How to Use Full-loop demo to Fix every stage of the SDLC

A full-loop demo means one thing: you take a feature from spec to merged, tested, deployed PR in a single continuous run. No switching contexts. No manual handoffs. No waiting for reviews. Here is how to do it.

What is a full-loop demo?

A full-loop demo takes a feature request through every stage of the SDLC:

• Spec: translates requirements into acceptance criteria

• Code: generates implementation from spec

• Test: creates tests for the implementation

• Security: scans for vulnerabilities

• Review: submits a PR with all context

• Merge: PR gets approved and merged

All in one continuous run. No human intervention between stages.

Why does this matter? Because it compresses a 3-day process into 30 minutes.

The SDLC stages at a glance
Stage 1: Spec — 0-2 min

Transform Jira ticket into structured requirements

Stage 2: Code — 2-10 min

Generate implementation from spec

Stage 3: Test — 10-18 min

Create and execute test suite

Stage 4: Security — 18-22 min

Run SAST, dependency checks, secret scanning

Stage 5: Review — 22-25 min

Auto-generate PR with description and context

Stage 6: Merge — 25-30 min

CI/CD runs, PR approved, code merged
Stage 1: From Jira ticket to structured spec (0-2 min)

What happens

Start with a Jira ticket:

"Add user profile editing." That is all the spec you have.

The full-loop demo transforms this into:

• User story with context

• Acceptance criteria (AC)

• Edge cases to consider

• API contract (if applicable)

• Database schema changes
  

  How to do it

  1. Paste the Jira ticket into your full-loop tool.

  2. The tool generates structured spec with: • User story: 'As a [user], I want to [action] so I can [outcome]' • 5-7 acceptance criteria written in Gherkin • Edge cases: what if user has no profile? What if update fails? • API contract: input/output shapes

  3. Review and edit if needed (usually not needed). Output: a structured spec ready for code generation. Stage 2: From spec to code (2-10 min) What happens The tool reads the spec and generates implementation code. For a user profile endpoint, it generates: • Route handler (/api/users/{id}/profile) • Request validation • Database queries • Error handling • Response formatting How to do it

  4. Hit 'Generate Code' in the full-loop tool.

  5. Specify your tech stack (Node + Express, Python + FastAPI, Go, etc).

  6. The tool generates code that matches your codebase style.

  7. Code is linted and formatted automatically. Output: production-ready code, ready for tests.

Stage 3: From code to tests (10-18 min)

What happens

The tool analyzes the generated code and creates tests.

Tests cover:

• Happy path (user updates profile successfully)

• Validation errors (invalid email, missing name)

• Authorization (user can only edit their own profile)

• Edge cases (profile has no photo, max text length)

• Error paths (database down, network timeout)

  How to do it

  1. Hit 'Generate Tests' in the full-loop tool.

  2. Specify your test framework (Jest, Pytest, Go testing, etc).

  3. The tool generates tests with: • Unit tests for validation logic • Integration tests for API routes • Mock external dependencies

  4. Tests run automatically. Full suite completes in 3-5 minutes. Output: passing test suite. Code coverage reported.

Stage 4: From code to security scan (18-22 min)

What happens

The tool runs security checks:

• SAST (Static Application Security Testing) — finds code vulnerabilities

• Dependency checks — detects known vulnerable packages

• Secret scanning — ensures no hardcoded credentials

• License compliance — checks for GPL violations

  How to do it

  1. Hit 'Run Security Scan' in the full-loop tool.

  2. The tool runs all checks in parallel.

  3. Results are summarized: • High-severity findings: blocks merge • Medium-severity: requires review • Low-severity: warning only

  4. Common issues are auto-fixed (dependency updates, formatting). Output: security report. Code ready for review.

Stage 5: From code to PR (22-25 min)

What happens

The tool creates a GitHub/GitLab PR with:

• Clear title (auto-generated from spec)

• Description with context from Jira ticket

• Testing checklist (manual tests users should run)

• Deployment notes (what changed, what might break)

• Links to spec, tests, security report

  How to do it

  1. Hit 'Create PR' in the full-loop tool.

  2. PR is created against your main branch.

  3. PR description is auto-populated with: • Closes: [Jira ticket] • Changes: clear summary • Testing: manual test steps • Breaking changes: any API changes?

  4. Assign reviewers (if not automated). Output: PR ready for code review.

Stage 6: From PR to merged code (25-30 min) What happens Your CI/CD pipeline runs: • Code linting and formatting • Unit and integration tests • Build step (if applicable) • Automated security checks (again) • Performance regression checks If all pass, PR can be auto-merged (if configured). How to do it

1. Push the PR (step 5 already did this).

2. CI/CD runs automatically.

3. If CI passes, PR can be merged immediately (no manual review needed if this is a demo).

4. For real production code, you would add a human review step between step 5 and 6. Output: code merged to main. Feature ready for deployment.Timing: the real numbers

   Here is how long each stage actually takes:

   • Spec generation: 1-2 minutes (mostly waiting for LLM)

   • Code generation: 4-8 minutes (varies by complexity)

   • Test generation: 5-8 minutes (test suite runs)

   • Security scan: 3-4 minutes (parallel scanning)

   • PR creation: 1-2 minutes (mostly fast)

   • CI/CD + merge: 5-10 minutes (depends on your CI)

   Total: 25-35 minutes for a complete feature. Compare that to 3 days of manual work.

   Running your first full-loop demo

   Step 1: Pick a small feature.

   • Not a complex feature (save that for later)

   • Something with clear requirements

   • Example: 'Add user preferences page' or 'Export data to CSV'

   Step 2: Create a Jira ticket with clear description.

   Step 3: Paste the ticket into the full-loop tool.

   Step 4: Hit 'Run Full Loop.'

   Step 5: Watch it work. It takes 30 minutes.

   Step 6: Review the output:

   • Does the generated code match your codebase style?

   • Do the tests cover the requirements?

   • Did security scanning find anything?

   • Is the PR description clear?

   Step 7: Merge (or review and merge).

Take a feature from spec to merged PR in one run. Try it on your project https://www.walnutai.ai/