Developer with 15+ years of experience in creating complex integrations, backend systems, full-stack web applications and open-source tooling
Aktualisiert am 21.02.2025
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 01.04.2025
Verfügbar zu: 50%
davon vor Ort: 25%
TypeScript
Node.js
React
Laravel
ArangoDB
JavaScript
Fastify
PostgreSQL
SQLite
PHP 8
German
Muttersprache
English
fluent at near-native level

Einsatzorte

Einsatzorte

Rheda-Wiedenbrück (+500km)
Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

8 months
2024-07 - now

E-Learning platform modernization

Full Stack Developer Laravel PHP 8 TypeScript ...
Full Stack Developer

  • Migrating existing multi-service application to Laravel/Postgres
  • Streamlining service architecture to improve long-term maintainability
  • Reducing dependency complexity and improving testability
  • Includes contract work performed as Foss & Haas GmbH for direct customers

Laravel PHP 8 TypeScript React Intertia.js Node.js PostgreSQL SQLite
Rheda-Wiedenbrück
10 years 7 months
2014-08 - now

E-Learning platform for employee trainings

Full Stack Developer TypeScript Node.js React ...
Full Stack Developer

  • Replaces 3 day on-site trainings with single day assisted online trainings
  • Reduced friction to add new domain-specific trainings
  • Increased consistency in knowledge transfer outcomes
  • Easier tracking of mandatory trainings for regulatory compliance
  • Integration with internal proprietary knowledge management solution
  • Integration with LDAP and OIDC (Azure) for Active Directory authentication
  • Evolving feature set to support unique business requirements
  • Includes contract work performed as Foss & Haas GmbH for direct customers

TypeScript Node.js React ArangoDB Docker TailwindCSS JavaScript
Rheda-Wiedenbrück
10 years 7 months
2014-09 - 2025-03

JavaScript driver

TypeScript Developer TypeScript ArangoDB JavaScript ...
TypeScript Developer

  • 10,000 weekly downloads
  • Sole maintainer and developer for 10+ years
  • Collaborated closely with ArangoDB core development team to resolve inconsistencies in their HTTP API and documentation
  • Optimized driver code for 10x performance improvement in competitive benchmark
  • Migrated to TypeScript with inline documentation for significantly improved developer experience
  • Continuous delivery of API documentation with GitHub Actions
  • CommonJS + ESM support across different runtime environments
  • Contract work performed as Foss & Haas GmbH contractor for ArangoDB GmbH

ArangoDB GitHub Actions Typedoc
TypeScript ArangoDB JavaScript Continuous Delivery Continuous Integration CI/CD Dokumentation Technical Documentation
Köln
11 years 3 months
2014-01 - 2025-03

Foxx Microservice Framework

JavaScript Developer JavaScript ArangoDB Node.js ...
JavaScript Developer

  • USP for ArangoDB enabling dozens of enterprise sales and customer retention
  • Led full rewrite improving developer experience and learning curve
  • Identified previously unknown critical security vulnerabilities and attack vectors
  • Maintained and evolved framework as sole developer over 10+ years
  • Designed and implemented self-healing mechanism for cluster deployments
  • Wrote technical documentation, user guides, cookbook recipes and marketing tutorials
  • Contract work performed as Foss & Haas GmbH contractor for ArangoDB GmbH

ArangoDB
JavaScript ArangoDB Node.js OpenAPI Dokumentation Technical Documentation Python C++
Köln
1 month
2024-10 - 2024-10

Laravel Permission Objects

Laravel Developer Laravel PHP 8
Laravel Developer

  • Open source package for permission management in Laravel
  • Optional support for scoped permissions
  • Database structure / user model agnostic
  • Permissions defined in code, assignments stored in model
  • Instance-level permissions for eloquent models
  • Model-level permissions can be tied to any class, not just eloquent models
  • Supports role-based access control and user groups

