Martin Wilhelmi - Security Auditor

Q: Where is Martin based?

Martin is based in Hamburg, Germany .

Q: What languages does Martin speak?

Martin speaks the following languages: German (Native), English (Advanced), Spanish (Elementary) .

Q: How many years of experience does Martin have?

Martin has at least 23 years of experience. During this time, Martin has worked in at least 14 different roles and for 20 different companies . The average length of individual experience is 1 year and 10 months . Note that Martin may not have shared all experience and actually has more experience.

Q: What is Martin's latest experience?

Martin's most recent position is Security Auditor at MissionMe .

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

In recent years, Martin has worked for MissionMe , Financial Industry (protected by NDA) , Medical Industry (protected by NDA) , Graylog , and Wedding Planner .

Q: Which industries is Martin most experienced in?

Martin is most experienced in industries like Information Technology (IT) , Professional Services , and Telecommunication . Martin also has some experience in Healthcare , Retail , and Advertising .

Q: Which business areas is Martin most experienced in?

Martin is most experienced in business areas like Information Technology (IT) , Product Development , and Operations . Martin also has some experience in Quality Assurance (QA) , Customer Service , and Accounting .

Q: Which industries has Martin worked in recently?

Martin has recently worked in industries like Information Technology (IT) , Telecommunication , and Healthcare .

Q: Which business areas has Martin worked in recently?

Martin has recently worked in business areas like Information Technology (IT) , Product Development , and Quality Assurance (QA) .

Recommended expert

Hamburg, Germany

Experience

Aug 2023 - Present

2 years 7 months

Security Auditor

MissionMe

Environment: AWS, Ruby on Rails, GraphQL, React Native
Penetration test for Backend, Android-App and iOS-App

May 2023 - Sep 2023

5 months

Senior Software Architect & DevOps Engineer

Financial Industry (protected by NDA)

Environment: Ansible, GitHub, GitHub Actions, WireGuard, Terraform, AWS, Ruby on Rails, Next.js, Docker, MSSQL
Provisioning special configured instances with Ansible on AWS
Build and development of new features
Backup strategy on AWS for MSSQL
Deploy staging and production environment on AWS with Terraform including S3, Elastic Beanstalk, EC2, SES, SNS and more services

Apr 2023 - Present

2 years 11 months

Senior Software Architect

Medical Industry (protected by NDA)

Environment: Ruby on Rails
Creating accounting software for billing
EDIFACT generation for GKV (statutory health insurance) billing
Testing

Sep 2022 - Nov 2022

3 months

Senior Software Architect

Graylog

Environment: OpenSearch, Python, Debian, Ubuntu, GitHub
Writing a design issue to document the approach to build a DEB package for OpenSearch
Extend OpenSearch Build project to build a DEB package

Apr 2022 - Nov 2022

8 months

Senior Software Architect

Graylog

Environment: React, TypeScript, Java, Docker, GitHub
Further development of the React frontend
Maintenance and refactorings of deprecated and legacy code
Development of new features

Oct 2021 - Present

4 years 5 months

Security Auditor

Medical Industry (protected by NDA)

Environment: Ruby on Rails, React Native, REST APIs
Penetration test for Backend, Android-App and iOS-App

May 2021 - Present

4 years 10 months

DevOps Engineer

MissionMe

Environment: AWS, Postfix, Dovecot, Sieve
Restructure sending and receiving emails
Transfer of support e-mails
Consulting for topics like AWS

Dec 2020 - Mar 2022

1 year 4 months

Senior Software Architect

Financial Industry (protected by NDA)

Environment: Vue.js, TypeScript, Ruby on Rails, GitLab, Cypress, Google Cloud
Further development of the Rails backend and the Vue.js frontend
Maintenance and refactorings of deprecated and legacy code
Development of new features

May 2020 - Jul 2023

3 years 3 months

Senior Developer & DevOps Engineer

Wedding Planner

Environment: AWS, GitHub Actions, CircleCI, Ansible, Ruby on Rails, Redis
Further development and relocation of the existing application
Provisioning new instances with Ansible on AWS
Development of new features
Maintenance

Jun 2019 - Apr 2020

11 months

Senior Developer & DevOps Engineer

MissionMe

Environment: React, React Native, TypeScript, AWS, Rails 5, GitHub, CircleCI, Stripe
Customizations for Strong Customer Authentication (SCA) with Stripe for one-time and repeat payments
Further development of the React frontend and Rails backend of two applications
Hosting a new application on AWS with Elastic Beanstalk

