Custom Mobile Applications for Field and Customer Use
An app for people who are not sitting at a desk — field technicians, delivery riders, salespeople and customers checking status on the move. GullySystem designs and builds it to work on ordinary phones and weak network coverage.
Overview
A mobile application is built for someone away from a desk: a technician on a job, a rider making a delivery, a salesperson visiting a dealer, or a customer checking a status from home. It uses what a phone can do that a browser cannot as easily reach — camera, GPS, push notifications and offline storage — and is installed once rather than opened as a link each time.
What a Mobile App Is Usually Built to Solve
Work Reported Late
A technician or rider currently reports status by phone at the end of the day, so billing and stock updates lag by hours.
No Proof of Work Done
Jobs are marked complete on trust, with no photo, signature or location to confirm the visit actually happened.
Field Staff Lose Signal
Areas with patchy network mean forms cannot be filled in real time using a browser-based tool alone.
What Goes Into a Mobile Build
Offline Data Capture
Forms, photos and signatures saved on the device and synced automatically once network returns.
Location and Camera Use
GPS check-in and photo proof attached to a job, visit or delivery record.
Job and Status Alerts
Job assignments, approvals and status changes reaching the phone without anyone making a call.
Low-End Device Performance
Interfaces kept light enough to run smoothly on entry-level Android handsets, not just the newest phones.
Platform and Technology Choice
If both Android and iOS are needed, we typically build with React Native or Flutter from one codebase — covered on its own page — to keep cost and maintenance down. Where a feature needs the absolute limit of device performance or hardware access, native Kotlin or Swift development, covered separately, is the better route.
Frequently asked questions
Do we need a mobile app or would a web application be enough?
If your users work from a desk or a fixed counter, a web application is simpler to build and update. A mobile app earns its cost when people are moving between locations, need the camera or GPS, or must keep working without network coverage.
What decides whether we need one platform or both Android and iOS?
Look at who is using it. Field staff and delivery teams on company-issued phones are usually all on one platform, most often Android, so a single build may be enough. Customer-facing apps generally need both, since you cannot predict which phone a customer owns.
What drives the cost of a mobile application?
Whether it targets one platform or both, how much offline capability it needs, how many device features such as camera, GPS or biometrics are involved, and how much backend and API work sits behind the app.
What decides how long the app takes to build?
The number of screens and workflows, whether the app must work offline, and how much testing is needed across different Android versions and device makes, since field phones vary far more than office computers.
Will the app work in areas with poor network coverage?
Where the workflow calls for it, we build offline-first: data is captured and stored on the device first, then synced when a connection is available, so a weak signal does not stop the work.
Who publishes the app and who owns the listing?
The app is published under your own Google Play and Apple developer accounts, so the listing, reviews and ownership stay with your business, not with us.
What do you need from us to begin the app?
The specific field or customer workflow the app should cover, access to any backend system it needs to read or write to, and a small group of intended users who can test builds before release.
Tell us what you need.
Send a short brief and one of our engineers will come back to you — usually the same day.
- No obligation
- We reply the same working day
- Your details stay private