Björn HempelDevOps Engineer and Software Architect at ressourcenmangel GmbH with machine learning experience and more than 20 years of programming experience

About.

Björn HempelDevOps Engineer and Software Architect at ressourcenmangel GmbH with machine learning experience

Never Send a Human to do a Machine's Job
— Agent Smith —

Philosophy (Development)

SOA, IaC, Reusability, Furthermore: YAGNI, KISS, DRY, Clean Code, TDD, Software documentation, Semantic Versioning 2.0.0, Consistent coding conventions in the team, Modern software stacks

Philosophy (Release Management)

Plan ↷ Code ↷ Document ↷ Build ↷ Test Automation ↷ Release ↷ Deploy ↷ Operate ↷ Monitor ↷ Repeat

Key facts: Administration, automation, deployment, optimization and monitoring of software and technical systems. Development of web applications, APIs (API Platform) and services using Symfony 5/6. Encapsulation of applications using Docker and Docker Compose. Deploy via GitLab CD. Orchestration via Docker Swarm and Kubernetes. Simplification of methods in software development. Development of Software prototypes in the field of security, privacy, flexible software approaches. Technical documentation for software and systems. Consulting and peer review in teams. Testing and evaluation of new software tools. Development of deployment strategies, CI/CD pipelines and application of Software quality tools (static code analysis, PSR12, unittests, etc.).

Birthdate 02/02/1980
Phone (+49-151-70070706)
Emailbjoern@hempel.li
Projects github.com/ixnode, github.com/bjoern-hempel/welcome
Location Dresden, Germany

Portfolio Download Curriculum Vitae (German) Read in german

Curriculum Vitae.

My Employment

Since 2022-08

Software Architect and DevOps Engineer
ressourcenmangel Integral GmbH

Software development with PHP 8.2, Symfony 6.x, API Platform 3.x and PostgreSQL 14.x (microservices, APIs, complex ordering processes, etc.), PIM and CMS development with Pimcore 11.x, development of deployment strategies and introduction of software quality tools in the team (static code analysis tools, TDD, measurement detectors, etc.). Building CI/CD pipelines. Dockerization (packaging applications in Docker containers) for easy local development and orchestration on live systems, simplifying software development methodologies. Technical documentation for software and systems. Consulting and expertise in the team. Testing and assessing new software tools. Also: management, automation, deployment, optimization and monitoring of software and technical systems.

Technologies used: PHP 8.x, Symfony 6.x, Pimcore 11.x, MySQL 8.x, MariaDB 10.x, PostgreSQL 14.x, PHPStan (max Level), Rector, PHPMD, Docker Compose, Docker Swarm, GitLab/GitHub CI/CD Pipelines, PHPStorm, Git(Lab), Redmine, Jira. Bash 5.x, Debian 11/12. Hetzner. maxcluster.

2017-01 - 2022-07

DevOps Engineer and Software Architect
ressourcenmangel dresden GmbH

Administration, automation, deployment, optimisation and monitoring of software and technical systems. Development of deployment strategies and use of software quality tools. Building CI/CD Pipelines. Simplification of methods in software development. Development of software prototypes in the area of security, data protection, flexible software approaches. Technical documentation for software and systems. Consulting and expertise in teams. Testing and assessing new software tools. Promotion of young talent and students. Further: Assessment and grading of seminar papers. Bachelor thesis supervisor.

Technologies used: Linux. Debian. Container virtualization and orchestration via Docker, Docker Compose, Docker Swarm, Kubernetes. GitLab/GitHub CI/CD pipelines. Bash. PHP 7.x/8.x. Symfony 5/6 PHP Web Application Framework. MySQL. Git. Redmine. Jira. Hetzner. maxcluster. NETWAYS Web Services (OpenStack). AWS. Nagios. Icinga2. Markdown and Mermaid JS.

2014-08 - 2016-12

Technical Lead and Software Development
ressourcenmangel dresden GmbH

Leadership in the team. Carrying out resource planning. Participation in and evaluation of job interviews. Creating applicant tests. Passing on knowledge in the form of team presentations. Preparing quotation and effort estimates for tenders and software enhancements. Implementation and testing of productive work tools. Selection, preparation and maintenance of software and system architecture. Creation of software prototypes.

Technologies used: Linux, Debian, Bash, PHP, Symfony PHP Web Application Framework, Contao, API, MySQL, Git, Redmine, Hosteurope, Hetzner, Markdown and Mermaid JS, Powerpoint, Excel, Teambook

2012-11 - 2014-07

Technical Lead and Project Manager
ressourcenmangel dresden GmbH

Organisation and expertise in the team. Preparation of quotations and effort estimates. Resource planning. Preparation of Gantt charts for implementation planning and workload. Selection and preparation of software architecture. Creation of software prototypes.

Technologies used: Linux, Debian, Bash, PHP, Symfony PHP Web Application Framework, JavaScript, TypeScript, Contao, API, MySQL, Git, Redmine, Hosteurope, Hetzner, Markdown and Mermaid JS, Powerpoint, Excel

2007-07 - 2012-10

Web Application Developer
m-pathy (seto GmbH)

Co-development and new development as well as extensions of existing productive web applications (dashboards, search engines, keyword tool for a machine learning project, etc.). Development of acquisition and analysis tools for the acquisition of further internal customers. Co-development, operation and maintenance of a social media platform for the START-Stiftung gGmbH (Symfony Framework, Linux Server). Management and performance of Web programming lectures and workshops for the scholarship holders of the START-Stiftung gGmbH. First assignment and contact with the topic "New internet technologies vs Web 2.0".

