Timo T.-Senior Full-Stack Developer with a passion for innovative solutions and the implementation of new technologies. Team player and
Check rate
Experience
Gronic Ident & Sign
Gronic Systems GmbH
Gronic Ident & Sign
Core technologies: Android, Jetpack Compose, Retrofit, Regula Document Reader, Adobe Sign
Android app on dedicated devices for identifications and electronic signatures at the PoS
PurSource
QA-Network GmbH
PurSource
Core technologies: C#, .NET 8, ASP.NET Core, EF Core, Typescript, Angular, OpenAI
AI-based project platform for matching IT projects
Missing Gear Veribill
Missing Gear Solutions GmbH
Missing Gear Veribill
OS: Windows, macOS
Database: SQLite
Core technologies: C#, .NET 8, Avalonia
Solution for SMEs to receive, check and create electronic invoices.
Missing Gear FaceAge
Missing Gear Solutions GmbH
Missing Gear FaceAge
OS: (Ubuntu) Linux
Core technologies: C#, .NET 8, Python, Keras, PyTorch, CV2
Age verification system based on artificial intelligence and machine learning.
Missing Gear Company Connect
Missing Gear Solutions GmbH
Missing Gear Company Connect
OS: Windows
Core technologies: C#, .NET 8, WireGuard
Automatic establishment of VPN connections for employees working from home and in the field.
Agent Supervisor
M.S.S. Vertriebsgesellschaft mbH
Agent Supervisor
OS: Windows
Database: Maria DB
Core technologies: C#, .NET 8, ASP.NET Core, EF Core, Typescript, Angular
Managing call centers, analyzing relevant data, and monitoring agents.
Vodafone easySign
IDnow GmbH / Vodafone Deutschland
Vodafone easySign
OS: Android, iOS
Core technologies: Android: Kotlin, Jetpack Compose, Retrofit; iOS: Swift, SwiftUI
Performing identifications and electronic signatures at the point of sale.
Sichdat 2.0
Chemical Check GmbH Gefahrstoffberatung
Sichdat 2.0
OS: Windows
Database: MS SQL Server
Core technologies: C#, .NET 8, ASP.NET Core, EF Core, Blazor, React.js
Web-based solution for creating and maintaining safety data sheets for chemical products.
AMP Online Ident
AMP Logistics BV
AMP Online Ident
OS: Android, iOS
Core technologies: Kotlin (Android), Swift (iOS), ReadID Framework, iProov
Performing identifications using NFC-enabled identity documents.
identity Online
IDnow GmbH
identity Online
OS: Android, iOS
Core technologies: Kotlin (Android), Swift (iOS), MicroBlink OCR, AusweisApp2, TokBox, Pusher
Performing identifications using various identification methods, including Videoldent, eID, and Autoldent.
identity Video
IDnow GmbH
identity Video
OS: (Ubuntu) Linux
Database: PostgreSQL
Core technologies: Ruby on Rails, Docker
Conducting video identifications.
Aldi Talk Registration
IDnow GmbH / MEDION / Aldi Talk
Aldi Talk Registration
OS: Android, iOS
Core technologies: Kotlin, Java (Android), Swift, Objective-C (iOS), MicroBlink OCR, AusweisApp2, TokBox, Pusher
Conducting identifications using various identification methods, including Videoldent, eID and Autoldent, to activate SIM cards online.
identity ShopIdent
IDnow GmbH / Lekkerland / ePay
identity ShopIdent
OS: Android
Core technologies: Kotlin, Jetpack Compose, Retrofit, MicroBlink OCR, AusweisApp2 SDK, Pusher
Conducting GWG-level identifications at the point of sale.
IT-Security as a Service
various clients (including M.S.S. Vertriebsgesellschaft mbH, ASM d.o.o., Coordinatio d.o.o.)
