If you’re planning to sell your business, your numbers will get buyers interested, but it’s your technology they will dig into once diligence starts.
They’ll ask for access to your codebase, review your infrastructure setup, and walk through how your product is deployed and maintained. Buyers want to see who owns what, how changes are made, and what happens if something breaks.
If those answers aren’t clear, the process slows down, and buyers start adjusting how they view the deal.
In this guide, I will walk you through the exact technology due diligence checklist I use with founders to prepare their business before going to market, so these issues don’t come up during a live process.
TL;DR – Tech Due Diligence Checklist
Before we get into the details, here is an overview of the tech due diligence checklist I follow when reviewing a business:
- Architecture and infrastructure are clearly mapped, stable, and can handle growth.
Code quality and development practices support continuous maintenance and new development. - Security and compliance are defined, tested, and properly documented.
- IP ownership is clean, with no gaps in assignments or licensing.
- Team and operations can run the system without relying on a single person.
- Financial and integration factors are understood, including costs, dependencies, and post-acquisition effort.
How to Prepare for a Technical Due Diligence Process
When technical diligence starts, buyers expect immediate access to your codebase, infrastructure details, and clear answers on how your system runs. If you’re still organizing that at this stage, it slows the process and changes how the deal is perceived.
Here’s how you should prepare for an M&A technical due diligence process:
- Start Early and Fix the Obvious Issues: Six months out, look at security gaps, technical debt, and anything that might raise a flag in a real review. If you know something is messy, fix it before a buyer asks about it.
- Make Your Systems Easy to Understand: Buyers want to see how your system behaves under load, how issues are handled, and what’s been intentionally left as technical debt. When that context is missing, buyers start filling in the gaps themselves.
- Decide Who Owns the Conversation: You need one person who can walk through the system end to end. If answers come from different people with different explanations, confusion sets in fast.
- Run Your Own Diligence Before Anyone Else Does: Go through your code, infrastructure, and documentation the way a buyer would. Anything unclear or incomplete should be addressed or at least understood before it gets surfaced externally.
A lot of this ties back to whether you’ve actually taken the time to assess if your business is ready to sell. If gaps start showing up here, it usually means preparation hasn’t been done early enough..
Key Risks to Identify During the Evaluation
At this stage, you need to look at your system from a buyer’s perspective. Instead of looking at how your system works day to day, focus on what a buyer would question, where the risks lie, and what might need fixing after the transition.
Some key risks that I suggest you look out for are:
- Security Gaps: When you skip penetration testing, leave access controls unclear, or handle data poorly, buyers flag it immediately. These directly affect how confident a buyer feels about the business.
- Limited Scalability: If your system struggles under higher usage or needs manual fixes to stay stable, it raises questions about how far it can realistically scale.
- Technical Debt: Every system has trade-offs. The issue arises when no one can explain what those trade-offs are or what needs to be improved. That uncertainty turns into negotiation leverage.
- One-Person Dependency: If only one engineer understands critical parts of the system and that knowledge isn’t documented, it creates hesitation around transition. Buyers look for systems that can be handed over without disruption.
Tools and Frameworks That Support a Thorough Review
Once you’ve identified the risks, the next step is making sure nothing slips through. In most deals, this is where tools and frameworks come in. They don’t replace judgment, but they make the review more structured and harder to overlook.
Below are some tools and frameworks that can help you review your technical diligence process:
Code Quality Tools
This is where buyers get a quick read on how maintainable your system actually is. Tools like SonarQube or Coverity scan for bugs, code complexity, duplication, and test coverage.
These are the exact areas buyers tend to question because they increase future development time and cost. If you’ve already reviewed this, you’ll know where those areas are and how to explain them, instead of seeing them for the first time during diligence.
Security Scanning
Security is one of the first areas to get attention, and it’s usually backed by tools rather than vague assumptions.
Platforms like Snyk, Nessus, or Qualys surface vulnerabilities, misconfigurations, and open-source licensing issues. Pair that with penetration testing, and you will get a clear view of what needs attention instead of guessing.
Data Room and Collaboration Tools
At this stage, organization matters as much as the system itself. Use virtual data rooms like DealRoom or Ansarada to keep everything in one place, including architecture diagrams, repositories, and audit reports.
When buyers can find what they need without asking, the selling process moves faster and has fewer interruptions.
Frameworks for Assessment
Once you’ve gathered all of this, the next step is making sense of it.
Simple frameworks help you step back and look at your system the way a buyer will. Where are the weak spots? What could break under scale? What would someone need to fix after taking over?
Thinking through these questions ahead of time helps you walk into diligence with clear answers instead of reacting in real time.
Complete Tech Due Diligence Checklist
At this stage, buyers are no longer looking at individual details. They’re assessing how your entire system holds up under scrutiny, how it runs, how it scales, and how easily it can be handed over.
A structured checklist helps you stay ahead of that, boosting your business’s value. It ensures you’re not reacting to questions as they come up, but already have clear answers across the areas buyers care about most.
Here’s what you need to verify before going into a live diligence process:
Architecture and Infrastructure
I start with how your system is put together and how it behaves under load. This is where I get a sense of how stable the foundation actually is.
That usually comes down to:
- Clear architecture diagrams showing how services, databases, and APIs connect.
- No obvious single points of failure in core systems.
- Evidence of how the system handles increased demand.
- A documented infrastructure setup, including a cloud environment and cost structure.
- Defined backup and recovery processes with clear uptime expectations.
Code Quality and Development Practices
From there, I want to understand how easy it is for someone new to step in and work with your code.
