// Android · AI · Scale

Your app.
Smarter.
Faster.

A boutique engineering studio specialising in AI integration for Android apps. Built by an engineer who has shipped at Microsoft, Meta, and Adobe — with 12+ years building products used by hundreds of millions.

Start a Project See Services
// Our engineer has shipped at
Senior Engineer · L64
Large-scale Android · Mobile Platform
Senior Engineer · E5
Android Features · Design Systems
Computer Scientist · 5 Years
Android Apps · AI & NLP features
Senior Engineer
OS Frameworks · System Engineering
// Identity private by design · Results speak for themselves
12+
Years shipping Android
4
Top-tier tech companies
100M+
Users on apps we built
7d
Avg. first delivery
// What we build

Pick a feature.
We ship it.

No bloated contracts. No endless meetings. One clear deliverable at a time.

01 ——
AI Chatbot Integration
Add a smart in-app assistant powered by Claude or GPT. Handles support, answers user questions, reduces churn. Clean, tested Android code.
From $400
02 ——
Smart Search & Recommendations
Replace keyword search with semantic AI. Surface recommendations that feel intuitive. Users stay longer and engage more deeply.
From $500
03 ——
Workflow Automation
Automate repetitive in-app tasks — summarise, classify, generate content. Built on architecture proven at enterprise scale.
From $350
04 ——
CI/CD & App Health
Crash monitoring, startup time, app size, caching, faster page loads. Set up from scratch at both high-growth startups and Fortune 500 companies.
From $600
05 ——
AI Maintenance Retainer
Keep your AI features sharp. Monthly updates, prompt tuning, on-call fixes, architecture reviews. Senior eyes on your app, permanently.
From $600/mo
06 ——
Custom AI Feature
Have a specific idea? We scope it free, estimate effort, and deliver production-ready Android code with full documentation. No guessing.
Custom quote
// Why Start21

Not an agency.
An engineer.

The same calibre of engineer that Microsoft and Meta pay premium salaries for — without the overhead, the account managers, or the six-week timelines.

01
FAANG-level expertise

Led Android teams at top-tier companies, shipped design systems used by billions, and built AI features into consumer apps at scale. That context is irreplaceable.

02
You own everything

Full source code, full IP, zero lock-in. Cancel anytime. We don't hold your code hostage.

03
Async & remote by default

No timezone headaches. Clear written communication, clean code, no wasted calls.

04
Identity-private studio

We operate with discretion. Our track record at the world's top tech companies is real and fully verifiable on request.

// How it works

Four steps.
Zero friction.

01
Tell us your app
Fill in the short form. Takes 2 minutes. No calls needed to get started.
02
Free scoping
We respond within 24hrs with a clear scope, timeline, and fixed price. No surprises.
03
We build it
Clean, documented, production-ready Android code. Delivered in 5–10 days.
04
You own it
Full code ownership. Keep us on retainer or walk away — completely your call.

Start your
project today.

Tell us about your Android app and what AI feature you want. We respond within 24 hours with a clear, no-obligation scope.

Free scoping, no commitment
Fixed price, no billing surprises
First delivery within 7 days
Full code ownership guaranteed
FAANG-level senior engineer