Web and Mobile Apps Your Customers and Field Staff Actually Use Every Day
GullySystem designs and builds web and mobile applications for Indian businesses — customer portals, booking and self-service, and Android and iOS apps for field and branch staff — published in your own accounts and built to work on entry-level phones.
- Built for entry-level Android phones and weak networks
- Published under your own Play Store and App Store accounts
- Source code, signing keys and documentation handed to you
We build the apps Indian businesses put directly in front of people: parent and student apps for schools and coaching institutes, client document portals for professional firms, driver and technician apps for service and transport operators, booking and self-service for clinics, service centres and membership businesses, and buyer portals for builders and dealers. Some of that work is a first app for a business that has only ever had a phone number. Some of it is replacing a website squeezed onto a phone screen, or reviving an app whose developer account and signing key were left with a previous vendor.
Is Everything Your Customers and Staff Need Still Locked Inside Your Office?
Field Staff Report the Day’s Work on WhatsApp
Technicians, drivers and site supervisors send photos, voice notes and half sentences into a group. Someone in the office reads the group at night and types out what they think happened. When a customer asks whether the visit was made at all, what you have is a chat message and a memory rather than a time-stamped record of who was where.
Every Copy Your Customer Loses Becomes Your Staff’s Work
A receipt, a test report, a warranty card, a signed agreement, last year’s statement — the customer had it once, mislaid it, and now rings you for it. Someone opens a physical file or scrolls back through a year of chat to send it again, and because nobody records what went out, the next request starts the same search from the beginning.
Every Change to a Booking Comes Back to Your Front Desk
Slots are given out on the phone, so every reschedule, cancellation and reminder is another phone call. A freed slot stays empty because nobody had time to ring the next person waiting, reminders are typed out one message at a time until one is missed, and you learn about a no-show when the chair, bay or doctor is already idle.
There Is Nothing of Yours on Your Customer’s Home Screen
Your website exists, but reaching it means hunting for an old link, logging in again and pinching at a page laid out for a monitor. Nothing sits on the phone home screen, no notification can reach the customer, and between one visit and the next your business is a saved link nobody goes looking for.
Entries Made Where There Is No Signal Get Typed In From Memory
Basements, godowns, factory sheds, highways and village routes are where your work happens and where the network is weakest. The entry made there does not save, so your staff scribble it on paper and key it in at night — and the readings, photos and timings that reach your records are the ones somebody could still remember.
A Month After Launch, the Register Is Back on the Counter
The app asked for a screenful of taps where the register asked for one line, it demanded fields the staff member cannot know at that moment, and nobody made it worth their while. Your team has quietly gone back to paper, and you are still paying for a system they have stopped opening.
Your App Is Live and You Cannot Change a Word in It
The rates, timings and phone numbers inside it are last year’s, iPhone users say it will not install, and the store keeps flagging the listing. The Play Console and Apple accounts stand in a former vendor’s name and the signing key is with them, so even a one-line correction is a negotiation with someone who has moved on.
None of this is fixed by adding another screen to your back-office software. It is fixed by giving each group of people — customers, field staff, branch staff — an app built for the phone in their hand and the conditions they use it in.
Apps Built for the Phone in the Hand, Not the Demo on a Laptop
We design and build the web and mobile applications your customers and staff use directly: a self-service portal, a booking flow, a field app, a branch app. We start by watching how the job is done today — on a counter, on a bike, at a site — and design screens that are faster than the register they are replacing.
Designed for the User, Not the Org Chart
A customer sees their own bookings, bills and documents. A technician sees today’s visits and nothing else. A branch manager sees exceptions. Each role gets a short screen built for one job instead of one crowded screen built for everybody.
Works Where the Network Does Not
Entries, photos, readings and signatures are captured on the device and synced when the connection returns, with clear on-screen status so the user knows what is saved and what is still waiting.
Fewer Taps Than the Register
Defaults, last-used values, dropdowns instead of typing, camera instead of description, and regional language where it helps. If the app is slower than paper for the person doing the work, it will not be used, so speed of entry is a design requirement.
Published and Owned in Your Name
Play Console and Apple Developer accounts, the signing key, the app listing and the source code sit with your company, so releases, updates and future changes never depend on someone else’s login.
What Changes Once the App Is in People’s Hands
Focus on business value before discussing technology. Here is what your team accomplishes in week one.
Customers Hold Their Own Copies
Receipts, reports, agreements, statements and past job history sit inside the customer’s own login and download whenever they want them, and your team can see what was issued and when instead of searching for it again.