IT-Security as a Service
- Compliance with regulatory standards (GDPR, GWG, eIDAS)
- Threat modeling and risk assessment
- Application of security architectures (Zero Trust, Least Privilege, Defense in Depth)
- SBOM management and vulnerability monitoring
- Implementation of information security management systems (ISMS according to ISO 27001)
- Information security audits and consulting
- Penetration testing in cooperation with external partners
- Vulnerability scans
Identity Desktop Signer
Identity Trust Management GmbH
Identity Desktop Signer
OS: Windows
Core technologies: C#, .NET 5, Avalonia, node.js
Simple and user-friendly electronic signing of documents.
identity Core
Identity Trust Management GmbH
identity Core
OS: (Ubuntu) Linux
Database: MS SQL Server
Core technologies: PHP
Conducting identifications and electronic signatures.
Mopmaster
CleanPlus GmbH
Mopmaster
OS: MS Windows
Database: MySQL
Core technologies: C#, TypeScript, ASP.NET Core, EF Core, Angular, Angular Material
Web-based management of rented mops, analysis of business-relevant data, PDF output of reports and barcodes.
Managing Director and Chief Technology Officer
Identity Trust Management GmbH
Industry: KYC / identity service provider, digital identities and signatures
Tools: Jira, Confluence, GitLab, Figma, SalesForce, Visual Studio, Visual Studio Code, Android Studio, Xcode, VMware, Hyper-V, Linux, Ubuntu, Debian, Git, NPM, node.js, Webpack, Vite, Maven, Swagger, OpenAPI, KeyCloak, SonarQube, Puppet, Sophos Firewalls
Technologies: PHP, Laravel, Ruby on Rails, JavaScript, jQuery, vue.js, CSS, LeSS / Sass, HTML, Kotlin, Java, Jetpack Compose, Android XML Views, Retrofit, jUnit, Swift, Objective-C, AlamoFire, UIKit, Appium, Selenium, PostgreSQL, MS-SQL Server, T-SQL, HTTP, SSL / TLS, REST, JSON
Milestones:
- Achieved ISO 27001 certification as the first company in the KYC industry in Germany
- Go-live of the identity verification modules eID, SmartID and Giroldent
- Increased revenue by 35% and reduced IT costs by 25%
Responsibilities:
- Strategic and technological direction of the IT and product landscape
- Managed 16 employees in 3 teams
- Requirements management, project management
- Conducted code reviews
- Improved cybersecurity
- Selected and coordinated external service providers, cost controlling
- Optimized the hosting structure and hosting costs
- Introduced and maintained certifications according to eIDAS/VDG and ISO 27001
DSuite master data/TAS v4.0
Deloitte Deutschland
DSuite master data/TAS v4.0
OS: MS Windows
Database: MS SQL Server
Core technologies: C#, TypeScript, ASP.NET Core, Angular, Angular Material
Automated processing and submission of audit reports to BaFin.
PCM Web/AHP PE
CANCOM Pironet AG & Co. KG
PCM Web/AHP PE
OS: MS Windows
Database: MS SQL Server
Core technologies: C#, TypeScript, JavaScript, ASP.NET Core, Angular, MDB Bootstrap
Preparation of data for tax consulting of clients, interfaces to DATEV master data and power of attorney database.
Manager Application Development
Deloitte Deutschland
Industry: Management consulting
Tools: Team Foundation Server / TFS, GitLab, MS Project, Visual Studio, Visual Studio Code, Git, NPM, Node.js
Technologies: .NET (Core), C#, Entity Framework (Core), ASP.NET (Core), AutoMapper, Angular, TypeScript, JavaScript, CSS, HTML, Sharepoint, TCP/IP, HTTP, SSL / TLS, OData, REST, JSON, SOAP, XML
Milestones:
- Replacement of the old Sharepoint software for tax consulting for expats with a new SPA-based application
- Introduction of a talent management solution based on SAP SuccessFactors
- Establishment of interfaces to BaFin and DATEV
Tasks:
- Design and development of internal applications
- Design and implementation of interfaces to external systems, particularly DATEV and BaFin
- Management of internal and external developers
- Requirements management
ACM
CANCOM Pironet AG & Co. KG
ACM
OS: MS Windows
Core technologies: C#, WPF, WCF, Active Directory
Program for administering Active Directory forests.
