C. Zeltner
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    Software Design & Engineering
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Abstract software development background

W e l c o m e !

I  work  as  a  fullstack  softwaredeveloper  from  Berlin  (freelance)

Services

I’m a Full-Stack Developer focused on the future of software creation: agentic workflows. By integrating tools like Claude Code, Cursor, GitHub Copilot, I drive maximum productivity while maintaining a relentless focus on code integrity.

I believe that AI-driven development only works when backed by deep architectural understanding. I bridge the gap between rapid AI generation and sustainable engineering, ensuring your systems remain clean, secure, and scalable. With a degree in software engineering and decades of hands-on experience, I deliver high-speed results without the technical debt.

Technologies used by me recently

Frontend

TypeScript, React, Redux, REST, GraphQL, CSS-in-JS, SCSS (Sass), BEM, yarn, npm

Little experience with Vue and Svelte so far, but more with pleasure.

Backend

Java, Kotlin, Spring, TypeScript, Node.js, Python, Gradle, Maven, npm, yarn, relational DBs, NoSql, Elastic Search, REST, GraphQL, Pytorch, fastai, PHP, Wordpress, Shopify, headless CMS

Dev Inf

Git, Github, Eclipse, Intellj, Visual Studio Code, Copilot, Cursor, Linux...

Dev Ops

Linux, Jenkins, Team City, Github, Docker, Kubernetes, Helm, Terraform, various logging and monitoring tools (e.g. Datadog), AWS (e.g. Api Gateway, Lambda, Fargate, ALB, ECS, ECR)

Portfolio

As a freelancer on site e.g.:

  • Delivery Hero SE
  • IBM iX - Aperto GmbH
  • Zalando SE
  • Zwiepack GmbH
  • Smarthost GmbH
  • Flightright.de

Latest personal projects

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Lottowatch

Lottowatch

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Deep Learning

Miscellaneous applications from the area of Deep Learning

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Rental price stop

Application to check the German rental price stop law

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Deep Learning

Predicting the probability of winning an online poker hand

Map

Contact

Please get in touch with me!