Gunnar Hollander

Lead Software Engineer

contact@hollander.one • Zürich, Switzerland

Lead Software Engineer with over a decade of experience in architecting scalable microservices, leading development teams, and ensuring software quality in the Swiss banking and healthcare sectors.

Experience

From Jan 2024 until Present

Lead Software Engineer at Sanitas Krankenversicherung

Zürich

From Oct 2022 until Dec 2023

Lead / Senior Software Engineer at CLEO AG / nu.education

Zürich

  • Modelling of data structure and business processes
  • Feature planning in cooperation with product owners
  • Product responsibility
  • Design, implementation and architecture of microservices with Spring Boot, Go and GraphQL
  • Refactoring and performance optimization of existing microservices
  • Contact person for backend-topics
  • Reworking of authentication and authorization with Keycloak via Spring Security
  • Onboarding and coaching of new developers
  • Ensuring clean code principles
  • Incident management
  • Setting up and configuring Kubernetes clusters in Jelastic
From Apr 2021 until Sep 2022

Senior Software Engineer at Health Info Net (HIN) AG / AD Swiss Net AG

Wallisellen

  • Developing COVID vaccination reporting and COVID certificate service “AD Swiss Covid Impfen”
  • Technical contact person for 3rd party systems
  • Product and server-responsibility
  • Supporting requirements engineer and project lead with application planning and risk assessments
  • Integration of SAML and OAuth authentication
  • Supporting and onboarding external developers
  • 3rd level support
From Sep 2019 until Mar 2021

Software Engineer at Health Info Net (HIN) AG / AD Swiss Net AG

Wallisellen

From Apr 2017 until Aug 2019

Software Engineer at ETH Zürich

Zürich

From Apr 2015 until Mar 2017

Quality Assurance Associate at SapientNitro

Zürich

From Oct 2013 until Mar 2015

Junior Software Engineer at UBS AG

Zürich

From Aug 2012 until Sep 2013

Internship Software Engineer at UBS AG

Zürich

Technologies

Programming Languages

Java SQL HTML5 CSS XML JSON JavaScript PHP Go GraphQL

Frameworks & Architectures

Spring Boot Hibernate OpenSAML Bootstrap Swagger SOAP jQuery JUnit Astro TailwindCSS

Tools & Platforms

IntelliJ Git Google Cloud Docker Kubernetes Apache Tomcat Ubuntu Server MariaDB MySQL Keycloak

AI & Coding Assistants

Cline Roo Code Kilo Code Antigravity

Education

Kantonsschule Enge, Zürich

Fähigkeitszeugnis (Federal VET Diploma), Informatiker EFZ

From 2012 until 2013

Kantonsschule Enge, Zürich

Berufsmatura (Federal Vocational Baccalaureate), Kaufmännisch

From 2009 until 2012