App developer for hire

I build apps people actually use.

An experienced developer who takes ideas from creators, founders and businesses from zero to shipped — and fixes, maintains and grows the apps you already have. iOS, Android & full-stack web. I own the engineering end to end and partner with world-class designers, so your product looks as sharp as it runs.

10+
Years building & shipping software
4
Apps launched in the app stores
1M+
Total downloads
1
Developer — idea to launch, end to end

Who I build for

New idea, big audience, or an app that needs help.

01 / Creators & influencers

Your audience trusts you. Give them an app they'll pay for.

YouTubers, fitness creators and influencers: I turn your programs, method and community into a subscription app on iOS and Android. Workout programs, challenges, tracking, community, paywalls — built to feel like you, not a template.

  • Fitness, wellness & habit apps
  • Subscriptions, trials & launch to your audience
  • Moving off a white-label platform
02 / Founders & businesses

Have an app idea? Let's ship it.

Non-technical founders, startups and businesses: I take a rough idea to a real MVP in the App Store and Google Play — scoped tight, built to grow.

03 / Apps already live

Fix it, maintain it, grow it.

Developer gone? App crashing, outdated or stuck? I take over existing apps, stabilise them, keep them current, and improve paywalls, churn and App Store rankings.

Selected work

Real apps. Real users. Shipped and grown.

  1. Escape the Vape home screen showing 43 days vape-free, savings, and community motivation
    01

    Escape the Vape

    ~10K downloads / month · iOS & Android

    Co-founder & sole developer

    The first quit-vaping app on both iOS and Android. A subscription business grown with data — pricing experiments, ASO and analytics — with a no-shame ethos at its core.

    Get it iOS Android

    • React Native
    • Redux
    • Firebase
    • In-App Purchases
  2. Dry Quest map screen with a winding trail of dry-day milestones and daily quests
    02

    Dry Quest

    1 year · Rapidly growing & engaged community

    Founder & Sole developer

    A freemium iOS app for mindful drinking, built on harm-reduction — progress over perfection. An RPG-styled world with daily quests, collectible rewards and an in-app economy engineered to bring people back.

    Get it iOS Android

    • Expo
    • React Native
    • Firebase
    • Rive
    • RevenueCat
  3. Lexody Discover screen for browsing language partners nearby
    03

    Lexody

    Since 2014 · Web, Android & iOS

    Founder & Sole Developer

    One of the first language exchange platforms on the web. I've built and run Lexody for over a decade — web and mobile, front to back. Find a language parter, practice your speaking, and level up your language skills. (Currently on a development hiatus, but still available to the world.)

    Get it iOS Android Web

    • Ruby on Rails
    • React
    • React Native
    • Node.js
    • PostgreSQL
    • Stripe
    • Google Maps API
    • Heroku
    • Twilio
    • SendGrid
    • PostHog
    • AWS S3
  4. Drip home screen with a caffeine droplet tracker and AI photo-or-voice logging
    04

    Drip

    Built in 3 days · Live on the App Store · iOS

    Founder & Sole developer

    A caffeine tracker with AI photo-and-text logging and a real-time caffeine decay chart that tells you when you'll be ready for sleep. Built fast, tuned hard for the App Store.

    Get it iOS

    • Expo
    • React Native
    • Firebase
    • AI logging

These are just my apps... but I've built and shipped many more over the years for other people and teams, with and without other developers. I love working alongside a talented team, but I'm also happy to work solo. Previous long-term contract builds include years as a Senior Software Developer — and several apps I can't show here under NDA. Happy to walk you through those on a call.

What I do

You bring the idea. I ship the product.

01 / Idea → MVP

Build my app idea

Have an idea and no dev team? I take it from a rough spec to a real, shipped MVP in the App Store — fast, and built to grow instead of thrown away.

02 / Mobile

iOS & Android apps

Cross-platform React Native apps that feel native on both. Payments, auth, push, offline, analytics — the entire stack, done properly.

03 / Web

Full-stack web apps

Rails and React web apps with real backends: databases, integrations, Stripe payments and payouts, the works. A decade of production experience behind them.

04 / Launch

Launch & growth

I don't just build — I help it get downloaded. App Store optimization, analytics, and pricing experiments that turn a launch into a business.

05 / Rescue

Fix my app

Inherited code, a developer who disappeared, crashes, broken purchases. I audit, stabilise and get your app shipping again — usually without a rewrite.

06 / Care

Maintenance & updates

OS updates, store SDK deadlines, dependency upgrades, bug fixes and small improvements on a predictable monthly plan, so your app never falls behind.

I bring the engineering. For design, I partner with people who are genuinely great at it — so you get both, without hiring a whole team.

The toolkit

A decade of production tools.

  • React Native
  • Expo
  • Swift / iOS
  • Android
  • TypeScript
  • React
  • Redux
  • Ruby on Rails
  • Node.js
  • PostgreSQL
  • Firebase
  • AWS S3
  • Heroku
  • Stripe
  • RevenueCat
  • Twilio
  • SendGrid
  • OpenAI
  • PostHog
  • Google Maps API
  • Rive

About

I'm Walsh — a developer who ships.

For a decade I've built and launched real apps used by real people. Mobile, web, backends, payments, analytics, App Store launches: the whole thing, not just the fun part.

I've run my own apps with paying subscribers and spent three years as a senior developer inside a fast-moving startup. I know how to make the call between shipping now and building it right — and when they're the same thing.

I don't design. But I've worked with exceptional designers for years, and I bring them in — so you get world-class engineering and design from one point of contact.

Start a project

FAQ

Questions creators ask me.

Can you build an app for my fitness brand or YouTube channel?

Yes. I build subscription apps for creators and influencers, from workout programs and challenges to community and coaching features. Your audience is the distribution; I handle the engineering, App Store launch and in-app purchases, and bring in a designer I trust. See how to build a fitness app as an influencer.

How much does it cost to build a workout app?

A focused custom MVP for iOS and Android usually lands in the low-to-mid five figures, depending on video, programs, community and integrations. White-label platforms are cheaper up front but take a monthly fee and often a revenue cut. Full breakdown: what a fitness app really costs.

I already have an app. Can you help it grow?

Yes, and often that's the higher-return work. I audit and improve paywalls, pricing, onboarding, churn and App Store optimization, using the same playbook I use on my own subscription apps. Start with the growth audit checklist.

How long does it take to build an app?

A well-scoped MVP typically takes 6 to 12 weeks from kickoff to App Store submission. I built Drip, a small single-purpose app, in three days. Content-heavy apps with video and community take longer. More in realistic app timelines.

Do you work with clients outside the US?

Yes. I work remotely with creators and founders worldwide.

More answers on the blog: building, pricing, launching and scaling apps for creators.

Let's talk

Let's build your app.

Tell me what you're trying to make — a rough idea is plenty. I read and reply to everything myself.

Project inquiry Takes 2 minutes

Got it — I'll write back myself.

Thanks for the details. I read every inquiry and usually reply within a day or two.