Validate
2 weeks$4,900 fixed
Find out if it's worth building before you spend on development.
- Clickable prototype
- Tested with 5 real users
- Tech recommendation and MVP estimate
Fractional CTO & product studio · US company, nearshore team
Your tech team, without the hiring.
Mogambo is a full-stack studio for startups and small businesses. We act as your technical partner: we help you choose the right technology, build your product, and ship it at a fixed price.
Fixed priceYour time zoneWeek-1 guaranteeYou own the code
Engineering experience fromXapo BankBitstack (YC S22)HosekiControl· 10+ years · web, mobile, backend, AI
Mogambo at a glance: US-registered product studio offering fractional CTO services and fixed-price MVP development for startups and small businesses. Led by Alejandro Arjonilla, a full-stack engineer with 10+ years of experience at Xapo Bank, Bitstack (YC S22), Hoseki and Control. Builds web apps, mobile apps (iOS, Android, Flutter), backends and AI features. Works in English and Spanish on US time zones. Prices from $2,500 (Tech Audit) to $24,000+ (6-week MVP).
Who we work with
People with a business, not an IT department.
Non-technical founders
“I need an MVP to show investors.”We trim the scope to what you need to validate, and get it in front of real users fast.
Small businesses
“We run this on spreadsheets and email.”We turn that process into a simple web or mobile tool for your team or your customers.
Teams with legacy code
“Nobody wants to touch the codebase.”We audit it, stabilize it, and set it up so it can grow again.
Packages
Fixed scope. Fixed price. No surprise invoices.
Pick the one that matches your stage. Not sure? Start with Validate. We credit it toward Launch.
Launch
6 weeksfrom $24,000
Your MVP in production, ready for paying users.
- Web app or mobile app (second platform as an add-on)
- Backend, auth and payments
- One AI feature included
- Analytics and 30 days of support
- Week-1 guarantee: not convinced, you don't pay
Fractional CTO
Monthly$6,500 / month
Senior technical leadership, two days a week, without a full-time hire.
- Roadmap, architecture and hiring
- Hands-on code when it matters
- Cancel anytime
Tech Audit · $2,500 · 1 weekAlready have code or a quote from another vendor? Get a clear, written second opinion.
Request an auditFounding client program
We're opening 3 founding-client spots: 25% off a Launch sprint, in exchange for a public case study and a testimonial once your product is live.
Prices in USD. Taxes not included where applicable.
The Launch sprint
Six weeks, week by week.
Every Friday you see the product working. Never more than 7 days without something you can click.
- Week 1
Discovery
Workshop, users, locked scope, signed plan.
Scope doc - Week 2
Design
Key screens and main flow, approved by you.
Figma designs - Week 3
Foundation
Stack chosen with you. Architecture, auth, backend, CI.
First deploy - Week 4
Core
The feature that makes your product unique, end to end.
Working demo - Week 5
AI & payments
Integrations, AI feature and billing.
Private beta - Week 6
Launch
QA, production deploy, app store release if needed.
Live
Technology
Your stack, your call. We'll guide you.
We recommend a stack based on your budget, your team and where you want to be in three years. Already have one? We'll work with it.
Web
ReactNext.jsVueAstro
Mobile
SwiftKotlinFlutterReact Native
Backend
Node.jsPythonGoJava
Data
PostgreSQLSupabaseFirebaseMongoDB
AI
OpenAIClaudeGeminiOpen models
Cloud
AWSGoogle CloudVercelAzure
Working with us
You always know what's happening.
Friday demos
You see the product working, not a timesheet.
Shared Slack channel
Same-day answers during your business hours.
You own everything
Code, domains, accounts and servers are in your name from day one.
Plain-English decisions
Every technical choice comes with the why and the cost.
Who's behind Mogambo
Fintech-grade engineering, for your product.
Mogambo is led by Alejandro Arjonilla. He has spent 10+ years taking products from zero to production, mostly in fintech, where mistakes cost real money. He has built apps from scratch, led a full rewrite without breaking the live product, and co-founded a startup. Your product gets the same standard of security, testing and reliability.
10+years shipping products
4fintech & bitcoin companies
5+apps built from scratch
Control
Product Engineer · 2024–now · digital-asset custodyBuilt the iOS app from 0 to 1 and scaled it into a production product. Expanded into backend and frontend, and turned business needs into technical specs.
Bitstack
Mobile Lead · 2023–2025 · YC S22 bitcoin savings appOwned the mobile roadmap. Decided and led the rewrite from a legacy codebase to a new Flutter app while keeping the live app stable. Apple Pay, Google Pay, real-time data.
Hoseki
iOS Engineer · 2021–2023 · bitcoin verification & custodyBuilt the iOS app from scratch and worked across the stack: Swift on mobile, Node.js on the backend.
Xapo Bank
iOS Developer · 2018–2021 · global digital bankHelped relaunch the app from scratch with a fully remote team across time zones, shipping on time.
Earlier
Co-founder at PROSFY · Mobile lead in digital consulting · Video startupLed external consultants on client projects and built three video apps from scratch.
“A super complete engineer.”
Company names refer to Alejandro's previous roles as an employee. They are not Mogambo clients.
What you'll get
See the work before you sign.
On the first call we walk you through anonymized examples of each of these.
Scope document
What's in, what's out, dates and price. Signed in week 1.
Stack recommendation
Two or three options with their 3-year cost, in plain English.
Friday demo
A 2-minute video of the product working, every week.
Audit report
Risks, priorities and costs for an existing codebase.
From the lab
Where we test hard tech before using it for clients.
Real-time analysis of a throw from the phone camera, fully offline.
View on the App Store →Transcribes a doctor's visit on the device and drafts the clinical note. No audio leaves the phone.
Learn more →¿Hablas español?
We work in English and Spanish from Latin America, on US hours. A good fit for Hispanic-owned businesses in the US and for Latin American and Spanish startups entering the US market.
Ver en españolFAQ
What founders ask on the first call.
I'm not technical. Is that a problem?
No. That's exactly who this is for. We translate every decision into time, money and impact on your users.
How much does an MVP cost?
A typical MVP lands between $20,000 and $40,000, depending on scope and platforms. On the call we'll give you a range for your case, then a fixed price once the scope is clear.
What technology do you use?
Whatever fits your business best. We build web apps, mobile apps, backends and AI features with React, Next.js, Swift, Kotlin, Flutter, Node.js, Python, PostgreSQL and more. We walk you through the options and their 3-year cost, and you decide.
Where are you based? What about time zones?
Mogambo is a US company, so contracts, invoicing and IP assignment follow US law. Engineering happens nearshore, from Colombia, on UTC-5: the same time as New York in winter and one hour behind in summer. Your workday is our workday, and you get senior engineering without big-agency overhead.
What is the week-1 guarantee?
If at the end of the first week of a Launch sprint you are not convinced, you walk away and don't pay for that week. You keep everything we produced.
What if I want to hire my own team later?
Great. We help you hire, run the handover and document everything. The code is written so others can pick it up.
Will you sign an NDA?
Yes, before the first detailed conversation if you need it. All code and IP are assigned to you.
First call
30 minutes. No strings attached.
Tell us about your idea or your problem. We'll tell you honestly whether it makes sense to build it and how we'd approach it. We reply within one business day with times for a call.
Prefer email? Write to hello@mogambo.xyz