Christian W.-Senior Full-Stack Developer
Check rate
Experience
Senior Full-Stack Developer
Quantrefy GmbH
- Developed a scalable middleware to connect 5 core ESG data provider APIs using Python (FastAPI, Django, Flask)
- Performed data analysis, reporting, and forecasting of ESG data with PHP (Laravel, Symfony)
- Integrated features into an existing data analytics platform, introducing React.js (Redux) with JavaScript/TypeScript after 1.5 years of stagnation
- Implemented comprehensive test automation using pest and unittest
- Built REST APIs and microservices for the Laravel backend, incorporating GitHub Actions
- Integrated LLM and GenAI capabilities
- Managed relational databases (PostgreSQL)
- Technologies: PHP (Laravel, Symfony), Python (FastAPI, Pandas, NumPy), AWS, Node.js (Fastify), AngularJS, TypeScript, Docker, Kubernetes (OpenShift)
Backend Developer
dmTECH GmbH
- Co-developed the GenAI platform “dmGPT” using Python (FastAPI, Chainlit) and a React frontend
- Developed specialized AI assistants and integrated Claude for internal process optimization
- Built an incident management assistant for faster, detailed ticketing
- Integrated SharePoint data sources and implemented a robust, containerized service architecture
- Provided company-wide support and presented solutions at internal fairs and events
- Technologies: Python (FastAPI, Pandas, Chainlit, SQLAlchemy), React (Redux), TypeScript, PostgreSQL, pgvector/Qdrant, Docker, Kubernetes, Helm, Azure; DevOps: GitLab, GitHub, CI/CD, Terraform; Vector databases: Qdrant, pgvector
Technical Implementation Engineer
Cobrainer GmbH
- Integrated 4 complex enterprise client systems into the Cobrainer talent platform
- Developed migration and integration APIs for seamless system connectivity
- Built an internal Python tool for managing client integration data
- Developed a web-based service management tool (React + Python + FastAPI) to monitor ongoing integration projects
- Integrated the OpenAI API for automated job descriptions and personalized sales demos
- Technologies: Python (Django, FastAPI, Pandas, NumPy, spaCy), Kotlin, React (Redux), JavaScript/TypeScript, Docker, Azure, AWS, PostgreSQL
IT Consultant
BCM Solutions GmbH
- Provided IT consulting and full stack development for two clients
- Co-developed a new sales platform with PHP and Vue.js; maintained and redesigned sales software (Polymer) for optimized user experience (Client: Adco AG)
- Led an internal department for system integrations and interface architectures
- Integrated client systems via API and middleware services (Client: Cobrainer GmbH)
- Technologies: Python (Django, FastAPI, Flask), PHP, Vue.js (Vuex), Polymer, Node.js (Fastify), React (Redux), JavaScript/TypeScript, Docker, Kubernetes, Azure, AWS, PostgreSQL
Full Stack Developer
Sternad Software GmbH
- Independently developed a custom ERP system for three SME clients
- Supported the replacement of legacy systems with the new ERP solution
- Provided direct client consulting on process digitization, data migration, and business process optimization
- Modernized a legacy crisis management system by upgrading PHP and database versions, integrating new APIs (Leitstelle Rhein-Neckar), and developing additional features
- Technologies: Python (Django, NumPy, Pandas), PHP (Zend1, Symfony), JavaScript, VueJS, Docker, Kubernetes, PostgreSQL
Full Stack Developer
heureka e-Business GmbH
- Redeveloped the company website using modern web technologies
- Developed custom tools for time tracking and objective project evaluation
- Introduced Docker for containerization and optimized development processes
- Migrated from SVN to Git and conducted Git workshops for colleagues
- Technologies: ColdFusion, React, JavaScript, Docker, PostgreSQL
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology and Professional Services.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Business Intelligence, and Project Management.
Summary
Senior Software Developer with 7+ years of experience in scalable web applications and cloud architectures. Specialized in Python, PHP, React.js, and REST APIs, with up-to-date expertise in GenAI/LLM integration.
Proven track record in enterprise system integrations, legacy modernization, and developing innovative AI-driven business solutions. Experienced in project management, client consulting, and technical team leadership.
Skills
- Esg Data Provider Apis
- Python (Fastapi, Django, Flask)
- Data Analysis, Reporting, And Forecasting Of Esg Data
- Php (Laravel, Symfony)
- Integration Into Existing Data Analytics Platform
- React.Js (Redux)
- Javascript / Typescript
- Implementation Of Comprehensive Test Automation With Pest/Unittest
- Node.Js (Fastify)
- Rest Apis & Microservices
- Github Actions
- Microsoft Azure
- Aws
- Angularjs
- Docker
- Docker & Kubernetes (Openshift)
- Llm & Genai Integration
- Test Automation
- Relational Databases (Postgresql)
- Vector Databases (Qdrant, Pgvector)
- Devops (Gitlab, Github, Ci/Cd, Terraform)
Languages
Education
Hochschule Pforzheim
Business Informatics · Pforzheim, Germany
Berufskolleg Robert-Bosch-Schule
State-certified technical assistant, college entrance qualification · Stuttgart, Germany
Certifications & licenses
IHK certified IT-Project Coordinator
IHK
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Christian is based in Wurmberg, Germany and can operate in on-site, hybrid, and remote work models.
Christian speaks the following languages: German (Native), English (Advanced).
Christian has at least 9 years of experience. During this time, Christian has worked in at least 5 different roles and for 6 different companies. The average length of individual experience is 1 year and 5 months. Note that Christian may not have shared all experience and actually has more experience.
Based on recent experience, Christian would be well-suited for roles such as: Senior Full-Stack Developer, Backend Developer, Technical Implementation Engineer.
Christian's most recent position is Senior Full-Stack Developer at Quantrefy GmbH.
In recent years, Christian has worked for Quantrefy GmbH, dmTECH GmbH, Cobrainer GmbH, and BCM Solutions GmbH.
Christian is most experienced in industries like Information Technology and Professional Services.
Christian is most experienced in business areas like Information Technology, Product Development, and Project Management. Christian also has some experience in Business Intelligence.
Christian has recently worked in industries like Information Technology and Professional Services.
Christian has recently worked in business areas like Information Technology, Product Development, and Project Management.
Christian attended Hochschule Pforzheim for Business Informatics.
Christian has 1 certificate: IHK certified IT-Project Coordinator.
The availability of Christian needs to be confirmed.
Daily rate distribution
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Average rates for similar positions
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The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 11 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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