Rostyslav Tulika
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Software development · Herbstein, Germany

Rostyslav Tulika

Software developer and founder

I build software across the whole stack: Angular interfaces, NestJS APIs and the Kubernetes infrastructure they run on.

Rostyslav Tulika at his desk in front of a monitor showing code

01 Profile

I like working where the interface meets the system: a component that feels right, an API that validates properly, and the cluster that ships both reliably.

Since 2024 I have been doing a shortened apprenticeship as an IT specialist for application development (Fachinformatiker Anwendungsentwicklung) at narz systems GmbH & Co. KG in Herbstein. There I work on the IIoT platform audako, mostly with Angular, plus NestJS and .NET.

Alongside that I run Tail Forge Technologies: IT services and web development for small businesses in the Vogelsberg region. Under the same company I build Faktigo, software for e-invoicing. Both run on a Kubernetes cluster I built and operate myself.

Focus
Angular, TypeScript, NestJS
Operations
Kubernetes, Helm, Jenkins
Languages
German, Ukrainian, English
Based in
Herbstein, Hesse, Germany

02 Projects

Four layers, one stack. Each project shows which layers I worked on and with what.

  1. E-invoicing for small businesses

    Faktigo

    Founder · development and operations

    Faktigo is software for freelancers and small businesses in Germany: ZUGFeRD and XRechnung invoices, quotes, dunning and bank reconciliation in one place.

    Interface
    Angular 20, NgRx Signals, elementar-rt
    Service
    NestJS 11, Fastify, MongoDB, Redis
    Platform
    Helm, Jenkins, own registry
    Read the case study
  2. Open-source components for Angular

    elementar-rt

    Maintainer

    elementar-rt is an MIT-licensed UI library for Angular, built on Material Design 3 and Tailwind CSS 4. It comes with five templates that run as live demos.

    Interface
    Angular 21, Material 3, Tailwind CSS 4
    Platform
    Jenkins pipelines, live demos in the cluster
    Read the case study
  3. Kubernetes on my own hardware

    Homelab cluster

    Built and operated

    An RKE2 Kubernetes cluster on my own hardware that runs my products in production: Faktigo, tailforge.de, a mail server, the elementar-rt demos and this site.

    Platform
    RKE2, Rancher, Longhorn, Helm, Jenkins
    Network
    MikroTik, L2TP/IPsec, nginx ingress
    Read the case study
  4. IT services and web development in the Vogelsberg region

    Tail Forge Technologies

    Owner

    Tail Forge Technologies is my company: IT support, web development, networks, video surveillance, VoIP and Microsoft 365 for small businesses around Herbstein, Lauterbach and Fulda.

    Interface
    Angular 20
    Service
    Strapi 5 as a headless CMS
    Platform
    Runs in my own cluster
    Network
    Networks, video and VoIP on site
    Read the case study
  5. IIoT and process control at narz systems

    In the apprenticeship

    Work on the web interface of the IIoT platform audako and on Inframan, a device management solution. As a self-directed project: a configuration and diagnostics tool for Siemens SIMATIC IOT2050 gateways.

    Interface
    Angular, Signals, Material Design 3
    Service
    NestJS, REST, .NET
    Network
    Gateway networking, VPN, certificates
    See the background

03 Background

  1. since 2024

    Apprenticeship: IT specialist for application development

    narz systems GmbH & Co. KG, Herbstein

    Shortened apprenticeship (Fachinformatiker Anwendungsentwicklung), vocational school at Theodor-Litt-Schule Gießen. Work on the web interface of the IIoT platform audako (Angular, Material Design 3, Signals) and on Inframan. Self-directed project: a configuration and diagnostics tool for industrial gateways with Angular and NestJS.

  2. 06/2026

    CCNA: Introduction to Networks

    Cisco Networking Academy

    Next: CCNA Switching, Routing and Wireless Essentials.

  3. in parallel

    Tail Forge Technologies and Faktigo

    My own company

    IT services for small businesses, my own e-invoicing SaaS, and running it all on my own infrastructure.

Full background

04 Tools

Front end

  • Angular (Signals, NgRx Signals)
  • TypeScript
  • Angular Material, Material Design 3
  • RxJS
  • Tailwind CSS
  • SCSS
  • Vite
  • Astro

Back end

  • NestJS
  • Node.js
  • Fastify
  • Express
  • REST
  • MongoDB
  • PostgreSQL
  • Redis
  • Keycloak
  • Strapi
  • .NET, C#

Platform

  • Kubernetes (RKE2, Rancher)
  • Docker
  • Helm
  • Jenkins
  • Longhorn
  • cert-manager
  • nginx
  • Linux (Debian, Fedora)
  • Git, GitHub

Network and security

  • CCNA fundamentals
  • MikroTik
  • L2TP/IPsec
  • IT/OT security basics
  • Working in an ISO 27001 environment

Domain

  • E-invoicing (ZUGFeRD, XRechnung, EN 16931)
  • FinTS, SEPA
  • IIoT, HMI, SCADA
  • UI/UX, Figma

Languages

  • German (native)
  • Ukrainian (native)
  • English (B2)

Also worked with JavaScript, Python, Java, Dart, Flutter and Ionic.

Contact

Questions about a project, elementar-rt or the cluster? Email is fastest.

rostik.tulika@gmail.com

Project requests for Tail Forge Technologies go through tailforge.de.