Custom Software Studio, Singapore

Custom software,shipped in weeks.

No account managers. No outsourcing. One builder, fully accountable.

Let's talk See the work

RoxPacer HYROX race pacer app screenshot

The Work

Five apps. Live in the App Store.

5iOS apps shipped

1Client build delivered

100%Fixed-quote projects

WeeksNot months

iOSwatchOSFirebaseNext.jsReact NativeSocket.IO

Client Build

Paper check-ins replaced with GPS-verified field tracking.

Before

Chinatown Foods field reps logged store visits on paper. No visibility on whether visits happened. No way to verify timing or location.

After

Check-in requires GPS validation within the geofence of each outlet. Every visit gets a selfie. A CSV lands in the inbox at 10pm every night. No chasing, no guessing.

FieldCheck GPS check-in screen on mobile

S$4,500Fixed quote, no surprises

WeeksFrom brief to production

Daily CSVAuto-generated, 10pm SGT

FieldCheck dashboard showing field rep activity

Chinatown Foods Pte LtdNext.js + Firebase + Vercel

The Work

Apps I have shipped.

RoxPacer

HYROX race pacing with real-time split tracking on iPhone and Apple Watch.

iOSwatchOSHealthKit

View on App Store

DayOne: Workout Log

Structured workout logging with progressive training plans and Apple Health sync.

iOSFirebasei18n

View on App Store

Mr White

Real-time multiplayer party game. One imposter. Everyone else has to find them.

iOSMultiplayerSocket.IO

View on App Store

Beacon

Worship team coordination app for service planning and team communication.

iOS

View on App Store

FieldCheck

GPS-verified field sales check-in for Chinatown Foods. Private client build.

Web AppNext.jsFirebase

Dearlie: Couple Love Notes

Love notes couples draw or write, delivered straight to the partner's lock screen.

iOSWidgetsFirebase

View on App Store

What I Build

From iOS to web to real-time backends.

Every project in the portfolio required different tools. That range is intentional.

iOS + watchOS

RoxPacer: SwiftUI, HealthKit, Watch companion

Real-time multiplayer

Mr White: Socket.IO, game state machine, reconnection

Firebase full-stack

DayOne, Mr White, FieldCheck: Firestore, Auth, Functions

Cross-platform mobile

DayOne (React Native), Mr White (Expo + NativeWind)

Payment integration

RoxPacer (StoreKit 2), DayOne (IAP + paywall), Mr White (RevenueCat)

Geolocation + mapping

FieldCheck: Haversine, Google Maps geocoding, GPS validation

Analytics + data viz

DayOne: 1RM, consistency grid; RoxPacer: post-race HR zones

i18n

DayOne: 46-edge translation system

Backend + server logic

Mr White (Node.js/Socket.IO), FieldCheck (Next.js API, cron)

Automated reporting

FieldCheck: daily CSV, cron, photo cleanup

Testing

Mr White: E2E (full flow, reconnection); RoxPacer: unit tests

How I Build

Scope. Quote. Build. Ship.

Fixed quote before we build, no surprises. Weekly demos so you always know where we are.

Discovery

We scope it together.

One call. You explain the problem, I ask the hard questions. No NDA required to have a real conversation.

Fixed Quote

You get a price before I start.

Fixed quote before we build, no surprises. Scope is locked. If scope changes, we discuss it before any work happens.

Build

Weekly demos, real progress.

You see working software every week. Not slide decks, not status reports. The actual product, on a real device.

Ship

Launched. Handed over. Running.

Full handover: documentation, credentials, and a system your team can run. Your data is always yours, exportable anytime. I stay available for questions.

Discovery

We scope it together.

One call. You explain the problem, I ask the hard questions. No NDA required to have a real conversation.

Fixed Quote

You get a price before I start.

Fixed quote before we build, no surprises. Scope is locked. If scope changes, we discuss it before any work happens.

Build

Weekly demos, real progress.

You see working software every week. Not slide decks, not status reports. The actual product, on a real device.

Ship

Launched. Handed over. Running.

Full handover: documentation, credentials, and a system your team can run. Your data is always yours, exportable anytime. I stay available for questions.

Who Builds It

Desmond de Moussac. Builder, not an agency.

I build custom software for Singapore businesses that need something specific and want it done properly. Fixed quotes. Real timelines. One person accountable from brief to launch.

Before this, I spent years in product and engineering at scale, including systems used daily by 20,000+ people at Changi Airport Group. That context shapes how I scope: I build things that need to work reliably, not just look good in a demo.

I am based in Singapore. Projects are managed directly. You deal with the builder, not an account manager.

Singapore-basediOS + Web + BackendCustom builds S$5k-20k

Get In Touch

Ready to scope your project?

Drop me a line. I reply same day. No intake forms, no sales calls. Just a direct conversation about what you need.

Let's talk

Or email directly: desmond@mouss.ac