Jewish Music Stream Chrome App/Extension
LevTec Media LLC
Jewish Music Stream Chrome App/Extension
OS: iOS 9+
Core technologies: Objective-C, Swift, Google Cast SDK
Streaming music player app for iOS.
Software Architect
CANCOM PIRONET AG & CO. KG
Industry: Cloud Computing
Tools: Team Foundation Server / TFS, GitLab, Team City, Visual Studio, Git, NPM, node.js, Active Directory, Citrix, Exchange, Swagger, OpenAPI
Technologies: .NET (Core), C#, Entity Framework (Core), ASP.NET (Core), AutoMapper, Angular, TypeScript, JavaScript, CSS, HTML, TCP/IP, HTTP, SSL / TLS, OData, REST, JSON, SOAP, XML, RabbitMQ, MQTT
Milestones:
- Design, implementation, and introduction of new management software for cloud services
- Design, implementation, and introduction of a self-service solution for customers
Tasks:
- Design and development of internal applications for managing cloud services and infrastructure
- Design and implementation of interfaces to third-party software
- Management of internal and external developers
- Training of prospective IT specialists
- Requirements management and project management
JJK Routing
JJK Verlagssoftware GmbH
JJK Routing
OS: MS Windows
Database: MS SQL Server
Core technologies: C#, ASP.NET, WCF
Optimization of delivery routes and sequences for newspaper distributors.
Managing Director and Chief Developer
Missing Gear Solutions GmbH
Industry: Development of custom software, IT and cybersecurity
Core Skills: C#, .NET, ASP.NET, Razor, Blazor, MAUI, Avalonia, WPF, TypeScript, JavaScript, Angular, React, vue.js, Python, CV2, Entity Framework, MS-SQL Server, MySQL, PostgreSQL, xUnit, Linux, Ubuntu, Docker, CI/CD, Jira, Confluence, Git, GitLab, GitHub
Tools: Jira, GitLab, Azure DevOps, Visual Studio, Visual Studio Code, JetBrains Rider, Android Studio, Xcode, Maven, Gradle, SPM, Nuget, RubyGems, NPM, Git, Vite, Webpack, Proxmox VE, Docker, Podman, Kubernetes, Linux, Ubuntu, Debian, RHEL, SuSE, Zabbix, KeyCloak, Swagger, OpenAPI, Ansible, Puppet, Terraform, Jenkins, Bash, Powershell, node.js, LLMs, oLLaMA, vLLM
Technologies: .NET / .NET Core, .NET Framework, C#, VB.NET, Entity Framework Core, ASP.NET Core, MVC, Mapster, AutoMapper, MAUI, WPF, WinForms, Avalonia, Angular, React, vue.js, TypeScript, JavaScript, Bootstrap, Tailwind, CSS, LeSS / Sass, HTML, Kotlin, Java, Jetpack Compose, Retrofit, Android, Swift, Objective-C, AlamoFire, SwiftUI, UIKit, Appium, Selenium, Espresso, jUnit, xUnit, NUnit, XCTest, XCUITest, PHP, Laravel, Ruby on Rails, Python, MySQL / MariaDB, PostgreSQL, MS-SQL Server, SQLite, MongoDB, MQTT, RabbitMQ, CI/CD, YAML, OIDC, OAuth, SAML, TCP/IP, HTTP, SSL / TLS, OData, REST, JSON
Responsibilities:
- Strategic direction of the company
- Requirements management, project management
- Code reviews
- Leading development projects as Software Architect and Chief Developer
- Managing 8 employees in 3 teams
- Employee training
- Ubuntu, Debian
- Red Hat, SuSE
- VMware, Proxmox VE
- Docker, Kubernetes
- Jira
- Confluence
- Git
- GitLab, GitHub
- Architecture / Software architecture
- Backend development
- Frontend development
- Database design
- Virtualization
- Containerization
- DevOps, CI/CD
- SOLID, Clean Code
Jewish Music Stream Android App
LevTec Media LLC
Jewish Music Stream Android App
OS: Android 4.0+
Core Technologies: Java, Google Services, Google Cast SDK
Streaming music player app for Android.
