David Hahn | Passionate Software Engineer

About Me

I have collected work experience for more than 10 years as a software engineer, and have worked for both small startups and large organizations. While I'm a proficient full-stack developer, my expertise is in building scalable web- and cross-plattform applications based on web technologies.

I'm a passionate agile software developer who has built software products thoroughly, provided guidance for teams to introduce agile methods and enabled customers realize their product vision.

I'm motivated by product success, not technology for technology's sake.

Here are a few things I'm experienced with:

JavaScript
TypeScript
HTML & CSS
React/Redux
Scrum
CI/CD
Gitlab (CI)
Blockchain
NodeJS
Docker
Java
.NET Core
SQL
Progressive Web Apps

Where I've Worked

Software Engineer @ Freelancer

2018 - Present

Conceptual design and development of a Progressive Web App to collect data using predifined checklists. Technologies used: TypeScript, React / Redux, PWA, .NET Core, MSSQL, Gitlab CI, Docker
Conceptual design and development of a configurable Progressive Web App with connection of Bluetooth devices for data acquisition. Used technologies: TypeScript, React / Redux, Cypress, PWA, .NET Core, MSSQL, Gitlab CI, Docker
Development of a decentralized social network for DASH Core Group, based on the Dash Blockchain. Used technologies: JavaScript, React / Redux
Conceptual design and development of a modular cross-platform desktop application for configuration, dosing and programming of household appliance machines. Used technologies: TypeScript, React / Redux, ElectronJS, Git, Gitlab CI, Docker

Senior Software Engineer @ SALT AND PEPPER Software

2016 - 2018

Conception and development of a web portal for the collection and analysis of slaughter data. Used technologies: JavaScript, AngularJS, .NET Core, Git, Gitlab CI, Docker
Development of a cross-platform word processing application using web technologies. Used technologies: TypeScript, React / Redux, ElectronJS, Git, Gitlab CI, Docker
Conducting of internal trainings on technical topics such as Git, GitLab, Continuous Integration
Planning and execution of Architecture Kata workshops
Planning and conducting of Scrum Master Certification Trainings
Support and consultance of various customers during the project periods

Senior Software Developer Portal @ Hellmann Worldwide Logistics

2013 - 2016

Conceptual design, technical responsibility and development of a web-based Track & Trace application for integration into WebSphere Portal, as well as a high-performance backend service for processing large, message-based amounts of data
Used technologies: Google Web Toolkit, Java / Java EE, Apache Solr, Oracle DB, Docker, IBM WebSphere, JBoss WildFly

Software Developer @ Nicetec

2008 - 2013

Development of a collection system for electronic health cards based on J2EE and .NET
Design and development of a J2EE (Server) & .NET (GUI) based project database in the field of claim management of public grant applications
Development of an accounting module in C ++ in the area of automatic process control and process monitoring
Development and maintenance of an eCommerce server for the connection and communication of online shops with warehouse management and financial accounting systems based on Java / J2EE and Oracle DB
Development of an Adobe Flex based management interface for implementation and monitoring of billing-relevant processes
Development of an ASP.NET-based web interface for storing user-specific indexing configurations in an Oracle database for a DMS project based on Sharepoint and SAP
Implementation and integration of a billing platform based on .NET and Oracle DB for the billing of self-dial-up connections in the ATM-BS network for an international broadband cable provider
Development of a client-server solution for secure collection of insured images for the electronic health card based on .NET (Client GUI) and JBoss Application Server as well as Oracle DB

What's Next?

Get In Touch

I'm always looking for interesting and challenging freelance opportunities. Whether for a potential project or just to say hi, I'll try my best to answer your email!

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