Yves Heitkamp · Independent software development

Data engineering, journey planning and public transport software.

I build software and data systems at the intersection of public transport, multimodal routing and data quality. My projects cover GTFS preprocessing, cross-feed data fusion, routing, Android development, APIs and visual tools for understanding complex transit data.

Based in Dortmund, Germany · open to remote, hybrid and relocation opportunities

Try the IXIT app demo Explore the Keetson demo

Working projects

Software systems built to be inspected and tested.

Functioning Android applicationIXIT

Multimodal journey planning with a commuter timeline and wake-up-time derivation.

IXIT combines GTFS preprocessing, data modelling, routing, walking and transfer relationships, and an Android user interface into an understandable commuter plan.

Sole design and development: Yves Heitkamp.

Explore IXIT

Public synthetic demoKeetson

GTFS data analysis and visualisation for transparent review workflows.

Keetson makes stops, lines, operators, timetables and deviations visible. Its public demo uses only a purpose-built synthetic GTFS dataset.

Sole design and development: Yves Heitkamp.

Try the public Keetson demo

Technical practice

Data systems, applications and practical infrastructure.

Java, Kotlin, JavaScript, PHP, HTML/CSS, SQL, SQLite, MySQL/MariaDB, GTFS and GTFS-Realtime, REST/JSON, Git, Gradle, Android Studio, IntelliJ IDEA, SSH and cURL.

Current work also includes data validation, normalisation, feed fusion, data modelling, data visualisation, routing and search logic, unit tests, and Linux and Docker in practical use and ongoing development.

Additional project

LineManager - Public transport strategy game.

Network design and operations

An Android strategy game about designing and operating public transport networks.

Implementation

Canvas-based map, line and vehicle logic, passenger routing, transfers, local persistence, unit tests and secure offline map updates.

Technologies

Kotlin, Jetpack Compose, Canvas, DataStore, JSON, HTTPS and unit tests.

Status: active development.

Contact

Interested in the projects or a professional conversation?

I would be glad to hear from you. I am open to opportunities in data engineering, journey planning and data-driven software development.

Get in touch