Thorsten Lenzen - Senior Developer & AppSec Specialist

Q: Where is Thorsten based?

Thorsten is based in Krefeld, Germany and can operate in on-site , hybrid , and remote work models.

Q: What languages does Thorsten speak?

Thorsten speaks the following languages: German (Native), English (Advanced), Spanish (Intermediate) .

Q: How many years of experience does Thorsten have?

Thorsten has at least 25 years of experience. During this time, Thorsten has worked in at least 15 different roles . The average length of individual experience is 1 year and 10 months . Note that Thorsten may not have shared all experience and actually has more experience.

Q: What is Thorsten's latest experience?

Thorsten's most recent position is Senior Security Analyst .

Q: Which industries is Thorsten most experienced in?

Thorsten is most experienced in industries like Information Technology (IT) , Professional Services , and Transportation and Logistics . Thorsten also has some experience in Government and Public Administration , Energy , and Manufacturing .

Q: Which business areas is Thorsten most experienced in?

Thorsten is most experienced in business areas like Information Technology (IT) , Product Development , and Marketing . Thorsten also has some experience in Sales , Operations , and Human Resources (HR) .

Q: Which industries has Thorsten worked in recently?

Thorsten has recently worked in industries like Information Technology (IT) , Transportation and Logistics , and Energy .

Q: Which business areas has Thorsten worked in recently?

Thorsten has recently worked in business areas like Information Technology (IT) and Product Development .

Q: What is Thorsten's education?

Thorsten holds a Bachelor in Electrical Engineering, Automation Engineering .

Recommended expert

Krefeld, Germany

Experience

Mar 2024 - Present

2 years

Senior Security Analyst

Analysis and remediation of security vulnerabilities in a risk assessment system for energy trading
System analysis
Threat modeling
Decision-making on vulnerability mitigation strategies
Implementation of vulnerability detection mechanisms
Security scans
DevSecOps practices
Technical environment: Visual Studio Code, JetBrains Suite, MS Threat Modeling Tool, DevSecOps, Git, AWS, DynamoDB, SQL Server, Endur, Snowflake, Orca
Languages: C#, JavaScript, TypeScript, Python, PowerShell, Bash, Terraform, SQL

Jan 2021 - Feb 2024

3 years 2 months

Senior Developer

Design and implementation of a system to optimize utilization on railway lines
Partial architecture and system design
Feature development
Technical leadership of the frontend team
Prototype creation
Conceptualization of automated integration testing
Design and implementation of CI/CD pipelines
Technical environment: Rider, DataGrip, Visual Studio Code, Git, ASP.Net Core WebApi, Angular, Docker, Angular CLI, Gulp, Node, REST, MySQL, AWS, Azure, Enterprise Architect, Microservices
Languages: C#, JavaScript, TypeScript, LINQ, UML

Oct 2019 - Dec 2020

1 year 3 months

Lead Developer

Architecture, design, and implementation of a Learning Management System within a microservices architecture
Coaching staff on technology and methodologies
Conceptualization and implementation of the CI/CD pipeline
Feature development
Technical leadership of the backend team
Concept for unit test creation
Technical environment: Rider, DataGrip, Visual Studio Code, Git, ASP.Net Core WebApi, Angular2+, Docker, Angular CLI, Gulp, Node, REST, MySQL, AWS, Azure, Enterprise Architect, Microservices
Languages: C#, JavaScript, TypeScript, LINQ, UML

Jun 2016 - Sep 2019

3 years 4 months

Lead Developer

Architecture, design, and implementation of a system for predicting infrastructure measures
System architecture and design
Technology selection
Feature development
Technical leadership of backend and frontend teams
Prototyping
Creation of automated integration tests
Technical environment: Visual Studio, Visual Studio Code, TFS, ASP.Net MVC WebApi, ASP.Net Core, Angular, Node, REST, Oracle, SQL Server, Enterprise Architect, Design Patterns, OWIN, Microservices
Languages: C#, JavaScript, TypeScript, UML, Regular Expressions

Nov 2015 - May 2016

7 months

Solution Architect

Architecture, design and implementation of a system for managing collaboration spaces
Responsible for feature implementation
Guidance of the development team
Technical environment: Visual Studio 2015, TFS 2015, ASP.Net MVC WebApi, REST, AngularJS, Gulp, Node, Enterprise Architect, Design Patterns
Languages: C#, JavaScript, TypeScript, LINQ, UML

Jul 2015 - Oct 2015

4 months

Solution Architect, Technical Project Lead

Architecture and design of a system for international trade fair and event planning
Responsible for feature implementation
Guidance of the development team
Development of time-critical components with high complexity
Technical environment: Visual Studio 2008–2015, TFS 2015, Silverlight, ASP.Net MVC WebApi, REST, AngularJS, Gulp, Node, Enterprise Architect, Design Patterns
Languages: C#, JavaScript, TypeScript, LINQ, UML

