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Yo1 Engineering

Services

An app your users actually keep on their phone

A mobile app makes sense when it solves something a website cannot - offline access, push notifications, phone-first speed, or a daily-use habit. We build iOS and Android apps people actually use, not just install and forget. From flow definition to App Store and Google Play publishing, the focus is a product that lives on the phone - not a "small website".

What's included

01

iOS & Android development

One codebase (React Native) for both platforms - faster and more cost-effective than two separate native teams, unless you have a clear reason to go fully native.

02

Mobile-first UX

Flows and screens designed for touch and small screens, with clear actions - not a ported desktop layout that confuses people on a phone.

03

Push notifications

Bringing users back when the message is relevant to their task, with respect for frequency and context - not random spam.

04

Backend integration

Connecting to your existing API or building a new backend for accounts, data, sync, and notifications as part of the project.

05

Store publishing

The full App Store and Google Play publishing and update process - listings, review requests, and early post-launch support.

06

Post-launch maintenance

Updates for new iOS and Android versions, fixes, and small improvements so the app stays stable on real devices over time.

Especially useful for

  • Businesses that need constant, fast contact with users
  • Startups building a product for mobile users first
  • Companies with field teams that need an internal app

How we work

  1. 1

    Defining flows & features

    We clarify who uses the app, which jobs it must finish, and what belongs in v1 versus later - with a clear reason for opening the app again.

  2. 2

    UX design

    We design flows and screens for mobile context - clear actions, less friction, no desktop habits - and align them with technical constraints before development.

  3. 3

    Development & testing

    We build with React Native, test on real devices, and check edge cases (network, session, push) before submitting for review.

  4. 4

    Store publishing

    We prepare store listings, handle Apple and Google review, and support the first post-launch updates, with maintenance agreed up front.

See the full process →

What a mobile app really means (and when it makes sense)

A mobile app is not automatically the "next step" after a website. It is a product with its own rules: touch, small screens, interruptions, notifications, battery, and store policies. It makes sense when you need ongoing user contact, offline work, field workflows, or an experience a site cannot reliably deliver.

If the need is mostly informational - a catalog, brochure, or blog - a strong responsive site or PWA is often better. Then an app becomes an expensive brochure: installed once, opened rarely, while budget goes to OS maintenance. That is why we define why someone would open the app a second and third time first.

Typical good fits: products with accounts and daily use, internal apps for field teams, bookings and status where phone speed matters, or startups building mobile-first. In every case, v1 must finish a clear user job - not a "nice to have" list.

Common mistakes and wrong expectations

The first mistake is porting desktop design to the phone. The second is an oversized MVP: camera, chat, maps, payments, and admin all at once. The third is ignoring store rules and review - launch is not done when the code "works in a simulator".

The fourth mistake is neglecting the backend: accounts, data, push, and sync almost always need an API. The fifth is expecting the app to grow an audience by itself - without a reason to return and without channels (SEO, ads, content), installs stall.

The sixth mistake is budgeting only to publish day, with no maintenance. iOS and Android change; stores add rules. An app without update budget ages fast or fails on newer devices.

What drives cost, timeline, and results

Cost and timeline depend on the number of flows and screens, offline needs, push, payments, maps, camera, and whether a ready API exists. One codebase (React Native) usually speeds iOS + Android versus two fully native teams - unless you have a strong reason to go native.

Google Play review is often faster (days); Apple can take longer - that belongs in the launch plan. Speed also depends on your decisions: store copy, test accounts, design assets, Apple/Google account access. Delays there move the publish date more than most people expect.

Results are not install count alone. Retention, completed jobs in the app, and whether the product solves the user job matter more. We measure success through usage and business outcomes we can track - not only "live in the store".

Realistic expectations for v1 and after launch

The first version should be good enough that people use it, not perfect. A narrow, clear flow beats half-finished modules. After publish come real devices, real networks, and real feedback - we plan room for fast fixes in the first weeks.

We do not promise viral growth. We promise a solid product, clean mobile UX, and support through the store process. If a PWA or stronger mobile site is the better move, we will say so before you spend budget on the wrong format.

Maintenance is not an optional "later". We agree it up front: OS updates, small improvements, crash monitoring. That keeps the app reliable while the feature list grows in later cycles.

How collaboration works through store publishing

We start with flows and features: who uses the app, which jobs it must finish, what belongs in v1. Then we design UX for touch and small screens - clear actions, less friction, no desktop habits. We build with React Native (unless we agree otherwise) and test on real devices.

Before release we prepare store listings, screenshots, privacy policies, and accounts. We follow Apple and Google review, respond to requests, and support the first updates. If you also need a web app or marketing alongside the mobile product, we plan that as one system - not an isolated "app project".

At the start we agree what success means: completed bookings, active field reports, repeat opens. Without that definition it is easy to chase the wrong feature. With it, delivery has a clear rhythm from idea to store and support.

Why Yo1

We took the Vacabee mobile app from idea to launch - we know a mobile app isn't a small version of a website, but a product of its own with its own rules.

Frequently asked questions

iOS, Android, or both?

We usually recommend React Native - one codebase for both platforms, unless you have a specific reason to go fully native (for example highly platform-specific features).

How long does App Store approval take?

Google Play is usually faster (1-3 days); Apple review can take up to a week or longer with extra requests - we factor that into the launch plan.

Do I need a backend with the mobile app?

Almost always yes - accounts, data, notifications, sync. We can connect an existing API or build the backend as part of the project.

What does maintenance cost after launch?

It depends on update frequency, crash fixes, and OS changes. We plan maintenance up front because stores and devices do not stand still after release.

When is a responsive site or PWA better than a native/React Native app?

When the need is mostly informational or occasional, and there is no strong reason for store presence, offline work, or push. We assess that early so you do not spend budget on the wrong format.

Do you help with Apple Developer and Google Play accounts?

Yes - we guide you through account setup, certificates, listings, and store requirements. Access and legal ownership stay with you as the app owner.

How long does mobile app development take?

From several weeks for a focused MVP to several months for more complex flows and integrations. You get a concrete range after v1 scope and backend readiness are clear.

Do you also build internal mobile apps for employees?

Yes - field teams, inventory, on-location reports. There a reliable workflow often matters more than marketing store listings, but publishing and maintenance still apply.

Ready to start your project?

Book a free 30-minute consultation - no obligation, just a conversation about what you actually need and how long it would take.