← All servicesS·03 · Product engineering

Web & Mobile Apps.

Crafted web and mobile products — fast, accessible, and indistinguishable from the best apps your users already love.

We ship consumer-grade apps that businesses actually run on. From white-label mobile banking used by lakhs of members to AI-powered healthcare apps in the US market, we obsess over performance budgets, offline behaviour, and the tiny interactions that separate a tool from a product.

Platforms
iOS · Android · Web
Offline
Works without signal
Releases
Staged rollouts

What you walk away with

  • Apps in the stores

    Signed iOS and Android builds published under your accounts, plus the web app on your domain.

  • A clickable prototype first

    The flows that make or break the product, in real users' hands within the first few weeks.

  • One design system

    Components, colour, type and motion rules shared across iOS, Android and web.

  • A release pipeline you own

    CI builds, test tracks, crash reporting and analytics wired in from the first build.

Capabilities

What we build
under this service.

Each engagement is scoped to your workflow, your constraints, and your users — but these are the capabilities we bring to the table.

01

iOS & Android

Native-quality mobile apps built on Swift, Kotlin, React Native, or Flutter — whichever serves the user best, not what's trendy.

  • Native modules when it matters
  • Offline-first data sync
  • Biometric auth and deep-linking
02

Progressive web apps

Web apps that install, work offline, and feel native — without an app-store release cycle slowing you down.

  • Service workers and caching
  • Push notifications
  • Lighthouse 95+ on real devices
03

White-label platforms

One codebase, many brands. Per-tenant theming, feature flags, and release channels so each customer ships on their own cadence.

  • Tenant isolation
  • Theming and branding
  • Staged rollouts
04

Design-led engineering

Design and engineering as one team. Motion, accessibility, and performance considered from day one, not bolted on at the end.

  • WCAG 2.2 accessibility
  • Motion and micro-interactions
  • Cross-platform design system
Reference architecture

How a modern app
is wired together.

A reference shape for a booking or banking app that has to work on a weak signal. Each device keeps its own copy of the data; one API layer serves every screen; releases go out in stages.

DevicesAPI layer · CodeLogsCore & partnersDelivery & opsonlinerefreshpush to other deviceseventskill switchsignediOS appSwift · FlutterAndroid appKotlin · FlutterWeb / PWANext.jsOffline storeEncrypted on deviceSync queueRetry · orderingMedia CDNImages · videoAPI / BFFREST · GraphQLFeature flagsRemote configAuthOAuth2 · biometricsAPNs / FCMPush deliveryDomain servicesBookings · usersDatabasePostgreSQLPaymentsStripe · RazorpayCrash & analyticsCrash-free · funnelsCI buildsTest · sign · shipStore tracksTestFlight · Play
  • Channel / app
  • Data store
  • Service
  • Gateway / edge
  • Your systems / partners
  • Ops & governance
  • Hover or tap any block for detail

A typical shape, not a template. Every engagement starts by drawing this for your systems.

In the product

One booking,
two screens.

A customer books a test on their phone. The operations team sees it land on the dashboard, with the health of the current release beside it.

ops-console / bookings / today
Coastal Diagnostics · Operations

Today’s bookings

Tue 14 OctLive
Bookings today128+1 just now
Home collections74
Booked via app80%
Bookings / hour
Bookingsauto-updating
SlotPatientTestChannelStatus
08:30Anita S.ThyroidiOSNew
08:00Rahul P.Full bodyAndroidConfirmed
08:00Meera K.HbA1cWebCollected
07:30Joseph D.Vitamin DiOSCollected
07:30Fathima N.ThyroidAndroidCollected
07:00Suresh B.Full bodyiOSCollected
Release healthv4.12.0
Crash-free sessions99.8%
  • iOS · build 2187Live
  • Android · build 2187Staged
  • Rollout20%
  • Web · deployed 09:12Live
flag · new-slot-picker
9:41
Good morning, Anita
Book a test
PopularDiabetesHeart
  • Full body checkup72 tests · fasting
    ₹1,499
  • Thyroid profileT3 · T4 · TSH
    ₹499
  • HbA1c3-month sugar average
    ₹299
  • Vitamin D & B122 tests
    ₹899
‹ Tests
Thyroid profile
T3 · T4 · TSH · no fasting₹499
Pick a day
Mon13Tue14Wed15Thu16
Pick a time
07:0007:3008:0008:3009:0009:3010:0010:3011:00
Home collection
Continue
‹ Slot
Confirm booking
Test
Thyroid profile
When
Tue 14 Oct · 08:30
Where
Home · Malpe
Patient
Anita S.
Test
₹499
Home collection
Free
Total
₹499
Pay withUPI · anita@okbank
Pay ₹499
You’re booked

