Sousy Studio Fixed price · Two weeks · Shipped

Complete products, shipped in two weeks.

Product UX, frontend, backend, AI, payments, and app-store deployment, built by one senior developer for a fixed price agreed before we start. What you get at the end is the working product, running on your domain or submitted to the stores.

Four products conceived, built, and shipped solo, covering interface, server, AI, billing, and store listings. Each one went through the same steps a client project does.

9
Live store listings
4
Products shipped solo
iOS · Android
macOS · Web
Platforms delivered
1
Person you deal with
What you can buy

Two weeks. Fixed price. Shipped.

Three ways to work together, all priced before I start. Each is scoped to one clear outcome, which is what makes a fixed price workable for both of us. If I estimate badly, absorbing that is my problem rather than yours.

Product build

Product Sprint

One production product, built around a single primary user journey.

From $7,500

Typically $8–15k · Per scope


  • One primary journey, written down and agreed before the start
  • Web, mobile, or both, depending on what the product needs
  • Built from your designs, or on established design systems if you have none
  • Accounts, payments, and store submission quoted as part of that scope
  • Most ship in one two-week sprint; larger scopes are quoted as two
  • One revision round included

For founders and owners who need the first real version to exist.

Ongoing

Build Partner

A standing block of capacity on your product.

$2,000–4,000

Per month · Rolling


  • Two to four days of build capacity every month, prioritised by you
  • Agreed response times when something urgent breaks
  • Unused capacity expires at the end of each month
  • The person who built it is the person improving it
  • Stop with 30 days' notice, no lock-in

Starts after any sprint, once you know what the next version should be.

The two weeks, hour by hour

You see it running on day three.

Fixed-price work goes wrong when the client can't see anything until the end. So there's a deployed link in your hands early, and it updates as the build goes. Ten working days, two demo videos, one revision round. This is the plan you're buying.

Scope & kickoff
One call, then a feature list we both sign.
Day 1
Interface & core build
The screens and the data model, the parts you'll actually touch.
Days 2–6
AI, payments, integrations
The features carrying the risk, built early on purpose.
Days 4–8
Polish & your revisions
Your notes from the week-one demo, applied.
Days 7–9
Deploy & handoff
Live on your domain or submitted to the stores.
Day 10

A deployed preview link lands on day three and stays current for the rest of the sprint. Demo videos arrive at the end of each week, so reviewing the work never depends on finding a meeting slot.

Selected work

Everything here was built by one person.

Four products, each taken from empty repository to store listing: product UX, backend, AI, subscriptions, review submissions, and the marketing page you land on. Different stacks in each case, because the products needed different things.

Sousy
iOS · Android · Web

An AI cooking assistant that turns a TikTok, YouTube, or Instagram link into a structured recipe you can actually cook from.

  • Video and blog links parsed into clean, structured data
  • Two AI providers with automatic failover, so a provider outage doesn't take it down
  • Stripe, Apple, and Google billing behind one subscription model
  • Nine languages, home-screen widgets, and an embeddable recipe widget
Live · App Store & Google Play sousy.com →
Cookback
iOS · Android · Apple Watch

A cooking journal that remembers for you, and can answer questions about your own cooking history.

  • Retrieval over your personal history, scored by an eval suite before any prompt ships
  • Works offline first, mirrored privately through iCloud
  • No accounts at all, with abuse protection through Apple App Attest instead
  • Live Activity, Dynamic Island, and a Watch app for an active cook
Live · App Store & Google Play cookback.app →
Bento Playbox
iOS · Android · Paid app

A Montessori-style activity app for ages two and up, with nine toys and nothing to buy once it's installed.

  • Two hand-written native builds: SwiftUI with SpriteKit, and Jetpack Compose
  • 559 licensed voice clips, loudness-matched through a scripted pipeline
  • A 176-food catalogue generated and bundled, so it works offline
  • No backend, no accounts, no ads, no tracking, and one $2.99 purchase
Live · App Store & Google Play sousy.com/games →
off my chest.
iPhone · iPad · Mac · Android

A writing app where the words burn away as you type. Nothing is saved, sent, or recoverable.

