Seed & Series A Technical Due Diligence Checklist for Startup Founders (2026)
Institutional Seed, Series A, and M&A investors evaluate five pillars during technical due diligence: (1) Architecture & Scalability without a rewrite, (2) Unbroken IP Assignment & Copyleft Open-Source Hygiene, (3) Security & Compliance Posture (SOC 2, ISO 27001, UK/EU GDPR, HIPAA), (4) Cloud & AI Gross Margin Unit Economics, and (5) Engineering Velocity & Bus-Factor Resilience. Preparing your technical data room 30–60 days before term-sheet signature prevents valuation haircuts and stalled closings.
Pillar 1: System Architecture, Multi-Tenancy & Scale Headroom
Investors do not expect a Seed or Series A codebase to look like Google—they want proof that 10x customer growth post-funding will not force a 9-month feature freeze to rewrite the platform.
- Up-to-date C4 system architecture diagram, data-flow diagram, and entity-relationship (ERD) schema
- Strict tenant data isolation (row-level security or schema isolation) verified by automated tests
- Asynchronous job queues, rate limiting, and indexed database queries with P95 latency telemetry
- Documented Architecture Decision Records (ADRs) explaining pragmatic trade-offs and known tech debt remediation
Pillar 2: Clean IP Chain & Open-Source / AI Provenance
Legal and technical diligence intersect sharply on intellectual property. A single former contractor without a signed PIIA/IP assignment—or a viral GPL/AGPL library linked into core proprietary logic—can halt closing.
- Signed IP assignment agreements covering every founder, employee, freelancer, and historical agency
- Automated Software Bill of Materials (SBOM) scan confirming zero viral AGPL/GPL license contamination
- AI governance policy documenting zero-training enterprise APIs, training-data rights, and prompt/eval ownership
Pillar 3: Security, Compliance & Cloud/AI Gross Margin Economics
Modern VCs scrutinize unit economics down to the infrastructure cost per customer and security readiness for enterprise sales.
- SOC 2 Type I/II, ISO 27001, Cyber Essentials+, HIPAA, or UK/EU GDPR controls matrix + recent pen-test summary
- Zero hardcoded secrets in Git history, enforced MFA/SSO, encrypted backups, and tested disaster recovery RTO/RPO
- 12-month AWS/GCP/Azure + LLM inference cost-to-ARR ratio proving 75%+ target software gross margin
- CI/CD deployment frequency, automated test coverage on revenue-critical paths, and zero single-engineer bus factor
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