sebastian fudalej

Sebastian Fudalej

Backend and AI engineer in Wrocław, building payment integrations, developer tools and practical AI workflows.

A brown tabby Maine Coon sitting upright, tail curled around its paws

I build payment integrations and backend systems at MasterBorn.

Node.js, TypeScript and AWS, mostly.

DevOps came first, so I care what happens after the commit.

At home, a lab of servers and smart devices keeps me experimenting.

Software that keeps running.

  1. July 2025 to now

    Backend and AI engineer at MasterBorn

    I share the payments API of an accounting and tax platform and lead the integration with a new card and ACH provider, working with the vendor directly. Shipped partial payments, legacy service changes and webhook latency diagnostics.

  2. September 2024 to July 2025

    DevOps and SecOps engineer at Zebra Technologies

    CI pipelines for Linux images that run on custom hardware, and the machines that train computer vision models. GitHub Actions, Docker Swarm, GCP, Azure and Ansible.

  3. May to November 2024

    DevOps intern at Grid Dynamics

    A structured DevOps learning path, start to finish.

  4. December 2023 to May 2024

    DevOps engineer at SlickCloud

    Fixed CI/CD and environment problems across Kubernetes, Jenkins, Docker and Red Hat Enterprise Linux.

  5. May 2022 to March 2023, part-time

    Backend engineer at Clavo

    A Slack integration for timesheet changes and who is available, plus features and fixes on Express, Parse Server and MongoDB.

AI, with a person at every gate.

As an AI engineer at MasterBorn, I build reusable agent plugins and workflows, document engineering practices and share them with the team.

The tabby cat lying down, studying a small tin toy robot

Autodev

A Claude Code workflow I designed and built. It takes a feature from requirements to a pull request, and waits for a person to approve each step.

  1. Requirements
  2. Jira plan
  3. Implementation
  4. Pull request

Code review that checks itself

AI-assisted review where every finding is verified independently before anyone reads it.

Yggdrasil

A home lab across three locations, joined by VPN. Virtual machines, containers and automated builds, run like production.

Proxmox, Kubernetes, Ansible, Docker, WireGuard, OPNsense, Grafana and Jenkins.

A bonsai tree grown from ethernet cables, rooted in a small server rack

Side projects.

Built at home, mostly with Codex and Claude Code, and tested on the real hardware.

  • A small pocket device with an amber button and a screen showing a sound wave

    Voicestick

    Hold a button, speak, let go. The note becomes a calendar event, a task for an agent or, when nothing fits, a plain note.

    ESP32, Cloudflare Workers, TypeSafe Jev

    voicestick.sbfd.me
  • A walking pad treadmill with a smartwatch on its belt

    Daystride

    A dashboard for a connected treadmill and an Apple Watch, with workout history and activity analysis.

    Cloudflare Workers, D1, Codex

  • A rangefinder film camera with a small tortoiseshell butterfly on top

    Aglais

    Studio management for photographers, built by AI agents with set roles, task tracking and reviews.

    Next.js, Drizzle, Neon PostgreSQL

  • A compact mechanical keyboard with one amber key

    Agent environment

    Task-aware terminal titles, an fzf session picker, a local session viewer, and skills and hooks that carry context between sessions.

    Claude Code, plugins, hooks

  • A model race car parked on a vinyl record

    Dynamic Music

    Remixes music stems live from Forza driving telemetry, with replay for repeatable tuning.

    TypeScript, Electron, Web Audio, Python

  • A glowing coil of LED strip wired to a small board

    lydlys

    A music festival at home. Lights that react to music, with WLED and controls in the browser.

    Go, TypeScript, WLED

    Source on GitHub
  • A smart bulb, a wireless button and a temperature sensor

    Smart home

    Lighting, climate, security and energy monitoring, all run by Home Assistant.

    Home Assistant, Zigbee, ESPHome

  • The tabby cat sitting in a cardboard box

    This site

    Plain HTML, CSS and TypeScript, built with Vite. Starring my cat.

    TypeScript, Vite

    Source on GitHub

What I work with.

Backend

  • Node.js
  • TypeScript
  • Fastify
  • Express
  • PostgreSQL
  • Redis
  • REST APIs

AI and developer tools

  • Codex
  • Claude Code
  • Agent workflows
  • Skills, plugins and hooks
  • AI-assisted review

Cloud and delivery

  • AWS Lambda, API Gateway, SQS, SNS, EventBridge
  • Docker
  • GitHub Actions
  • Kubernetes
  • Ansible
  • GCP
  • Jenkins

Infrastructure

  • Linux
  • Proxmox
  • WireGuard
  • Nginx
  • Grafana
  • Home Assistant

Hackathons

A small silver trophy

  • May 2026

    AI research CRM

    Second of seven teams, and the Best Design award. Four of us built a contact graph and conference briefings with agentic RAG over ChromaDB through MCP tools, on Claude and the Vercel AI SDK.

  • Internal AI hackathon

    Group trip assistant

    Second place. Three of us built an assistant that follows a group chat and helps plan a shared trip, on Gemini Flash.

Education

A graduation cap resting on two closed books

  • 2024 to 2026

    Master's in Computer Science, Cybersecurity

    WSB Merito University in Wrocław. Compared LLMs with static analysis for finding Node.js vulnerabilities, with SecOrchestrator running evaluations on CVEFixes and OWASP Juice Shop.

  • 2020 to 2024

    Engineer's degree in Computer Engineering

    Opole University of Technology. Designed a DevOps pipeline on GCP with Terraform, Kubernetes and Docker.

Talk backend, tooling or AI.

LinkedIn is the quickest way to reach me.

Message me on LinkedIn
The tabby cat asleep, curled into a ball