Niklas Witzel-Senior IT Consultant
Check rate
Experience
AI Engineer
Tensora GmbH
- Designed and developed a multi-tenant SaaS platform enabling organizations to build their own knowledge bases and chat with brand-customized AI assistants (white-label approach with dynamic branding per organization).
- Implemented a scalable RAG architecture with a GPT-4o tool-use loop, hybrid semantic search, and strict tenant isolation at database and search index level.
- Built persistent, project-like chat sessions including a streaming API (SSE), multilingual support, and speech input/output (STT/TTS).
- Delivered the cloud infrastructure as Infrastructure-as-Code, fully automated per-customer CI/CD pipelines, and an onboarding process for new tenants.
Technologies used: Python, FastAPI, Pydantic (v2 noted), Next.js, React, TypeScript, Tailwind CSS, OpenAI / LLMs (GPT-4o), Azure AI Search, Cosmos DB, Azure Blob Storage, Azure Cognitive Services Speech, Azure App Service, Azure Container Registry, Retrieval-Augmented Generation (RAG), Server-Sent Events (SSE), Docker, Terraform, GitHub Actions, REST, OpenID Connect (OIDC), Multi-Tenancy
AI Engineer
enviaM (envia Mitteldeutsche Energie AG)
- Designed and developed an AI-powered web application that automatically converts screen recordings of business processes into structured Process Description Documents (PDDs).
- Built a multi-stage analysis pipeline: video processing, frame/OCR analysis, audio transcription, and LLM-based identification and documentation of individual process steps.
- Implemented templating and export logic for automated generation of DOCX and PDF documents according to customer templates, including result quality assurance.
- Delivered the solution as a scalable cloud application (backend, frontend, infrastructure-as-code) with asynchronous processing and progress tracking.
Technologies used: Python, FastAPI, Next.js, React, TypeScript, OpenAI / LLMs (GPT-4o), Whisper, Azure Blob Storage, Azure AI Vision, Azure Cognitive Services Speech, Azure Identity (AAD), FFmpeg, python-docx, Pydantic (v2 noted), Terraform, Docker, REST, Pytest, Tailwind CSS
AI Engineer
Jungheinrich AG
- Developed a multilingual, voice-first AI assistant to support internal knowledge and process questions across multiple use cases (e.g., cross-site knowledge transfer and maintenance support).
- Built a Retrieval-Augmented Generation (RAG) architecture with a central search component and configurable use-case profiles (persona, system prompt, knowledge base, languages).
- Designed and implemented a voice-to-voice orchestrator (speech-to-text → LLM tool use → text-to-speech) including session and language management.
- Integrated heterogeneous source documents (technical manuals, process descriptions) into a searchable knowledge base.
Technologies used: Python, FastAPI, Next.js, React, TypeScript, Azure App Service, Azure Blob Storage, Azure AI Search, OpenAI / LLMs (GPT-4o), Retrieval-Augmented Generation (RAG), Speech-to-Text / Text-to-Speech, Docker, CI/CD, Pydantic (v2 noted), REST
AI Engineer
Jungheinrich AG
- Took over and advanced a computer-vision system for automated quality inspection of components in forklift manufacturing (IO/NIO classification).
- Analyzed existing cloud architecture across multiple Azure subscriptions and designed/led migration to the customer's target tenant.
- Operated and optimized the end-to-end workflow: annotation → model training → deployment → inference via REST API.
- Extended inference and postprocessing logic (rule-based evaluation, composite models) and performed cost and right-sizing optimizations of cloud resources.
