Andreas Steffan - Lead Developer

Q: Where is Andreas based?

Andreas is based in Hamburg, Germany .

Q: What languages does Andreas speak?

Andreas speaks the following languages: German (Native), English (Advanced), French (Elementary) .

Q: How many years of experience does Andreas have?

Andreas has at least 24 years of experience. During this time, Andreas has worked in at least 18 different roles and for 14 different companies . The average length of individual experience is 1 year and 2 months . Note that Andreas may not have shared all experience and actually has more experience.

Q: What is Andreas's latest experience?

Andreas's most recent position is Lead Developer at Software .

Q: What companies has Andreas worked for in recent years?

In recent years, Andreas has worked for Software , Public Sector , Insurance , Food , and Warehouse Technology .

Q: Which industries is Andreas most experienced in?

Andreas is most experienced in industries like Manufacturing , Information Technology , and Banking and Finance . Andreas also has some experience in Media and Entertainment , Retail , and Insurance .

Q: Which business areas is Andreas most experienced in?

Andreas is most experienced in business areas like Information Technology , Product Development , and Marketing . Andreas also has some experience in Project Management , Operations , and Quality Assurance .

Q: Which industries has Andreas worked in recently?

Andreas has recently worked in industries like Information Technology , Insurance , and Retail .

Q: Which business areas has Andreas worked in recently?

Andreas has recently worked in business areas like Information Technology , Quality Assurance , and Operations .

Recommended expert

Hamburg, Germany

Experience

Sep 2023 - Mar 2024

7 months

Hamburg, Germany

Lead Developer

Software

Extended the document management system with a standard CMIS (Content Management Interoperability Services) interface
Implemented CMIS core services like navigation, access rights, search, CRUD operations, and versioning in Java
Implemented based on RESTful / OpenAPI services
Delivered as a fat-jar and native container image
Deployed on-premises and serverlessly as an Azure Container Application using Terraform
Improved team autonomy through infrastructure engineering and short feedback loops
Established observability with OpenTelemetry, Azure Monitor, and Azure Logic Apps
Introduced Terraform and trunk-based development processes
Ensured quality with BDD tests in C# using SpecFlow and Testcontainers
Created Azure DevOps pipeline integration tests
Introduced cloud deployment processes
Trained staff in cloud and Terraform

Mar 2023 - Apr 2023

2 months

Hamburg, Germany

Lead Developer Chaos

Public Sector

Built a chaos engineering environment with LitmusChaos
Implemented observability with the Prometheus stack
Implemented chaos workflows with Argo Workflows for two applications to build a fundamental understanding of chaos engineering
Simulated disruptions such as latency and service outages
Ultimate goal: improve application resilience

Nov 2022 - Sep 2023

11 months

Hamburg, Germany

Lead Developer/Architect

Insurance

Designed on-premises OpenShift (OKD) Kubernetes cluster environments
Declarative provisioning on vSphere using Terraform, ArgoCD, and Nix
Security-driven isolation of environments (sandbox, dev, int) with a subnet per cluster
Integrated ArgoCD with Terraform, using one ArgoCD instance per cluster
Provisioned the Terraform execution environment via Nix
Established observability with Datadog and the Prometheus stack
Provided image registry via AWS ECR
Trained team members

Sep 2022 - Oct 2022

2 months

Hamburg, Germany

Lead Developer Continuous Delivery

Food

Designed and implemented GitOps deployment processes for AWS EKS (Kubernetes)-based microservices using Flux and Terraform
Integrated Kubernetes with AWS IAM
Implemented continuous integration pipelines using GitHub Actions
Integrated Flux with Terraform
Handled inter-service communication primarily asynchronously via AWS SNS and AWS SQS
Connected third-party shop catalog eventing via AWS EventBridge
Implemented observability with Datadog
Integrated Slack for alerting and deployment events
Implemented service mesh with Traefik Enterprise