Proof of the Visit Exists Before the Technician Leaves
Check-in time, location, photographs and the customer’s own acknowledgement are attached to the job at the site, so a questioned visit is settled from the record rather than from a chat group and somebody’s recollection.
The Record Is What Happened, Not What Was Remembered
Entries made in a basement, a godown or on a highway are held on the phone and uploaded when the connection returns, so nothing in your records depends on a note copied out hours later.
A Freed Slot Fills Itself
Customers book, reschedule and cancel in the app against real availability, an opening is offered to whoever is waiting, and confirmations and reminders go out on their own instead of being typed at the desk.
Entry Is Quicker Than the Paper It Replaces
Each screen is measured against the slip or register it removes, tried by real users before development, and watched by role after launch, because a screen slower than paper will lose to paper.
You Can Publish an Update Without Asking Anyone
Store accounts, the signing key, source code and documentation sit with your company, so a rate change, a fix or a new developer next year is a decision you take rather than a negotiation you have to open.
What Web and Mobile Application Development Includes
Everything required from operational discovery to production deployment and long-term maintenance.
User Research and App Scope
We follow the people who will use it — a technician on a route, a front-desk operator, a customer on a phone — and turn what they actually do into a screen list, a role matrix and a scope you sign.
Mobile Interface Design and Prototype
Screen flows and a clickable prototype opened on a real phone, tested with two or three of your own users before development starts, when a change still costs a conversation.
Android and iOS Applications
Store-ready apps built with React Native or Flutter, or in Kotlin and Swift where the device features demand it, sized and tuned for entry-level handsets rather than flagship phones.
Customer Self-Service Portals
A secure login where your customers see their orders, jobs, dues, receipts, documents and complaint status, and can raise a request without ringing your office.
Booking, Scheduling and Queue Apps
Slot and appointment booking against real availability, rosters and capacity, with confirmations, reminders, rescheduling, cancellations and a front-desk view of the day.
Field and Route Applications
Assigned visit lists, check-in with location, photo and reading capture, spare or material consumption, customer signature, and offline storage that syncs when the network returns.
Staff and Branch Applications
Counter, warehouse and branch screens for the tasks done standing up — quick entry, scanning, verification and handover — with role-based rights and a record of who did what.
Progressive Web Apps
An installable web app for cases where two store apps are not yet justified: it opens from a home-screen icon, works on any phone, and needs no download or store approval.
Backend, APIs and Admin Console
The server, database and documented APIs behind the app, plus an admin console where your team manages users, content, masters, notifications and app settings without calling us.
Notifications and In-App Messaging
Push notifications, WhatsApp, SMS and email tied to real events — booking confirmed, technician on the way, document ready, payment due — with delivery status recorded against the record.
App Store Publishing and Release Management
Store listing, screenshots, description, privacy policy, data-safety declarations, review responses and versioned releases, set up in your company’s own developer accounts.
Post-Launch Monitoring and Updates
Crash and usage monitoring, fixes for the issues real users hit, and the compatibility updates each Android and iOS cycle requires so the app keeps installing next year.
Apps We Build for Indian Businesses
Real-world business processes we configure and automate.
School and Coaching Institute: A Parent App
A school office spent every morning on calls about fee dues, attendance and circular copies, and receipts were reprinted on request. A parent app shows each child’s attendance, fee schedule, paid receipts, exam results, circulars and leave requests, with fees payable inside the app. Parents stop queuing at the counter for a printout, and the office keeps a record of who was informed and when.
Transport Operator: Driver App and Customer Tracking
A goods transport operator ran trip updates through phone calls to drivers, and consignors rang the office for status. A driver app captures loading, gate-out, breakdown and delivery proof with a photo and signature, holding entries offline on highway stretches, while consignors open a tracking link showing the current stage. The office stops relaying status and the delivery proof reaches accounts the same evening.
Facility Management Firm: A Resident App for the Buildings It Runs
A firm managing apartment complexes had one manager per property taking maintenance dues, complaints and visitor requests on his personal phone, and residents rang the proprietor whenever he did not pick up. A resident app issues the monthly maintenance bill with online payment, takes complaints with a photo and shows the ticket moving to closure, circulates notices, and lets a resident approve a visitor at the gate. The manager stops being the switchboard, and the firm can show each association what was raised and what was closed.
Builder: A Portal for Booked Buyers
A developer’s sales office fielded daily calls about payment schedules, demand letters, construction progress and possession documents. A buyer portal shows each unit’s payment plan, raised demands and receipts, dated site progress photographs, uploaded agreements and approvals, and a snag ticket after handover. Buyers get a single place for the answer, and the office gets a record of every demand and complaint.