Technologies used: Python, FastAPI, YOLOv8, ONNX Runtime, Azure ML Workspace, Azure Functions, Azure Blob Storage, Azure App Service, Azure Container Registry, Azure Key Vault, Streamlit, Docker, GitHub Actions, CI/CD, CVAT.ai, REST, Terraform
Project Lead, AI Engineer, Cloud Solution Architect, Fullstack Developer
SoftwareGarage GmbH
- Design and implement an AI agent system for enriching product data with web search results
- Design asynchronous cloud-native architecture for maximum throughput
- AI consulting and project management
Technologies used: Python, Kanban, Microservice Architecture, Container-based Architecture, Event-driven Architecture, REST, AWS SNS / SQS, AWS, FastAPI, Terraform, GitHub, Docker, CI/CD, Visual Studio Code, MongoDB, Large Language Models, OpenAI GPT, Retrieval Augmented Generation (RAG), LangChain
Fullstack Developer
Tensora GmbH
- Creating a Computer Vision Framework and Service that allows the client to do automated crowd counting based on images, including self-developed perspective calculations and interpolation algorithms
- Built an enterprise-ready self-serviceable product out of the AI crowd counting core
Technologies used: Python, SQL, TypeScript, Jira, Confluence, Kanban, Microservice Architecture, Three-Layer Web Architecture, Container-based Architecture, REST, Azure, Streamlit, FastAPI, NextJS, Terraform, GitHub, Docker, CI/CD, Visual Studio Code, Jupyter Notebooks, GitHub Copilot, CosmosDB, Qdrant
AI Engineer, Cloud Solution Architect, Backend Developer
Henkel AG & Co. KGaA
- Generate hyperrealistic synthetic product photos in sceneries defined by user inputs
Technologies used: Python, TypeScript, Kanban, Monolithic Architecture, REST, Azure, Streamlit, FastAPI, NextJS, Terraform, GitHub, Docker, CI/CD, Visual Studio Code, CosmosDB, Azure AI Services, LangChain, Large Language Models
AI Engineer, Business Analyst, Project Manager
Deutsche Bank AG
- Introduce GenAI-powered solution for the creation of employee reference letters
- Introduce RAG-powered HR Support Chatbot
Technologies used: Python, SQL, Scrum, Jira, Confluence, Monolithic Architecture, Three-Layer Web Architecture, Container-based Architecture, REST, MS Power Plattform, GCP, Streamlit, FastAPI, Docker, Visual Studio Code, GitHub Copilot, CI/CD, OracleDB, Large Language Models, Google Gemini, Retrieval Augmented Generation (RAG)
AI Engineer, Cloud Solution Architect, Backend Developer
Tensora GmbH
- Select suitable candidates based on project descriptions (Candidate Matching)
Technologies used: German, English, Python, CSS, HTML, TypeScript, Linux, MacOS, Three-Layer Web Architecture, Container-based Architecture, Synchronous (REST API, GraphQL, WebSocket), Azure, App Service, Azure AI Services, Role Based Access Control (RBAC), API Management, React, NextJS, Streamlit, Terraform, GitHub, Docker, CI/CD, Visual Studio Code, Load Balancing, MongoDB, Qdrant, PostgreSQL, Large Language Models, OpenAI GPT, Retrieval Augmented Generation (RAG), Github Copilot
IT Consultant
Tensora GmbH
- Crafting cloud solutions with modern design principles
- Designing scalable systems using cutting-edge AI technologies
- Assessing client needs and providing expert technology recommendations
- Introduced AI-assisted coding practices (GitHub Copilot, Claude Code) to the delivery team; implemented guidelines and prompt templates for consistent code generation and review.
- Built Copilot-augmented development workflows in VS Code and CI to automate routine code stubs and test scaffolding, reducing initial development iteration time.
- Led internal training sessions on prompt engineering and safe usage patterns for LLM-driven code suggestions.
