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Building an appointment booking system — how should we split equity and workload with a designer co-founder?

OOnur T***MemberCommunity member
Joined
Sep 2023
Message
1
#1

We decided to build a cloud-based appointment and calendar management system for beauty salons, dietitians and private clinics. I am a senior backend and database developer, and my friend is a UI/UX designer. Right now, we both plan to dedicate 15-20 hours a week alongside our day jobs to release the first working version within 6 months.

We haven't incorporated yet but we want to sort out the equity split right from the start. My friend wants to be involved not just in design but also in marketing later on, and suggested a 50/50 split. However, it seems like deploying the software server maintenance, SMS integrations, and ongoing customer requests will all fall on my shoulders long-term.

How should we balance equity copyright, and code ownership between us? If one of us leaves the project down the road, who gets to keep the designs or the codebase?

PPerihan T***New memberCommunity member
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Jun 2026
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203
Most Helpful#2

Short answer: You should determine the equity split based on operational obligations and a time-based vesting schedule after launch, not just the initial build effort. You must sign a written agreement upfront stating that design and software IP belongs to the joint venture, not to individuals.

The classic mistake in new ventures is starting with a 50/50 split without a vesting schedule. If your designer friend puts in 5 hours a month after the product launches while you're grinding 25 hours a week fixing server crashes, client integrations, and database tuning, the partnership will fall apart in six months. That's why you need a 3-year vesting schedule with at least a 1-year cliff. Anyone who leaves before the one-year mark shouldn't be entitled to any equity or profit share.

Put these steps into a written agreement to protect your rights: 1) Document that all UI files, source code, and branding belong exclusively to the venture, 2) If the designer takes on marketing, tie this to concrete deliverables, like content output or number of businesses pitched, 3) Establish a valuation formula upfront detailing how the remaining founder can buy out the departing partner's vested shares if someone leaves.

JJülide A***MemberCommunity member
Joined
Jul 2025
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75
#3

Draft a partnership agreement between yourselves before officially incorporating. Clearly state in the contract that all economic rights to code and designs created under intellectual property law—specifically adaptation, reproduction, and distribution rights—are transferred to the project. If you don't document this transfer, a departing partner can later claim 'you can't use my designs.'

İİlker T***Member
Job title
Co-founder
Sector
Security services
Organization type
20-person company
Joined
Apr 2022
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73
#4

A designer saying 'I'll handle marketing too' is usually an empty promise. Selling booking software once it's built means going door-to-door to hair salons and clinics. Are they actually going to hit the pavement and do direct sales, or just post a few graphics on social media and call it a day?

SSinan B***Expert
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Product Manager
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Media and publishing
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two-branch business
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Apr 2025
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223
#5

Three of us started a similar booking software project. By month 5, the other dev burned out and quit. Because we had no vesting agreement, he walked away with 33 percent of the project, and we had to shut it down since we couldn't bring in new investors.

EErcan T***Member
Job title
Chief Technology Officer
Sector
Electrical-electronics
Organization type
regional distributor
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Jan 2023
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1

Doki · Vulnerability scanning · 2024

#6

You could start with a profit-sharing model instead of equity. Set a fixed fee for the initial design work, then offer a commission percentage based on net revenue brought in through marketing. Once you incorporate, you can distribute equity based on actual contribution.

PPerihan Ş***MemberCommunity member
Joined
Apr 2024
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1
#7

Built a vet booking dashboard with a former colleague once. Once the design was done he thought his job was finished. I was up at 3 AM fixing broken calendar syncs while he was on vacation. Giving him half ate away at me, and it ruined our friendship in the end.

PPerihan K***Member
Job title
Front office accounting
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Furniture manufacturing
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regional distributor
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Nov 2025
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45
#8

To safeguard intellectual property, it is essential to include confidentiality, non-compete, and irrevocable assignment of economic copyright clauses in your agreement to prevent future legal disputes.

MMeryem U***Member
Job title
Secretary
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Packaging
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family business
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Nov 2023
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300
#9

50-50 is a terrible idea from day one. it leaves decision-making completely ambiguous and as soon as you hit a roadblock it turns into a fight. btw make it at least 51-49 so theres a clear final decision maker.

GGamze E***MemberCommunity member
Joined
May 2022
Message
248
#10

If you want to protect your friendship, talk through the money and equity down to the harsh details today. Clarity in writing doesn't ruin a friendship; on the contrary it's ambiguity that kills it.

İİlker K***Member
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Technical service technician
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IT services
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medium-sized business
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Nov 2025
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273
#11

I've been dealing with this for a long time. Everything goes well for the first three months; problems arise in the fourth.

Proven by experience.

KKoray Ç***Member
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Network Administrator
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Tourism
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sole proprietorship
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Apr 2025
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Doki · Penetration test · 2026

#12

I feel the same way. The real issue isn't the number, but what it's based on.

Proven by experience.

NNazlı A***MemberCommunity member
Joined
Oct 2025
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58
#13

let's separate the concepts they're getting mixed up... if you don't write this down from the start it leads to arguments later.

provn by experience.

BBekirNew member
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Site Manager
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a company within a holding
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28
#14

Great work.

MMehmet G***Member
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Accounting clerk
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boutique agency
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#15

I went through the same thing.

İİbrahim S***MemberCommunity member
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Apr 2026
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106
#16

here's how it went for us... the biggest time-waster for us was not knowing who had the final say.

SSena Y***Member
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Front office accounting
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Healthcare services
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chain store
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May 2023
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205
#17

I'm in the same situation, that's why I'm asking. Don't hesitate to ask; those who don't ask always pay more.

I'm also curious if anyone does it differently.

OOkan K***Member
Job title
Store associate
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Healthcare services
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8-person team
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Aug 2023
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5
#18

We need to take it step by step. The answer varies greatly by industry; there is no one-size-fits-all rule.

Correct me if I'm wrong.

HHakan C***Member
Job title
Country Manager
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Furniture manufacturing
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workshop
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Jan 2025
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417
#19

Yes, that's exactly how it is with creating an appointment booking system. If you don't write this down from the start it leads to arguments later.

I'm also curious if anyone does it differently.

FFeyza S***Expert
Job title
Export manager
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Cosmetics
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family business
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Feb 2024
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99
#20

Let me summarize the topic, since several different answers were given. Give trial work but pay for it; free trials don't bind anyone.

This is my opinion, I'm not claiming it's absolute truth.

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