve the answer, who performs the work and who responds when it fails?
Evidence to retain
- A current-state artifact, observation or system record, not recollection alone.
- The selected decision, alternatives considered and the reason for the trade-off.
- An accountable owner, dependency owner and review or expiry date.
- Observable acceptance evidence and a recovery or escalation path where failure matters.
How to turn the checklist into an implementation decision
1. Establish the baseline
Record what exists, how it was observed and where evidence is incomplete. Keep reported behavior separate from reproduced behavior. This prevents the future design from treating assumptions or one person’s workaround as an approved requirement.
2. Define the target and boundary
Describe the capability or decision the next phase must enable, the users and records it covers, and the adjacent work it deliberately does not replace. A clear exclusion is useful only when its operational consequence and owner are understood.
3. Resolve the highest-consequence uncertainty
Prioritise questions that can change architecture, data purpose, security, migration, acceptance, commercial scope or launch readiness. Test or decide those before polishing lower-risk screens and convenience features.
4. Create traceable delivery evidence
Link each accepted requirement to its decision source, implementation boundary, test or review method and release owner. When the requirement changes, update the connected artifacts instead of leaving contradictory copies in documents, tickets and code.
Expected output
The result should make tenancy, identity, data, administration, integration and operational trade-offs explicit enough to sequence a responsible product release.
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