AI Engineer, Cloud Solution Architect, Backend Developer
Tensora GmbH
- Conceptualization
- Architecture consultation
- Fullstack Software Development
- Prompt Engineering
- Azure DevOps
Technologies used: German, English, Python, TypeScript, JavaScript, MacOS, Linux, Three-Layer Web Architecture, Monolithic Architecture, Container-based Architecture, Synchronous (REST API, GraphQL, WebSocket), Azure, App Service, Landing Zones, API Management, IAM, React, Streamlit, FastAPI, NextJS, Terraform, GitHub, Docker, CI/CD, Visual Studio Code, Qdrant, Large Language Models, OpenAI GPT, Anthropic Claude, Github Copilot, LangChain, Huggingface
Lead Cloud Solution Architect, Fullstack Developer, DevOps
Otto Group IT
- Structured architecture analysis of the status quo
- Identification of risks and potentials
- Development of a target architecture and detailed planning of the transformation process under consideration of complex system requirements
- General cloud consulting and training
Technologies used: German, English, Java, JavaScript, (No)SQL, Linux, Windows, Scrum, Jira, Confluence, Microservice Architecture, SOAP, Three-Layer Web Architecture, Event-driven Architecture, Container-based Architecture, Asynchronous (Kafka, RabbitMQ, MQTT, SNS / SQS, PubSub, ServiceBus), Synchronous (REST API, GraphQL, WebSocket), AWS, GCP, EC2, CloudTrail, API Gateway, ECS, Xray, RDS, EKS, Route53, DynamoDB, S3, IAM, SES, Lambda, CloudWatch, VPC, Kubernetes Engine, BigTable, Compute Engine, BigQuery, Cloud Functions, Analytics, Cloud Storage, Spring Framework, Spring Boot, Terraform, CloudFormation, GitHub, Docker, Kubernetes, CI/CD, IntelliJ, Visual Studio Code, PostgreSQL
Lead Cloud Solution Architect, Fullstack Developer, DevOps
Otto Group IT
- Design and detailed planning of the AWS-based native cloud architecture
- Technical coordination of development phases
- Test management
- Implementation of a Spring Boot REST API
- Implementation of AWS Lambda functions based on Java
Technologies used: German, English, Java, Python, JavaScript, (No)SQL, Windows, Linux, Scrum, Jira, Confluence, SER Doxis Suite, Microservice Architecture, Three-Layer Web Architecture, Event-driven Architecture, Container-based Architecture, Synchronous (REST API, GraphQL, WebSocket), Asynchronous (Kafka, RabbitMQ, MQTT, SNS / SQS, PubSub, ServiceBus), AWS, EC2, API Gateway, CloudTrail, ECS, RDS, Xray, EKS, DynamoDB, Route53, S3, IAM, SES, Lambda, CloudWatch, VPC, Spring Boot, Spring Framework, Terraform, GitHub, Docker, CI/CD, IntelliJ, Visual Studio Code
IT Consultant
cimt ag
- Process Automation of complex business processes
- Engineering of Cloud Microservices
- Cloud Transformation
- Assessing client needs and providing expert technology recommendations
- Internal consulting on generative AI technology and potentials
- Piloted Copilot-enabled pair programming across microservice development to accelerate prototyping and improve test coverage.
- Created prompt templates and developer playbooks to standardize AI-assisted code generation and review across teams.
Cloud Solution Architect, Fullstack Developer
Otto Payments
- Support for business and technical modeling of business processes using BPMN and DMN
- Automation of business processes using Camunda embedded in a Spring Boot / Java project
- Planning and implementation of interfaces and backend processes in the AWS cloud (SNS/SQS)
- Implementation of an own Camunda frontend based on mockups with Vue.JS and GraphQL
- Infrastructure as Code (IaC) with Terraform
- Technical coordination of development phases
- Test Management
Technologies used: English, German, Java, HTML, CSS, JavaScript, TypeScript, (No)SQL, Linux, Windows, Scrum, Confluence, Jira, Microservice Architecture, Three-Layer Web Architecture, Event-driven Architecture, Container-based Architecture, Asynchronous (Kafka, RabbitMQ, MQTT, SNS / SQS, PubSub, ServiceBus), Synchronous (REST API, GraphQL, WebSocket), Camunda 7 / 8 Framework, BPMN & DMN, AWS, ECS, S3, Lambda, CloudWatch, IAM, DynamoDB, API Gateway, Route53, VPC, React, Spring Framework, Spring Boot, NextJS, Terraform, GitHub, Docker, CI/CD, IntelliJ, Visual Studio Code, PostgreSQL, MongoDB, Prometheus, Grafana, Splunk, Kibana, Logstash
Founder
Niklas Witzel Software Development
- Freelancing
- Web & App Development
- Cloud Development
- Programming Coach and Lecturer
Fullstack Developer
bonprix Handelsgesellschaft mbH
- Planned and implemented automatic crawling of an ecommerce web shop
