The SaaS Startup CTO Checklist: 80+ Things to Get Right Before You Scale (2025)
The Checklist Every First-Time CTO Needs
Whether you're the CTO, the first engineer, or a technical co-founder at a pre-seed startup, this checklist covers everything you need to think about when building a SaaS application. Based on the open-source SaaS CTO Checklist, expanded with practical guidance for each item.
This isn't theory — it's a pragmatic, opinionated list of decisions you'll need to make. Skip any of these and you'll pay for it later with technical debt, security incidents, or team dysfunction.
Before You Start Building
The two most important decisions you'll make before writing a single line of code.
Choose boring technology
Focus on tech that helps you build your product, not keeping up with fads. New tech popularity is fleeting. PostgreSQL, Rails, Django, Express, React — these are boring and battle-tested. Your competitive advantage is your product, not your stack.
Read: Dan McKinley's "Choose Boring Technology" — the most important technical essay for startup CTOs.
Have a point of view on how you work, not just what you work on
Document your engineering philosophy early. Opinions on code style, deployment cadence, testing strategy, and communication norms prevent endless debates later. Ruby on Rails' Doctrine is a great example of this — whether or not you use Rails.
Tools
The foundational tools that your entire engineering workflow will run on.
GitHub — source control, code review, wiki, project management all in one place.
Pick a PaaS you're comfortable with — minimal DevOps and easy deploy beats cost efficiency or performance at this stage. Heroku, Render, Railway, Vercel, or Fly.io.
Set up a CDN — serve static assets from a CDN instead of your web server from day one. CloudFront, Cloudflare, or Fastly.
Start a wiki — use GitHub for it. Document decisions, architecture, and onboarding from the start.
Set up CI — require CI to pass for PRs to merge. Enforce code style as part of CI. This is non-negotiable even for a team of one.
Architecture
The structural decisions that are hardest to change later. Get these right early.
Pick a lane: SSR vs CSR, Monolith vs Microservices
At a startup, the answer is almost always: monolith. Microservices are for scaling problems you don't have yet. Start with a monolith you understand deeply, then extract services when specific components need to scale independently.
User auth and policy-based access from day one
Start with password-based auth. Plan for MFA/2FA and SSO — you'll need both sooner than you think, especially for enterprise customers. Enforce authorization checks at every layer.
Build an "Admin" user from day one
You will need admin capabilities immediately — for debugging, for customer support, for data management. Don't wait until you have 100 customers to build admin tooling.
Design data models for teams/groups from the start
Even if you're building for individual users today, you will eventually need multi-tenant team support. Retrofitting multi-tenancy is one of the most painful migrations in SaaS. Design for it now.
⚠️ The Marketing Site Trap
If your marketing site is built within your app, you become the bottleneck for growth and marketing. Every landing page, every blog post, every SEO change requires engineering time.
Do: Run your app on app.yourdomain.com from day one. Separate marketing site on the root domain.
Don't: Use naked domains for hosts — they're inflexible when migrating between services.
More Architecture Essentials
Plan for domain/subdomain changes in the future
Plan for an API — you'll eventually need one
Set up servers with repeatable code (IaC)
Automate DB backups and regularly test restores
Maintain a staging environment
Set up uptime monitoring with notification processes
Never restore or run production data in non-production environments
Code Practices
The engineering practices that compound over time — for better or worse.
☐ README = Dev Setup
Your README should describe steps to set up the dev environment from scratch. Keep it always up-to-date. If a new engineer can't get running in 30 minutes, fix it.
☐ Style Guide from Day 1
Adopt a style guide immediately. Use linters to enforce it. This eliminates style debates in code reviews and makes the codebase feel consistent as the team grows.
☐ Tests from Day 1
Start adding spec tests from day one. Not 100% coverage — but the critical paths. Tests are the foundation that lets you refactor confidently later.
☐ Error & Performance Reporting
Set up runtime error reporting (Sentry, Bugsnag) and real-time performance analytics. You can't fix what you can't see.
☐ Logging & Exception Guidelines
Document guidelines for logging and exception handling. Inconsistent logging makes debugging a nightmare at 3 AM.
☐ Audit Trail
Track changes to records at the database level for auditing and versioning. Enterprise customers will ask for this, and compliance will require it.
☐ Code Review Process
Define and document expectations for code reviews. Good reviews catch bugs, share knowledge, and maintain quality. Bad reviews create bottlenecks and resentment.
☐ Seed Your Dev Database
Seed development databases with realistic data via code. Every engineer should be able to spin up a working environment with meaningful test data in minutes.
Remember: Early code will likely hit product limitations before performance or scalability becomes an issue. Focus on shipping features and finding product-market fit — not premature optimization.