Technologies used: Symfony PHP Web Application Framework, Prototype JavaScript Framework, (X)HTML, JavaScript, Ajax, CSS, PHP, Perl, MySQL, Subversion (SVN), Trac

2003-12 - 2007-06

PHP Web Application Developer
evolver media GmbH & Co. KG

Co-development and extension of existing theme portals. Media-related web development. Connection of the tools to various databases and interfaces of the corresponding companies: SAP (RFC), SOAP, MySQL, XML, QuarkXPress, [advantage], isygo/isyweb.

Technologies used: PHP, Perl, (X)HTML, JavaScript, Ajax, CSS, MySQL

2003-07 - 2003-11

C++/Java developer (Student Employee)
IAV GmbH

Development of a 3D FEM transformation software. Automated determination and identification of points of contact for the further calculation of the engineers. Development and use of an ABAQUS/PATRAN converter.

Technologies used: C++, Java, Bash, ABAQUS, PATRAN

2003-03 - 2003-08

PHP Developer
Ameco-Press GmbH

Co-development and extension of the event calendar of the advertising paper BLICK (https://www.blick.de).

Technologies used: PHP, MySQL, HTML, CSS

My Education

2019-11 - 2020-03

Bachelor Thesis (2020), Good
Chemnitz University of Technology , SEMKNOX GmbH

Topic: Investigation of strategies for image classification on small training data sets

Technologies used: Python, Latex, Keras, Data Augmentation, Convolutional Neural Network (CNN), Machine Learning, Deep Learning, Transfer learning, GPU Computing

Download: Bachelor Thesis

2017-10 - 2020-03

Bachelor Degree (Bachelor of Science - BSc), Good
Chemnitz University of Technology

Computational Science. Major in physics, mathematics and computer science. Minor in artificial intelligence and machine learning.

2000-10 - 2003-10

Study Computational Science
Chemnitz University of Technology

Major in physics, mathematics and computer science.

Skills.

Professional Skills (Diagram / Table)

PHP 8.x

90%
Python 3.7

50%
JavaScript ES6

70%
Bash Scripting 5.x

80%
Symfony 6.x and
API Platform 3.x

90%
Pimcore 11.x

70%
TDD, static analysis,
design patterns

80%
Docker and
Docker-Compose

90%
GitLab/GitHub CI/CD

80%

PHP 8.x

Object-oriented programming with PHP 8.x

Skill level: 90%

Python 3.7

Object-oriented programming with Python 3.7

Skill level: 50%

JavaScript ES6

Objektorientierte Programmierung mit JavaScript ES6

Skill level: 70%

Bash Scripting 5.x

Building Bash scripts for automated processes, help tools, etc.

Skill level: 80%

Symfony 6.x and API Platform 3.x

Building web applications, microservices, RESTful APIs, database integrations, etc. Using test-driven strategies with unit tests, integration tests and functional tests.

Skill level: 90%

Pimcore 11.x

Building (e-commerce) websites, digital asset management, content management, product catalogs, etc. (PIM, MDM, DAM, CMS). Integration of languages and localizations.

Skill level: 70%

TDD, static analysis, design patterns

Building applications with higher code quality, maintainability and faster development. Promote of better team collaboration (especially satisfaction and self-confidence), cost savings for complex applications, customer satisfaction for business-critical applications, etc.

Skill level: 80%

Docker and Docker-Compose

Building isolated containers for individual applications, simplifying local development environments (set-up and deployment), optimizing portability (Windows, Linux vs. Mac), local reproducibility of staging or production containers for failure analysis, automating container deployments, etc.

Skill level: 90%

GitLab/GitHub CI/CD

Release management of the software (tickets, documentation, etc.), integration of application testing and reporting of errors, building and provisioning of ready containers for deployment, automation of deployments (demo, stage, live), compliance with Semantic Versioning (Git Flow, Github Flow, Trunk Based Development - TBD), etc.

Skill level: 80%

Language Skills

Personal Skills

Purposeful
Independently
Responsible
Willing to compromise
Technophilic
Willing to learn

Work.

Docker Recipes Some Docker recipes to build and deploy docker images in devops

PHPCalendarAPI A Symfony 6.0 project with API Platform 2.6, CI/CD integration, Semantic Versioning 2.0.0, static code analysis, PHP 8.0, PHP coding standards fixer, etc. in coding

Keras Image Classifier A Keras machine learning framework to classify images (training and validation, Python 3.6) in coding

PHPVault A PHP library that allows a secure deployment process with .env files in coding

YADS A relational database to store document-oriented schematized data of all kinds (Symfony 5.3, PHP 8.0). in coding

BashVersionManager A tool to manage the version number within a project (mayor, minor, patch). Written in Bash. in devops

PHPJsonBeautifier A simple Symfony 5.3 project with CI/CD integration, Semantic Versioning 2.0.0, static code analysis, PHP 8.0, etc. in coding

Docker Compose LAMP Stack A docker-compose.yml LAMP Stack setup with traefik proxy integration. in devops

Grafana Dashboard Grafana Dashboard with Prometheus, Prometheus Node Exporter and cAdvisor (docker-compose.yml). in devops

Service Checker Service Test Tool written in Bash (Ping, Port, DNS, HTTP status code and SSL certificates) in devops

Cross-system encryption Hybrid, symmetric and asymmetric encryption with Bash, JavaScript and PHP in documentation

A+ Rating at ssllabs.com with Traefik in devops

A+ Rating at securityheaders.com in devops

Contact.

Map Location

Contact Info

Address

Königstr. 3, Dresden, Germany

Phone

+49-151-70070706

Email

bjoern@hempel.li

Björn HempelDevOps Engineer and Software Architect at ressourcenmangel GmbH with machine learning experience and more than 20 years of programming experience