Bastian Koetsier

Bastian Koetsier

Software Engineer

Hi, I am Bastian Koetsier, a Software Engineer from Berlin. With my passion for technology and learning new stuff, I always try to push projects forward and to think outside the box focussing on the bigger picture.

When I am not working, I am a passionate gamer, football enthusiast and father of two sons.

Work Experiences

Senior Fullstack Developer

2019- Present

Lendis GmbH

  • Bootstrapping the technical infrastructure
  • Application Interviews
  • Mentorship & Pair-Programming
  • Single-Page-Apps using React.js and Gatsby.js
  • Backend-API with Laravel (PHP)
  • Designing using Tailwind CSS
  • Serverless Google Cloud Functions written in Node.js
  • Static Website Hosting using Firebase
  • Backend Hosting using Google Cloud Platform (AppEngine)
  • Continuous Integration with Github Actions

Fullstack Developer

2015 - Present

Self-Employed (part time)

  • Building REST-APIs based on Laravel (PHP) and Go(lang)
  • Continuous Integration/Deployment
  • Test-Driven-Development
  • Single-Page-Apps with Vue.js
  • Tailwind CSS, Bootstrap
  • Webpack Module-Bundling
  • Kubernetes Deployment
Berlin / Remote

Backend Chapter-Lead / Backend Developer (Go)


Hellofresh SE AG

  • Mentorship & Pair-Programming
  • Architectual Advisor / Reviewer
  • Individual Contributor for Go(lang) based Microservices
  • Driving Best-Practices
  • Migration from Monoliths to Microservices in Go(lang)
  • CI/CD using Concourse
  • Infrastructure as Code with Terraform
  • Consul Service Discovery
  • Amazon Web Services (AWS)
  • RabbitMQ Queueing System
Berlin / Remote

Software Engineer (PHP)

2014 - 2016

bytepark GmbH

  • Client projects based on symfony2, Zend Framework 2 and Laravel 4/5
  • Quality assurance with PHPUnit, phpmd, phpcpd
  • Continuous Integration with jenkins CI server
  • Development environments based on docker and vagrant
  • Ansible provisioning

Senior Technical & SEO Consultant

2013 - 2014


  • SEO-Consulting for Clients (On-Site-Optimization)
  • Software development for internal tools based on Laravel 4

PHP Developer

2011 - 2013

Media Blue GmbH

  • Building Web Applications in „Vanilla“ PHP
  • Developing Wordpress Plugins and Themes
  • Further Development of the Online Shop based on osCommerce
Neuenkirchen, NRW

Professional Skills


Expert, 8 years
I have been using PHP for my whole career: being it Wordpress-based homepages or more complex Web Applications based on symfony2 or Laravel. I gained a lot of experience designing, building and maintaining/refactoring applications in different phases of their lifecycle. Especially with the release of the latest major version PHP 7 and its dramatically increased performance, PHP is a valid choice for building web applications.


Advanced, 5 years
Being a relatively young language Go(lang), is my tool of choice for high performance REST-/RPC-based APIs or applications that require high concurrent processing. With its ease of maintainability through its strongly typed nature and amazing tooling, Go(lang) has the foundation to also build CLI applications or even server daemons.


Advanced, 5 years
Most of my frontend work for clients is done using Vue.js. These frameworks provide a skeleton for highly performant Single-Page-Applications with realtime interaction by speaking to REST-APIs in the backend.
Kubernetes MySQL Terraform Consul Ansible Git

Get in Touch

I'm currently taking on freelance work.

I can help with the following:

  • Back-end development with PHP(Laravel) or Go(lang)
  • Designing the application architecture
  • Improving performance of web apps
  • Increase application stability through automated testing

Drop me a line at
Email: Please click