Where to find co-founders: programmes, EF, CDL, networks

1. Core idea and who it's for#

Co-founders come from two kinds of places:

• high-trust, small pools: people you've worked with, your lab, former colleagues, your institute's alumni;
• low-trust, large pools: matching platforms, pre-team programmes, events, cold outreach.

The main principle is to search the high-trust pools first and use structured programmes to get trust quickly where you lack it. In deeptech the right co-founder usually has domain-specific experience, such as plant operations in chemicals, a regulatory track record in medtech, or semiconductor process engineering. Generic pools rarely produce them without deliberate targeting.

The search works like hiring with a sales funnel:

1. Define the profile from your gap test (3.01): the skills, the domain, how much risk they can take, where they're based, and what's non-negotiable.
2. Fill the funnel from several channels at once. A rough benchmark: plan for 30–60 first conversations to find 3–5 serious candidates and 1–2 trial projects.
3. Filter with work, not chat. Run a short trial project before any equity conversation (3.03).
4. Check references as rigorously as for an executive hire (3.18).

Who this is for: scientist-founders looking for a commercial or technical co-founder, and operators looking for a scientist with a technology worth building on. It also covers people choosing between pre-team programmes such as Entrepreneur First.

2. Evidence: what each channel produces#

What studies and practitioners say. A 2025 analysis of international co-founder matching found that:

• serious players prioritise people who've had success, or were early employees at very successful startups;
• using as many channels as possible gives the best results;
• the YC platform works better than its reputation suggests;
• EIR programmes are a key route by which experienced people end up joining startups as co-founders (Propolys, Polytechnique Montréal).

When YC's platform launched, it recorded more than 16,000 profiles and 33,000 matches in its first three and a half months. YC also noted that successful matches tended to be between people who lived near each other (TechCrunch).

Trial projects are the norm. YC's guidance has always been not to commit after a first conversation, and to run a defined trial project first (Round Funded). See 3.03.

3. Method: a 12-week search plan#

Week 0. Write the one-page brief. It should cover:

• the technology, with what's proven and what isn't;
• the market and the first customers;
• the gap the co-founder fills (3.01);
• the profile: domain, years of experience, risk tolerance, location;
• what you offer: founder equity range, title and role (3.05, 3.08);
• the timeline and funding status.

Share it with everyone you ask.

Weeks 1–4. Exhaust the high-trust pools.

• List 50 people you've worked with or studied with. Ask each one, "Who's the best person you know who has done X in industry Y?"
• Ask your TTO, incubator and any investors you've spoken to for operator or EIR introductions.
• Post the brief to your institute's alumni network and to relevant professional communities.

Weeks 2–8. Open the larger pools in parallel.

• Create a YC Co-Founder Matching profile with domain-specific keywords, and filter for industry experience.
• Apply to one pre-team programme or venture builder if its terms and focus fit.
• Go to 1–2 industry conferences, with a target list of attendees to meet.
• Reach out directly on LinkedIn to 30–50 people with the right profile, with a short, specific message (section 5).

Weeks 4–10. Screen and run trials.

• Screen with a 45-minute call covering motivation, risk tolerance, role expectations and deal-breakers (3.03).
• Take 2–3 candidates into paid or clearly scoped trial projects of 4–8 weeks: a customer discovery sprint, a pilot negotiation, a grant application, an investor deck.

Weeks 10–12. Decide. Check references (3.18), agree roles and equity (3.05–3.08), and sign a founder agreement with vesting (3.06, 3.07).

Track the funnel in a simple spreadsheet: source, stage, notes, next step. Expect the commercial co-founder search to take 3–6 months.

Worked example (illustrative)#

A team of two engineering PhDs building a power-electronics device for EV charging needs a commercial co-founder with automotive or utility experience.