  • Custom text rendering: words ignite, wash, crumble, or drift off as fireflies
  • Seven moods, each with its own paper, ink, and pace
  • Zero backend, zero analytics, two dependencies in the whole app
  • One codebase across four platforms, including a real Mac build
Live · App Store & Google Play getitoffmychest.app →
How the work runs

Why the fixed price holds.

A fixed quote only works for both of us if the boundaries are clear before we start. These are in every agreement, and they're the reason the date on the quote is the date you get it.

Scope

A signed feature list, before day one

One page, in plain language, that we both approve. The price is attached to that list, and so is the definition of done.

Design

Product UX and interface, not brand identity

Sprints cover the UX decisions, screen layouts, and a polished implementation. If you have designs or a brand, I build from them; if you don't, I build a clean interface on established design systems and platform conventions. Logos, illustration, and bespoke visual identity aren't included.

Payment

Half up front, half on delivery

Invoiced through Stripe. No hourly billing and no surprise overage.

Revisions

One round included

Collected after the week-one demo, while changes are still cheap. Further rounds are quoted like any other work.

Contact

Two calls, two demo videos

A kickoff call and a handoff call. In between, a recorded demo each week and a live preview link, so progress is visible without standing meetings.

Changes

New ideas get a number and a date

New ideas are welcome. Anything outside the signed list comes back as a price and a number of days, and you decide.

Ownership

The code is yours at handoff

Full ownership, in your repository and your accounts. White-label terms available if you're an agency delivering it as your own.

For agencies and design studios

Overflow capacity that never talks to your client.

If you've sold work you can't staff this month, hand me a clearly scoped piece of it and I'll disappear into the background. You keep the relationship, the margin, and the credit.

White-label by default

I don't contact your client and my name doesn't appear anywhere. The work ships as yours.

Your margin is known up front

A fixed quote per project, before you commit to your own client. No hourly drift eating the difference.

Demos you can forward

A recorded demo each week and a live preview link, which you can send on as your own progress update.

Built for design-led studios

Particularly useful if you sell beautiful product design and don't employ application engineers.

Talk about overflow

Happy to start with one small project to see whether we work well together.

The whole stack

"Complete" means I take the software all the way to production.

Not a repository that still needs a backend developer, a DevOps engineer, and somebody who knows how App Store submission works. I build the product and take it through deployment.

Product & interface

  • Product flows and interaction design
  • Responsive interface implementation
  • Component systems and platform conventions
  • React and Next.js on the web
  • Native iOS with Swift and SwiftUI
  • Native Android with Kotlin and Compose
  • Flutter for one codebase, four platforms
  • Marketing pages and store listings

Backend & infrastructure

  • TypeScript APIs on AWS, defined as code
  • Serverless functions, queues, and storage
  • SQL and DynamoDB data modelling
  • Accounts, sign-in with Apple and Google
  • Offline-first sync and local storage
  • Monitoring, alerting, and cost control
  • CI, staged environments, release pipelines

AI & money

  • Claude and OpenAI, with failover between them
  • Retrieval over your own documents and data
  • Extraction: messy sources to structured records
  • Evaluation harnesses, so quality is measured
  • Token budgets and spend guardrails
  • Stripe subscriptions and one-off payments
  • App Store and Google Play billing
Nick Schirmer
Who you'd be working with

Sousy Studio is Nick Schirmer.

One senior full-stack developer. You work with me directly, not with an account manager in front of contractors you never meet.

I've spent years building software professionally, and the last stretch of it shipping four of my own products end to end. That is a different skill from writing good code. It means deciding what to leave out, getting through app review, wiring up billing that reconciles, and dealing with the problems that only appear once real people use the thing. Every project on this page went through that alone.

So that's what you're hiring: someone who has done the whole job before, and who can quote a fixed price because he knows how long it takes.

Next step

Tell me what you're trying to launch.

A paragraph is enough to start. I'll reply with whether it fits a sprint, what it would cost, and when it could ship, usually within a day and without needing a discovery call first.

nick@sousy.com

Currently taking one to two projects a month. Agencies and studios: start here.