May 2019 - Jun 2019

2 months

DevOps Engineer

sum.cumo

Environment: Docker, Kubernetes, AWS, Rails 5, GitLab
Setting up a Kubernetes cluster on AWS
Connecting Kubernetes to GitLab's Review Apps feature
Docker container created from existing Rails, Scala and Node projects and its deployment in Kubernetes

Apr 2018 - Mar 2019

1 year

Senior Developer

XING – Startpage

Environment: Cassandra, Riak, Rails 5, Kubernetes, Docker, Kafka, Grafana, OpenStack, Elixir, RabbitMQ, Redis, Perl
Conversion of the application for parallel operation with Riak and Cassandra
Migration of data (many terabytes) from Riak into Cassandra during operation
Maintenance and refactorings of the projects
Development of new features

Feb 2018 - Present

8 years 1 month

Senior Software Architect & DevOps Engineer

Medical Industry (protected by NDA)

Environment: Ansible, Kubernetes, GitLab, GitLab Pipelines, Ruby on Rails, Docker, Icinga/Nagios, Hetzner Cloud
Provisioning new instances and bare metal servers with Ansible
Development of new features
Maintenance
Backup strategy
Penetration test for REST API/Backend/Android-App/iOS-App
Consulting for ISO 27001

Feb 2018 - Mar 2018

2 months

Senior Developer & DevOps Engineer

XING – Alexa Skill

Environment: TypeScript, AWS (Lambda)
Creating an Alexa skill which retrieves information from the user's profile and then plays it back

Nov 2017 - Mar 2018

5 months

Senior Developer

XING – Microsoft Outlook Add-Ins

Environment: React, Redux, TypeScript, Rails 5
Further development and maintenance of the XING Add-In
Implementation of new features
Development of the measures necessary for the GDPR

May 2017 - Aug 2017

4 months

Lead Developer, Senior Software Architect, Agile Coach

Portal for job advertisements (protected by NDA)

Environment: Elixir, Erlang, Ruby on Rails 5, Elasticsearch, Vue.js, Docker, Ansible, GitLab Pipelines, Kubernetes, Google Cloud Platform
Building new applications to replace the old platform
Hosting via Google Cloud
Coaching of the team and the customer

Jun 2015 - Present

10 years 9 months

Senior Developer

Freifunk iOS App

Jan 2015 - Apr 2017

2 years 4 months

Scrum Master, Lead Developer, Senior Developer, Product Owner, Product Manager, DevOps Engineer, IT-Leiter, Agile Coach, Senior

Avocado Store GmbH

Environment: Ruby on Rails 3-5, Docker, Ansible, AWS, Elasticsearch, Netdata
Introduction of processes with the help of Scrum
Creation of a customer database
Further development of the marketplace
Conversion of tracking (including Google e-commerce tracking)
Platform hosting including AWS, managed hosting, bare metal
Automation and connection of various parts
Platform monitoring

Jan 2014 - Sep 2014

9 months

Lead Developer & DevOps Engineer

METAFOTO GmbH

Environment: Ruby on Rails 4, Elasticsearch, Swift, Objective-C, RubyMotion
Establishment of a platform for licensing images
Create an iOS app and a REST API
Creating an Android app with a service provider

Jul 2013 - Oct 2013

4 months

Lead Developer & DevOps Engineer

Qwanji GmbH

Environment: Ruby on Rails, Ember.js, Babushka, WordPress
Establishment of a commentary platform
Hosting via managed hosting

Nov 2010 - Jun 2013

2 years 8 months

Lead Developer & DevOps Engineer

Wer liefert was? GmbH

Environment: Ruby on Rails 3-4, jQuery, Elasticsearch, Nginx, F5
Prototype creation
New development of the platform
Hosting via bare metal

Oct 2009 - Feb 2010

5 months

Developer & DevOps Engineer

Avocado Store GmbH

Environment: Ruby on Rails 2, AWS (EC2, Route 53, S3)
Setting up and developing a new marketplace
Hosting via Amazon Web Services

Jan 2008 - Sep 2009

1 year 9 months

Developer

WunderLOOP Media Service GmbH

Environment: Ruby on Rails 2, Emediate Ad Server, ExtJS
Further development of the Connect platform
Building the mobile ad targeting structure

