Raphael Kalinowski

Full Stack Developer

I’m a full-stack developer working across web applications, content systems, software architecture, and CI/CD. At Handelsblatt, I contribute to CMS modernization, API development, and technical decisions.

I value clear priorities, efficient decision-making, and collaboration across technical and business teams. I help improve workflows so teams can work more effectively.

How I work Experience Contact

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How I work

Focus areas

Full-stack Focus

Several years of experience in front-end and back-end web development

CI/CD

Setting up pipelines with test automation steps (VRTs, smoke tests with Bruno/Postman, E2E tests with Playwright)

Architecture

Designing microservice architecture in domain-driven design, comparing monoliths and microservices depending on the ecosystem

Agile Frameworks

Supporting the team in workflow optimization and transition to an agile framework (Scrum, Kanban, SAFe)

Agentic engineering

I work with skills, MCP, hooks, and written guidelines across Claude, ChatGPT, and custom local models. Context and constraints matter. So does reviewing the result: generated code still has to survive a code review.

Technologies

Languages, frameworks, and infrastructure I work with. The choice depends on what needs building and who will maintain it. Highlighted tools are the ones I also use for personal projects.

Languages & foundations

TypeScript — Also used for personal projects
Go — Also used for personal projects
HTML / CSS
Sass
C# / ASPX
Python
Rust
Java
Kotlin

Web & desktop

Angular
React
Svelte — Also used for personal projects
Next.js
Node.js
Koa
Wails — Also used for personal projects

Data & content

Redis
MongoDB
Livingdocs
Contentstack
Headless CMS — Also used for personal projects

Testing & delivery

Playwright
Bruno — Also used for personal projects
Postman
GitHub Actions
Azure DevOps
Docker — Also used for personal projects
Kubernetes

Platforms & tooling

Grafana
Cloudflare
GitHub Copilot
Jira
Confluence

Experience

Roles, projects, and responsibilities.

Nov 2024 — Present
Handelsblatt GmbH · Full-time
Backend Developer
Iterative migration from a legacy CMS to Livingdocs, consumer-driven APIs defined with OpenAPI, and editorial features in a headless CMS. Involved in architectural questions and technical decisions.
May 2024 — Nov 2024
Handelsblatt GmbH · Full-time
Frontend Developer
Maintained handelsblatt.com and wiwo.de with Angular. Worked on infrastructure in Azure DevOps and backend-for-frontend mapping with Node.js and Koa.
Feb 2023 — May 2024
I-D Media AG · Part-time
Frontend Web Developer
Worked on sky.de in an international, agile team using React, Next.js, and Contentstack.
Sep 2019 — Feb 2023
I-D Media AG · Full-time apprenticeship
Apprentice Software Developer
Apprenticeship as a Fachinformatiker für Anwendungsentwicklung. Maintained sky.de with AngularJS, jQuery, and OpenText CMS, alongside Python development at vocational school.

Education

Sep 2017 — Sep 2019

Media Technology studies

TH Köln, Deutz

Studies not completed. First experience with Java and object-oriented programming.

Further learning

Jul 2025

WeAreDevelopers World Congress

Berlin

Explored generative AI and developments in JavaScript, CSS, and Java.

Earlier internships

Mar 2019 — May 2019

Media Technology internship

Graner + Partner GmbH

Created 3D models with SketchUp and EASE.

Nov 2014

Business internship

J.P. Sauer & Sohn Maschinenbau GmbH

Business internship at Sauer Compressors.

Apr 2013

Internship

PRISMA Computertechnik e.K.

Early work experience.

Contact

For a project, a technical question, or a conversation about the work.

Contact details not added yet.