Lead Backend Software Engineer

9/2021 – 3/2023

I was helping the E-commerce part of Springer Nature to improve the Checkout Process as well as improve engineering practices within the team (6 engineers).

My top achievements:
* Improved architecture of the backend services (Scala) supporting the E-commerce Checkout process.
* Built a reporting data pipeline using GCP Pub/Sub + BigQuery.
Improved team culture around architecture decisions and documentation.
* Rebuilt backend services monitoring and alerting system and proposed a better way of handling incidents.
* Improved team productivity by introducing multiple automations including:
* Automated CI/CD quality checks using GitHub Workflows.
* Automated application dependencies updates and security checks.
* Fully automated deployments with acceptance tests.

Tech stack: Scala, JS, GCP (BigQuery, Pub/Sub), DevOps, CloudFoundry, Concourse, GitHub Workflows, Grafana, Loki, Prometheus, Postgres, Google Analytics

PostgreSQL, DevOps (allg.), Agile Entwicklung, Application Development, Docker, Git, Java (allg.), Scala, Cloud (allg.), Cloud Computing, Google Cloud, Google Analytics, Google Tag Manager, JavaScript

5/2016 – 8/2021

My main focus points in Zalando were: Operational excellence, Site Reliability Engineering, Coaching team on best engineering practices.

My featured projects:
* Implementing Zalando Feature Toggling system: integration with all customer facing services and applications, monitoring systems, feature toggling management system.
* Migrating to Kubernetes Backend services under high load (around 100K requests per second)
* Setting up Kubernetes CI/CD pipeline with green-blue deployment of higly loaded backend service (around 100K requests per second).
* Zalando Experimentation platform improvements: migration to Kubernetes, improving observability, low latency reliable backend, integration with OpenTracing platform, Black Friday preparations and 24/7 responsibilities, setting up machine learning data pipelines for faster experimentation.
* Zalando Retail portal. Allowing other Retail teams to integrate their supplier facing applications into a single platform with common user interface and out of the box authorization and authentication solutions.
* Zalando Retail Authorization and Authentication platform: authorization and authentication solution for Zalando employees and Zalando suppliers under one premise

Tech stack: Scala, Java, JS, ReactJS, AWS (EC2, S3, Route53, CloudFormation), DevOps, Kubernetes, GitHub, Grafana, Scalyr, Prometheus, Postgres.

PostgreSQL, DevOps, Docker, Git, Java (allg.), Java-Frameworks, Scala, Spring, Cloud (allg.), Amazon Web Services (AWS), JavaScript, Kubernetes, React (JavaScript library)

3/2015 – 2/2016

My responsibilities were:
* design and develop interactive voice applications for contact center solutions (Genesys Contact Center Solutions)
* implementing customizations for business needs of contact centers
* designing and developing new responsive web user interfaces
* refactoring legacy software

I completed a Genesys SDK 8.1 Developers Workshop course in Genesys University

PostgreSQL, Application Development, Git, Java (allg.), Java-Frameworks, AngularJS