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Insum d.o.o. — Zadar, Croatia

Engineering mobile, web and backend products that scale.

Insum is a software development company building React Native apps, Next.js web apps and Node.js, Nest.js and Supabase backends — end to end.

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Our stack
  • React Native
  • React
  • Next.js
  • Nest.js
  • Node.js
  • Supabase
  • PostgreSQL
01 About us

A small team, engineered to ship.

Insum d.o.o. is a software development company based in Zadar, Croatia. We treat every product as a system worth engineering well — from the interface to the data layer underneath it.

We partner with founders and product teams to design, build and ship mobile apps, web apps and the backend systems that power them, favoring modern, proven, modern JavaScript tooling over passing trends.

Company record Registered
Legal nameInsum d.o.o.
D-U-N-S® Number672589336
OIB (Tax ID)93550942424
AddressUlica Rine Aras 3, 23000 Zadar, Croatia
  1. 01

    Precision

    Architecture, performance and edge cases get the same care as the visible interface.

  2. 02

    Clarity

    Plain communication, honest estimates and risks flagged early instead of discovered late.

  3. 03

    Momentum

    A small team with short feedback loops, shipping working software continuously.

02 What we build

One team across the entire stack.

From the user interface to the database underneath it — designed and built together as one coherent system.

Native-quality apps from a single codebase

Cross-platform iOS and Android apps built with React Native, tuned for performance and a polished, responsive interface.

  • iOS and Android from one codebase
  • Push notifications and offline-ready flows
  • Shared logic with your web app
React NativeExpo
03 Portfolio

Selected work, built to last.

Representative projects across mobile, web and backend engineering.

Planinar.net screenshot

Planinar.net

Web App

A community platform where hikers find local clubs, browse events and courses, and plan their next trail together.

Web AppCommunity
Visit site

Fleet Tracker

Mobile App

A React Native app with Supabase realtime channels so logistics teams can watch deliveries move on a live map.

React NativeSupabaseRealtime

Marketplace Dashboard

Web App

A Next.js admin console with role-based access, usage analytics and a component library built for speed.

Next.jsReactAnalytics

Community Booking App

Mobile App

A mobile booking experience with calendar sync and push notifications, built around a fast, intuitive interface.

React NativeNest.js

Ops Console

Backend

An internal Nest.js service orchestrating automated workflows on top of a Postgres data layer via Supabase.

Nest.jsSupabasePostgres