Jens Meßinger - Fullstack Developer / Team Lead

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Hamburg, Germany

Experience

Nov 2022 - Present

3 years 3 months

Fullstack Developer / Team Lead

Self-employed (Meßinger & Rantzuch GbR)

Provided fullstack web development as a new development and replacement of existing desktop and web applications for an ERP solutions provider in the education sector
Analyzed and redesigned development processes and collaboration in distributed teams
Responsibilities included team leadership, conceptual design, architecture, implementation, DevOps and consulting
Technologies: C# & .NET (ASP.NET 7), Angular 14, JavaScript/TypeScript, OData/REST, SOAP, Azure DevOps
Integrated interfaces to educational providers and authorities

Sep 2022 - Oct 2022

2 months

Architect / Consultant

Self-employed (Meßinger & Rantzuch GbR)

Conducted feasibility analysis and prototype creation using latest .NET and Angular technologies with focus on mobile clients and integration into an existing application landscape
Responsibilities included conceptual design, architecture, implementation, DevOps and consulting
Technologies: C#, ASP.NET 6, .NET MAUI, WinUI 3, Angular 14, JavaScript/TypeScript, MS SQL Server, GitHub, Azure DevOps

Jan 2021 - Present

5 years 1 month

Software Architect / Consultant

Self-employed (Meßinger & Rantzuch GbR)

Developed and extended existing web applications and services for law firm management and document management within a complex application landscape
Responsibilities included conceptual design, architecture, implementation, DevOps and consulting
Technologies: C#, .NET Core, ASP.NET 6, Angular 11 & 12 with Kendo UI for Angular, JavaScript/TypeScript, MS SQL Server, Azure DevOps, Docker-based microservices, complex release management

Jan 2020 - Mar 2021

1 year 3 months

Solution Architect / Coach

Self-employed (Meßinger & Rantzuch GbR)

Developed and ported existing applications for production data acquisition as modular web apps using microservices
Handled communication and data exchange in industrial automation environments
Provided consulting and Scrum coaching
Technologies: C# & .NET Core 3, Docker microservices, OPC/OPC UA, Oracle DB, Kepware KEPServerEX, Azure Functions, Azure App Services, GxP/GMP/CSV compliance

Apr 2019 - Jan 2020

10 months

Software Developer / Consultant

Self-employed (Meßinger & Rantzuch GbR)

Extended (Delphi, C#) and ported (Delphi to C#) in-house software solutions for production data acquisition
Provided architecture, implementation, consulting and coaching to transition from waterfall to Scrum
Technologies: C#, .NET, Delphi, Oracle DB, Waterfall & Scrum, CSV validation

Dec 2018 - Mar 2019

4 months

Software Developer

Self-employed (Meßinger & Rantzuch GbR)

Replaced and re-implemented in-house ERP+CRM solution with new cloud-based microservices architecture on AWS
Responsibilities included conceptual design, architecture and implementation
Technologies: AWS Lambda, OpenID Connect / OAuth 2, JavaScript/TypeScript, Angular 7, Bootstrap, Node.js, C# & .NET Core, MySQL, MS SQL Server, Docker microservices

Oct 2018 - Present

7 years 4 months

Developer

Self-employed (Meßinger & Rantzuch GbR)

Designed and implemented private client-server architecture project combining web and mobile apps with OpenID Connect authentication
Responsibilities included conceptual design, architecture and implementation
Technologies: REST, OpenID Connect / OAuth 2, C# & ASP.NET 6, MS SQL Server, Angular 11, Ionic 4, WPF, Azure Functions, App Services

Aug 2018 - Nov 2018

4 months

Developer

Self-employed (Meßinger & Rantzuch GbR)

Extended existing desktop software with a web application for public transport subcontractor data management and billing
Responsibilities included conceptual design, architecture and implementation
Technologies: C#, ASP.NET Core (MVC, Razor), MS SQL Server, Oracle DB, JavaScript, HTML5, CSS, Bootstrap, REST, Azure Functions, App Services

Mar 2018 - Aug 2018

6 months

Developer

Self-employed (Meßinger & Rantzuch GbR)

Implemented client-server system for fleet management using RabbitMQ and Elasticsearch
Responsibilities included implementation
Technologies: C#, ASP.NET, Oracle DB, RabbitMQ, Elasticsearch, AngularJS, JavaScript, Bootstrap, HTML5, CSS, REST

Jan 2018 - May 2018

5 months

Senior Developer / Part-Lead

Self-employed (Meßinger & Rantzuch GbR)

Developed server application to deliver tenant-specific information and functionality via REST API including client prototype
Responsibilities included sub-project leadership, conceptual design, architecture and implementation
Technologies: C#, ASP.NET Core, MS SQL Server, Angular 2+, Ionic 2+, TypeScript, Bootstrap, HTML5, CSS, REST, OAuth 2, Azure Functions, App Services

