You just pitched on Demo Day. The round is closing. Investors are in. Now what?
For 196 companies in the YC W26 batch, the next 30 days are about one thing: shipping. And that almost always starts with your web presence.
We work with early-stage startups, many of them YC-backed, and we've seen the same pattern play out dozens of times. Here's what you actually need to build after Demo Day — and in what order.
Week 1-2: Your Website Is Your First Product
Before you hire, before you scale, before you do anything else — you need a site that converts.
Your Demo Day landing page was built to impress investors. Now you need one that impresses customers. These are different things.
What a post-Demo Day website needs:
- A clear value proposition above the fold (not your pitch deck tagline — your customer-facing one)
- Social proof: YC badge, investor logos, any early traction metrics
- A single, obvious call to action (waitlist, demo request, or sign-up)
- Fast load times — under 2 seconds on mobile
- SEO fundamentals from day one (most founders forget this and regret it 6 months later)
You don't need a 20-page site. You need 3-5 pages that actually work: home, product/features, pricing, about, and contact.
The "We'll Do It Later" Trap
Here's what we hear constantly: "We'll build a real website after we ship the product."
The problem? By the time the product ships, you've lost 3-6 months of organic traffic, content indexing, and brand building. Companies that start publishing content early can have 50+ indexed pages by the time they launch. Everyone else starts from zero.
Your website isn't a nice-to-have. It's the foundation of every channel: paid ads need landing pages, PR needs somewhere to link, sales needs case studies, recruiting needs an about page that doesn't look like it was built in 2019.
What to Build (and What to Skip)
Build now:
- Marketing site with Next.js (fast, SEO-friendly, scales with you)
- Blog with 3-5 foundational posts targeting your core keywords
- Analytics (Plausible or PostHog — set up tracking before you have traffic, not after)
- Basic email capture and CRM integration
Build in month 2-3:
- Customer dashboard / app (if SaaS)
- Interactive demos or product tours
- Case studies from early customers
- Documentation site
Skip entirely (for now):
- Complex animations and micro-interactions
- Custom illustration systems
- Multi-language support (unless your market demands it)
- Anything that takes more than 2 weeks to build
The Speed Advantage
Post-Demo Day, speed is everything. Your competitors are building too. The difference between shipping your site in 1 week versus 6 weeks compounds over time.
This is exactly where working with a specialized dev shop pays off. We've shipped production marketing sites for YC startups in under 10 days — because we've built this exact stack before and we use AI-assisted development to eliminate the repetitive parts.
The math is simple: if your founding engineers spend 3 weeks building a marketing site, that's 3 weeks they're not building the product. If an outside team ships it in 1 week while your engineers stay focused, you've gained a net advantage.
Tech Stack Recommendations for YC Startups
After building for dozens of startups, here's what we recommend in 2026:
- Framework: Next.js 15 with App Router — server components give you SEO out of the box
- Styling: Tailwind CSS — fast to build, easy to maintain, your future hires already know it
- CMS: MDX for blog content, Sanity or Payload for anything more complex
- Hosting: Vercel — zero-config deployments, edge functions, analytics built in
- Analytics: PostHog or Plausible — privacy-friendly, founder-friendly pricing
This stack scales from "just raised our seed" to "Series B and growing." You won't need to rewrite it.
How Much Does This Cost?
A high-quality marketing site for a post-Demo Day startup typically runs $2,500-$6,000 depending on complexity. That includes design, development, copywriting assistance, and SEO setup.
Compare that to the cost of a founding engineer's time for 3+ weeks, or the opportunity cost of launching without a proper web presence. The ROI is pretty clear.
Check our pricing page for specifics on what's included at each tier.
The Bottom Line
Demo Day gets you funded. What you build next determines whether that funding turns into traction.
Your website is the first thing investors, customers, journalists, and future hires will see. Make it count.
If you're in the W26 batch and need to ship fast, we'd love to help. We specialize in exactly this: high-quality Next.js sites, built quickly, for startups that don't have time to waste.