Technical due diligence is where many Australian SaaS deals quietly fall apart.
Not because there’s a critical bug or catastrophic flaw. But because the business is technically sound in the founder’s hands and technically opaque to everyone else. No documentation. No architecture diagrams. Processes that only the founding engineer understands. A codebase that works beautifully but can’t be explained.
US private equity firms and strategic acquirers have learned — often expensively — that a SaaS business is only worth what new owners can actually operate and scale. When they can’t verify that, they either pass or discount heavily.
This guide breaks down exactly what international buyers examine when acquiring an Australian SaaS or tech business, how to prepare your technical environment for scrutiny, and what red flags to fix before going to market.
Table of Contents
- Why Technical Due Diligence Matters for Australian Founders
- Who Conducts Technical Due Diligence
- The Full Tech Due Diligence Checklist
- Code Quality and Documentation
- Infrastructure and Scalability
- Security and Data Protection
- Third-Party Dependencies
- Technical Debt Assessment
- Australian-Specific Technical Considerations
- Preparing Your Tech Stack for Sale
- Common Technical Due Diligence Red Flags
- Next Steps
Why Technical Due Diligence Matters for Australian Founders
Technical due diligence has two functions for buyers:
1. Risk verification: Is there anything that could break, require emergency spending, or create legal liability after acquisition?
2. Confidence building: Can new owners operate, scale, and build on this foundation?
For Australian SaaS founders specifically, there’s an added dimension: buyers are often 12-18 time zones away, with no ability to physically inspect your setup or easily call your team. Everything must be documented. Everything must be verifiable.
The valuation impact is real:
A Melbourne SaaS with $2M ARR and excellent business metrics but poor technical documentation might achieve 4.5x ARR. The same business with comprehensive technical documentation achieves 5.5-6x. That’s $2-3M on the same revenue.
Documentation is money.
Who Conducts Technical Due Diligence
Understanding your reviewers shapes how you prepare.
Smaller Acquisitions (<$3M)
Who does it:
- The buyer themselves (often technically capable)
- A technical adviser they bring in
- Sometimes skipped for very small deals
What they focus on:
- Can they understand the product?
- Major operational risks
- Key dependencies
- Stack transferability
Mid-Market Acquisitions ($3-15M)
Who does it:
- Dedicated technical due diligence firm
- Buyer’s technical team
- Sometimes the acquiring company’s CTO
What they focus on:
- Full code quality assessment
- Security audit
- Infrastructure review
- Scalability assessment
- Integration dependencies
Larger Acquisitions ($15M+)
Who does it:
- Specialist technical due diligence firms (Bain, FTI Consulting, boutiques)
- Intensive process (1-4 weeks)
What they focus on:
- Everything in mid-market, plus:
- Proprietary IP assessment
- Patent landscape
- Competitive technical analysis
- Architecture scalability for 10x growth
The Full Tech Due Diligence Checklist
Here is the complete list of what international buyers will request.
1. Architecture and Product
- [ ] System architecture diagram (current)
- [ ] Database schema overview
- [ ] Data flow diagrams
- [ ] API documentation (internal and external)
- [ ] Product feature roadmap (last 12 months delivered, next 12 months planned)
- [ ] Technology decisions log (why you chose key components)
- [ ] Microservices vs monolith explanation (if applicable)
- [ ] Multi-tenancy architecture (for SaaS)
- [ ] White-label capability (if sold)
2. Infrastructure
- [ ] Infrastructure diagram (cloud architecture)
- [ ] Cloud provider(s) and region(s)
- [ ] Infrastructure as code (Terraform, CloudFormation, etc.)
- [ ] Container configuration (Docker, Kubernetes)
- [ ] Staging/test environment setup
- [ ] CI/CD pipeline documentation
- [ ] Deployment process documentation
- [ ] Monitoring and alerting setup (Datadog, New Relic, etc.)
