KJ Labs Studio

↳ Mobile & web development studio — Warsaw, PL

WEBUILDPRODUCTSTHATWORK

Mobile & web apps for startups and companies that refuse to be average.

See our workLet's talk
3+ YEARS EXPERIENCE12+ PROJECTS SHIPPED100% CUSTOM CODE

Projects

What we've built

2026Web & Mobile

Skinvestments

Web and mobile app for tracking skincare routines and product spend — React + Vite 19 on web, native mobile, Supabase backend.

  • React
  • Vite 19
  • Flutter
  • Supabase
Visit app View case study
01 / 05

Services

What we do

About

Two people. One approach.

We are KJ Labs Studio — a small studio with a big approach to code and design. We treat every project as our own product. No bureaucracy, full commitment.

  • K

    Kacper

    Co-founder & Mobile Dev

    iOS and Android — Flutter, React Native, and shipping apps that feel native on every device.

  • J

    Jan

    Co-founder & Full Stack

    Full-stack development and security — from APIs and infra to hardening what goes to production.

Process

How we work

  1. 01

    Step 01

    Discovery

    & Scope

    We map goals, users, and constraints. Clear scope, realistic timeline, and no surprises later.

  2. 02

    Step 02

    Design

    Prototype

    Wireframes and interactive prototypes. You see the product before a line of production code.

  3. 03

    Step 03

    Develop

    & Test

    Iterative builds with weekly demos. Automated tests, code review, and performance baked in.

  4. 04

    Step 04

    Launch

    & Support

    Deploy, monitor, and hand over docs. We stay available for fixes, updates, and the next version.

Tools we trust

React NativeFlutterNext.jsReactNode.jsTypeScriptReact NativeFlutterNext.jsReactNode.jsTypeScript
FigmaFirebasePostgreSQLSupabaseExpoVercelFigmaFirebasePostgreSQLSupabaseExpoVercel

Got an idea?

Let's turn it into a product.

Let's talk kjlabs.studio@gmail.com