Laravel PHP 8
Rheda-Wiedenbrück
3 years 2 months
2020-08 - 2023-09

Telephone Communications Provider Customer Service Interface

Full Stack Developer TypeScript React Node.js ...
Full Stack Developer

  • Enables customer service to manage phone number assignments and account status without deferring to technical administrators
  • Integration with proprietary third party API for phone number registrations and transfers
  • Integration with third party REST API for customer credentials and voice channel management
  • Detailed logging replaced shared mailbox for async transaction status updates
  • User-focused UI design reduces human errors by enforcing preconditions for destructive actions
  • Contract work performed as Foss & Haas GmbH contractor for direct customer

TypeScript React Node.js Fastify ArangoDB
Regional telphone communications provider
Rheda-Wiedenbrück
4 months
2020-05 - 2020-08

Multi-tenant app management interface

Full Stack Developer JavaScript Docker
Full Stack Developer

  • API for creating, updating and archiving tenants
  • Integrates with app's CI/CD pipeline to automatically update canary tenant
  • Built on docker-compose and GitHub container registry API

Docker GitHub Actions
JavaScript Docker
Rheda-Wiedenbrück
3 years 10 months
2016-11 - 2020-08

CLI for managing Foxx services

JavaScript Developer JavaScript Node.js
JavaScript Developer

  • Replaces dependency on ArangoDB client software for service management
  • Code generation wizard for rapid prototype development
  • Service installation, replacement/upgrade and removal
  • Interactive editing of service configuration and dependencies
  • Formats output from server-side test runner
  • Contract work performed as Foss & Haas GmbH contractor for ArangoDB GmbH

ArangoDB
JavaScript Node.js
Köln
2 months
2019-04 - 2019-05

Business Intelligence software connectors

JavaScript Developer JavaScript ArangoDB
JavaScript Developer

  • Implemented separate connectors for Qlik, Tableau, Power BI and Grafana
  • Wrote detailed setup and user guides used by marketing team for lead generation
  • Contract work performed as Foss & Haas GmbH contractor for ArangoDB GmbH

Qlik Tableau MS Power BI Grafana
JavaScript ArangoDB
Köln
5 years 3 months
2013-12 - 2019-02

Mein Apothekia: E-Learning for Pharmacy Technicians

Full-Stack-Entwickler Node.js React JavaScript ...
Full-Stack-Entwickler

  • Offers brand recognition and product awareness in key demographic for industry customers
  • Sole full stack developer and server administrator from pre-launch to handoff
  • Closely followed and advised changing product requirements
  • Integrated third-party services for physical letter delivery for identity verification
  • Implemented OAuth 2 server and client for unified user identity management across related services
  • Contract work performed as self-employed freelancer for direct customer

Node.js React JavaScript ArangoDB InfluxDB AngularJS
Köln
1 year 1 month
2013-05 - 2014-05

Social intranet site frontend

Frontend-Entwickler JavaScript jQuery Django ...
Frontend-Entwickler

  • Part of internal branding campaign for transnational industrial manufacturing company
  • Close collaboration with UI designer and system administrator
  • Built on Django REST Framework
  • Contract work performed as self-employed freelancer for B2B service provider

JavaScript jQuery Django Python
Köln
1 year 2 months
2012-01 - 2013-02

Hotel booking backoffice application

Frontend Developer JavaScript Node.js
Frontend Developer

  • Sole frontend developer
  • UI screens provided by customer using Sencha Architect visual code generation tool
  • Developed adaptive logic and internationalization layer allowing continuous use of visual code generator post-launch
  • Interfaced with pre-existing proprietary backend API
  • Contract work performed as self-employed freelancer for direct customer

Sencha Architect Ext Designer
JavaScript Node.js
B2B-Dienstleister für Hotelgewerbe
Neuss
2 years 8 months
2010-05 - 2012-12

Flash-based E-Learning for on-site seminars for medical professionals

Full Stack Developer ActionScript PHP MySQL
Full Stack Developer

  • Took over project after sole developer became unavailable without documentation or handoff
  • Moved from existing early prototype to stable release in <1 week
  • Software was reused with minor adjustments for 5 years for seminars presented by international pharmaceutical companies
  • Contract work performed as self-employed freelancer for direct customer

Adobe Flash phpMyAdmin
ActionScript PHP MySQL
Köln
1 year 8 months
2010-05 - 2011-12