Nov 2016 - Sep 2017

11 months

Mobile & Server Developer / Part-Lead

Self-employed (Meßinger & Rantzuch GbR)

Developed mobile apps with dynamic offline-capable content and corresponding server application for service providers
Responsibilities included sub-project leadership, conceptual design, architecture and implementation
Technologies: C#, ASP.NET Web API 2, MS SQL Server, Angular 2+, Ionic 2+, TypeScript/JavaScript, Bootstrap, HTML5, CSS, REST, OAuth 2

Mar 2016 - Apr 2016

2 months

Scrum Coach / Workshop Trainer

Self-employed (Meßinger & Rantzuch GbR)

Conducted Scrum workshop and coaching for a mid-sized IT company
Covered Scrum basics and agile transformation of development process including team and management coaching

Jan 2016 - Dec 2017

2 years

Software Architect / Coach

Self-employed (Meßinger & Rantzuch GbR)

Designed distributed workplace system for service technicians using service-oriented client-server architecture for desktop and mobile clients
Provided consulting and coaching on Kanban and automated testing
Technologies: C#, ASP.NET Web API 2 & Core, WPF, UWP, MS SQL Server, Azure App Services, VMs, Kanban

Nov 2014 - Apr 2017

2 years 6 months

Scrum Workshop Trainer

Self-employed (Meßinger & Rantzuch GbR)

Delivered multiple Scrum workshops for a mid-sized IT company and its small to medium enterprise partners
Focus areas: Scrum basics, Scrum with external clients, adapted agile project management for small teams and non-continuous projects

Jun 2013 - Dec 2015

2 years 7 months

Developer / Coach

Self-employed (Meßinger & Rantzuch GbR)

Developed new workplace client application integrated with SAP ERP for service technicians
Responsibilities included implementation, architecture, Scrum coaching and automated testing
Technologies: VB.NET, WPF (custom layouts and components), MVVM, MS SQL Server, multi-layer architecture

Feb 2013 - May 2013

4 months

Framework Developer

Self-employed (Meßinger & Rantzuch GbR)

Designed and implemented highly modular framework for electronic publications (online/offline)
Developed core structure and plugin system for module integration
Technologies: .NET (C#, VB.NET), extensive interface definitions, plugin architecture, agile methods

May 2012 - Nov 2012

7 months

Project Lead / Developer

Self-employed (Meßinger & Rantzuch GbR)

Led development of software for automated georadar data processing for automatic structure identification and key figure determination
Defined physical and measurement prerequisites
Technologies: Delphi, import interfaces for various hardware formats, iterative project management

Jan 2011 - May 2011

5 months

Coach / Technical Lead

Self-employed (Meßinger & Rantzuch GbR)

Developed highly scalable framework for signal analysis and processing with flexible interfaces and coordinated external developers
Responsibilities included coaching on agile methods, sub-project leadership, architecture, design, implementation and documentation
Technologies: Delphi, modular design, design patterns, extensive interface definitions

Jan 2007 - Present

19 years 1 month

Agile Consultant

Self-employed (Meßinger & Rantzuch GbR)

Provided consulting and conception for EDV-product development for a mid-sized publishing house
Focus areas: development process design with agile principles, deployment and release planning, distributed applications and mobile clients

Skills

Software Development

Main Areas: Development, Architecture/design, Analysis & Consulting
Secondary: Testing, Documentation

Positions/roles

Main Areas: Senior Developer, Lead Developer
Project Dependent: Team Leadership

Knowledge

Operating Systems: Main Focus Ms Windows (All Versions); Android; Secondary Osx/ios And Linux
Programming Languages: Main: C#, Vb.net, Delphi/pascal, Typescript/javascript, Html5, Css, Xml, Sql; Secondary: Php, Vba, Visual Basic
.Net Technologies: .Net 7/core & .Net Framework 4.8; Asp.net (Razor, Mvc, Webapi); .Net Maui / Winui 3, Wpf, Windows Forms; Entity Framework / Ef Core; Additional Frameworks/libraries
Web Frameworks: Angular 2+, Ionic 2+, React, Bootstrap, Cordova
Environments: Ms Visual Studio, Visual Studio Code, Delphi/rad Studio
Devops: Azure Devops, Atlassian Suite, Github
Version Control: Git, Azure Devops / Tfs, Mercurial
Databases: Main Focus Ms Sql Server; Mysql, Sqlite, Oracle; Secondary Postgresql And Firebird
Delphi Technologies: Firemonkey, Intraweb, Etc.
Development Approaches: Agile Methods, Agile Processes, Microservices (E.g., With Docker), Automated Testing (Tdd, Bdd)
Communication: Rest, Tcp/ip, Opc / Opc Ua, Smtp, Pop3, Ftp, Http, Soap
Cloud: Services And Features For Microservices And Authentication (Openid Connect / Oauth 2); Providers: Ms Azure, Aws