Engineering Team
Building the team that builds the product.
Hanlon's Razor
Never attribute to malice that which is adequately explained by ignorance or lack of knowledge. When a teammate makes a mistake, assume the system failed them — not that they were careless or malicious.
Always be recruiting
Even when you're not hiring, build relationships with talented people. The best hires come from networks you've built over months or years — not from job postings you run for two weeks.
Define engineering levels early
Once you have at least one other engineer, define levels. Clear expectations prevent compensation disputes, promotion confusion, and "what does senior even mean here?" conversations.
You'll need QA earlier than you think
Founders consistently underestimate when they need dedicated QA. If you're spending more than 20% of your time on manual testing and bug reproduction, it's time.
Choose: manage or code
When you're no longer effective managing the team, hire an engineering leader who is 10x better than you at management. Doing both management and coding results in poor performance of both.
Decide on remote early
Remote teams give you a larger talent pool but have unique management challenges. If remote, hire for skill and autonomy. Decide your "type" of remote: fully async, hybrid, or timezone-overlapping.
Product Principles
The product thinking that separates successful SaaS from feature factories.
Use feature flags from the start
Release new features behind flags and selectively enable them. This lets you test with specific customers, do gradual rollouts, and instantly kill broken features without a deploy.
Make your users more awesome — not your product
Don't ask "how can we make this feature cooler?" Ask "how can we make the user better at their job?" Every feature should make the customer more capable, not your product more impressive.
Customer solutions are usually wrong
When a customer says "build me X," dig into the why before weighing the how. The underlying need is usually legitimate — but their proposed solution is rarely the right one.
🚨 The One-Customer Feature Trap
Never implement a feature just for one customer. It will hurt you more in the future than it helps in the short term.
Ensure existing customers want a feature before building it. Potential customers always want the moon — rarely will "just one more feature!" start landing customers. Choose features many leads want, not just a few.
Exception: Paid/sponsored features, which should factor in maintenance and support costs.
More Product Essentials
Use analytics to make decisions — look for answers in data, not opinions
Build reporting features — database queries will eventually need to become customer-facing reports
Support deep links — your users and support staff will thank you
Have a product vision — passing on customers whose needs don't fit your vision is painful but pays off long-term
Aim for "simple" — simple is not easy, but it's what customers need. The craft is doing the hard work of figuring out complexity to make usage simple
Support
Support isn't a cost center — it's your best source of product insight.
☐ Admin Interface from Day 1
You need to see what customers see, manage data, and debug issues. Build it early — you'll use it every day.
☐ Impersonate Feature
Let admins see exactly what a customer sees. This alone will cut support ticket resolution time in half.
☐ Status Page
Set up a public status page to communicate application health. Customers will check it before emailing you.
☐ Engineers on Support Rotation
Rotating engineers through support builds empathy — including you and other co-founders. Engineers who talk to customers build better products.
☐ Support Ticketing from Day 1
Don't let support requests live in Slack DMs or email threads. Use a ticketing system from day one — even if it's just you answering every ticket.
☐ Define Supported Browsers
Document supported browsers from day one. If you plan to support IE/legacy browsers, ensure the team can actually test and debug in them. Use caniuse.com.
Security & Compliance
The items that feel optional until they aren't — usually right before your first enterprise deal.
Go through the SaaS CTO Security Checklist
Sqreen's SaaS CTO Security Checklist is the gold standard. Work through it systematically — don't just skim it. Security breaches at the startup stage can be company-ending.
Prepare enterprise security assets
Enterprise customers will ask for security questionnaires, SOC 2 reports, penetration test results, and data processing agreements. Prepare a set of shareable assets before the first enterprise sales call.
Run security analysis tools
Run static code analysis security tools for your frameworks. Look into third-party pen testing sooner than you think — vulnerabilities compound when left unchecked.
Know your top 3 compliance standards
Get familiar with the top 3 compliance certifications in your industry (SOC 2, HIPAA, GDPR, PCI-DSS, ISO 27001). Create a skeleton plan for what it would take to achieve each one.
The CTO's Miscellaneous Survival Kit
☐ Find a mentor
Mentor someone and find someone to mentor you. Within or outside your company. The best CTOs are perpetual learners and teachers.
☐ Join a CTO community
Join a community of CTOs and technical leaders. The problems you're facing have been solved by someone else — find them.
☐ Balance big and small work
In your day-to-day, balance big projects with small enhancements and bug fixes. All big projects and no maintenance creates debt. All maintenance and no big swings creates stagnation.
☐ Group email for external services
Use a group email address for all external service accounts. Use your password manager's sharing feature so access doesn't rely on any single person. All service payments on a company credit card.
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