07.08.2026 aktualisiert

**** ******** ****
80 % teilweise verfügbar

System Architect / Developer / Consultant / IT Team Enabler

Dresden, Deutschland
Nur Remote
Dresden, Deutschland
Nur Remote

Profilanlagen

2026-07-CV-Holger-Woltersdorf.pdf

Skills

HTMLJavaJavaScriptPHPAmazon Web ServicesApache HTTP ServerApple Mac SystemsAtlassian ConfluenceAtlassian JiraTest AutomationBash ShellBenchmarkingVoIPC#C++die Entwicklung von FähigkeitenCSSCloud ComputingCode-ReviewIt-BeratungBeratungContinuous IntegrationCqrsCronData MigrationDebian LinuxDue DiligenceZahlungssystemeVertriebFtpsGitHubGlobal System For Mobile CommunicationsIdentitätsmanagementJSONPostgreSQLLua ScriptingMariaDBVisual Basic .NETMongoDBMySQLMQTTNGINXNode.jsObjective-CPci DSSSoftwarewartungRedisMarkdownAnsiblePrometheusSwaggerSOAPSoftwareentwicklungStreamingSystemarchitekturAufgabenmanagementTechnologieforschungTypeScriptWeb ServicesExtensible Markup LanguageXML-RPCOpenapiModellierungsfähigkeitenBeurteilungen DurchführenFile Transfer Protocol (FTP)React.jsGrafanaInternet Of ThingsBackendGitLabGitInfluxDBCoaching und MentoringGnu-BetriebssystemGraphQLFront EndEvent-SourcingApi DesignRestful ApisgRPCDockerÄltere SystemeGolangProgramming Languages
System Architecture
  • Designing, planning, developing, operating and maintaining software solutions in distributed or interdependent systems
  • Technology research, benchmarking and decision-enabling
  • Data flow design and implementation, especially for IoT solutions
  • Event-based communication in complex systems (also Event Sourcing & Modelling)
Software Development / Programming languages:
  • Professional: PHP (25+ years of experience)
  • Professional: JavaScript / NodeJS / TypeScript / React
  • Semi-professional: Golang
  • Intermediate: Vlang
  • Intermediate: Java
  • Intermediate: Lua Script
  • Good: Bash
  • Good (outdated): C#
  • Good (outdated): VB.net
  • Good (outdated): C / C++
  • Good (outdated): Objective-C
I am a quick adopter of new programming languages and don't hesitate to use languages other than those listed above.

Consultancy
  • Professional code reviews and assessments
  • Technical due diligence
  • Guide to GDPR/DSGVO complicance
  • Guide to NIS-2 complicance
  • Strategic IT product (line) management
  • IT process and tool assessment
IT Team Enabling
  • Skill improving workshops
  • Team agreements and guidelines
  • Decision enabling 
  • Effective task management for IT Teams
  • Development process and environment improvements
  • Reduction of mental load
  • Teamlead coaching
Certifications:
  • BSI IT-Grundschutz Praktiker (Certificate ID: 2024000459), 2024
  • ONE IDENTITY Silver Partner, (Pre-)Sales Accredition, 2024
  • Leading hiring interviews (Testified by Ulf Uebel), 2008/2009


Other keywords that describe what I worked on:

AWS, Ansible, Apache, API development, MacOS, Automated tests, Backend development, Bash, HTML, CSS, cloud computing, CQRS, Confluence, CronTab, data migration, Debian Linux, Docker, Event Sourcing, XML, SFTP, FTPS, Frontend development, Git, GitHub, GitLab, GSM, golang, Grafana, GraphQL, gRPC, InfluxDB, Jira, JSON Schema, Java, JavaScript, Lua Script, MariaDB, Markdown, MQTT, MongoDB, MySQL, NGINX, NodeJS, OpenAPI, PCI compliance, legacy systems, online payment, PSP, PostgreSQL, Prometheus, Redis, RESTful APIs, SOAP, Swagger, RapidAPI, MQTTX, Timestream, IAM, VoIP, web services, XML-RPC, CI/CD, GNU Make, Flutter, Dart, iOS, Android

Erfahrung

Berufserfahrungmehr als 10 Jahre
Freelancer seit2014

Sprachen

DeutschMutterspracheEnglischverhandlungssicherFranzösischGrundkenntnisse

Projekthistorie

SOFTWARE ARCHITECT & CONSULTANT

MPOWR IT GmbH

Internet und Informationstechnologie

< 10 Mitarbeiter

* Professional system review and code analysis

* Introduction of Event Sourcing and Event Modelling in
conjunction with CQRS and modular software architecture

* Software development (PHP, JavaSctipt, Bash etc.)