Apr 2015 - Jun 2015

3 months

Coach, Lead Developer

Review of the existing application landscape, standardization of architecture and design
Coaching in the implementation of the introduced structure
Technical environment: Windows Azure, Visual Studio 2008–2015, SVN, ASP.Net MVC, ASP.Net MVC WebApi, WPF, Enterprise Architect, Design Patterns, AngularJS, Microservices
Languages: C#, XAML, TypeScript, JavaScript, LINQ, UML

Feb 2014 - Oct 2014

9 months

Solution Architect, Technical Project Lead

Architecture, design and further development of a SmartHome home automation system sold directly to end consumers
Architecture and design of components
Responsible for feature implementation
Contact person and SPOC with the client
Guidance of the development team
Technical environment: Windows Azure, Visual Studio 2008–2013, TFS 2012, Silverlight, ASP.Net MVC, WCF, OCS, Enterprise Architect, Design Patterns, Microservices
Languages: C#, XAML, JavaScript, LINQ, UML

Jul 2013 - Jan 2014

7 months

Consultant, Business Developer

Support in building up a Microsoft development division including human resources, profiling, partnerships, marketing & sales
Social environment: people interaction, networking in the Microsoft environment

Dec 2012 - Feb 2013

3 months

Lead Developer

Design of a cloud-based architecture for connecting field service employees to the corporate network
Creation of an architecture blueprint, design creation and prototype development
Technical environment: Windows Azure (ACS, Azure AD, Service Bus), Visual Studio 2012, TFS 2012, WPF, WCF, Enterprise Architect, Design Patterns
Languages: C#, C++, XAML, LINQ, UML

Nov 2012 - Dec 2012

2 months

Technical Specialist, Senior Developer

Evaluation of the product “Service Bus for Windows Server 1.0”
Development of a strongly typed API layer for consuming REST services
Design of usage patterns for the product
Technical environment: Service Bus for Windows Server 1.0, Windows Server 2013, Visual Studio 2012, TFS 2012, WCF, Enterprise Architect, Design Patterns
Languages: C#, C++, XAML, LINQ, UML

Oct 2010 - Oct 2012

2 years 1 month

Branch Manager

Establishment of the Cologne branch of an internationally operating consulting firm
Branch setup, human resources, profile development, building partnerships, marketing & sales
Social environment: people interaction, networking in the Microsoft environment and developer circles, experience in the Microsoft business field

Sep 2009 - Oct 2012

3 years 2 months

Lead Architect, Team Coach, Team Lead

Redesign of the personnel management system for the state of North Rhine-Westphalia on Microsoft .NET
Reengineering of the legacy application
Creation of architectural blueprint and design specification
Development of a prototype
Adoption of SCRUM and test-driven development practices
Implementation of design patterns and service-oriented architecture components
Training and coaching
Representation in committees
Technical environment: Visual Studio 2008/2012, TFS 2010, Oracle 9i/10g, SQL Server 2008/2012, CodeRush, WPF, WF, Fluent NHibernate, LINQ to NHibernate, Entity Framework, LINQ to Entities, Enterprise Architect, Design Patterns, Reporting Services, REST, ASP.NET WebApi
Languages: C#, XAML, PL-SQL, T-SQL, LINQ, Visual Basic 6, VBA, RDL, UML

Feb 2008 - Oct 2008

9 months

Lead Architect, Technical Project Lead

Redesign of a Visual Basic-based controlling system and reimplementation on the .NET 3.0 platform
Leading workshops, designing components, prototyping, team coaching and leadership
Introduction of SOA
Technical environment: Visual Studio .NET 2008, MS SQL Server 2005/2008, MS Visual SourceSafe, TFS 2005, Office 2007, Design Patterns, Enterprise Application Integration, IT Security
Languages: C#, VB.NET, VBA, T-SQL, UML

May 2007 - Dec 2007

8 months

Lead Architect, Technical Project Lead

Migration of the Fuels Pricing System from Visual Basic 6 to the .NET platform with redesign and feature enhancements
Workshops, component design, prototyping, team coaching, SCRUM adoption, project leadership, Architecture Board representation
Technical environment: Visual Studio .NET 2005, MS SQL Server 2005, MS Visual SourceSafe, Design Patterns, Enterprise Application Integration, IT Security
Languages: C#, VB.NET, VBA, T-SQL, UML

Nov 2006 - Jun 2007

8 months

Lead Architect, Technical Project Lead

Development of a Word-based application for direct CMS input with integrated fax transmission services
Project management, requirements analysis consulting, concept & planning, client support, implementation supervision
Technical environment: Visual Studio 2005, Visual Studio Tools for Office, Office 2003
Languages: C#, VBA