Manpower Services Firm: Site Check-In and Coverage
A security and housekeeping contractor deployed staff across client sites and confirmed attendance by supervisor phone calls, so shortages were discovered after the client complained. A staff app takes geo-tagged shift check-in and check-out with a photo, flags an unfilled post to the supervisor immediately, and gives each client a coverage view for their own sites. Billing is raised from attendance the system holds rather than from a register compiled at month end.
Car Service Centre: Booking and Digital Job Card
A multi-branch workshop took service bookings on the phone and rang customers for approval on extra work, often reaching them mid-meeting and losing bay time. A customer app books a slot against bay and technician availability, shows the estimate with photos of what needs attention, takes approval with one tap, and sends the ready-for-pickup and payment link. Approvals stop holding up the bay and the customer has a record of what they agreed to.
Is This Service Right for Your Business?
We partner with established businesses that have outgrown manual processes and want reliable systems.
Businesses Holding Records Their Customers Keep Asking For
Clinics, labs, workshops, institutes, professional firms and service companies whose customers need their own copy of a bill, report, agreement, due date or job status, and today can get it only by asking a staff member.
Companies With Staff Working Outside the Office
Technicians, drivers, collection staff, supervisors, surveyors and delivery teams whose work is currently reported by phone call, WhatsApp photo or a slip handed in at day end.
Appointment and Slot-Based Operations
Businesses selling time — consultation slots, service bays, sample collection, classes, court or hall bookings — where the diary at one desk is the constraint.
Businesses With Continuing Customer Relationships
Schools, gyms, societies, AMC and subscription services, hostels and lenders whose customers return every month and need their own view of dues, documents and history.
Companies With a Back-Office System and No Front End
You already run an ERP, a billing package or a custom system internally, and now need a customer or field app that reads from and writes to it instead of a second set of records.
When an App Is Not What You Need Yet
If you have a small customer list that is happy on WhatsApp, an app will not be opened often enough to earn its keep. If the requirement is one form, a responsive website or an installable progressive web app is cheaper than two store apps and needs no download. If your internal records are still in spreadsheets, build the system that holds the data first — an app on top of nothing is only a nicer way to collect what nobody is processing. And if the idea itself is unproven, a focused first version to test demand is the right spend before a full app. We will say so before quoting.
Enterprise Capabilities in Plain Business Terms
OTP and Password Login With Session Control
Mobile-number OTP, passwords or fingerprint sign-in, with device history, session expiry and immediate deactivation when a staff member leaves.
Role-Based Screens
Customer, technician, supervisor, branch and admin users each get their own navigation, fields and rights, so nobody scrolls past screens that are not theirs.
Offline Capture and Background Sync
Forms, photos, readings and signatures stored on the device when there is no network, uploaded automatically afterwards, with conflict handling and a visible pending count.
Camera, Scanning and Signature
In-app photo capture with compression for slow data, barcode and QR scanning, document scan and on-screen customer signature attached to the record.
Location and Geo-Tagged Check-In
Visit check-in and check-out with coordinates and time, route order for the day, and distance summaries where travel allowance depends on them.
Push, WhatsApp and SMS Notifications
Event-based alerts to the right person with deep links that open the exact booking, job or invoice inside the app rather than the home screen.
Booking and Availability Engine
Slots derived from real rosters, bays, capacity and holidays, with buffers, blocked periods, rescheduling rules and waiting lists.
In-App Payments and Receipts
UPI, cards and net banking through your own gateway account, with receipts, part payments and a downloadable statement for the customer.
Documents and Downloads
Invoices, reports, agreements and certificates generated as PDF in your format, stored securely and available to the right customer only.
Regional Language and Simple Interfaces
Interface text in the languages your users read, large tap targets, icon-led navigation and short forms for staff who are not comfortable typing.
Version and Update Control
Staged releases, an in-app update prompt and a minimum supported version, so customers cannot keep transacting on an outdated build.
Crash, Usage and Adoption Monitoring
Crash reports with the device and screen involved, plus usage by role and feature, so you can see which parts of the app are actually being used.
Our Structured 6-Step Delivery Process
A transparent path from your first conversation to a reliable production release.
User Discovery and Journey Walkthrough
We spend time with the people who will hold the phone — a technician on a route, a front-desk operator, a customer who currently rings you. From you we need access to two or three of those actual users, the list of questions your office answers every day, and any forms, job cards or registers they fill now.
Screen List, Roles and Scope
We define every screen, each user role and what it can see and do, the notifications, the offline behaviour and the platforms in scope — web, Android, iOS or an installable web app. You sign this document, and from you we need your logo and brand files, plus the content only your business can supply, such as terms, fee heads or service categories.