* Test-driven data migration & development
* Skillset workshops for software testing and analysis

* Strategic consulting for product lines, lifetime & maintenance

* Recruiting support (interview participation, CV reviews)

* Team lead coaching

* Technical due diligence for investors & startups

* Technologies: PHP 7/8, PostgreSQL, MariaDB, MongoDB,
ArrangoDB, Prometheus, Grafana

CEO & CTO

From Home GmbH

Konsumgüter und Handel

10-50 Mitarbeiter

* Import and B2C reselling of Swedish groceries via online shop
onfos.de , logistics services

* Backend development with features for international
assortment & pricing management, supply-chain
management, order management, payment integration,
custom billing & VAT calculation, automated customer
communication, user management

* Headless frontend development with custom international
online shop in 3 languages with custom shipping-cost and
delivery rules, two different assortments and customised
stripe integration

* Automated test & deployment pipelines for dev, stage &
production
* Custom RediSearch implementation for the shop search

* Event Sourcing for order management

* Internal JSON APIs for backend-frontend communication

* Inter-unit process documentation

* Team building, recruiting

* Technologies: PHP 7/8, Docker, NGINX, Debian/Alpine Linux,
PostgreSQL, Redis, RediSearch, Bash

CIO

Fortuneglobe GmbH

Konsumgüter und Handel

50-250 Mitarbeiter

* B2B & B2C fashion eCommerce provider

* System and software design for customer eCommerce shops,
product and order data middlewares and integration of thridparty
order management and logistics systems

* FOSS web framework development (icehawk.github.io )

* Tech stack responsible person for hosting and development

* Head of dev, ops and project management teams

* Team building and guidelines, recruiting

* Data protection officer, GDPR implementation

* API development for large fashion portals like eBay, Zalando,
Otto, Karstadt, About You, Klingel etc.

* Technical consulting for B2B customers

* Technologies: PHP 5/7, Ansible, Docker, NGINX, Debian/Alpine
Linux, CentOS, GPG, SFTP, FTPS, XML-RPC, RESTful APIs

HEAD OF INTERNET SERVICES

IQ-optimize Software AG

Telekommunikation

10-50 Mitarbeiter

* B2B & B2C eCommerce for mobile telecom products

* Implementing headless online shops for various prepaid or
postpaid mobile contract brands like discotel, deutschlandsim,
winsim etc.

* Consolidation of multiple shop implementations to one multitenant,
multi-deploy framework

* Integration of a custom CMS backend to the shop framework

* API integration of internal logistics and billing web-services

* Implementation of a postal address validation web service
based on the DataFactory data from Deutsche Post

* Technologies: PHP 5, SOAP, JavaScript, HTML, CSS

CIO

eteleon e-solutions AG

Telekommunikation

50-250 Mitarbeiter

* B2B & B2C eCommerce for mobile telecommunication
products and mobile phones / accessory

* System and software design for customer eCommerce shops,
and complex custom backend solutions for order and mobile
contract management, customer service and logistics
processes

* Implementation of a custom affiliate network portal

* Integration of upselling providers like Groupon, Miles&More etc.

* PCI compliant processing of online payment via credit card

* Integration of SEPA direct debit, PayPal and pay per invoice

* Responsible person for TÜV certification of all online services
* Data protection officer

* Product development for first GSM to VoIP seamless handover
on the same mobile phone when switching from GSM to WiFi

* Implementation of a direct XML SFTP API with SCHUFA

* Process planning and automation

* Project and documentation management

* Team building & recruiting at secondary office in Dresden

* Implementing advanced B2B SMS web services

* Technical cooperations with freenet, Mobilcom, Debitel,
Deutsche Telekom, Vodafone, Telefonica (O )

* Technologies: PHP 4/5, Bash, JavaScript, HTML, CSS, Apache,
Debian Linux, NGINX, MySQL/MariaDB, SOAP, XML-RPC

SOFTWARE DEVELOPER

KSB Klinikberatung GmbH

Pharma und Medizintechnik

< 10 Mitarbeiter

* B2B Consulting company for German hospitals

* Implementing first-of-its-kind online quality report creator for
German hospitals which became mandatory by law in 2005

* Multistep session forms with plausibility checks, data imports
and creation of large (up to 250 pages) PDF files

* Technologies: PHP 4, JavaScript, HTML, CSS, MySQL

Zertifikate

BSI IT-Grundschutz Praktiker

Bundesamt für Sicherheit in der Informationstechnik (BSI)

2024

ONE IDENTITY Privileged Access Management Sales Accredition

QUEST

2024

Leading hiring interviews

Ulf Uebel Consulting

2010

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