Apr 2022 - Jul 2022

4 months

Hamburg, Germany

Lead Developer Cloud Infrastructure

Warehouse Technology

Designed and implemented GCP infrastructure as part of a multi-cloud strategy
Designed and implemented landing zones
Implemented deployments with Azure DevOps and Terraform
Implemented alerting via MS Teams using ClojureScript
Developed serverless tagging using Go
Trained staff in Terraform

Jun 2021 - Apr 2022

11 months

Hamburg, Germany

Lead Developer Cloud/Continuous Delivery

Retail

Design and implementation of a GitOps change process for Kubernetes and GCP resources
Improving team autonomy through infrastructure engineering
Implementing GitOps for Solr resources with Clojure/ClojureScript
Implementing index feedback using machine learning
Continuous integration with GitHub Actions
Operating Solr via operator
Deployment across three stages
Implementing k6 load tests for Black Friday and the Super Bowl
Alerting via OpsGenie, Google Operations, and MS Teams
Integrating Prometheus with Google Operations Metrics
Implementing fast recovery (criticality) via rebuild/restore/reindex
Implementing search read cache with GCP Redis
Implementing canary migration with Apigee
Training staff on Terraform, Kubernetes, and operations

Mar 2021 - Jun 2021

4 months

Hamburg, Germany

Lead Developer Continuous Delivery Kubernetes ETL

Finance

Deployment on Google Kubernetes Engine (GKE)
Design and implementation of continuous delivery for Apache Airflow/Spark workloads
Implementing continuous delivery first with Helmfile, then with Flux
Implementing CI with GitHub Actions

Jan 2020 - Feb 2021

1 year 2 months

Hamburg, Germany

Platform Engineer

Logistics

Building a platform team to support feature teams
Improving application lead times
Deploying and operating various Kubernetes clusters: OpenShift PaaS, Kubespray + Ansible, and Telekom CCE
Covering the disciplines of observability, authentication/authorization (SSO), networking, key management, storage, databases, CI/CD, and messaging
Greenfield build of GCP infrastructure with Terraform, Cloud Build, and GitLab
Recovering from a major datacenter incident over Pentecost in shifts with a war room

Jul 2019 - Jan 2020

7 months

Hamburg, Germany

Developer/Infrastructure Architect

Mechanical Engineering

Planning and decommissioning of branch vSphere on-premises infrastructure and applications
Design and build of infrastructure and applications on AWS and Azure
Migration of services: file service, business applications, terminal servers, Exchange mail server, Netscaler ADC, and Veeam Backup
VPN migration
Setting up AWS IAM, EC2, Route 53, S3, Lambda, SES, CloudWatch, and AWS Backup
Integrating Azure Active Directory identity provider with MFA
Setting up Office 365 services

Jan 2018 - Jun 2019

1 year 6 months

Hamburg, Germany

Lead Developer Kubernetes Infrastructure

Finance

Design and implementation of a highly available and scalable platform for the consumer document archive on-premises with Kubernetes
Evaluating numerous cloud-native solutions in a short time
Setting up a CI/CD process based on GitOps principles
Selection and configuration of storage, networking, and observability

Sep 2017 - Feb 2018

6 months

Hamburg, Germany

Lead Developer Document Management Platform

Finance

Design and implementation of a headless consumer document archive for several million users based on the Alfresco Content Services platform and OpenAPI
Implementation of functionality for lifecycle, users, metadata extraction, search, transformations, and access control

Aug 2014 - Oct 2014

3 months

Hamburg, Germany

Lead Developer Content Management

Education

Design and implementation of a personal document management system (exams, applications, certificates) for students and lecturers in a university online campus
Implementation of student lifecycle, document capture, search for editorial team, student view, and authentication
Integration into the website
Setup of Linux server infrastructure

May 2013 - Aug 2013

4 months

Hamburg, Germany

Developer Content Management

Pharma

Design and implementation of an invoice storage system based on Alfresco ECM and CMIS
Replication of content from ERP system
Implementation of search
Enrichment of PDF documents with metadata from the ERP system
Synchronization of user master data with Active Directory
Authentication via Active Directory