Tue 14 Oct · 08:30 · Home collection

Booking BK-20417
RK
Ravi K. will collectYou’ll get a call 30 min before
Add to calendar
Coastal DiagnosticsBooking confirmed for Tue 08:30
  1. 01Built for thumbs

    Large tap targets, clear loading states and feedback on every action, checked on real devices.

  2. 02Live in the back office

    New bookings appear on the operations dashboard as they happen, without anyone pressing refresh.

  3. 03Releases you can see

    Every build shows its rollout stage and crash-free rate, so a bad release gets paused, not discovered.

Illustrative screens. Names and figures are sample data.

Our approach

How we
actually deliver.

01

Discovery and prototyping

We prototype the two or three flows that make or break the product — and get them into real users' hands within a few weeks.

02

Iterative build

Two-week increments, TestFlight and internal APKs on every milestone, analytics and crash reporting wired from the first build.

03

Launch and scale

Store listing, reviews, crash triage, and a roadmap based on real usage — not imagined personas.

Engineering standards

Built in from v1,
not bolted on later.

Performance

  • Performance budget set for every screen
  • Lighthouse 95+ on real devices for web
  • Images and media resized and served from a CDN
  • Start-up time and frame rate checked in CI

Accessibility

  • WCAG 2.2 AA as the baseline
  • Screen-reader labels on every control
  • Dynamic type and contrast checks
  • Reduced-motion alternatives for animation

Release & quality

  • Automated tests on every merge
  • TestFlight and Play internal tracks before launch
  • Staged rollouts with a kill switch
  • Crash reporting from the first build
Where it’s used

Real problems.
Real deployments.

Fintech

White-label mobile banking

iOS and Android apps used by members of 50+ co-operative banks — UPI, statements, loans, requests. Per-bank theming out of the box.

Healthcare (US)

AI-powered blood report app

A consumer app analysing 10,000+ biomarkers per patient, settled through Stripe, with a paired doctor portal for care teams.

Logistics

Live tracking for transport

Book trucks, track shipments, manage fleet ops — available on both app stores and used daily by logistics operators.

Technology

The toolkit
we reach for.

  • iOS & Android
    • Swift
    • Kotlin
    • Flutter
    • React Native
  • Web
    • Next.js
    • React
    • TypeScript
    • Tailwind CSS
  • API & data
    • Node.js
    • PostgreSQL
    • Redis
  • Payments
    • Stripe
    • Razorpay
  • Delivery
    • Docker
    • Jenkins
    • AWS
Questions

Asked on
every first call.

Native or cross-platform: which should we pick?

It depends on the product. Flutter or React Native suits most business apps and keeps one codebase. We go native in Swift and Kotlin when the app leans on device hardware, heavy animation or platform features. We recommend one after discovery and explain why.

Will the app work without internet?

If it needs to, yes. We design offline-first: data is kept on the device, changes queue up and sync when the connection returns, and conflict rules are agreed with you before we build.

Who handles App Store and Play Store submission?

We do: store listings, screenshots, review notes and privacy forms. Apps are published under your own developer accounts, so you own them outright.

Can one app be rebranded for many clients?

Yes. Our white-label setup runs many brands from one codebase, with per-brand theming, feature flags and separate store listings. Our mobile banking app works this way for 50+ co-operative banks.

What happens after launch?

We stay on for OS updates, store policy changes, crash triage and the roadmap, releasing in two-week increments or on the cadence you choose.

Have a project in mind? Let’s talk.

Tell us where you are today and where you’d like to be. A 30-minute discovery call is usually enough for us to know if we can help — and if we can’t, we’ll point you at someone who can.