- [ ] Uptime/availability history (last 12 months)
- [ ] Disaster recovery plan
3. Security
- [ ] Security policy documentation
- [ ] Authentication system overview
- [ ] Data encryption (at rest and in transit)
- [ ] Access control model (RBAC documentation)
- [ ] Password policy and MFA implementation
- [ ] Security audit history (pentest results)
- [ ] Vulnerability management process
- [ ] Known vulnerabilities and remediation status
- [ ] Data breach incident history (if any)
- [ ] Bug bounty programme (if applicable)
4. Code Quality
- [ ] Programming languages and frameworks used
- [ ] Code repository access (GitHub, GitLab, Bitbucket)
- [ ] Code coverage percentage
- [ ] Automated test suite overview
- [ ] Code review process documentation
- [ ] Technical debt register
- [ ] Coding standards and style guides
- [ ] Version control practices
5. Third-Party Dependencies
- [ ] Complete list of third-party services (APIs, tools, platforms)
- [ ] Critical dependency identification (business stops without it)
- [ ] Pricing for each dependency
- [ ] Contract/subscription details and terms
- [ ] Alternatives for critical dependencies
- [ ] Open-source licence compliance
6. Data
- [ ] Data dictionary or schema documentation
- [ ] Data retention policies
- [ ] Backup procedures and test results
- [ ] Data volume and growth rate
- [ ] Data portability/export capabilities
- [ ] Customer data deletion process
7. Compliance
- [ ] Australian Privacy Act compliance documentation
- [ ] GDPR compliance (if EU customers)
- [ ] Industry-specific compliance (HIPAA, PCI-DSS, SOC2 if applicable)
- [ ] Data processing agreements with third parties
- [ ] Privacy policy review date and legal sign-off
8. Performance
- [ ] Application performance benchmarks
- [ ] Load test results (or load capacity estimates)
- [ ] Historical uptime data
- [ ] Performance monitoring setup
- [ ] Slowest parts of the application (known bottlenecks)
9. IP and Licensing
- [ ] IP ownership confirmation (company vs individuals)
- [ ] Software licence list (commercial licences used)
- [ ] Open-source component list and licences
- [ ] Patent registrations (if any)
- [ ] Trade secrets documentation
10. Team and Knowledge
- [ ] Engineering team overview (roles, seniority, tenure)
- [ ] Key person dependency identification
- [ ] Onboarding documentation for new engineers
- [ ] Architecture decision records
- [ ] Internal wiki or knowledge base overview
Code Quality and Documentation
This is where Australian founders most often struggle.
What Buyers Look For
Code organisation:
- Logical folder structure
- Consistent naming conventions
- Separation of concerns
- No dead code cluttering the codebase
Documentation within code:
- Functions and classes commented
- Complex logic explained
- README files at all levels
- CHANGELOG maintained
Test coverage: International buyers increasingly expect minimum test coverage. Benchmarks:
- <30%: Concern — what’s hiding?
- 30-60%: Acceptable for most buyers
- 60-80%: Good
- 80%+: Excellent
Testing types expected:
- Unit tests for core business logic
- Integration tests for key workflows
- End-to-end tests for critical user paths
How to Improve Before Sale
If your codebase is underdocumented:
Week 1-2: Add README files
- Main README: Project overview, setup, deployment
- Module READMEs: Component purpose and usage
Month 1: Document architecture
- High-level system diagram
- Component responsibilities
- Data flow overview
- Key architectural decisions
Months 2-3: Improve test coverage
- Focus on core revenue-generating flows first
- Don’t chase 80% — get critical paths covered
- Document what isn’t covered and why
Ongoing: Clean up technical debt register
- Known issues documented (honesty is valued over perfection)
- Prioritised with estimates
- Clear remediation plan
Infrastructure and Scalability
International buyers want to know the business can scale to 10x without a major rebuild.
The Scalability Question
What buyers want to hear:
“Our infrastructure is hosted on AWS in the Sydney region with auto-scaling enabled. We’ve load tested to 10x current traffic. Our database can handle the expected growth for the next 2-3 years with index optimisation alone. A multi-region expansion would require [specific, documented steps].”
What concerns buyers:
“It’s on a single server we manage ourselves and it works fine for now.”
Infrastructure Documentation Requirements
Cloud architecture:
- Specific services used (EC2, RDS, Lambda, etc.)
- Why those services (documented decisions)
- Scaling configuration
- Cost breakdown by service
Uptime history: International buyers want 99.9%+ uptime over last 12 months. If you’ve had incidents, document them with root cause analysis and remediation.
Cost scaling model: Can you explain how infrastructure costs scale with customer growth? Buyers want evidence that unit economics don’t deteriorate with scale.
Security and Data Protection
Security due diligence has become the highest-scrutiny area of technical review.
Security Audit
Buyers increasingly expect:
- External penetration test within last 12-18 months
- Results disclosed (findings and remediation)
- Evidence of ongoing vulnerability scanning
If you haven’t done a pentest: Commission one 6-9 months before sale. $5,000-$20,000 investment. Returns far more in buyer confidence and faster closing.
