Feature 01
SIMLESMobile + Travel-Tech20253 Months
SIMLES — Global Travel eSIM Connectivity App
Borderless travel connectivity in 190+ countries. Buy, install, and manage mobile data plans with one tap, no physical SIM, no roaming surprises. Services: Mobile App Development, Backend Engineering, FinTech Integration
FlutterDartLaravelMysqlStripeFirebase
Section 01 · Overview
Overview
SIMLES is a next-generation travel eSIM app that removes the biggest headache of crossing a border, staying online. Travellers, digital nomads, and business users can browse, purchase, and activate mobile data plans across 190+ countries directly from their phone, with no roaming fees, no airport kiosks, and no plastic SIM cards. Built on Flutter for true cross-platform parity and powered by a Laravel + MySQL backend with Stripe-secured payments, SIMLES packages the entire connectivity journey into a single flow: discovery, checkout, QR-based activation, top-ups, and real-time usage tracking. The result is a travel companion that turns the legacy $40B+ roaming market into a one-tap experience.
Feature 02
Instant eSIM QR activation, installed natively on iOS and Android in under 60 seconds.
Feature 03
In-app wallet, Stripe checkout, Apple Pay, Google Pay, coupons, and referral credits.
Feature 04
Real-time usage syncing with proactive low-data and renewal push notifications.
The Challenge · Problem Statement
Problem Statement
International connectivity is broken. The moment a traveller crosses a border, four recurring pain points hit at once: home carriers charge premium roaming rates, physical SIM kiosks at airports waste hours, comparing prepaid plans across foreign carrier websites is a trust nightmare, and once a SIM is installed there is no single place to track remaining data, top up, renew, or reuse plans on the next trip. A $40B+ roaming market still runs on a user experience designed in the 1990s.
User Painpoints
Crippling Roaming Charges
Carriers still bill premium rates for basic data, often forcing travellers to switch off mobile data entirely the moment their plane lands.
Physical SIM Friction
Hunting for airport kiosks, swapping tiny SIM cards, losing the home number, and navigating foreign-language paperwork eats hours of every trip.
Fragmented Plan Discovery
Comparing prepaid data offers means juggling carrier websites, currency conversions, and trust signals from brands the traveller has never heard of.
No Unified Management
Once installed, travellers have no single place to track remaining data, top up before a plan expires, or reuse the same product on the next trip.
How We Build · Design Process
Design Process
Our proven 4-step approach to delivering products that actually ship.
- Step 01
Discover
User research, stakeholder interviews, and competitive analysis to ground every decision in evidence.
- Step 02
Define
Product hypothesis, user stories, and a prioritized scope we can all sign off on before a pixel is drawn.
- Step 03
Design
Style guide, high-fidelity wireframes, and clickable prototypes validated with real target users.
- Step 04
Deliver
Production-grade UI, component libraries, and a fully documented system your engineers can ship fast.
Section 04 · Our Solution
Our Solution
How we solved each pain point — with outcomes, not ambiguity.
- Flagship Solution · 01
Smart Plan Discovery
Browse by country, region (Europe, Asia, MENA, Americas) or global plan. Filter by data, validity, and price, with an AZ-list search that makes 190+ destinations instantly scannable.
- Solution 02
Frictionless Checkout
Stripe-secured payments, saved cards, Apple Pay, Google Pay, an in-app wallet, referral credits, and a coupon engine, all wrapped in a two-screen checkout flow.
- Solution 03
Instant QR Activation
eSIM profiles generated at the moment of purchase. The app guides the user through native iOS and Android installation in under 60 seconds, with localized step-by-step visuals.
- Solution 04
Top-Up & Renewal Engine
Real-time usage syncing with proactive low-data push notifications via Firebase Cloud Messaging, plus one-tap top-up before plans expire.
- Solution 05
Trust + Loyalty Layer
Built-in referral program, multi-currency pricing, multi-language UI, and a full admin and reseller dashboard for B2B partners shipping eSIM under their own brand.
Section 06 · Visual System
Color Palette & Typography
The visual language guiding every pixel.
Color Palette
SIMLES Blue
#1F60A8
Horizon Navy
#0B1F3A
Connectivity Cyan
#22C8E8
Signal White
#FFFFFF
Soft Slate
#5B6776
Typography
Typography
Inter
Bold · Semi Bold · Medium · Regular · Light
Aa Bb Cc · 0 1 2 3 4 5 6 7 8 9
Tech Stack
Technology Stack
The production-grade stack we used to ship this product — and exactly how each piece pulls its weight.
Mobile
How We Use
Flutter 3.35 powers a single mobile codebase for iOS and Android with native-grade performance for plan browsing, checkout, QR install, and usage tracking.
Benefit
One engineering team ships and maintains both platforms at half the build cost, with pixel-identical UX everywhere.
Language
How We Use
Null-safe, strongly typed codebase using BLoC for predictable, testable state across every screen.
Benefit
Catches a whole class of bugs at compile time, keeping a financial flow stable at scale.
Backend
How We Use
REST API and admin core for users, orders, plans, the wallet ledger, eSIM provisioning, referrals, and the reseller dashboard.
Benefit
Mature, opinionated framework that ships business logic fast without inviting the kind of complexity that bites later.
Database
How We Use
Source of truth for users, orders, plans, wallet ledger, and audit trails, with foreign-key constraints and ACID guarantees on every payment write.
Benefit
Financial-grade data integrity, the same primitive that runs most production fintech platforms in the world.
Payments
How We Use
flutter_stripe integration handles card payments, Apple Pay, Google Pay, wallet top-ups, and refunds across 30+ supported currencies.
Benefit
Battle-tested PCI-compliant rails so the team focuses on the travel product, not on payment audits.
Auth + Notifications
How We Use
Firebase Auth + Google Sign-In + Sign in with Apple for frictionless onboarding. Firebase Cloud Messaging delivers purchase confirmations, low-data alerts, and renewal nudges.
Benefit
Production-grade auth and push in days, not weeks, with the SDK that mobile teams already trust.
DevOps
How We Use
Branch-based workflow, PR reviews, code quality gates, and a CI pipeline that ships signed iOS + Android builds on every release tag.
Benefit
Every change is peer-reviewed and rollback-ready, the bar a financial app on two app stores needs.
Outcomes · Results & Impact
Results & Impact
What SIMLES shipped — and what it delivered.
0+
Countries Covered
< 0s
Purchase to Active Data
0%
Cashless, Plastic-Free Activation
iOS + Android
Live in Both App Stores