JJK Publishing Portal
JJK Verlagssoftware GmbH
JJK Publishing Portal
OS: Linux
Database: MySQL
Core Technologies: PHP 5.5, Typo3 6.2
CMS solution tailored to newspaper publishers, based on Typo3 and various extensions based on Typo3-Extbase.
JJK AdDesigner 3
JJK Verlagssoftware GmbH
JJK AdDesigner 3
OS: MS Windows
Database: MS SQL Server
Core Technologies: C#, ASP.NET, MVC, nHibernate, Castle Windsor, JavaScript, HTML, jQuery
Module for designing newspaper advertisements. Frontend implemented with JavaScript, SVG and HTML5.
Jewelry Appraisal
Goldschmiede Dippel GbR
Jewelry Appraisal
OS: MS Windows, Linux
Database: MySQL, SQLite
Core Technologies: Java SE, Swing, Hibernate, Guice
Program for creating jewelry appraisals.
JJK Media Database
JJK Verlagssoftware GmbH
JJK Media Database
OS: MS Windows
Database: MS SQL Server
Core technologies: C#, WPF, WCF, nHibernate, Castle Windsor, Silverlight
Expandable media management and search, implemented as a client-server system. Designed for good scalability.
JJK WebAd 3
JJK Verlagssoftware GmbH
JJK WebAd 3
OS: MS Windows
Database: MS SQL Server
Core technologies: C#, ASP.NET, MVC, nHibernate, Castle Windsor JavaScript, HTML, jQuery
Online system for placing newspaper ads and managing subscriptions.
Chrome App/Extension
LevTec Media LLC
Chrome App/Extension
OS: portable (Chrome Extension & Chrome App)
Core technologies: Chrome, JavaScript, HTML
Streaming music player implemented in HTML5
Team Lead Web Development
JJK VERLAGSSOFTWARE GMBH
Industry: Software provider for newspaper publishers
Tools: Visual Studio, Team Foundation Server / TFS, Subversion /SVN, Git, NPM, Node.js
Technologies: .NET, C#, Visual Basic .NET / VB.NET, nHibernate, ASP.NET, MVC, WebForms, Castle Windsor, jQuery, jQuery UI, JavaScript, HTML, CSS, SVG, PDF, PostScript, TYPO3, TypoScript, PHP, MS-SQL Server, TCP/IP, HTTP, SSL / TLS, AJAX, JSON, XML, OAuth, UML
Milestones:
- Design, development and launch of several new products
- Integration of various payment service providers into the existing platform
Responsibilities:
- Further development of the existing web solution for advertising newspapers
- Development of new web-based products
- Management of 5 employees, review of code changes
- Training of aspiring software developers
Kosy Enterprise
HKS Informatik GmbH
Kosy Enterprise
OS: MS Windows
Database: Firebird
Core technologies: Delphi, VCL, SQL
Controlling and cost accounting system, primarily for the energy industry. New development of the flagship product of HKS Informatik GmbH.
Software Developer
HKS INFORMATIK GMBH
Industry: Software provider for controlling and ERP solutions
Tools: Borland RAD Studio, Visual Studio, CVS, Subversion / SVN, Git, Mercurial
Technologies: Delphi, Object-Pascal, VCL, Win32, Win64, Visual Basic .NET / VB.NET, Visual Basic / VB, Visual Basic for Applications / VBA, C#, .NET, Firebird SQL, PostgreSQL, MS-SQL Server, CSV, XML, XSLT, UML, TCP/IP
Milestones:
- New development of a dynamic data import system for imports from ERP systems, especially from SAP and Schleupen CS
Tasks:
- New development of Windows applications
- Further development of existing applications
Kosy 4
HKS Informatik GmbH
Kosy 4
OS: MS Windows
Database: Borland Paradox
Core technologies: Delphi, VCL, Paradox, SQL
Controlling and cost accounting system, primarily for the energy industry. Former flagship product of HKS Informatik.