Common security red flags buyers find:
- Hard-coded API keys or credentials in repository
- Outdated dependencies with known vulnerabilities
- No MFA for admin access
- Unencrypted sensitive data at rest
- Missing HTTPS on all endpoints
- SQL injection vulnerabilities
- Excessive admin access for too many users
Australian founders — check your repository history. Many founders have accidentally committed credentials at some point. Scrub these from git history before buyer access.
Data Privacy Compliance
Australian Privacy Act:
- Document compliance approach
- Privacy policy current and reviewed by lawyer
- Data collection documented and justified
- Third-party data sharing documented
- Breach notification procedure in place
GDPR (if EU customers):
- Data processing legal basis documented
- Data subject rights procedures
- DPA (Data Processing Agreements) with processors
- Data transfer mechanisms (standard contractual clauses)
International buyers care deeply about data compliance — particularly US PE firms who’ve seen regulatory risk destroy portfolio company value.
Third-Party Dependencies
Dependencies are a double-edged sword: they enable rapid development but create concentration risk.
Critical Dependency Assessment
For each dependency, answer:
- What breaks if this disappears? (Revenue impact)
- Can we switch in 30 days? (Switchability)
- Have we read the ToS for sale/transfer provisions? (Legal)
- What’s the pricing risk? (Unit economics)
High-risk dependencies to document carefully:
- Payment processors (Stripe, Braintree) — ToS review for ownership change
- Email providers — List transfer provisions
- Authentication providers (Auth0, Okta) — Account transfer requirements
- AI/ML APIs (OpenAI, Google) — Pricing risk, ToS
- Communication tools (Twilio, SendGrid) — Transfer provisions
- Analytics platforms — Data ownership and transfer
For Australian businesses: Many US SaaS tools have international pricing that adds AUD/USD risk. Document this for buyers.
Open Source Licensing
A commonly overlooked risk area.
Problematic licences for commercial software:
- GPL (copyleft — may require your code to be open sourced)
- AGPL (network copyleft — particularly restrictive for SaaS)
Acceptable licences:
- MIT, Apache 2.0, BSD — permissive, no issue
- LGPL — acceptable with proper usage
Action: Run licence audit tool (FOSSA, Black Duck, or manual npm/pip licence-checker). Document findings. Remediate GPL/AGPL issues before sale if possible.
Technical Debt Assessment
Honest technical debt documentation is valued more than hidden problems.
What Buyers Want to See
A technical debt register including:
- Known issues with description
- Estimated remediation time
- Business risk if not fixed
- Priority (critical, high, medium, low)
Why transparency wins:
Buyers know every software business has technical debt. A founder who can clearly articulate the debt, its impact, and the remediation plan demonstrates technical maturity and earns trust.
A founder who claims to have no technical debt loses credibility immediately.
Example technical debt entry:
Issue: Database queries not optimised for scale
Description: Several report queries run full table scans.
Works fine at current scale (500 customers).
May require indexing work at 2,000+ customers.
Impact: Performance degradation for reporting functions at scale
Remediation: 2 weeks of engineering time, adding composite indexes
Priority: Medium (not urgent, plan for next 6 months)
Australian-Specific Technical Considerations
International buyers have specific questions about Australian tech businesses.
Data Sovereignty
Question from US buyers: “Why is data hosted in Australia? Can we move it to US AWS?”
Prepare your answer:
- Customer contractual requirements (if any)
- Regulatory requirements (if any)
- Cost of migration
- Timeline for migration
- Whether Australian hosting is a customer selling point
For most SaaS businesses, Australian data hosting is flexible — document that migration is possible with a clear plan.
Latency for International Customers
If you have US customers: How does the Australian hosting affect their experience?
Document:
- Average response times from US
- Any CDN or edge caching in place
- Plans for multi-region expansion
- Whether latency is a customer complaint (usually it isn’t for SaaS)
Australian Engineering Team
Buyers frequently ask about Australian talent:
- Engineering team overview (skills, seniority)
- Where are team members (Melbourne, Sydney, remote?)
- Retention considerations
- Salary benchmarks (often lower than US → positive for acquirers)
For acquirers wanting to retain team:
- Australian employment law implications
- Super obligations
- Contractor vs employee distinctions
- Remote work norms
Time Zone Impact on Technical Operations
Document:
- On-call arrangements (who handles production issues at 2am?)
- Incident response process across time zones
- How you support US customers outside Australian hours
- Automation that compensates for timezone gaps
Preparing Your Tech Stack for Sale
A 3-6 month technical preparation plan.
