Your CTO + Developer Partner

I'm your CTO
and developer.

No equity, no VC bullshit. You focus on marketing and sales, I handle all tech. Let's build something profitable.

Schedule Your Call View Pricing

30M+

Downloads

13+

Years

Unity

Exit

Apple

Featured

Building an app shouldn't mean...

Giving away 20% equity to a "technical co-founder"

Paying $50-100K to an agency that disappears

Hiring cheap devs and getting broken code

Learning to code yourself (you have a business to run)

Playing VC games just to afford development

Getting stuck with code you can't maintain

Let's do this differently.

CTO + Developer in one

You get strategy AND execution
No middlemen, no PMs
Direct access to 13 years of experience

Revenue share = Aligned incentives

I take 20% of revenue while we work together
I only win when your app makes money
No equity, no long-term lock-in

iOS + Android together

Native iOS quality
Android port included
Both App Stores, one price

Simple. No surprises.

We talk

60 min call, free welcome call

• You share your idea
• I tell you if I can help
• No pitch, just honest conversation

We plan

Sprint scoping

• Define what we build in 2 weeks
• Clear deliverables
• You pay 50% upfront

I build

Sprint execution

• iOS native app
• Android port
• You get updates, not meetings

We launch

App Store

• Both stores submitted
• You start making money
• Revenue share kicks in

We grow

Support phase

• $2K/month keeps app healthy
• Bug fixes, updates, guidance
• I stay invested (20% revshare)

New feature?

New sprint

• Need more features? Start a new sprint
• Same process, same pricing
• We keep building together

Investment, not expense.

Development Sprint

$3,000

per 2-week sprint

+ 20% revenue share

iOS + Android
CTO guidance included
MVP features (scoped per sprint)
App Store submission
Code review & quality
Sprint planning

Let's Start Building

Ongoing Support

$2,000

per month

+ 20% revenue share

Bug fixes & updates
Monthly strategy call
Performance monitoring
App Store updates
CTO advisory (async)
Release management

Keep My App Growing

Revenue share only applies while we work together. You stop paying, revshare stops. Clean and simple.

Option	Cost	What you get
Hire full-time CTO	$150-300K/year	One person, salary + equity
MVP Agency	$50-100K	Build and disappear
Cheap freelancer	$5-10K	Broken code, your problem
lets.mobi	$3K/sprint	CTO + dev + aligned incentives

30 million downloads. Here's how.

COSMIC TAPS

Senior iOS Engineer

Managing 1M+ downloads/year portfolio at 99%+ bug-free rate

10M+ downloads

Managed app portfolio

iOS, Swift, Portfolio Management

Struckd

Unity Technologies

Leading 3D Game Creator tool and social platform for game makers

12M+ downloads

Acquired by Unity Technologies

iOS + Android + Unity Plugin

INHAABIT

AR Pioneer

Four apps for 3D Configurators and AR Render Tools

Enterprise clients

Pioneered AR before Apple's official ARKit release

iOS, ARKit, 3D, Modular Architecture

Good Thinking Games

Contract Work

Hamiltonian Circuit puzzle game

Published game

Solved critical performance issues

iOS + Android (Swift, SwiftUI, Kotlin)

Revere

Contract Work

App for notes about people with integrated services

Enterprise app

Performance and optimization expert

iOS, Apple Frameworks

Daily Dozen

Health & Fitness

Health tracking app

1M+ users

Apple Featured

iOS + Android (HealthKit)

What founders say

"Konstantin has been amazing to work with: not only is he a super solid iOS dev, but he also brings tons of experience with all the technologies we use. He also has a business mindset, which is rare: he always thinks about the business value of what he's building and doesn't hesitate to suggest smarter ways to do things. Also simply a great human and team player."

Kevin

Owner, COSMIC TAPS

10M+ Apps Portfolio

"I have many years of software development and management experience at highly selective companies like Microsoft and Google, and I found Konstantin's work to be on par with that of those developers. He also fixed some performance problems that I had been unable to resolve even after prolonged effort."

David Erb

CEO, Good Thinking Games

ex-Microsoft/Google

"It was a pleasure to work with Konstantin. The communication was very good. With his excellent skills and knowledge of various technologies he was able to complete the project with ease."

Oliver Walzer

Co-Founder & CTO

Unity Technologies

"Konstantin is one of those freelancers that you come across only once in a while and hope to work with for a long time. He's everything you'd expect from a professional in terms of communication and quality of work and he adds to that a passion for his craft that keeps him on the cutting edge."

Mark Rabo

CEO, Revere Inc

Enterprise Client

"Konstantin is an excellent developer with not only great code skills, but excellent communication. He helped us see (and avoid) a number of problems before they came up. One of the best developers I've worked with!"

Jordan Yim

Co-founder & CTO, INHAABIT

AR Pioneer

Hey, I'm Costa

13 years building apps. 30 million downloads. Exit to Unity. I've worked with everyone from solo founders to Fortune 500.

Now I help non-technical founders build profitable mobile apps - without giving up equity or playing VC games.

I live in Vigo, Spain with my family. When I'm not coding, I'm sailing my boat or chasing my kids around.

Let's build something real.

30M+

Downloads

13+

Years Experience

100%

Client Satisfaction

30+

Projects Shipped

Journey

2012

Started freelancing, Top Rated on Upwork

2017

Pioneered AR at INHAABIT

2020

Struckd acquired by Unity (12M downloads)

2023

Senior iOS Engineer at COSMIC TAPS (10M+ downloads)

2025

lets.mobi - helping founders build profitable apps

Questions?

Why revenue share instead of equity?

Equity is forever. Revenue share is only while we work together. You stop paying, I stop earning. Clean and fair. Plus, I don't want to be in your cap table - I want to help you build and move on.

What if my app doesn't make money?

Then I don't earn revenue share. That's the point - my incentives are aligned with yours. I want your app to succeed.

Do you do web apps?

I focus on mobile (iOS + Android). If you need a web app, I can recommend people, but it's not my specialty.

What tech stack do you use?

iOS: Swift (native). Android: Kotlin port from iOS codebase. Backend: Depends on your needs - usually Firebase, Supabase, or custom Node.js.

How does the 20% revenue share work?

I get read-only access to your App Store Connect. Each month, I invoice 20% of net revenue. If you stop the support contract, revenue share stops too. No hidden terms.

Can I see the code?

Yes, you own 100% of the code. Full source, documentation, everything. It's your app.

What if I need more than one sprint?

Most MVPs take 3-6 sprints. We plan together and you can stop anytime. No long-term contracts.

Do you work with VC-backed startups?

I prefer bootstrapped founders, but I'll work with anyone who wants to build a real business (not just raise the next round).

Let's build your app.

60 min call, free welcome call. No pitch. Just honest conversation about your idea.

Schedule a Call or Email: costa@lets.mobi

30M+ downloads • 100% positive reviews • 13+ years experience

I'm your CTO and developer.