This means looking for:
- A codebase that’s structured consistently and easy to navigate.
- Clear ownership of different parts of the codebase, so it’s obvious who maintains what.
- CI/CD pipelines that are actively used.
- A history of regular updates and improvements, not long gaps or abandoned areas of the code.
- Clear code review processes and version control practices.
Security and Compliance
At this stage, the focus shifts to how well risk is managed across your systems. That includes:
- Recent security testing, such as penetration tests or vulnerability scans.
- Clear handling of data, storage, encryption, and access controls.
- Defined permissions across systems.
- Documentation around relevant compliance requirements.
- Visibility into past incidents and how they were handled.
IP and Licensing
You need to clean up ownership before moving forward. Focus on:
- Assign all code to the company properly, including contractor contributions.
- Eliminate conflicts with open-source licenses.
- Separate proprietary code from third-party code clearly.
- Find any past disputes or risks tied to ownership.
Team and Operations
Along with ownership, I also want to know how the system is actually run day to day. That usually means making sure that:
- There is no critical dependency on a single engineer.
- Team structure supports ongoing development and maintenance.
- Processes for deployment, monitoring, and issue handling are consistent.
- The product roadmap aligns with how the system is currently built.
Financial and Integration Readiness
Finally, everything ties back to cost and integration. Focus on:
- Clear visibility into infrastructure and tooling costs.
- Understanding how technical debt impacts ongoing spend.
- A realistic view of what integration will require post-acquisition.
- Benchmarks against similar systems or industry expectations.
This might feel like a lot of pressure because not conducting due diligence properly can lead to the buyer lowering your business’s valuation. This is where technical business brokers can help you out.
I’ve been on both sides of this. I’ve built and monetized my own online businesses, and over the last decade, I’ve worked on more than 100 deals in which technical diligence directly impacted valuation, deal structure, and buyer confidence.
If you want a clear view of how your business would hold up in a real diligence process, book a call with me.
Common Mistakes to Avoid in Technology Assessments
This is where I see a lot of deals lose momentum. The business looks strong on the surface, but the technical review starts uncovering things that should have been addressed earlier.
Here are the mistakes that come up most often:
- Incomplete Reviews: As founders, you don’t actually go line-by-line through their own code or dependencies. Then a buyer flags something basic, like unused libraries, licensing issues, or parts of the system that no one can fully explain. That shifts the tone of the conversation immediately.
- Weak or Rushed Documentation: You rely on how well your team understands the system instead of documenting it properly. Once someone external tries to follow your architecture or deployment flow, gaps show up. That leads to repeated explanations and slows the process down.
- Limited View of System Risk: You spend time improving what already performs well, but don’t look closely at failure points, bottlenecks, or edge cases. During diligence, that’s exactly where attention goes, and that’s where questions start to go unanswered.
- Gaps in Operational Clarity: You haven’t walked through how your system operates in a structured way. When buyers ask how deployments work or how failures are handled, your team takes time to answer or comes back later. That starts to affect confidence in how the system is run.
A lot of these issues don’t show up until you’re already deep in the process, which is exactly when you have the least room to fix them. If your goal is avoiding costly pitfalls and surprises, this is the work that needs to happen early, before diligence begins.
Frequently Asked Questions (FAQs)
Here’s how I resolve some common technical diligence questions founders have, based on what actually happens in deals:
How Long Does a Tech Due Diligence Process Take?
In most deals I run, the technical review itself takes about 2 to 4 weeks. That said, it’s part of a bigger timeline. Most acquisitions run 30 to 60 days, longer if the business is complex.
The pace depends on how prepared you are. When documentation is organized, and the team responds quickly, the process stays on track. When information is scattered or delayed, timelines can extend.
Who Should Lead the Technical Review?
On the buyer side, this is usually led by a CTO or Head of Engineering and sometimes a third-party firm for a deeper review, especially around security and infrastructure.
On the seller side, I recommend one clear technical owner, like your CTO or lead developer. Essentially, someone who understands the system end-to-end and can respond with confidence.
When communication is consistent and answers are clear, buyers move forward with confidence.
What Documents Do Investors Request During Tech Due Diligence?
Buyers need to clearly understand how your system is built and maintained. For this, you need to give them architecture diagrams, access to code repositories, infrastructure details, deployment workflows, and security documentation.
They also review data handling, third-party tools, and any known technical debt. When you organize these materials clearly and make them easy to access, the process moves faster, and questions stay focused.
How Can a Startup Improve Its Position Before An Acquisition?
The founders who get through diligence smoothly are the ones who prepare early. Set up your data room in advance, document your architecture and workflows, and address any known risks such as security gaps or unclear ownership.
Make sure the system can be understood and operated without relying on a single individual. When everything is clear and well-documented, buyers move through diligence with far fewer concerns.
Conclusion
A strong technical diligence process comes down to six areas: your architecture and infrastructure, code quality and development practices, security and compliance, IP ownership, team structure, and how everything ties back to cost and integration.
When these are clear and well-documented, buyers move quickly. When they’re not, it shows up in delays, deeper questioning, and pressure on the deal.
This is exactly where most founders tend to lose leverage. Mainly because they haven’t seen their own systems the way a buyer will.
I’ve built and sold my own digital businesses, and today I help founders prepare and sell tech, e-commerce, SaaS, and online service companies. My focus is on getting your business ready before it goes to market, tightening what buyers will question, and running a process that brings in multiple serious buyers.
If you want a clear view of how your business would hold up in a real diligence process, book a confidential call with me.