Webcast directory and web forum for medical practitioners

Full Stack Developer Python JavaScript
Full Stack Developer

  • Contract work performed as self-employed freelancer for B2B service provider

CouchDB
Python JavaScript
Köln

Position

Position

  • Short-term and long-term projects
  • On-demand support possible
  • Individual contributor or supporting small teams
  • Legally secure contract partner as Foss & Haas GmbH

Kompetenzen

Kompetenzen

Top-Skills

TypeScript Node.js React Laravel ArangoDB JavaScript Fastify PostgreSQL SQLite PHP 8

Produkte / Standards / Erfahrungen / Methoden

API integrations
Experte
Node.js
Experte
Laravel
Django

Profil

  • Software developer with 15+ years of experience providing services including: creating complex integrations, backend systems, full-stack web applications, and open-source tooling. Specialities include TypeScript, Node.js, and API integrations. I have partnered with founders and small to mid-sized teams in a wide range of business domains and am committed to building robust software solutions with a focus on long-term maintenance and adapting to evolving business requirements.
  • Previous business domains include pharmaceutical, tourism and hospitality, film festivals, professional education, public sector and telecommunications.


Core Technologies

Frontend: React.js, TailwindCSS, Alpine


Technical Strengths

  • Quick to adapt to unique business domains
  • Expert in translating complex technical concepts and business processes
  • Experienced in tying together disparate systems and idiosyncratic APIs
  • Able to move between programming languages and paradigms as needed
  • Focus on creating intuitive, user-friendly and maintainable solutions

Programmiersprachen

TypeScript
Experte
JavaScript
Node.js
PHP 8
Laravel
Python

My speciality is TypeScript and Node.js. I switch between different programming languages and paradagims as needed and can also quickly develop an intuition in previously unknown environments.

Datenbanken

ArangoDB
Experte
PostgreSQL
SQLite
MySQL
MongoDB
CouchDB
InfluxDB
Contractor for ArangoDB for over 10 years. Comfortable with NoSQL and SQL databases alike.

Branchen

Branchen

I am quick to adapt to unique business domains and have partnered with founders and small to mid-sized teams in a wide range of industries, including:

  • pharmaceutical
  • tourism and hospitality
  • film festivals
  • professional education
  • public sector
  • telecommunications

Einsatzorte

Einsatzorte

Rheda-Wiedenbrück (+500km)
Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

8 months
2024-07 - now

E-Learning platform modernization

Full Stack Developer Laravel PHP 8 TypeScript ...
Full Stack Developer

  • Migrating existing multi-service application to Laravel/Postgres
  • Streamlining service architecture to improve long-term maintainability
  • Reducing dependency complexity and improving testability
  • Includes contract work performed as Foss & Haas GmbH for direct customers

Laravel PHP 8 TypeScript React Intertia.js Node.js PostgreSQL SQLite
Rheda-Wiedenbrück
10 years 7 months
2014-08 - now

E-Learning platform for employee trainings

Full Stack Developer TypeScript Node.js React ...
Full Stack Developer

  • Replaces 3 day on-site trainings with single day assisted online trainings
  • Reduced friction to add new domain-specific trainings
  • Increased consistency in knowledge transfer outcomes
  • Easier tracking of mandatory trainings for regulatory compliance
  • Integration with internal proprietary knowledge management solution
  • Integration with LDAP and OIDC (Azure) for Active Directory authentication
  • Evolving feature set to support unique business requirements
  • Includes contract work performed as Foss & Haas GmbH for direct customers

TypeScript Node.js React ArangoDB Docker TailwindCSS JavaScript
Rheda-Wiedenbrück
10 years 7 months
2014-09 - 2025-03

JavaScript driver

TypeScript Developer TypeScript ArangoDB JavaScript ...
TypeScript Developer

  • 10,000 weekly downloads
  • Sole maintainer and developer for 10+ years
  • Collaborated closely with ArangoDB core development team to resolve inconsistencies in their HTTP API and documentation
  • Optimized driver code for 10x performance improvement in competitive benchmark
  • Migrated to TypeScript with inline documentation for significantly improved developer experience
  • Continuous delivery of API documentation with GitHub Actions
  • CommonJS + ESM support across different runtime environments
  • Contract work performed as Foss & Haas GmbH contractor for ArangoDB GmbH