Prototype on a Real Phone
We design the interface and hand you a clickable prototype that opens on a phone, not a slide deck. From you we need a short session each with two or three real users to tap through it, and one decision-maker to approve the design so development starts on a settled screen list.
Development in Working Releases
We build the app, backend, APIs and admin console in milestones, and after each one we send a test build you can install and use in real work. From you we need those test users to actually use it during their working day, and credentials for any system we must connect to, such as your billing software, gateway or messaging account.
Store Publishing and Pilot
We prepare the listing, screenshots, privacy policy and data-safety declarations, and publish under your accounts. From you we need a Google Play and Apple Developer account in your company name — we guide you through creating them — along with the company documents those accounts require, and one branch or one team willing to run the pilot before everyone else joins.
Rollout, Training and Support
We train each user group on their own screens, supply short guides in plain language, and stay close through the first live weeks while usage settles. From you we need one internal owner for the app who collects feedback and decides priorities, so later updates follow real usage instead of individual requests.
What You Receive Upon Project Completion
Everything required to run, maintain, and expand your software without vendor lock-in.
Connects With the Systems You Already Rely On
We build bridges between your software so you don't have to replace functional existing tools.
Notifications and Messaging
- Firebase push notifications
- WhatsApp Business API
- Gupshup
- Twilio and SMS gateways
- Transactional email
Payments and Collections
- Razorpay
- Cashfree
- PayU
- UPI collect and QR
- Payment links and receipts
Business Systems
- Tally Prime / ERP 9
- Zoho Books and Zoho CRM
- Custom ERP and billing software
- Your existing website and database
Location, Identity and Storage
- Google Maps and geolocation
- Mobile OTP and Google sign-in
- S3-compatible document storage
- Digital signature and e-sign services
Selected for Reliability, Speed, and Longevity
Technology chosen to match your operational scale and long-term maintainability.
Mobile
Web and Portals
Backend and APIs
Data and Offline Storage
Delivery and Monitoring
Why Business Owners Choose GullySystem
We Design for the Worst Phone, Not the Best
Screens are checked on entry-level Android handsets with limited storage and patchy data, because that is what your technicians, retailers and customers are carrying.
Adoption Is Part of the Brief
We count the taps against the register the app replaces, test with real users before build, and watch usage after launch. An app nobody opens is a failed project even if every feature works.
Honest About Web Versus Store Apps
If a responsive site or an installable web app will do the job, we say so rather than selling two store applications, their review cycles and their yearly account fees.
One Team for App, Backend and Console
The mobile app, the server behind it and the admin console are built by the same team, so a change to a form does not need three vendors to agree.
Store Accounts and Keys in Your Name
We set up publishing under your own company accounts from the start, hand over the signing key, and document the release process so you are never locked out of your own app.
Support Through the OS Cycles
Android and iOS change requirements every year. We stay with the app through those updates so it keeps installing and keeps meeting store policy after the project is over.
Flexible Engagement Options
Choose an engagement model that matches your operational scope, budget, and timeline.
Fixed-Scope App Build
Best when the screen list, roles and platforms are settled. Scope, designs, integrations and acceptance criteria are agreed upfront and the commercials move only if the scope does.
Staff App First, Customer App Next
Put the internal app into daily use first, let real usage settle the data and the process, then open the customer-facing app on a foundation that has already been proven inside the business.
Web App Now, Store Apps When Justified
Launch as a responsive or installable web app, which needs no download and no store review, and add Android and iOS builds once usage shows which features genuinely need a native app.
Ongoing App Team
For businesses with a live app and a continuing roadmap: regular releases, crash monitoring, store compliance and new features handled by a team that already knows the product.
Frequently Asked Questions
Straightforward answers to the questions owners ask before getting started.
Do we actually need a mobile app, or is a mobile-friendly website enough?
A website is enough for most first-time visitors, and an app earns its place when the same people come back often. Choose an app when users open it weekly or daily, when you need the camera, location, offline entry, barcode scanning or push notifications, or when staff work where the network is unreliable. Choose a responsive website or an installable progressive web app when the task is occasional — a form, an enquiry, a one-time booking — because nobody downloads an app they will use twice a year. We will tell you which side your requirement falls on before quoting.
What does a web and mobile application project include?
A working product, not just an app file. That means user discovery and a signed screen list, interface design and a clickable prototype, the app itself for web, Android or iOS, the backend, database and APIs behind it, an admin console for your team, the integrations and notifications in scope, offline capture where the work needs it, store publishing under your accounts, source code and signing keys, and training with post-launch support.
How is the cost decided?
