Available for new builds · New York

I build apps that actually ship.

iOS apps, App Store launches and AI software, built by one senior engineer who has taken 17 apps from idea to App Store submission. Fixed prices. You own every line.

Tell me what you want built → See pricing
17iOS apps built and submitted
7live on the App Store now
120+public repositories
480GitHub stars on my open source
Proof, not promises

Apps I designed, built and shipped myself.

Every one of these is native SwiftUI with its own design, built end to end: product, code, icon, screenshots, store listing and review. Tap one to see it on the App Store or its source.

Chain app iconChainLIVE Ironbook app iconIronbookLIVE Quiver app iconQuiverLIVE Baseline Ledger app iconBaselineLIVE Fairway Ledger app iconFairwayLIVE Pocket Beings app iconPocket BeingsLIVE Clear the Strait app iconClear the StraitLIVE Rooms app iconRoomsIN REVIEW Odometer app iconOdometerIN REVIEW Clockout app iconClockoutIN REVIEW Curve app iconCurveIN REVIEW Pricebook app iconPricebookIN REVIEW Pawprint app iconPawprintIN REVIEW Chores app iconChoresIN REVIEW Minder app iconMinderIN REVIEW Race Fuel app iconRace FuelBUILT

A release pipeline most teams would envy

My apps are built, signed, screenshotted and submitted to Apple entirely by automation: GitHub Actions macOS runners, XcodeGen, fastlane and a set of scripts that drive the App Store Connect API. Pricing, listings, in-app purchases and review notes are all code. Your project gets the same pipeline, so every release after launch is one command, not a lost afternoon.

Beyond iOS

  • AI and LLM engineering in Rust, C++ and Python: orchestration, streaming, cost control, evaluation
  • A family of 26 single-header C++ LLM libraries
  • Offline web apps and tools, 120+ shipped on Gumroad
  • Quant and market-data code in Rust and C++
Services and pricing

Senior work, priced like it.

I work with a small number of clients at a time and price for outcomes, not hours. Every engagement is fixed scope and fixed price, agreed in writing before any work starts.

Prototype sprint
$9,500
2 weeks · fixed price

Your idea, running on your phone. The fastest way to find out if it is worth building.

  • Working iOS app on TestFlight
  • Your core flow, fully designed
  • Clickable on your own device in 14 days
  • Source code and repo handed over
  • Credited in full toward a Launch
Book a sprint
App Store launch
$28,000 from
6 to 8 weeks · fixed price

A complete, polished native app, live on the App Store under your name.

  • Custom design, not a template
  • SwiftUI app, your data model, your brand
  • In-app purchases or subscriptions if you want them
  • Icon, screenshots, listing and App Review handled
  • Automated release pipeline you keep
  • 30 days of fixes after launch
Plan a launch
AI build
$18,000 from
3 to 6 weeks · fixed price

AI features that work in production: grounded, measured and affordable to run.

  • LLM features in your app or backend
  • Agents, retrieval and tool use
  • Cost limits, retries and evaluation built in
  • Rust, C++, Python or Swift
  • Documented, tested, handed over
Discuss an AI build
$225 / hour for advisory, code review and small changes. Monthly retainers from $9,000.

50% deposit to start, 50% on delivery. Projects start within two weeks of signing.

How it works

No surprises, from first email to launch.

Brief

You tell me what you want built. I reply within one business day with questions.

Fixed quote

A written scope, price and date. If the scope changes, we agree the change first.

Weekly builds

A new build on your phone every week. You see real progress, not status reports.

Launch

I ship it, handle App Review, and hand you the code, accounts and pipeline.

Open source

Read my code before you hire me.

Rust

tokio-prompt-orchestrator

Multi-core, Tokio-native orchestration for LLM pipelines.

 C++

llm-cpp

26 single-header C++ libraries for building with LLMs.

 Rust

rust-crates

My Rust libraries for AI agents and market data.

 Rust

Every-Other-Token

Real-time LLM stream interception at the token level.

 Rust

proof-engine

A mathematical rendering engine for real-time visuals.

 GitHub

Everything else

120+ public repositories across Swift, Rust, C++ and Python.
Questions

Why hire me instead of someone cheaper?

Why do you cost more than the average freelancer?

Because you are paying for a shipped product, not hours. Most freelance app projects stall between "it runs" and "it is on the App Store". I do the whole path, design through App Review, and I have done it seventeen times. A cheaper build that never launches is the most expensive option there is.

Who owns the code?

You do. The repository, the design files, the App Store listing and the release pipeline are yours at handover.

Do you work with agencies or other developers?

Yes. I can build a feature, rescue a stuck release, set up automated App Store delivery for your team, or review an existing codebase at the hourly rate.

What do you not do?

Games with heavy 3D art, Android-only apps, and anything I cannot ship to a standard I would put my name on. If it is not a fit, I will say so on the first email and point you somewhere better.

How fast can you start?

Usually within two weeks of a signed scope. Prototype sprints can often start sooner.

Start a project

Tell me what you want built.

A few lines is enough: what the app does, who it is for, and when you need it. I reply within one business day with questions and a rough price range.

Email me a brief →
Email mattbusel@gmail.com LinkedIn in/matthewbusel GitHub @Mattbusel App Store 7 live apps Gumroad 120+ tools