Months 6-4: Documentation Sprint
Month 6:
- Commission architecture diagram (Lucidchart, Draw.io)
- Create infrastructure overview document
- List all third-party dependencies with details
- Review open-source licences
Month 5:
- Security audit (external pentest)
- Credential audit (check repos for secrets)
- Enable MFA on all admin accounts
- Update dependencies to remove known vulnerabilities
Month 4:
- Create technical debt register
- Write infrastructure runbooks
- Document deployment process
- Create engineer onboarding guide
Months 3-1: Polish and Buyer Preparation
Month 3:
- Improve test coverage on critical paths
- Clean up repository (remove dead code, old branches)
- Update all README files
- Verify backup and recovery procedures work
Month 2:
- Privacy compliance review (Australian Privacy Act + GDPR)
- Data processing agreements signed with key processors
- Security remediation from pentest
- Performance benchmarks documented
Month 1:
- Data room technical section complete
- Architecture documentation final
- All admin credentials shared via secure channel (not committed to repos)
- Buyer access setup (read-only for due diligence)
Granting Buyer Access
Best practice for technical due diligence access:
Code repository:
- Create read-only access for due diligence
- Remove any committed secrets first
- Grant access to specific branch/tag rather than full history if sensitive
Infrastructure:
- Read-only AWS/GCP/Azure access (IAM role with limited permissions)
- Never share root account credentials
- Document what they can and can’t see
Database:
- Read-only access to anonymised/scrubbed data
- Never provide access to production customer data during due diligence
- Provide schema access separately
Common Technical Due Diligence Red Flags
Fix these before buyers find them.
🔴 Critical Red Flags (Deal killers or major discounts)
Credentials in code: API keys, database passwords, access tokens committed to repository history. Fix: Audit and clean git history. Rotate all exposed credentials.
No backups: No automated backup system or untested backups. Fix: Implement and test. Document. Show proof.
GPL-licensed components in commercial product: May require your code to be open-sourced. Fix: Replace GPL components with MIT/Apache alternatives.
Active data breach or ongoing security incident: Fix: Resolve before going to market.
🟡 Significant Red Flags (Require explanation, discount applied)
No test coverage: Buyers can’t verify code quality without tests. Fix: Add tests to critical business logic minimum.
Single server deployment: No redundancy, single point of failure. Fix: Move to at least active/standby or document migration plan.
Undocumented architecture: Buyer can’t understand system without founder explanation. Fix: Create architecture diagrams and documentation.
Key person dependency: Only one engineer understands critical systems. Fix: Document systems, cross-train team member.
🟠 Yellow Flags (Note and explain)
Older tech stack: Ruby 2.x, PHP 5.x, etc. Not disqualifying but requires explanation. Fix: Document migration plan or explain why not urgent.
Missing automated tests: Manual QA only. Fix: Start with smoke tests for critical paths.
Monolith architecture: Not a problem per se, but explain scaling plan. Fix: Document refactoring roadmap if relevant.
Next Steps
Free Technical Readiness Assessment
As part of our free business valuation, we assess technical readiness for international buyer scrutiny:
- Review your technical documentation
- Identify key gaps vs buyer expectations
- Prioritise what to fix before going to market
- Estimate technical preparation timeline
- Connect you with technical M&A consultants if needed
How We Support Through Technical Due Diligence
When you engage us to sell your business:
- We prepare technical buyers for your stack before they start review
- Coordinate technical due diligence with your team
- Handle time zone coordination for technical review calls
- Identify and resolve issues before they become deal problems
- Our Website Closers partnership means buyers are pre-educated on Australian tech standards
Get Free Technical Readiness Assessment → | Book Consultation → | Call +61 3 8256 7507
Conclusion
Technical due diligence is both a risk-verification exercise and a confidence-building opportunity. Australian founders who understand what buyers will examine — and prepare accordingly — transform potential red flags into evidence of a well-run, transferable business.
Key priorities for Australian SaaS founders:
- Architecture documentation — buyers can’t value what they can’t understand
- Security audit — pentest is table stakes for $2M+ deals
- Credential hygiene — check your repository history
- Dependencies documented — especially third-party ToS for transfer
- Data compliance — Australian Privacy Act + GDPR if applicable
- Technical debt register — transparency builds trust
- Australian-specific context — help international buyers understand your environment
Start technical preparation 6 months before sale. The investment in documentation and security pays back many times in higher confidence, faster due diligence, and better multiple.
Disclaimer: General information only. Not legal, technical, or financial advice.
Reading Time: 22 minutes | Category: Technical Due Diligence, SaaS Exit