ArangoDB GitHub Actions Typedoc
TypeScript ArangoDB JavaScript Continuous Delivery Continuous Integration CI/CD Dokumentation Technical Documentation
Köln
11 years 3 months
2014-01 - 2025-03

Foxx Microservice Framework

JavaScript Developer JavaScript ArangoDB Node.js ...
JavaScript Developer

  • USP for ArangoDB enabling dozens of enterprise sales and customer retention
  • Led full rewrite improving developer experience and learning curve
  • Identified previously unknown critical security vulnerabilities and attack vectors
  • Maintained and evolved framework as sole developer over 10+ years
  • Designed and implemented self-healing mechanism for cluster deployments
  • Wrote technical documentation, user guides, cookbook recipes and marketing tutorials
  • Contract work performed as Foss & Haas GmbH contractor for ArangoDB GmbH

ArangoDB
JavaScript ArangoDB Node.js OpenAPI Dokumentation Technical Documentation Python C++
Köln
1 month
2024-10 - 2024-10

Laravel Permission Objects

Laravel Developer Laravel PHP 8
Laravel Developer

  • Open source package for permission management in Laravel
  • Optional support for scoped permissions
  • Database structure / user model agnostic
  • Permissions defined in code, assignments stored in model
  • Instance-level permissions for eloquent models
  • Model-level permissions can be tied to any class, not just eloquent models
  • Supports role-based access control and user groups

Laravel PHP 8
Rheda-Wiedenbrück
3 years 2 months
2020-08 - 2023-09

Telephone Communications Provider Customer Service Interface

Full Stack Developer TypeScript React Node.js ...
Full Stack Developer

  • Enables customer service to manage phone number assignments and account status without deferring to technical administrators
  • Integration with proprietary third party API for phone number registrations and transfers
  • Integration with third party REST API for customer credentials and voice channel management
  • Detailed logging replaced shared mailbox for async transaction status updates
  • User-focused UI design reduces human errors by enforcing preconditions for destructive actions
  • Contract work performed as Foss & Haas GmbH contractor for direct customer

TypeScript React Node.js Fastify ArangoDB
Regional telphone communications provider
Rheda-Wiedenbrück
4 months
2020-05 - 2020-08

Multi-tenant app management interface

Full Stack Developer JavaScript Docker
Full Stack Developer

  • API for creating, updating and archiving tenants
  • Integrates with app's CI/CD pipeline to automatically update canary tenant
  • Built on docker-compose and GitHub container registry API

Docker GitHub Actions
JavaScript Docker
Rheda-Wiedenbrück
3 years 10 months
2016-11 - 2020-08

CLI for managing Foxx services

JavaScript Developer JavaScript Node.js
JavaScript Developer

  • Replaces dependency on ArangoDB client software for service management
  • Code generation wizard for rapid prototype development
  • Service installation, replacement/upgrade and removal
  • Interactive editing of service configuration and dependencies
  • Formats output from server-side test runner
  • Contract work performed as Foss & Haas GmbH contractor for ArangoDB GmbH

ArangoDB
JavaScript Node.js
Köln
2 months
2019-04 - 2019-05

Business Intelligence software connectors

JavaScript Developer JavaScript ArangoDB
JavaScript Developer

  • Implemented separate connectors for Qlik, Tableau, Power BI and Grafana
  • Wrote detailed setup and user guides used by marketing team for lead generation
  • Contract work performed as Foss & Haas GmbH contractor for ArangoDB GmbH

Qlik Tableau MS Power BI Grafana
JavaScript ArangoDB
Köln
5 years 3 months
2013-12 - 2019-02

Mein Apothekia: E-Learning for Pharmacy Technicians

Full-Stack-Entwickler Node.js React JavaScript ...
Full-Stack-Entwickler

  • Offers brand recognition and product awareness in key demographic for industry customers
  • Sole full stack developer and server administrator from pre-launch to handoff
  • Closely followed and advised changing product requirements
  • Integrated third-party services for physical letter delivery for identity verification
  • Implemented OAuth 2 server and client for unified user identity management across related services
  • Contract work performed as self-employed freelancer for direct customer

