CapStack
A full-stack fundraising platform that started as a weekend experiment and ended up powering MyRoomie's actual €1M Series A round. When your own money is on the line, you build different.
Real-World Battle Test: MyRoomie's €1M Series A
Series A Success
Raised €1M at €1.5M pre-money valuation using this platform
User Traction
Active users generating €22,999 ARR with 104% YoY growth
Investor Pipeline
Active investors from Tier 1 VCs to strategic angels
Live Platform
Production system handling real investor data and money
Platform Capabilities
Features battle-tested with real money and real investors
Automated Reporting
Financial dashboards that update automatically - no more manual investor updates
Time Saver
AutomationDocument Management
Version-controlled data rooms with access logging and engagement analytics
Enterprise Grade
Data RoomWhy We Built This
Problems with Existing Tools
- AngelList: Works for Series C, less great for early-stage
- Generic platforms: Your breakthrough insights become "Technology: Yes"
- Email chaos: "Did they download the deck? When? Did they read it?"
- Data rooms: Either Dropbox folder or enterprise overkill for €500/month
Our Approach
- Every feature exists because we needed it during actual fundraising
- Real-time investor activity with granular access control
- Automated workflows without managing servers
- Complete audit trail - every interaction logged
Technical Implementation
Multi-Tenant SaaS Architecture
ShippedProper Row Level Security in PostgreSQL - when dealing with fundraising data, 'oops, wrong company's data' isn't an option
PostgreSQL RLS, every query automatically scoped to organization
Real-Time Everything
ShippedLive investor activity tracking with Supabase subscriptions - know exactly when someone's looking at your materials
Supabase real-time subscriptions, WebSocket-free implementation
Smart Data Room
ShippedGranular access control, version tracking, and real-time notifications for investor engagement
Document analytics, access patterns, engagement scoring
Type Safety Throughout
ShippedGenerated TypeScript types from database schema - catch bugs at compile time, not with investor data
Database schema → TypeScript types automatically
Technology Stack
Frontend
- Next.js 15 App Router - Server Components for faster loading
- React 19 - Concurrent features for smooth UX
- TypeScript strict mode - Catch bugs at compile time
- shadcn/ui + Tailwind - Rapid UI development
- Radix UI primitives - Accessibility without headache
Backend & Database
- Supabase PostgreSQL - PostgreSQL with batteries included
- Row Level Security - Multi-tenancy done right
- Real-time subscriptions - Live investor activity
- Edge Functions - Serverless with zero cold starts
- Generated TypeScript - Database schema → types
Dev Experience
- pnpm - Faster, more efficient package management
- Conventional commits - Clean git history
- ESLint + Prettier - Code quality without thinking
- Supabase CLI - Local development mirrors production
What Actually Worked During Fundraising
Financial Transparency
- Live revenue dashboards (no more 'let me check and get back to you')
- Unit economics breakdown with real data
- Growth projections with conservative/optimistic scenarios
- Burn rate and runway calculations that update automatically
Investor Experience
- Each investor gets their own portal with conversation history
- Real-time notifications: 'Sarah from VC Fund downloaded your cap table'
- Document versioning: 'Everyone's looking at the latest pitch deck'
- Meeting notes and follow-up tracking in one place
Founder Sanity
- Automated investor updates (write once, send to everyone)
- Pipeline tracking (where each conversation stands)
- Document analytics (which slides investors spend time on)
- Term sheet comparison and negotiation tracking
Current Status & Access
Available Now
- • Production deployment handling real fundraising rounds
- • Multi-tenant architecture supporting multiple organizations
- • Real-time investor engagement tracking
- • Automated document management and analytics
- • Full audit trail for compliance
Who's Using It
- • MyRoomie (€1M Series A completed)
- • Several other startups in active fundraising
- • Angel investors managing their deal pipeline
- • White-label options for accelerators/VCs
Not a Traditional SaaS
This is an entro314 labs experiment that became useful. We're more interested in helping founders succeed than building a billion-dollar subscription business.