Nov 2006 - Mar 2007

5 months

Technical Lead

Consolidation of requirements of all departments and suppliers for project management
Implementation of a service-oriented architecture with design and prototyping
Technical project management, workshops, architecture design
Technical environment: Visual Studio 2005, SQL Server 2000/2005, IIS, MCMS, MOSS
Languages: C#, ASP.NET, T-SQL

Oct 2005 - Jul 2006

10 months

Technical Lead

Migration from a heterogeneous application landscape to a unified, service-oriented Microsoft environment
Definition of target platform, application transfer, project lead coaching, workshops, prototyping
Technical environment: Visual Studio 2005, SQL Server 2000/2005, IIS, MCMS, MOSS, Oracle, Visio
Languages: C#, ASP.NET, T-SQL, PL-SQL

Jun 2005 - Apr 2006

11 months

Lead Developer

Extension of an automated analysis process for dental samples via a self-service portal with personalized findings
Architecture definition, project management, workshops, prototyping, development team leadership
Technical environment: Visual Studio 2005, SQL Server 2000, IIS, MS Access 2003
Languages: C#, ASP.NET, T-SQL

Jan 2005 - Jun 2010

5 years 6 months

Business Unit Manager

Established the Microsoft and Systems Solutions business unit for an international consulting firm
Branch setup, HR tasks, branding, partnership development, marketing & sales
Social environment: interacting with stakeholders, building networks in the Microsoft ecosystem and developer circles, hands-on experience in the Microsoft business sector

Oct 2004 - May 2005

8 months

Senior Developer

Developed a workflow for error logging in the billing chain and a complementary Access-based tool
Workflow definition with business users, tool implementation
Technical environment: MS Access XP/2003, Excel XP
Languages: VBA, Visual Basic 6

Jan 2004 - Sep 2004

9 months

Senior Developer

Developed master data management for a satellite-based HGV tolling system with numerous interfaces
Architecture design, development process planning, redesign and implementation of software components
Technical environment: Microsoft Visual Studio 2003, SQL Server 2000, Internet Information Server 5.0
Languages: C#, T-SQL

Sep 2003 - Dec 2003

4 months

Developer

Developed an application to automate recurring tasks in the client’s Microsoft Exchange environment
Technical environment: Visual Studio 2003, Exchange Server 2000, Windows Services
Languages: C#

Mar 2003 - Jul 2003

5 months

Developer, Technical Specialist

Defined a pan-European XML specification for vehicle data
Extended a used-car portal with web service support and distributed backend components
Delivered within a short project timeline
Technical environment: Visual Studio .NET, Visual Studio 6.0, IIS 5.0, SQL Server 2000, Windows 2000 Server, Web Services
Languages: C#, ASP.NET, ASP, Visual Basic 6, T-SQL, XML, WSDL

Jan 2003 - Aug 2003

8 months

Developer

Developed an automated analysis workflow for dental samples from data collection to diagnostic report generation
Functionality consulting, architecture design, implementation, testing, rollout
Expandability for web-based applications
Technical environment: Visual Studio 2003, IIS 5.0, SQL Server 2000, Access XP, Windows 2000 Server
Languages: C#, ASP.NET, T-SQL

Nov 2002 - Feb 2003

4 months

Developer

Designed a portal-based web application for selling legal literature with integrated shop system and customer modules
Consulting for requirements gathering and architecture design under strict budget constraints
Technical environment: Visual Studio .NET, IIS 6.0, SQL Server 2000, Windows Server 2003
Languages: C#, ASP.NET, T-SQL

May 2002 - Oct 2002

6 months

Developer

Designed and implemented a distributed extranet application for providing agent data
Extracted information from Navision, transformed to XML, published via web server
Scalability for future extension
Technical environment: Visual Studio .NET, IIS 5.0, MS Access XP, Navision Financials, Windows Server 2003
Languages: C#, ASP.NET, T-SQL

Mar 2001 - Apr 2002

1 year 2 months

Developer

Redesigned the user interface, state machine, and command lock functionality of a robot control system to improve usability and reliability
Technical environment: Visual Studio .NET, Anaconda, MS Access 97/XP
Languages: C#, Visual C++ 6.0

Jan 2000 - Feb 2001

1 year 2 months

Developer

Extended the control interface for industrial robots based on new customer requirements
Developed external interfaces for configuration and maintenance
Technical environment: Visual Studio 6.0, KCC (KUKA Control Center)
Languages: Visual C++ 6.0, Visual Basic 6, KRC (KUKA Robot Language)

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 (18.5 years), Professional Services (7.5 years), Transportation (4 years), Government and Administration (3 years), Energy (2.5 years), and Manufacturing (2.5 years).

