Co-founder Jobs - March 2026
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AI startup (stealth)
AI Engineer
Posted 3 months, 2 weeks ago
Early-stage stealth AI startup building an AI system aimed at disrupting the SaaS market. Project is ~1 week old with test customers onboarding soon. Plan: release an open-source core, build a large community, and scale quickly. Seeking a co-founder with foun…
Roles
Tech stack
Location
Remote, EU-based
Compensation
No significant funding yet; potential to raise approximately €250,000 via public funding without giving up equity. Early-stage co-founder/engineer role; compensation not specified and likely includes equity and high upside rather than a defined salary.
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Positron
Co-founder
Posted 5 months, 2 weeks ago
Equity-only co-founder role at a bootstrapping startup in South Korea building social-decision and social-finance technology. The team is developing MuTate (a music visualizer) and in-house machine-learning approaches that avoid back-propagation to enable sma…
Roles
Tech stack
Location
South Korea
Compensation
Equity-only co-founder position. Salary-only candidates can apply with a resume labeled "Salary only" to be considered later; primary compensation is equity and proportional participation in company rewards.
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Phrasing.app
Founding Engineer
Posted 6 months, 2 weeks ago
Phrasing is a language learning application optimized for learning and maintaining multiple languages, and designed to take you all the way to fluency and beyond. It's the professional language learning application for serious learners. It's built with Elixir…
Roles
Tech stack
Location
Remote (Europe only)
Compensation
Paid via revenue share and equity; very early-stage startup with some revenue share; no guaranteed salary mentioned.
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Silk Hedge Fund
Founding Member
Posted 6 months, 3 weeks ago
Silk is a fully autonomous, full stack AI hedge fund that utilizes large language models to orchestrate the complete spectrum of hedge fund operations. We are building a system for truly autonomous wealth generation that replaces traditional investment workfl…
Tech stack
Location
New York, NY
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Silk Hedge Fund
Co-founder
Posted 7 months, 2 weeks ago
Silk is a fully autonomous, full-stack AI hedge fund using large language models to orchestrate the full spectrum of hedge fund operations — quantitative research, technical analysis, trade execution, position management, and portfolio oversight. The design t…
Roles
Tech stack
Location
New York, NY
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Phrasing.app
Co-founder
Posted 7 months, 2 weeks ago
Phrasing is a bootstrapped language-learning startup (launched, paying users) seeking a co-founder based in Europe to eventually take over the backend Elixir codebase. No experience required; looking for passionate, talented candidates. Contact via hn@phrasin…