All three trials are scoped as one-month sprints, each to secure a pilot letter of intent. The best performer is a former product manager from a Tier 1 automotive supplier, met at the conference, who closes an LOI with a charging operator. Reference checks confirm what she achieved and how she works with engineers. She joins with 25% equity on 4-year vesting with a 1-year cliff, credited from the start of the trial.

4. India / US / UK channels#

India#

• Institute networks. IIT, IISc and NIT alumni networks are the strongest pool. Many experienced operators in auto, pharma, chemicals and semiconductors are alumni and are open to being asked.
• Incubators (1.11), such as IITM Incubation Cell, SINE at IIT Bombay, FITT at IIT Delhi, C- CAMP, Venture Center and NSRCEL, run mentor and EIR networks and sometimes broker co-founder introductions.
• Entrepreneur First Bangalore is a pre-team route. Antler India and other studios exist too, so compare their terms and deeptech focus.
• Returning diaspora: Indians with industry experience abroad who want to come back are a growing source of commercial co-founders for deeptech.
• Government and industry bodies, such as BIRAC, NASSCOM's deeptech programmes and sector associations, run events where operators gather.

US#

• The deepest pool: YC Co-Founder Matching, with in-person meetups in San Francisco and New York, university venture-creation programmes and EIRs, deeptech studios, Activate and fellowship alumni networks (1.10), and sector communities, for example in biotech and climate.
• Large-company R&D alumni, from national labs, semiconductor firms or pharma, are a strong source of operator co-founders.
• Location still matters. Matches cluster geographically, so prioritise people in your hub, or be clear about remote expectations (3.15).

UK#

• Entrepreneur First London is the original pre-team programme.
• Deeptech venture builders and talent programmes pair scientists with operators or recruit founders onto theses. Examples include Deeptech Labs, Conception X and university entrepreneurship schemes such as Oxford's and Cambridge's.
• TTO and spinout investor networks maintain lists of potential CEOs and commercial founders (3.04).
• The RAEng Enterprise Hub and Royal Society entrepreneurship networks connect researchers with experienced mentors, some of whom join as co-founders.

5. Scripts, mistakes, related playbooks and sources#

Scripts#

Asking your network:

"We're spinning out a power-electronics technology for EV charging, and we're looking for a co-founder who has sold to utilities or automotive suppliers. Who's the best person you know who has done that? I'm not asking you to vouch for anyone, just to name names."

A cold LinkedIn message:

"Hi [name], I'm one of two engineers spinning out [technology] from [institute]. We've shown a 30% efficiency gain in lab tests and we're looking for a commercial cofounder with your background in [domain]. Would you be open to a 20-minute call? Here's our one-page brief."

Proposing a trial:

"Before we talk about equity, let's work together for four weeks on one concrete goal: a letter of intent from a charging operator. We'll cover expenses, and if we go ahead, your vesting starts from today."

Common mistakes#

1. Using only one channel, usually a matching platform, and getting generic software profiles.
2. No written brief, so introductions are vague and miss the domain.
3. Committing after a few conversations, with no trial and no references.
4. Chasing "big names" who won't take founder-level risk or time.
5. Leaving equity and roles vague until after someone joins (3.05, 3.07).
6. Overlooking people who are already close: a former colleague or a member of your lab who wants to switch to the business side.

Related playbooks#

• 1.10 Fellowships
• 1.11 Indian incubators
• 1.14 Accelerators
• 3.01 Do you need a co-founder?
• 3.03 Co-founder dating
• 3.04 Bringing in a business CEO
• 3.15 Co-founding across countries
• 3.18 Reference checks on a co-founder

Sources#

• Co-Founder Matching, Y Combinator
• YC co-founder matching guide 2026, Round Funded
• What do people want in a co-founder? YC has some answers, TechCrunch
• Entrepreneurs First 2026, Startup Intros
• International co-founder matching analysis, Propolys, Polytechnique Montréal (January 2025)

The worked example and the funnel ratios are illustrative. Programme terms change, so check each programme's current terms before applying. Last checked November 2026.