Node.js React JavaScript ArangoDB InfluxDB AngularJS
Köln
1 year 1 month
2013-05 - 2014-05

Social intranet site frontend

Frontend-Entwickler JavaScript jQuery Django ...
Frontend-Entwickler

  • Part of internal branding campaign for transnational industrial manufacturing company
  • Close collaboration with UI designer and system administrator
  • Built on Django REST Framework
  • Contract work performed as self-employed freelancer for B2B service provider

JavaScript jQuery Django Python
Köln
1 year 2 months
2012-01 - 2013-02

Hotel booking backoffice application

Frontend Developer JavaScript Node.js
Frontend Developer

  • Sole frontend developer
  • UI screens provided by customer using Sencha Architect visual code generation tool
  • Developed adaptive logic and internationalization layer allowing continuous use of visual code generator post-launch
  • Interfaced with pre-existing proprietary backend API
  • Contract work performed as self-employed freelancer for direct customer

Sencha Architect Ext Designer
JavaScript Node.js
B2B-Dienstleister für Hotelgewerbe
Neuss
2 years 8 months
2010-05 - 2012-12

Flash-based E-Learning for on-site seminars for medical professionals

Full Stack Developer ActionScript PHP MySQL
Full Stack Developer

  • Took over project after sole developer became unavailable without documentation or handoff
  • Moved from existing early prototype to stable release in <1 week
  • Software was reused with minor adjustments for 5 years for seminars presented by international pharmaceutical companies
  • Contract work performed as self-employed freelancer for direct customer

Adobe Flash phpMyAdmin
ActionScript PHP MySQL
Köln
1 year 8 months
2010-05 - 2011-12

Webcast directory and web forum for medical practitioners

Full Stack Developer Python JavaScript
Full Stack Developer

  • Contract work performed as self-employed freelancer for B2B service provider

CouchDB
Python JavaScript
Köln

Position

Position

  • Short-term and long-term projects
  • On-demand support possible
  • Individual contributor or supporting small teams
  • Legally secure contract partner as Foss & Haas GmbH

Kompetenzen

Kompetenzen

Top-Skills

TypeScript Node.js React Laravel ArangoDB JavaScript Fastify PostgreSQL SQLite PHP 8

Produkte / Standards / Erfahrungen / Methoden

API integrations
Experte
Node.js
Experte
Laravel
Django

Profil

  • Software developer with 15+ years of experience providing services including: creating complex integrations, backend systems, full-stack web applications, and open-source tooling. Specialities include TypeScript, Node.js, and API integrations. I have partnered with founders and small to mid-sized teams in a wide range of business domains and am committed to building robust software solutions with a focus on long-term maintenance and adapting to evolving business requirements.
  • Previous business domains include pharmaceutical, tourism and hospitality, film festivals, professional education, public sector and telecommunications.


Core Technologies

Frontend: React.js, TailwindCSS, Alpine


Technical Strengths

  • Quick to adapt to unique business domains
  • Expert in translating complex technical concepts and business processes
  • Experienced in tying together disparate systems and idiosyncratic APIs
  • Able to move between programming languages and paradigms as needed
  • Focus on creating intuitive, user-friendly and maintainable solutions

Programmiersprachen

TypeScript
Experte
JavaScript
Node.js
PHP 8
Laravel
Python

My speciality is TypeScript and Node.js. I switch between different programming languages and paradagims as needed and can also quickly develop an intuition in previously unknown environments.

Datenbanken

ArangoDB
Experte
PostgreSQL
SQLite
MySQL
MongoDB
CouchDB
InfluxDB
Contractor for ArangoDB for over 10 years. Comfortable with NoSQL and SQL databases alike.

Branchen

Branchen

I am quick to adapt to unique business domains and have partnered with founders and small to mid-sized teams in a wide range of industries, including:

  • pharmaceutical
  • tourism and hospitality
  • film festivals
  • professional education
  • public sector
  • telecommunications

Vertrauen Sie auf Randstad

Im Bereich Freelancing
Im Bereich Arbeitnehmerüberlassung / Personalvermittlung

Fragen?

Rufen Sie uns an +49 89 500316-300 oder schreiben Sie uns:

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