bartek@out.cam:~$ whoami

out.cam

by Bartłomiej Krok - ▊

A one-person software studio. I design and build fast, reliable products for web and mobile - React, React Native and the tooling around them, from first commit to production.

get in touchwhat I doopen to new projects

01.about

out.cam is the software studio of Bartłomiej Krok - a one-person company, which means every line of code is written by the person you talk to. No handoffs, no middlemen.

I'm a software engineer and solution architect based in Warsaw, Poland. I partner with Callstack - one of the leading React & React Native consultancies - building and shipping apps used by millions of people.

I care deeply about performance, developer experience and code that stays readable a year later. From bundlers and build pipelines to release automation, I like to understand the whole path from commit to production.

Outside of work I spend time with my beloved family and support Liverpool FC. // YNWA

$ cat profile.json

{
  "name": "Bartłomiej Krok",
  "company": "out.cam",
  "location": "Warsaw, PL",
  "roles": [
    "Software Engineer",
    "Solution Architect"
  ],
  "languages": ["pl", "en"],
  "supports": "Liverpool FC"
}

02.services

01

Web Development

Modern, fast web applications built with React, Next.js and TypeScript. From MVPs to production systems serving real traffic - with performance and maintainability baked in.

  • React
  • Next.js
  • TypeScript

02

Mobile Development

Cross-platform mobile apps with React Native. One codebase, native feel on iOS and Android. Smooth animations, offline support and app store delivery included.

  • React Native
  • iOS
  • Android

03

Solution Architecture

System design, technical audits and architecture reviews. I help teams choose the right tools, untangle legacy code and set up foundations that scale with the product.

  • System Design
  • Audits
  • Scalability

04

Performance & Tooling

Bundle size, startup time, build pipelines. I work on developer tooling and performance optimization - including bundlers and CI/CD - so your app and your team ship faster.

  • Bundlers
  • CI/CD
  • Optimization

03.stack

./languages

  • TypeScript / JavaScript
  • Swift / Objective-C
  • Kotlin / Java
  • C# (Unity)

./web

  • React
  • Next.js
  • Performance profiling
  • Web security
  • Payments (web & mobile)

./mobile

  • React Native
  • Navigation & deep linking
  • Reanimated · Lottie · Gesture Handler
  • Accessibility

./delivery & quality

  • CI/CD - Azure DevOps
  • Testing - e2e · unit · integration
  • Observability - RUM · error tracking
  • Performance audits

$ ls ./also-on-the-radar

  • Node.js
  • GraphQL
  • Re.Pack
  • Rock.js
  • webpack / Rspack / Turbopack
  • Expo
  • AWS
  • Docker
  • Unity
  • Rust
  • Go
  • WebAssembly
  • AI agents
  • Brownfield
  • TV & desktop

04.apps

Things I build after hours - small, useful and free to try.

$ open tree.out.cam

Family Tree↗

// your family history, one click at a time

A friendly family tree builder that runs entirely in your browser. Add people, link generations, pan and zoom through your ancestors - no account needed, your data stays with you. Simple enough for grandma, nerdy enough for you.

  • Vanilla JS
  • Privacy-first
  • Senior-friendly

$ open timeline.out.cam

Timeline↗

// your whole life, on one axis

A personal lifelogging timeline - private by design, local-first. Your memories live in your own cloud, not on someone else's server. One Expo codebase for iOS, Android and web. Coming soon - the axis is already ticking.

  • React Native
  • Expo
  • Local-first

$ open baby.out.cam

Baby Name↗

// swipe right on your kid's name

A playful PWA for picking a baby name. Swipe through names Tinder-style, curate your shortlists, then let a head-to-head tournament crown the winner - confetti included. Works offline, saves locally, installs like an app.

  • React
  • PWA
  • Offline

$ open flow.out.cam

Flow↗

// think in shapes, not slides

Mind maps and diagrams on an infinite, hand-drawn canvas - a free, local-first Miro alternative. Unlimited sketches autosaved in your browser, undo/redo, keyboard shortcuts, export to PNG, SVG or PDF. No account, no server, no limits.

  • Next.js
  • Canvas 2D
  • Local-first

05.contact

$ ./say-hello.sh

Have a project in mind?

Whether you need a new app, an architecture review or an extra pair of experienced hands - let's talk. I usually reply within a day.

send an emailLinkedIn ↗