András Ferencz

For Businesses & Startups

Building High-Performance Mobile Apps for Businesses & Startups

Over ten years of native mobile development, specializing in scalable applications with 3M+ downloads. I help you build faster, cleaner, and with fewer costly mistakes.

10+

Years building mobile

3M+

Cumulative downloads

5+

Native apps shipped

3

Industries served

Why work with me

Senior engineering, founder mindset

I don't just write code. I diagnose bottlenecks, connect technical decisions to business outcomes, and ship products that scale.

Performance optimization

Faster startup, smoother scrolling, lower crash rates, and leaner builds.

Bottleneck diagnosis

I find what's actually slowing your product and team down, then fix it.

Scalable architecture

Clean, modular, testable foundations that grow with your product.

UI/UX collaboration

I work closely with design to ship experiences that delight users.

Tech stack

AI-first, mobile to the core

I build with AI agents every day: a harness that runs my business, an agent team that makes content, agents that review and fix pull requests. Underneath, the mobile craft they serve.

AI harness engineering

  • Claude Code
  • Agent harnesses
  • MCP servers & typed tools
  • Context engineering
  • Evals & self-tests
  • Guardrails & sandboxing

AI SDLC

  • Spec-driven development
  • Agent-written PRs
  • AI code review
  • AI-assisted testing
  • Plans in the repo
  • Human-approved merges

AI in your product

  • LLM features in apps
  • RAG & grounding
  • Citations you can open
  • Cost & usage metering
  • Privacy by design

Mobile

  • Kotlin
  • Jetpack Compose
  • Coroutines
  • Swift
  • SwiftUI
  • React Native · Expo

Architecture

  • Clean Architecture
  • MVVM
  • Modularization
  • Offline-first
  • Performance

Platform & tooling

  • Supabase
  • Firebase
  • GraphQL
  • REST
  • Electron
  • Next.js
  • GitHub / GitLab CI
Service 01

Building Native Mobile Apps

I build scalable, maintainable Android and iOS apps from scratch, or join your team to accelerate an existing product. Available on a freelance, contract, or consulting basis.

From architecture and setup through launch and iteration, I bring senior-level engineering that turns your vision into a clean, production-grade app.

Native mobile app development
Service 02

Scaling Business with Mobile Strategy

The right mobile strategy is the difference between an app that stalls and one that compounds. I help you plan, optimize, and future-proof your mobile products for growth.

Architecture reviews, CI/CD setup, cross-platform analysis, and a lean technical roadmap that serves your business goals, not just engineering elegance.

Mobile strategy
Service 03

Consult on Mobile Development

Refine your architecture, optimize performance, and scale your mobile products with expert, hands-on consulting.

Whether you need a technical audit, a second opinion on a pivotal decision, or ongoing guidance, I bring battle-tested insight from real, shipped products.

Mobile development consulting

Native Android & iOS

Startup to scale-up

Strategy & consulting

From idea to

Scalable Mobile Apps

Grab my free eBook and learn the exact steps I follow to take a mobile app from a raw idea to a scalable, maintainable product.

From Idea to Scalable Mobile Apps — free eBook

The newsletter

Engineering OS

Every week (ish): actionable engineering tips, Android and iOS news, and what I learn building with AI. Straight to your inbox.

  • Engineering tips
  • Android & iOS
  • Building with AI

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Have a mobile project in mind?

Let's build something clean, scalable, and maintainable together.