Cost follows scope rather than a rate card. The main drivers are the number of user roles and screens, how many platforms are involved — web only, or web with Android and iOS — how complex the rules behind the screens are, whether offline working is required, how many external systems must be connected, whether payments are handled inside the app, and how much design work the interface needs. A staff app covering one task and a customer app covering an entire service relationship are different projects. We give an itemised proposal once the screen list is agreed, so you are approving a defined deliverable.
What decides how long it takes?
Timeline is driven by the size of the first release and by decision speed on your side, not by our capacity. The biggest factors are the number of screens and roles, whether both Android and iOS are in scope, offline requirements, integrations with systems whose credentials and approvals sit outside our control, and the app store review cycle for the first submission and every update afterwards. In practice the most common delay is waiting for design approvals and for developer accounts to be created, so a phased release that puts one user group live early is usually the faster route.
Should the app be native, or built with React Native or Flutter?
For most business apps, React Native or Flutter is the sensible choice: one codebase serves Android and iOS, which keeps both the build and every future update cheaper, and it handles camera, location, offline storage, scanning and notifications without difficulty. Native Kotlin or Swift makes sense when the app depends heavily on device hardware or background processing — continuous location tracking, Bluetooth devices, heavy media or specialised peripherals. We recommend based on what the app has to do, not on what we prefer to write.
Will it work on inexpensive phones and on poor network connections?
That is a design requirement, not an afterthought. We keep the app size small, compress photos before upload, load lists in pages rather than all at once, and test on entry-level Android handsets rather than only on new phones. Where the work happens in weak-signal locations, entries, photos and signatures are stored on the device and synced automatically when the connection returns, with a visible count of what is still pending so the user is never guessing.
Who publishes the app on the Play Store and App Store, and what do you need from us?
The apps are published under your own company accounts, and we do the work of getting them there. You will need a Google Play Console account and an Apple Developer account in your company name — we guide you through creating both — along with the company documents each requires and a publicly reachable privacy policy page, which we help you prepare. We handle the listing, screenshots, descriptions, data-safety declarations, review submissions and responses to any store queries.
Can the app connect to the software we already use?
Yes, and it usually should. We connect apps to Tally, Zoho, existing ERP and billing packages, your current website and database, payment gateways and WhatsApp Business through documented APIs, webhooks or a controlled bridge, so the app is a front end on the records you already keep instead of a second set of data. Where a system has no API, we handle the exchange through scheduled sync or structured file transfer. Where the connection work itself is substantial, our API and system integration service covers it.
How is customer and staff data protected inside the app?
Access is controlled by role, so a user reaches only their own records. Data is encrypted in transit and at rest, tokens rather than passwords are stored on the device, sessions expire, and a lost phone can be logged out remotely. We request only the device permissions the features genuinely need and declare each one honestly in the store listing, since both stores require a data-safety declaration that matches what the app actually collects. We sign a non-disclosure agreement before discovery begins.
Who owns the source code, the signing keys and the store accounts?
You do, entirely. On handover you receive the full source code repository, the app signing key and keystore, the backend and database, deployment documentation and intellectual property ownership. The Play Console and Apple accounts are yours from the day they are created, and hosting and gateway accounts can be in your name too. Losing a signing key is one of the few genuinely painful situations in mobile development, so we document and hand over the key as part of delivery.
How do you make sure our staff and customers actually use it?
Adoption is designed in and then checked. We test the prototype with real users before development, count entry steps against whatever they use today, and keep first-time screens short. At rollout we train each group on their own screens, supply short guides in plain language, and start with one branch or one team so problems surface small. After launch we watch usage by role and feature, and fix what the numbers show people are avoiding rather than what we assumed would matter.
What happens after launch — do apps need ongoing work?
Yes, more than websites do. Android and iOS release new versions every year, stores raise their minimum requirements, and an app that is not updated eventually stops installing or gets removed from the listing. After launch there is a warranty period covering defects, followed by an optional support agreement covering crash monitoring, store compliance and OS compatibility updates, small enhancements and new features at an agreed cadence. If you have an existing app from another vendor that is stuck, our software maintenance, support and rescue service is where that starts.
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Related Practices & Services
Custom Software and Product Engineering
The wider system behind the app — operations, masters, approvals and reporting — built around the way your business actually works.
UI/UX Design and Prototyping
Screen flows, interface design and clickable prototypes tested with real users before development budget is committed.
API and System Integration
Connect the app to your accounting software, ERP, payment gateway and messaging platforms so records move without anyone re-keying them.
MVP and Product Development
A focused first version to put an unproven idea in front of real users before committing the full app budget.