Senior Fullstack Entwickler

10/2019 – 1/2021

• Main technologies: Scala, Cassandra, Hive, Kafka, Docker, Kubernetes
• Designed and implemented an in-house operational service to improve the developer experience of creating,
configuring and running data pipelines. This entailed:
– Creating, removing, configuring and scaling Kubernetes deployments based on developer-provided data
pipeline configuration
– Coordinating creation of data stores (Cassandra, MySQL, Postgres, Hive, HDFS) and creation of message queues
(Kafka, RabbitMQ) with creation of data processing solutions (e.g. Kafka Connect)
• Designed and implemented a high-availability analytics data pipeline solution using Kafka and Akka Streams (Scala).
This required:
– A modular, configurable design that enables creation of new pipelines without code changes
– Fault-tolerant enrichment of event data from several internal REST APIs as well as parallelized forwarding of
events to a slow third-party REST API, all while preserving event order
– Making data available for analysis in Hadoop / Hive
• Led an initiative to improve insight into deployed systems by consolidating metrics in Prometheus. This enabled the
creation of detailed dashboards and alerts as well as basic anomaly detection
• Migrated legacy virtual machine deployments to Kubernetes
• Started an open-source project to automate the creation of Grafana dashboards using TypeScript
• Participated in the on-call rotation and provided support to in-house developers having trouble with internal systems

Kafka, Docker, Scala, Kubernetes

1/2017 – 5/2019

• Main technologies: Java, Spring, C++, JavaScript, React, Go
• Built an IoT platform enabling safe deployment of applications written in Lua to heavy machinery operating in the
field, without requiring a firmware update, to allow our client to quickly deliver new functionality to its customers.
This involved:
– Over-the-air updateable C++ vehicle firmware capable of communication via CAN bus (real-time), GSM and WiFi
– A Java microservices backend capable of handling millions of connecting vehicles via HTTPS (mutual TLS)
– The CA structure, supported by Hashicorp Vault, for authentication and authorization of the vehicles and API
users
– The test framework that allowed us to emulate the vehicles’ CAN busses, for end-to-end testing of firmware and
backend
• Built a React-based, offline-first mobile CRM for one of the biggest wholesale companies on the globe. It is used by
thousands of employees across dozens of countries for their everyday operations on millions of customers. It
included:
– The Java Spring microservices based backend
– Fault-tolerant integration with several legacy systems built by remote teams
– Selenium-based browser testing, locally and in the cloud (BrowserStack)
• Facilitated numerous retrospectives, stand-ups and other meetings with a focus on actionable results
• Gained experience in enabling continuous integration and delivery, specifically using GoCD
• Monitored production applications using the ELK stack and Splunk
• Gained extensive Docker experience, both for production deployment and facilitating local development
• Deployed production applications to AWS (Terraform) and Google Cloud Platform

C++, Go (Programmiersprache), Java (allg.), JavaScript, Node.js, React (JavaScript library), TypeScript