Information Technology

Professional Services

Transportation

Government and Administration

Energy

Manufacturing

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 (22 years), Product Development (13.5 years), Marketing (8 years), Sales (8 years), Operations (5.5 years), and Project Management (3.5 years).

Information Technology

Product Development

Marketing

Sales

Operations

Project Management

Summary

Software architectures and software design
Fullstack implementation based on various technologies
Application Security
Technical project management and team coaching

Skills

Programming Languages, Frameworks

C#, Vb.net, F#
Wpf, Silverlight, Xaml, Wcf, Wf
Asp.net, Asp.net Core, .Net Core
Typescript, Javascript
Python
Java, Groovy
Angular, React, Jquery, Angularjs, Knockout
Css, Html, Xml, Xsl, Xsd
Visual Basic, Vba, Powershell, Bash
Ansi-sql, T-sql, Pl-sql
C, C++, Visual C++
Cypress, Selenium, Webdriver
Assembler, Lisp, Fortran, Prolog, Matlab
Sharepoint Server Side Object Model, Csom, Csrm

Databases

Ms Sql Server, Oracle
Mysql, Sql Lite
Mongo Db, Dynamodb
Hadoop, Hbase
Endur, Snowflake

Products, Development Environments, Etc.

Microsoft Visual Studio, Microsoft Visual Studio Code
Jet Brains Toolbox (E.g. Rider, Resharper, Intellij)
Cursor, Windsurf, Cursor Ai
Azure Devops Server, Team Foundation Server
Git, Jenkins
Enterprise Architect
Biztalk Server
Power Platform, Power Automate
Office365, Sharepoint
Azure Cloud, Amazon Web Services
Ms Dynamics Crm 6.0
Chatgpt, Github Copilot

Methodical Knowledge

Project Management
Design Patterns
Service Orientation (Soap, Rest, Graphql)
Oauth 2, Openid Connect
Application Lifecycle Management
Enterprise Application Integration
Test-driven Design
Domain-driven Design
Software Reengineering
Application Security / Threat Modeling
Software Security Development Lifecycle (Ssdl)
Agile Methods (Xp, Scrum, …)
Cross-platform Integration
No Sql, Polyglot Persistence
Directory Services (Ldap, Ad, Entraid, …)
Enterprise Architecture Frameworks (Togaf…)
Cloud Design

Languages

German

Native

English

Advanced

Spanish

Intermediate

Education

Diploma in Engineering · Electrical Engineering, Automation Engineering

Certifications & licenses

Certified Project Management Professional (PMP)

Certified ScrumMaster (CSM)

Certified TOGAF Practitioner

ITIL Foundation Certification

MCAD Microsoft Certified Application Developer

MCPD Web Developer

MCPD Windows Developer

MCTS Microsoft SharePoint Configuration

MCTS Microsoft SharePoint Development

Profile

Created

February 2026

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Frequently asked questions

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

Where is Thorsten based?

Thorsten is based in Krefeld, Germany and can operate in on-site, hybrid, and remote work models.

What languages does Thorsten speak?

Thorsten speaks the following languages: German (Native), English (Advanced), Spanish (Intermediate).

How many years of experience does Thorsten have?

Thorsten has at least 25 years of experience. During this time, Thorsten has worked in at least 15 different roles. The average length of individual experience is 1 year and 10 months. Note that Thorsten may not have shared all experience and actually has more experience.

What roles would Thorsten be best suited for?

Based on recent experience, Thorsten would be well-suited for roles such as: Senior Security Analyst, Senior Developer, Lead Developer.

What is Thorsten's latest experience?

Thorsten's most recent position is Senior Security Analyst.

Which industries is Thorsten most experienced in?

Thorsten is most experienced in industries like Information Technology (IT), Professional Services, and Transportation and Logistics. Thorsten also has some experience in Government and Public Administration, Energy, and Manufacturing.

Which business areas is Thorsten most experienced in?

Thorsten is most experienced in business areas like Information Technology (IT), Product Development, and Marketing. Thorsten also has some experience in Sales, Operations, and Human Resources (HR).

Which industries has Thorsten worked in recently?

Thorsten has recently worked in industries like Information Technology (IT), Transportation and Logistics, and Energy.

Which business areas has Thorsten worked in recently?

Thorsten has recently worked in business areas like Information Technology (IT) and Product Development.

What is Thorsten's education?

Thorsten holds a Bachelor in Electrical Engineering, Automation Engineering.

Does Thorsten have any certificates?

Thorsten has 9 certificates. Among them, these include: Certified Project Management Professional (PMP), Certified ScrumMaster (CSM), and Certified TOGAF Practitioner.

What is the availability of Thorsten?

Thorsten will be available full-time from April 2026.

What is the rate of Thorsten?

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