Feb 2007 - Feb 2007

1 month

Co-author

Linux Professionell Magazine

Financial Management
Desktop-Publishing (DTP)

Jan 2007 - Jan 2008

1 year 1 month

Developer

Qype GmbH

Environment: Ruby on Rails 2, Puppet, Solr
Further development of the site
Internationalization (I18n)

Jan 2006 - Dec 2017

12 years

IT-Consultant

AKRA GmbH

Consulting for startups and relaunches
Development with Ruby on Rails, JavaScript, Objective-C, Swift, Elixir and others

Jan 2003 - Dec 2006

4 years

Trainee

Kontinuum Informationssysteme GmbH

Customer support for the CRM system, among others
Development with C++/PHP, among others
DevOps
Wi-Fi link over 7 kilometers
Telephone system software (self-developed and Asterisk)

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (23 years), Professional Services (15 years), Telecommunication (10.5 years), Healthcare (8 years), Retail (2.5 years), and Banking and Finance (1.5 years).

Information Technology

Professional Services

Telecommunication

Healthcare

Retail

Banking and Finance

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (23 years), Product Development (18 years), Operations (10.5 years), Quality Assurance (8 years), Customer Service (4 years), and Accounting (3 years).

Information Technology

Product Development

Operations

Quality Assurance

Customer Service

Accounting

Skills

Operating Systems

Linux (Debian, Ubuntu, Alpine, Openwrt, Fedora Etc.)
Macos
Windows
Freebsd Pfsense/opnsense

Programming Languages

Ruby (On Rails)
Javascript (Vue.js, Next.js, React, Redux With Typescript)
Swift
Erlang
Elixir
Sql
Python
Objective-c
C
C++
Html
Perl
Xml
Css
Tcl/tk

Hosting

Bare Metal
Hetzner
Amazon Web Services
Google Cloud Platform
Heroku
Scaleway

Operations Tools

Ansible
Docker
Kubernetes
Munin
Grafana
Chef
Puppet
Bind
Squid
Iptables
Postfix
Exim
Rspamd
Ssh
Nfs
Parallels
Vmware
Xen
Linux Software Raid
Asterisk
Elasticsearch
Solr/lucene
Ferret
Subversion
Cvs
Git
Gitlab
Ipv6
Amazon Ec2 Tools
Babushka
Jekyll
Openvpn
Nginx
Apache
And More

Databases

Postgresql
Mysql
Apache Cassandra
Couchdb
Memcached
Redis
Mongodb
Sqlite
Harmony

Project Management Methods

Xp
Scrum
Kanban

Languages

German

Native

English

Advanced

Spanish

Elementary

Profile

Created

December 2023

Last Update

January 2026

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Frequently asked questions

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

Where is Martin based?

Martin is based in Hamburg, Germany.

What languages does Martin speak?

Martin speaks the following languages: German (Native), English (Advanced), Spanish (Elementary).

How many years of experience does Martin have?

Martin has at least 23 years of experience. During this time, Martin has worked in at least 14 different roles and for 20 different companies. The average length of individual experience is 1 year and 10 months. Note that Martin may not have shared all experience and actually has more experience.

What roles would Martin be best suited for?

Based on recent experience, Martin would be well-suited for roles such as: Security Auditor, Senior Software Architect & DevOps Engineer, Senior Software Architect.

What is Martin's latest experience?

Martin's most recent position is Security Auditor at MissionMe.

What companies has Martin worked for in recent years?

In recent years, Martin has worked for MissionMe, Financial Industry (protected by NDA), Medical Industry (protected by NDA), Graylog, and Wedding Planner.

Which industries is Martin most experienced in?

Martin is most experienced in industries like Information Technology (IT), Professional Services, and Telecommunication. Martin also has some experience in Healthcare, Retail, and Advertising.

Which business areas is Martin most experienced in?

Martin is most experienced in business areas like Information Technology (IT), Product Development, and Operations. Martin also has some experience in Quality Assurance (QA), Customer Service, and Accounting.

Which industries has Martin worked in recently?

Martin has recently worked in industries like Information Technology (IT), Telecommunication, and Healthcare.

Which business areas has Martin worked in recently?

Martin has recently worked in business areas like Information Technology (IT), Product Development, and Quality Assurance (QA).

What is the availability of Martin?

Martin is immediately available full-time for suitable projects.

What is the rate of Martin?

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