// available for new projects · Q3 2026

<Sebastian Dawidziak/>
I build apps and infrastructure

Tweet Geek is a one-person studio. Web, mobile, devops — from the first git init all the way to production on Kubernetes. No useless meetings, no middlemen, no npm install left-pad.

01 //

~/services

web.dev

Web apps

Full cycle: from idea to prototype to production. SaaS, dashboards, APIs, integrations.

  • React · Next.js · TypeScript
  • Node · Python · PostgreSQL
  • Stripe · OAuth · WebSockets
mobile.app

Mobile apps

Native and cross-platform. From MVP on the App Store and Google Play, to updates and new versions.

  • Swift · Kotlin
  • React Native · Expo
  • Push, IAP, deeplinks
devops.sh

DevOps & hosting

I set up, maintain and optimize servers. Kubernetes, GCP, Hetzner, Coolify — no vendor lock-in.

  • Kubernetes · Docker · Helm
  • CI/CD · GitHub Actions
  • Monitoring · Backups · SLA
02 //

~/stack

Kubernetes orchestration
G
GCP cloud platform
H
Hetzner bare metal & cloud
C
Coolify self-hosted PaaS
React / Next frontend
N
Node.js backend
S
Swift iOS native
K
Kotlin android native
PostgreSQL database
D
Docker containers
T
Terraform IaC
$
Bash / Zsh automation
03 //

~/about

Hi — I'm Sebastian. I've been writing software for over a decade, but Tweet Geek is my way of doing it on my terms: small teams (read: me), fast iteration, code that isn't afraid of code review.

I'm at my best where product, code and infrastructure overlap — designing a feature, shipping it in React Native, then rolling it out on a K8s cluster at 3 AM.

I run as a solo business — no PM layer, no useless meetings, clear estimates and zero enterprise bullshit.

// lines of code since 2014 ~∞
// projects in production 30+
// uptime SLA 99.9%
// coffees / day 3 ☕
// location Poland 🇵🇱
05 //

~/contact

Got a project? curl me.

A few lines about the idea, deadlines and budget — I usually reply within 24h. Email is fastest; LinkedIn works too.