SaPaC
HKS Informatik GmbH
SaPaC
OS: MS Windows
Core technologies: Delphi, VCL
Program for preparing data before importing it into Kosy 4 and Kosy Enterprise.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Media and Entertainment, Professional Services, Energy, Transportation, and Telecommunication.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Project Management, Strategy, Audit, and Business Intelligence.
Summary
Timo Tegtmeier – Software Architect, Senior Full-Stack Developer & IT Security Specialist
I am Timo Tegtmeier and have been working as a software developer, software architect and technical manager for many years. Since 2016, I have been Managing Director and Chief Developer of Missing Gear Solutions GmbH. In this role, I combine my technical expertise with strategic responsibility, project management and the leadership of development teams.
My focus is on developing customized and demanding software solutions. I support projects holistically – from requirements analysis and architecture through the actual development to deployment, operation and further development.
My technical expertise
I work primarily with C#, .NET, ASP.NET Core, Blazor, TypeScript, JavaScript, Angular, React and Python. I have extensive experience in both backend and frontend development, as well as software architecture, database design and the development of distributed systems.
I also work extensively with Linux, virtualization, containerization and DevOps. My technical environment includes Ubuntu, Debian, Red Hat, SuSE, VMware, Proxmox VE, Docker and Kubernetes, among others. For automation and Infrastructure-as-Code, I use Ansible, Puppet and Terraform, among others.
Another part of my work includes CI/CD, Git-based development processes and modern development and automation tools.
Network, infrastructure and MikroTik
Through my work on software, infrastructure and security solutions, I also work with network and communication infrastructures. My technological environment includes TCP/IP, VPN, WireGuard, SSL/TLS and Linux-based systems, among others.
I also see a good connection to MikroTik here. With RouterOS and its corresponding hardware, MikroTik offers extensive options for routing, firewalling, VPN, VLANs and network management. These topics can be combined very well with my existing experience in network, Linux, security, virtualization and automation.
Especially when designing modern IT infrastructures, I do not view networks, servers, applications and security in isolation, but as one interconnected overall system.
Note: My current project overview does not show any specific MikroTik project experience. Therefore, in this profile I understand MikroTik as an additional technological focus and not as an already documented project reference.
IT security
A particular focus of my work is IT and cybersecurity. Since 2022, as part of “IT-Security as a Service”, among other things, I have been working on implementing and advising on security requirements.
My responsibilities include threat modeling, risk assessment, Zero Trust, Least Privilege, Defense in Depth, SBOM management, vulnerability monitoring and ISMS according to ISO 27001. I also support information security audits and work with external partners on penetration tests.
During my time as Managing Director and CTO of Identity Trust Management GmbH, IT security was also an essential part of my responsibilities. There, I was responsible, among other things, for improving cybersecurity, optimizing the hosting structure and introducing and maintaining certifications according to eIDAS/VDG and ISO 27001.
Architecture and leadership
In addition to my technical work, I have extensive experience leading development and IT teams.
At Missing Gear Solutions GmbH, I currently lead eight employees in three teams. My responsibilities include the company’s strategic direction, requirements and project management, code reviews and leading development projects as Software Architect and Chief Developer.
Previously, I was Managing Director and Chief Technology Officer of Identity Trust Management GmbH. There, I led 16 employees in three teams and was responsible, among other things, for the strategic and technological direction of the IT and product landscape, project management, cybersecurity, external service providers and optimizing the hosting structure.
My project experience
Throughout my career, I have implemented a wide range of software and IT projects. My experience ranges from classic business applications and cloud and infrastructure management to mobile applications, digital identities, electronic signatures and AI-based solutions.
