Your Series A investors are sending in a technical due diligence firm. You need to be ready.
Technical due diligence isn't just a code review. It's an assessment of your engineering practices, your architecture decisions, your security posture, your scalability roadmap, and your technical team's capability. We prepare the codebase and the technical documentation that helps you pass — and identifies the genuine problems before the investors do.
You have a term sheet with a technical due diligence condition. You know there are architectural decisions in the codebase that made sense at the time but will look problematic to a senior engineer reviewing the code with a checklist.
Technical due diligence firms working for Series A and B investors are looking for specific things. They're not trying to find a perfect codebase — they know startup codebases have technical debt. They're trying to distinguish between acceptable technical debt (decisions made under pressure that can be addressed with investment) and structural technical risk (architecture decisions that would require rebuilding the product to fix, or security vulnerabilities that represent regulatory or reputational liability).
The specific items that fail technical due diligence most often: security vulnerabilities (authentication bypass, unvalidated user input, exposed secrets in the codebase), poor test coverage (below 30% for critical paths), no monitoring or observability infrastructure, no documented architecture decisions, single-point-of-failure infrastructure, and a codebase that only one person understands.
The good news is that most of these issues are addressable before due diligence. Security vulnerabilities can be patched. Test coverage can be improved for critical paths. Monitoring can be added. Architecture documentation can be written. The remaining technical debt — the decisions that will require ongoing investment to address — can be documented as a known roadmap item with a remediation plan, rather than discovered as an unknown risk by the investor's technical reviewers.
The preparation work is the same whether or not you pass: you get a more secure, better-monitored, better-documented application. The due diligence preparation is the investment you should have made anyway.
A technical remediation report and documented architecture decisions that give the due diligence firm what they're looking for — and that address the genuine technical debt before it becomes a deal risk.
Security audit
Authentication implementation, authorisation enforcement, input validation, SQL injection exposure, dependency vulnerability scan (npm audit, Snyk), exposed secrets scan (truffleHog or equivalent). Critical vulnerabilities are patched as the first deliverable.
Architecture documentation
Written documentation of the system architecture: the services, the data model, the integration dependencies, the authentication system, the infrastructure topology, and the scaling model. Due diligence firms expect to see this — it signals engineering maturity.
Technical debt register
A documented inventory of the known technical debt in the codebase: what it is, why the decision was made, what the impact is, and what the remediation plan is. A documented technical debt register is significantly better in due diligence than an undocumented one.
Test coverage for critical paths
Unit and integration tests covering authentication, payment processing, and core business logic. Critical path coverage gives due diligence reviewers evidence that the core functionality is tested.
Monitoring and observability
Error tracking (Sentry or equivalent), uptime monitoring, and application performance monitoring if not already in place. An application with no production observability is a red flag.
Remediation report
A document summarising the pre-engagement state, the remediation work performed, the remaining technical debt, and the recommended engineering roadmap. This is the document you share with the due diligence firm. Built using your existing stack — this is remediating and documenting what exists, not rebuilding it.
One honest number to start.
Fixed-scope, fixed-price. The number below is the starting point — final scope is built from your brief.
A technical remediation report and documented architecture decisions that give the due diligence firm what they're looking for — and that address the genuine technical debt before it becomes a deal risk.
Three steps, every time.
The same repeatable engagement on every project. No surprises, no mystery, no billable ambiguity.
Brief & discovery.
We send you questions, then get on a call. Output: a written scope with every step, feature, and integration listed.
Build & ship.
Fixed schedule, weekly reviews. No scope creep unless you change the scope — and if you do, we reprice it transparently.
Warranty & retainer.
30-day warranty on every launch. Most clients stay on a monthly retainer for ongoing features and maintenance.
Why Fixed-Price Matters Here
Technical due diligence preparation is time-bounded by the deal timeline. The scope is the specific remediation items identified in the initial audit. Fixed scope, fixed price — and a timeline that's designed to complete before your due diligence window.
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Read moreQuestions, answered.
Four to six weeks is the minimum for a meaningful remediation. Security vulnerabilities can be addressed in 2 weeks; documentation and test coverage take 4 weeks to do properly. If you have less time, the scope is triaged to the highest-priority items.
The audit is not a guarantee — it's a significant reduction in the probability of finding surprises. If the due diligence firm identifies issues, having done a preparation audit demonstrates that you take technical quality seriously and have a process for addressing issues — which is itself a positive signal to investors.
Yes — architecture documentation, technical debt registers, and security audit reports are useful for engineering onboarding, team expansion, and ongoing technical governance. The due diligence preparation produces artifacts that are valuable beyond the fundraising process.
A technical audit, security remediation, and documentation package for a Series A-stage application typically runs $25k–$45k depending on codebase size and issue complexity. Fixed-price.
4 to 8 weeks from engagement start to a due-diligence-ready technical package.
Tell Ryel about your project.
Describe what you’re building and what outcome you need. You’ll have a written, fixed-price scope within the week.