Feb 2013 - Apr 2014

1 year 3 months

Hamburg, Germany

Lead Developer Content Management

Technical Service

Design and implementation of a document management and workflow solution for technical testing and inspection services
Coordination of contractors and clients through a general contractor for technical services
Import of service orders via REST API
Processing and monitoring of a process by contractors and clients
Processes for various document types like briefings and reports
Multitenant solution with proper access control

Jan 2012 - Dec 2017

6 years

Hamburg, Germany

Lead Developer Content Management

Entertainment

Design and implementation of a system to manage concert content (images, audio, video, documents) for various channels (websites, mobile)
Implementation of functionality for lifecycle, search, access control, delivery
Implementation of REST services (for UI and online shop)
On-premises setup of Linux-based server infrastructure

Jan 2012 - Dec 2013

2 years

Hamburg, Germany

Grails Application Developer

Mail Order

Implemented co-orderer shopping cart application using the Grails framework and Groovy
Features for group buyers, co-orderers, and employees
Communicated with surrounding shop systems via REST and SOAP interfaces
Implemented lifecycle management for carts and items, co-orderer master data, and cart merging
Implemented access control, fraud detection, and email sending

Nov 2011 - Oct 2012

1 year

Hamburg, Germany

Lead Developer Content Management

Insurance

Designed and implemented a content management system for an online help portal for insurance agencies using Alfresco ECM
Provided HTML-based content to around 2,500 agencies through a dedicated Java desktop application over VPN
Implemented lifecycle functionality, in-context editing, content aggregation, search functions, workflow management, and publishing

Jan 2006 - Jan 2018

12 years 1 month

Hamburg, Germany

Lead Developer Java

Mechanical Engineering

Designed and implemented a multi-tenant quote workflow and marketing application
Integrated with an ERP system
Tracked quotes
Managed documents in Alfresco ECM
Integrated an automated pricing calculation system for binding quotes
Synchronized data with ERP systems
Set up Linux-based server infrastructure

Oct 2002 - Feb 2006

3 years 5 months

Hamburg, Germany

Lead Developer Infrastructure/Continuous Delivery

Finance

Rebuilt the website for an online bank/broker, including transaction, market data, member, and public sections
Deployed new Linux servers and network infrastructure
Implemented single sign-on for the public area
Developed components for community, search, member data, form center, and content management
Managed communication between components using RPC/SOAP web services
Led the design and rollout of the operations team for about 25 Linux systems and networks

Jan 2001 - Feb 2006

5 years 2 months

Hamburg, Germany

Project Manager IT

Software

Designed, implemented, and managed various projects in the finance sector based on Linux, Java EE, and Apple WebObjects

Jan 2000 - Dec 2001

2 years

Hamburg, Germany

Developer

Software

Design and implementation of a journalistic image database and marketplace

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Manufacturing, Information Technology, Banking and Finance, Media and Entertainment, Retail, and Insurance.

Manufacturing

Information Technology

Banking and Finance

Media and Entertainment

Retail

Insurance

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, Marketing, Operations, Project Management, and Quality Assurance.

Information Technology

Product Development

Marketing

Operations

Project Management

Quality Assurance

Skills

Skill Focus:

Devops
Continuous Delivery
Architecture
Cloud
Java
Spring Boot
Terraform
Kubernetes

Methodology/mindset:

Devops
Lean
Agile
Kanban
Scrum
Oo
Functional
Tdd
Bdd
Patterns

Architecture:

Humans
Microservices
Event Driven
Domain Driven
Layered
Mvc
C4

Infrastructure:

Cloud Native
Kubernetes
Openshift
Aws
Gcp
Azure
Linux
Containers
Docker
Serverless
Service Mesh
Istio
Traefik
Apigee
Vmware
Kvm

Protocols:

Rest
Openapi
Graphql
Rpc
Grpc

Platforms/languages:

Java
Clojure
Groovy
Go
Python
Javascript
Shell

Testing:

Postman/newman
Insomnia
Selenium
Junit
Mockito
Gherkin
Cucumber
Spock
Testcontainers
Property Based
K6
Litmuschaos

Ci/cd:

Gitops
Argocd
Flux
Github Actions
Azure Devops
Jenkins
Jenkins X
Ansible
Terraform
Maven
Gradle

Libraries/apis/sdks:

Spring
Grails
Jee
Alfresco
Bpmn
Jbpm
Activiti
Cmis

Databases:

Mysql
Postgresql
Oracle
Solr
Elasticsearch
Mongodb

Observability:

Prometheus
Grafana
Elk
Opentelemetry
Azure Application Insights
Gcp Monitoring
Aws Cloudwatch

Eventing/streaming:

Aws Sns/-sqs
Gcp Pubsub
Rabbitmq
Jms

Security:

Pki
Owasp
Zero Trust
Oauth2
Openid Connect
Saml
Tls
Waf
Gcp Cloud Armor

Mindset:

Trust Is The Basis Of Psychological Safety And More Important Than Technology.
Culture Is The Social Contract – "... Eats Strategy For Breakfast"
"We Shape Our Buildings; Thereafter They Shape Us"
One Team, One Goal
Change Is The Only Constant
Simplicity Matters
Learning Lasts A Lifetime

Highlights:

Discovery Of Devops Culture
Infrastructure As Code
Quantum Leap To Cloud Native
(Re-)discovery Of Lisp (Clojure)
Founding Of Pink Gorilla - A Clojure(script)-based Notebook With Platform Ambitions

Languages

German

Native

English

Advanced

French

Elementary

Education

University of Hamburg

Diploma in Physics · Physics · Hamburg, Germany

Certifications & licenses

AWS Certified Solutions Architect – Associate

Alfresco Certified Engineer

Certified Scrum Master

Sun Certified Enterprise Architect

Statistics

Experience

Total positions 21

Experience in Manufacturing 12.5 y

Avg length 1 y 10 m

Longest experience 12 y

Global Experience

Countries worked in 1 (Germany)

Primary country Germany

Expertise

Recent roles Lead Developer, Lead Developer Chaos, Lead Developer/Architect

Main industries Manufacturing, Information Technology, Banking and Finance

Main business areas Information Technology, Product Development, Marketing

Qualifications

Certifications earned 4

Profile

Created

June 2024

Last Update

March 2026

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Andreas based?

Andreas is based in Hamburg, Germany.

What languages does Andreas speak?

Andreas speaks the following languages: German (Native), English (Advanced), French (Elementary).

How many years of experience does Andreas have?

Andreas has at least 24 years of experience. During this time, Andreas has worked in at least 18 different roles and for 14 different companies. The average length of individual experience is 1 year and 2 months. Note that Andreas may not have shared all experience and actually has more experience.

What roles would Andreas be best suited for?

Based on recent experience, Andreas would be well-suited for roles such as: Lead Developer, Lead Developer Chaos, Lead Developer/Architect.

What is Andreas's latest experience?

Andreas's most recent position is Lead Developer at Software.

What companies has Andreas worked for in recent years?

In recent years, Andreas has worked for Software, Public Sector, Insurance, Food, and Warehouse Technology.

Which industries is Andreas most experienced in?

Andreas is most experienced in industries like Manufacturing, Information Technology, and Banking and Finance. Andreas also has some experience in Media and Entertainment, Retail, and Insurance.

Which business areas is Andreas most experienced in?

Andreas is most experienced in business areas like Information Technology, Product Development, and Marketing. Andreas also has some experience in Project Management, Operations, and Quality Assurance.

Which industries has Andreas worked in recently?

Andreas has recently worked in industries like Information Technology, Insurance, and Retail.

Which business areas has Andreas worked in recently?

Andreas has recently worked in business areas like Information Technology, Quality Assurance, and Operations.

What is Andreas's education?

Andreas attended University of Hamburg for Physics.

Does Andreas have any certificates?

Andreas has 4 certificates. Among them, these include: AWS Certified Solutions Architect – Associate, Alfresco Certified Engineer, and Certified Scrum Master.

What is the availability of Andreas?

Andreas is immediately available full-time for suitable projects.

What is the rate of Andreas?

Andreas's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.