Rubén Domínguez Ibar

founder The AI Corner | scout a16z speedrun

United States

About

Industrial Engineer turned tech early stage investor and builder of a media company. I’ve worked as a VC backing early and late stage startups, and now invest globally at pre-seed as a business angel, helping founders with distribution and go-to-market. I also write and run two of the leading tech newsletters for founders: ▪ The VC Corner (100k+ on Substack, 130k+ on LinkedIn): Actionable VC insights, fundraising strategies, and curated resources → Ranked #4 tech newsletter globally on Substack → Fastest-growing tech newsletter on Substack → Largest Substack in any category created by a Spaniard ▪ The Founders Corner (40k+ on Substack, co-written with Chris Tottman): Real-world tips and tactics from top founders

Experience

  • Founder at The VC Corner
    2024 - Present · 2 yrs 7 mos

    Helping founders raise capital, stay ahead, and truly understand venture capital. I manage The VC Corner, a newsletter built to make startup life easier for founders and CEOs. With sharp insights, fundraising advice, and the best resources to use day-to-day. • 110,000+ subscribers (50% US) • 1.5M+ monthly reads • #5 biggest Substack tech newsletter in the world • #1 fastest growing tech newsletter on Substack • Largest Substack newsletter in any category ever created by a european Read by founders, CEOs and startup operators who want actionable content and resources that actually help

  • Scout at Andreessen Horowitz
    Aug 2025 - Present · 1 yr

    Investing in pre seed startups and helping them get into a16z Speedrun, Andreessen Horowitz’s accelerator program: • Up to $1M investment • $5M+ in free credits • Access to mentorship and founder community If you’re building something bold, reach out with a short blurb: value proposition + team + traction

  • VC Investor at Business Angel
    2024 - Present · 2 yrs 7 mos

    Investing globally in pre-seed startups, helping founders with distribution and visibility. Portfolio: • Replit (Coatue, a16z, Khosla, YC) - Turn your ideas into apps • HappyRobot (a16z, YC, Base10) - Intelligence that runs your operations • Murphy (Northzone, Seedcamp, Lakestar) - AI Powered Debt Collection • Pally (Pioneer Fund, YC, Founders Inc) - Personal relationship management platform • Throxy (YC, Base10) - Vertical AI agents that automate the full sales funnel • Azimov (a16z speedrun) - Building the missing half of the digital world • Cubic (Peak XV, YC) - AI powered code review platform • Nozomio (LocalGlobe, CRV, YC) - Context augmentation for agents • QFEX (General Catalyst, YC) - The 24/7 exchange for traditional financial markets • Bloom (YC, Moonfire, Pioneer Fund) - Build and share mobile apps in seconds • Minerva Intelligence (YC) - AI to replace SMB bookkeepers • Altan (JME, 4Founders, VentureFriends) - Create projects by talking to AI • Novoflow (YC) - AI employees that automate medical ops for clinics • YouShift (YC) - The operating system for healthcare staffing • Emblematic AI (Passion Capital, Caesar VC, K Fund, PnP) - Transforming Financial Ops with AI • Klavis AI (YC) - Open source MCP integrations for AI applications • Clova (Founders Inc) - Cursor for video editing • Cua (Peak XV, YC) - Docker for Computer-use Agents • Flai (First Round, YC, Liquid 2, SV Angel) - Turn every call into a sale with AI that never misses a lead • Veritus Agent (YC) - AI agents for the consumer lending industry • Keystone (YC) - Your team's on-call AI engineer • Trace (YC) - Workflow automation that routes tasks to humans and AI • OrangeSlice (YC) - AI agents that find you customers who already want to buy • Hera (YC) - Your AI Motion Designer • Motives (YC) - Consumer focus groups run by AI • Floot (YC) - Vibecoding platform for non-coders who build serious apps ...

  • Mentor at IE Business School
    Jul 2025 - Present · 1 yr 1 mo

  • Co-Founder at Compound Podcast
    2025 - Present · 1 yr 7 mos

    Conversations with the smartest founders & investors in tech: Index Ventures, NFX, WeWork, Amplitude, Substack, Perplexity, Synthesia & more