To find a business partner for a startup, first decide who you need: an investor with money or a partner who will work in the project.
Define their role by stage — technical, marketing, financial — and prepare a concept, a financial model and an honest offer with equity.
Search professional networks and founder communities, test the partner on real work before the deal, and set out equity, vesting and exit rules in a shareholders’ agreement.
Finding a business partner is not just posting an ad.
Success depends on preparing your documents, understanding the partner’s role, writing the right listing and choosing the right platforms.
The main mistake usually happens not during the search but after it: a partner is found, equity is handed over, and nobody agrees on money, time and exit.
Below is the whole path, from deciding who you need to formalising the partnership in a Spanish SL.
Investor or partner: who are you looking for?
| Investor | Investor-partner | Co-founder partner | |
|---|---|---|---|
| Contributes | Money | Money, experience, network | Work, skills, sometimes money |
| Involvement in management | Limited to financial matters | Strategy, key decisions | Full, day to day |
| Gets | Equity or interest | Equity, a board seat | Vested equity, sometimes a salary |
| When you need one | You have a team and need money | You need money and sector expertise | The team lacks a key skill |
If you are looking for a partner, say clearly that you need someone ready to actively build the project, not just provide capital.
If what you mainly need is money, see How to find an investor for a startup.
Why investors want to see a team before the deal and how to build one without money: Can you raise investment before building a team?
There is a third option — not a partner but an employee or contractor. Equity should go to someone without whom the project will not happen and who is willing to share the risk. If a paid contractor can do the job, equity is too expensive a price.
Prepare your startup for the search
A strong candidate chooses a project as carefully as you choose them. Before you search, make sure the project is ready to present:
- A business plan (concept and roadmap): product or service; market and target audience, positioning; a step-by-step timeline; resources required; financial forecast — costs, revenue, profitability; risks and how you manage them; scaling strategy.
- A pitch deck: short and visually clear, 10–15 slides — what makes the product unique, what is in it for the partner, growth prospects.
- A financial model: scenarios, inputs and assumptions; projected revenue, costs and profit, cash flow and a forecast balance sheet for 3–5 years. For a European startup, include tax and legal costs.
- Legal documents: if the company is registered, an extract from the registry (in Spain, the Registro Mercantil). If not, the chosen legal form and jurisdiction. And a draft partnership agreement covering equity, duties and exit rules.
A partner shown only an idea mostly evaluates you. A partner shown a model and a plan evaluates the project — and the equity conversation becomes concrete.
Who exactly you need: the partner’s role and profile
What kind of partner you need depends on the startup, its stage and the founder’s own skills.
| Stage | Typical partner | What they cover |
|---|---|---|
| Idea and MVP | Technical partner (CTO) | Building the product, architecture, technology choices |
| First sales | Sales or product partner | First customers, feedback, product-market fit |
| Growth | Marketing partner (CMO), investor-partner | Acquisition channels, brand, money and network |
| Scaling | Financial partner (CFO) | Finance, reporting, funding rounds, new markets |
Partner profile:
- Skills the team lacks — development, sales, management, sector experience. A partner with the same skills as you doubles your strengths but does not cover your weaknesses.
- Personal qualities — shared values, appetite for risk, the ability to disagree and still agree.
- Time — how many hours a week they can give the project, and from when. An “evenings” partner and a full-time partner deserve different stakes.
- Financial capacity — whether they will put in money or offset it with active involvement. What investors count as founder commitment: Skin in the Game.
- Market knowledge — do they know the customers, the sector, the country you are launching in? For a project in Spain, a partner who knows the local market and language can be worth more than another developer.
Write a compelling listing
Key elements
- Clarity and professionalism. No vague wording; say exactly what you offer — equity, role.
- Startup viability. Data: market size, first results.
- Terms. Equity, the partner’s responsibilities, expected time commitment.
Listing structure
- Title with the key information. Example: “Looking for a partner (CTO) to build an AI product”.
- Project description: sector, stage, your goal.
- Needs: the skills and role you are looking for.
- Terms: equity, vesting, responsibilities, time commitment.
- Contacts: email, LinkedIn or a messenger.
A simplified example: “Looking for a technical partner (CTO) for a fintech startup. The product has been tested and early customers confirm its value.
We offer 20% equity vesting over 4 years in exchange for leading development and scaling, full time.”
