all servicesPRODUCT ENGINEERING

One stack from the databaseto the phone.

Most products eventually need three things: a mobile app, a web app, and a backend feeding both. The traditional route is three technologies, three codebases and effectively three teams, with every feature implemented twice and every change coordinated across all of them. We build all three in one language.

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WHAT'S INCLUDED

Front-end Dev

React, Next.js, TypeScript
Server components, SSR & ISR
REST APIs, React Query
Tailwind CSS, design systems
Core Web Vitals & SEO

Mobile Apps

React Native, Expo
iOS & Android from one codebase
Native modules & device APIs
Push notifications, deep links
Offline-first data
App Store & Play Store releases

Back-end Dev

Nest.js, Express.js, Node.js
TypeScript end to end
REST APIs, auth & permissions
PostgreSQL, MySQL, MongoDB
Prisma, TypeORM, Mongoose
Background jobs & integrations

QA & Automation

Technical testing
Functional testing
Exploratory testing
Cross-platform testing
Accessibility testing
Automated testing
Performance testing

What we build

Front-end, mobile, backend and testing, by one team rather than three.

Front-end: React, Next.js and TypeScript, server components, SSR and ISR, Core Web Vitals
Mobile: React Native and Expo, iOS and Android from one codebase, push notifications, deep links, offline-first data, App Store and Play Store releases
Backend: Nest.js, Express and Node.js, REST APIs, auth and permissions, PostgreSQL, MySQL and MongoDB, background jobs and integrations
QA: functional, exploratory, cross-platform, accessibility, performance and automated testing

Why one language shows up in your budget

Web in Next.js, mobile in React Native, backend in Nest.js, all TypeScript, in a single repository with shared packages between them. There is exactly one definition of what a Product, an Order or a User is, and all three import it. When the backend changes a field, the web and mobile code that depends on it fails to compile immediately, with a precise list of every affected spot.

In practice 30–50% of the code is shared, and it is precisely the part where bugs are most expensive: the data definitions, the rules, the calculations. The screens stay separate, because a good mobile interface and a good web interface are genuinely different.

One team across web, mobile and backend, with no waiting on a hand-off
Features cost less: the logic is written once, and only the screens are built per platform
Changes are safer: the compiler finds every place a change touches, across all three apps
Launching mobile-first stays cheap: a web app added later inherits the types and logic on day one

Do you actually need a custom backend?

Often not, and any agency that recommends one on every project is optimising for its invoice rather than your runway.

If your app mostly stores and displays data and the rules are simple, a managed backend like Firebase or Supabase is the right call. It saves a real share of the build and one to two weeks of timeline. If your product matches, calculates, pays out, approves or integrates with other systems, plan for a custom backend from day one.

Managed is enough: notes, habits, workouts, saved items, simple profiles, users seeing their own data
Custom is needed: complex business logic, money beyond a simple checkout, multiple roles with genuinely different permissions, integrations with other systems, data you must fully own

Taking over an existing product

We also inherit codebases: apps built by a previous team, products that have outgrown a managed backend, front-ends that need rebuilding without rewriting everything behind them. Migrating from Firebase to a custom backend is a normal, plannable project rather than a rewrite of your app.

Frequently asked questions

Can you build for iOS and Android at the same time?

Yes, and that is why we build in React Native: one codebase running natively on both, which is meaningfully cheaper and faster than building the same product twice.

Can you take over a codebase someone else wrote?

Yes. We start with a short review of what is there and what it would cost to keep versus replace, and you get that assessment before committing to anything further.

Do we need a custom backend or is Firebase enough?

If your app stores and displays data with simple rules, Firebase or Supabase is genuinely enough and saves both money and time. If it matches, calculates, pays out, approves or integrates, plan for a custom backend. If you are unsure, start managed and treat migration as a milestone rather than an emergency.

Which databases do you work with?

PostgreSQL most often, plus MySQL and MongoDB, accessed through Prisma, TypeORM or Mongoose depending on what the project needs.

Who does the testing?

We do: functional, cross-platform, accessibility, performance and automated testing, on real devices old and new, on both platforms, not only simulators.

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