How do you find a technical co-founder in the UK?

Key facts

• As of November 2026, YC Co-Founder Matching is free and lists about 2,900 active profiles in London, the third largest city on the platform after San Francisco and New York. (Source: Y Combinator, Co-Founder Matching)
• Entrepreneur First matches individuals into founding teams from London, Bangalore and San Francisco, with an equity-free grant while they are still ideating and up to $250K of investment once they form a company. (Source: Entrepreneur First)
• Antler's UK residency runs from its London offices with the goal of forming complementary founding teams, and Antler states that it does not invest in solo founders. (Source: Antler, UK residency)
• Conception X's nine-month Venture Scientist 100 fellowship supports about 100 PhD founders a year; applications for its spring 2027 cohorts close on 6 December 2026. (Source: Conception X)
• Catalyst in Northern Ireland has replaced its Co-Founders programme with Co-builders, which is open to anyone over 18 and carries forward idea generation and team formation. (Source: Catalyst, Co-builders)
• Companies House shows any UK company's current and resigned officers free of charge, so a prospective co-founder's past directorships can be checked. (Source: GOV.UK, Get information about a company)
• The UK's Global Talent visa for digital technology, endorsed by Tech Nation, is open to developers, engineers and data scientists who can show they are leaders or potential leaders, with no job offer needed. (Source: GOV.UK, Global Talent visa: digital technology)
• Dr. Dulan Dias joined Tellme AI as founding engineer in June 2025, became CTO in December 2025 and was made a co-founder in June 2026. (Source: Journey)

Definitions

Talent investor

An investor that backs individuals before they have a company or a co-founder, and helps them form teams. Entrepreneur First and Antler both work this way in London.

YC Co-Founder Matching

A free platform run by Y Combinator on which founders create a profile, see suggested matches and invite each other to connect, with or without an idea.

Venture creation programme

A programme that forms new companies from people rather than funding existing ones, often by matching researchers or professionals into teams. Conception X runs one for PhD students.

Trial project

A short, scoped piece of real work that prospective co-founders do together before agreeing equity, to see how they decide, build and disagree.

Where should you look first?

Look first among people who have already seen you work. A former colleague, classmate or collaborator brings something no platform can: evidence of how you both behave under pressure. Strong engineers are rarely looking for a co-founder at the moment you are, so the best candidates usually come through introductions rather than listings.

• List every engineer you have worked or studied with, and ask each one for advice on the problem, not for a commitment.
• Ask former managers, investors and founders you know who the best engineer they ever worked with was.
• Write publicly about the problem and what customers have told you; technical people respond to specifics.
• Look at engineers already working near your problem: open-source maintainers, meetup speakers and people writing about it.

Which UK programmes and platforms help?

As of November 2026, each route below exists and does what the table says. Terms change, so check the current details before you apply.

Universities, PhD programmes and research labs

For deep tech and AI, universities are often the best place to find a technical co-founder, because that is where the people with the rarest skills are still deciding what to do next. Ask the enterprise team at nearby universities which events are open to alumni and outsiders, and look at computer science and engineering societies.

For research-heavy ideas, look for PhD students and postdocs. As of November 2026, Conception X is taking applications for its spring 2027 cohorts until 6 December 2026. Researchers bring depth; check that they want to build a product and sell it, not continue the research under another name.

From practice: Dr. Dulan Dias founded EchonLabs in Colombo in 2017 and bootstrapped it from a university boarding room to a team of 60+, through to its acquisition in 2026. Universities give people time to build together before anyone has a salary to lose.

How do you approach a technical person about co-founding?

Approach them with the problem and the evidence, and ask for their judgement before you ask for their commitment.

1. Lead with the problem: who has it, what they do today, what they have told you and anything they have paid.
2. Say what you bring and what is already done: customers, domain expertise, funding, a prototype.
3. Ask for their view of the hardest technical question in the idea. Good engineers are drawn to interesting problems, and their answer is your first look at their judgement.
4. Say early that you are looking for a co-founder, not a contractor.
5. Be straight about money: how long you can both go without salaries and what you plan to raise.
6. Expect several conversations before either side decides; questions to ask a technical co-founder lists what to cover.

How do you test the fit with a trial project?

Before agreeing equity, work together on something real for a few weeks: a scoped piece of the product, a customer pilot or a technical test of the riskiest assumption. The output matters less than seeing how you decide, disagree and recover when something goes wrong.

1. Agree a goal you can both judge, such as a prototype tested with a handful of users or a working integration with one customer's data.
2. Agree in writing who owns what is built during the trial, so nobody argues about it later.
3. Split the work so each of you depends on the other at least once.
4. Hold a frank review at the end: what went well, what frustrated you and whether you both want to continue.

Working first, founder status second

A trial does not have to be short. Some of the strongest partnerships start as a job and become a founding partnership once both sides have seen the work.

From practice: Dulan joined Tellme AI as founding engineer in June 2025, became CTO in December 2025 and was made a co-founder in June 2026. A year of building the product came before the co-founder title. Not every partnership needs that long, but the order, working together first and agreeing founder status afterwards, is a sound one. Technical co-founder equity explains how to treat a co-founder who joins this way.

What are the red flags?

The red flags are signs that someone wants the status of a co-founder without its commitment or accountability:

• They want a large stake before doing any work, or equity with no vesting.
• They want contractor rates and founder equity, with no date for committing full time.
• They cannot explain systems they built before, what went wrong and what they would change.
• They resist assigning their code and other IP to the company.
• They show no interest in customers and talk only about the stack they want to use.
• Their story does not match their record. Companies House shows past directorships for free; several dissolved companies are not a red flag on their own, but evasiveness about them is.
• They will not say how many hours they can give each week.

Frequently asked questions

Sources

1. Y Combinator, Co-Founder Matching
2. Entrepreneur First
3. Antler, UK residency
4. Conception X
5. Catalyst, Co-builders
6. London Tech Week
7. GOV.UK, Get information about a company
8. GOV.UK, Global Talent visa: digital technology