You do not have to state the equity in the listing, but a range saves both sides time. How to calculate a fair stake: How to split equity between startup co-founders.
Where to look for a partner
The platform depends on who you need.
| Where | Who you will find |
|---|---|
| Specialists and business partners with a verifiable track record | |
| Wellfound (formerly AngelList Talent), Crunchbase | People from the startup world, information on projects and their teams |
| Co-founder matching — YC Co-Founder Matching, CoFoundersLab | People actively looking to join a project as a co-founder |
| Hacker News, Reddit (r/startups, r/entrepreneur) | Developers and an international founder audience |
| EU-Startups, StartupBlink, Telegram and Slack groups | The European and local startup community |
| Accelerators, hackathons, events (in Spain: South Summit, 4YFN, Lanzadera, Barcelona Activa) | People you can see in action |
| Former colleagues, classmates, customers | People you have already worked with |
The internet gives you reach, but the best partnerships more often come from people you have already worked with.
Move an online introduction into a shared task as quickly as possible.
How to test a partner before the deal
- A joint task. Give them a small real project for 2–4 weeks: a prototype, research, first sales. It is the best test of skills and working style.
- References. Talk to people they have worked with.
- Hard conversations up front. Discuss what people later fight about: how much time each gives the project, when salaries start, who decides what, what happens if one wants to leave, on what terms to sell the company.
- Values and goals. Is one of you building a business for life and the other building to sell in three years? Better to find out before signing.
- Vested equity. Even after testing, equity is best earned over time, so a wrong choice does not cost part of the company.
Legal aspects: formalising the partnership in Spain
- Company form. A startup with several founders in Spain usually uses an SL (sociedad limitada). The form affects taxes, members’ rights and the ability to raise investment.
- Shareholders’ agreement (pacto de socios). Equity, vesting, duties and time commitment, who decides what, exit rules (good / bad leaver), right of first refusal, non-compete, dispute resolution.
- Intellectual property. Rights to the product, code and brand must belong to the company, not to an individual founder. If the partner started development before joining, the transfer of rights is documented separately.
- Status of a working partner. A member who works in an SL and controls it must generally register in Spain as a self-employed company member (autónomo societario). Control always exists with at least half of the capital and is presumed with at least a third, or at least a quarter if they manage the company (art. 305.2(b) of the General Social Security Act). Factor this in when allocating equity and roles.
- Taxes. How partners’ salaries and dividends are taxed depends on their tax residence — a question for a tax adviser before signing.
Mistakes when looking for a partner
- A partner of convenience — a friend or relative without the skills you need.
- Equal splits by default, ignoring contributions and time commitment.
- Equity without vesting: the partner leaves after six months and takes a quarter of the company.
- Verbal agreements: a year later everyone remembers them differently.
- Looking for a partner instead of an employee: giving equity for something you could have paid for.
Frequently asked questions
Where can you find a business partner for a startup?
On professional networks (LinkedIn, Wellfound), co-founder matching services (YC Co-Founder Matching, CoFoundersLab), founder communities, accelerators, hackathons and events, and among former colleagues and customers.
How is a partner different from an investor?
An investor puts in money and has limited involvement in management. A partner contributes work and skills, is involved every day and receives equity, usually with vesting.
How much equity should you offer a partner?
It depends on their contribution in money, work and skills, their time commitment and the project’s stage. Equity is calculated from contributions rather than split equally by default, and secured with vesting — usually 4 years with a 1-year cliff.
How do you test a partner before the deal?
Give them a joint task for 2–4 weeks, talk to their former colleagues and discuss the hard questions in advance: time, salary, decisions, exit and selling the company.
How do you formalise a partnership in Spain?
Usually through an SL: the partner becomes a member of the company, and equity, vesting, roles, exit rules and IP rights are set out in the shareholders’ agreement (pacto de socios) and the articles.
Key points on finding a business partner
- First decide who you need: an investor, an investor-partner, a co-founder — or simply an employee.
- The partner’s role depends on the stage: a CTO for the MVP, sales and marketing for growth, a CFO for scaling.
- Prepare a concept, a financial model and an honest offer with equity and vesting.
- Turn online introductions into joint work quickly.
- Set out equity, vesting, roles and exit in a pacto de socios, and keep IP with the company.
Sources
- General Social Security Act (Royal Legislative Decree 8/2015) — art. 305.2(b).