Some of my more recent projects include:
PurSource: Development of an AI-based platform for matching IT projects using C#, .NET 8, ASP.NET Core, Entity Framework Core, Angular, TypeScript and OpenAI. Missing Gear FaceAge: Development of an AI- and machine-learning-based age verification system using C#, .NET 8, Python, Keras, PyTorch and Computer Vision. Missing Gear Company Connect: Development of a solution for automatically establishing VPN connections for employees working from home and in the field, based on C#, .NET 8 and WireGuard. Gronic Ident & Sign: Development of an Android application for identifications and electronic signatures at the point of sale. Sichdat 2.0: Development of a web-based solution for creating and maintaining safety data sheets using .NET 8, ASP.NET Core, Blazor and React. IT-Security as a Service: Consulting and implementation of security requirements, threat modeling, ISMS, vulnerability management and security architectures. My way of working
I combine technical depth with a holistic view of projects and IT landscapes. It is important to me not only to develop individual applications, but also to understand the entire technical environment and create sustainable solutions.
Through my experience in software architecture, development, DevOps, infrastructure, networking and IT security, I can assess technical relationships across different levels.
I work in a structured, goal-oriented and solution-oriented way and place great value on clean architectures, maintainable code, automated processes and good cooperation within interdisciplinary teams.
I complement my knowledge with certifications as Certified Scrum Master, Ausbilder nach AEVO and ITIL v3 Foundation. I completed my training as a Fachinformatiker für Anwendungsentwicklung in 2010 at IHK Niederrhein.
In summary
I see myself as a technical generalist with a strong focus on software development and architecture. My particular strength lies in connecting software, infrastructure, networking and security.
I bring experience from practical development as well as technical leadership and strategic planning. In my view, technologies such as MikroTik, Linux, VPN, virtualization, containerization and modern cloud/DevOps approaches can be integrated particularly well into holistic and secure IT infrastructures.
My goal is to structure complex technical requirements in an understandable way and use them to develop reliable, secure and maintainable solutions for the long term.
Skills
C#
Typescript
Javascript
Python
.Net
Asp.Net
Mvc
Razor
Blazor
Maui
Avalonia
Wpf
Angular
React
Vue.Js
Entity Framework
Ms-Sql Server
Mysql, Mariadb
Postgresql
Xunit
Linux
Mikrotik
Time Management
Goal Orientation
Employee Leadership
Training
Organization
Languages
Education
IHK Niederrhein
Fachinformatiker Anwendungsentwicklung · Application Development · Germany
Certifications & licenses
Statistics
Experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Timo is based in Essen, Germany and can operate in on-site, hybrid, and remote work models.
Timo speaks the following languages: German (Native), English (Advanced).
Timo has at least 19 years of experience. During this time, Timo has worked in at least 38 different roles and for 22 different companies. The average length of individual experience is 1 year and 6 months. Note that Timo may not have shared all experience and actually has more experience.
Based on recent experience, Timo would be well-suited for roles such as: Gronic Ident & Sign, PurSource, Missing Gear Veribill.
Timo's most recent position is Gronic Ident & Sign at Gronic Systems GmbH.
In recent years, Timo has worked for Gronic Systems GmbH, QA-Network GmbH, Missing Gear Solutions GmbH, M.S.S. Vertriebsgesellschaft mbH, and IDnow GmbH / Vodafone Deutschland.
Timo is most experienced in industries like Information Technology, Media and Entertainment, and Professional Services. Timo also has some experience in Energy, Transportation, and Telecommunication.
Timo is most experienced in business areas like Information Technology, Product Development, and Project Management. Timo also has some experience in Strategy, Audit, and Business Intelligence.
Timo has recently worked in industries like Information Technology, Media and Entertainment, and Professional Services.
Timo has recently worked in business areas like Information Technology, Product Development, and Project Management.
Timo attended IHK Niederrhein for Application Development.
Timo has 4 certificates. Among them, these include: Ausbildereignung / AEVO, Certified Scrum Master, and ITIL v3 Foundation.
Timo is immediately available part-time for suitable projects.
Daily rate distribution
The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.
Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 29 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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