- Planned and implemented further analytics of the crawling results
Technologies used: Python, Java, Windows, Linux, Jira, Kanban, Confluence, Monolithic Architecture, Synchronous (REST API, GraphQL, WebSocket), GCP, Compute Engine, Cloud Functions, BigTable, Cloud Storage, GitLab, Huggingface, Jupyter Notebooks, Google Colab, PostgreSQL, Pandas, NumPy
Data Scientist
bonprix Handelsgesellschaft mbH
- Marketing-Mix-Modeling
- Recommendation Engine
- A/B Testing
Technologies used: English, German, Python, Linux, Windows, Scrum, Confluence, Jira, GCP, Compute Engine, Cloud Functions, BigTable, BigQuery, Analytics, VPC, IAM, Kubernetes Engine, Cloud Storage, GitLab, Kubernetes, PostgreSQL, MongoDB, Grafana, Prometheus, Jupyter Notebooks, Google Colab, NumPy, Pandas, Matplotlib, SciPy, Scikit-learn, Statsmodels, Seaborn, TensorFlow, PyTorch, Keras, YOLO, OpenCV, Huggingface
App Developer
bonprix Handelsgesellschaft mbH
- Further Development of the companies Android native shopping app
- Planning, Design and Implementation of new features
Technologies used: Java, Kotlin, Confluence, Jira, Scrum, Monolithic Architecture, Kafka, IntelliJ, GitLab, OracleDB, ElasticSearch
Fullstack Developer
bonprix Handelsgesellschaft mbH
- Further Development of the companies internal reporting system
- Planning, Design and Implementation of new features
Technologies used: Java, SQL, Kotlin, Confluence, Scrum, Jira, Microservice Architecture, Container-based Architecture, Event-driven Architecture, SOAP, Kafka, GraphQL, REST, Spring Framework, Spring Boot, Vaadin, Docker, IntelliJ, GitLab, OracleDB, Redis, PostgreSQL
Software Developer
bonprix Handelsgesellschaft mbH
- Academic Studies & Working in Applied Informatics
- Web & App Development
- Cloud Development
- Data Science
- SEO, SEA and SEM activities
Fullstack Developer
bonprix Handelsgesellschaft mbH
- Further Development of the company's internal purchasing systems
- Planning, Design and Implementation of new features
Technologies used: Java, SQL, Kotlin, Jira, Confluence, Scrum, Microservice Architecture, Event-driven Architecture, Container-based Architecture, Three-Layer Web Architecture, REST, Kafka, GraphQL, Spring Framework, Spring Boot, Vaadin, Thymeleaf, Docker, GitLab, IntelliJ, Kubernetes, OracleDB, PostgreSQL
Fullstack Developer
Toolstage Software Engineering
- Planning, design and implementation of diverse corporate websites utilizing Joomla CMS system
- Development of responsive templates for Joomla CMS system
Technologies used: JavaScript, SQL, Jira, Scrum, Three-Layer Web Architecture, REST, Wordpress, Thymeleaf, NodeJS, Angular, React, MariaDB, MySQL
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Fashion, Retail, Banking and Finance, Energy, and Utilities.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, Business Intelligence, Marketing, Project Management, and Quality Assurance.
Summary
Niklas is a forward-thinking IT consultant with a strong background as Cloud Solution Architect, Fullstack Developer and AI Engineer. His professional journey is highlighted by significant contributions to cloud transformation and web development projects as well as the advancement of generative AI technologies. Niklas' academic background in data science and his hands-on experience in agile environments underline his commitment to leveraging cutting-edge technology to foster innovation and efficiency. Senior IT Consultant and AI Engineer specializing in cloud-native systems and developer productivity. Expert in integrating AI-assisted coding agents (GitHub Copilot, Claude Code) into engineering workflows—accelerating delivery, improving code quality, and enabling prompt-driven automation.
Skills
- Cloud-Native Architectures
- Ai-Assisted Coding & Developer Productivity
- Generative Ai / Large Language Models
- Prompt Engineering For Code Generation
- Devops & Ci/Cd Automation
- Fullstack Development (Python, Java)
Languages
Education
NORDAKADEMIE Graduate School
Master of Science · Applied Data Science · Hamburg, Germany · 1,7
NORDAKADEMIE
Bachelor of Science · Applied Information Technology · Elmshorn, Germany · 1,8
Konrad Zuse Schule
Technical Baccalaureate · Information Technology · Hünfeld, Germany · 1,2
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Calculated based on our freelancers’ daily rates as of 21 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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