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Maciej Modrzejewski-Independent AI Consultant / Machine Learning Engineer

Maciej Modrzejewski
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Walldorf, Germany

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Experience

Apr 2021 - Present

AI & Machine Learning Consultant

Self-employed

Position Summary
AI & Machine Learning Consultant at Self-employed
Industries
Professional Services
Business Areas
Information Technology
Product Development
Project Management
Explore Machine Learning Consultants in Germany Learn more
  • Led the technical implementation of several AI products for companies, including defining the software architecture, leading distributed development teams of ML and software engineers, and coordinating delivery with executives.
  • Developed and delivered 5+ production-ready AI products in the areas of machine translation, speech AI, document AI, conversational AI, and AI quality evaluation.
  • Built a multilingual machine translation platform with over 550 production-ready models for automated translation of documents and business content in more than 40 languages.
  • Built production-ready Conversational AI platforms using self-hosted Large Language Models (Qwen) with RAG pipelines, prompt engineering, tool calling, and secure enterprise deployments for internal knowledge assistants and customer-facing chatbots.
  • Developed AI orchestration frameworks for dynamic selection of foundation models and for optimizing the quality, latency, robustness, and cost of production AI systems.
  • Developed automated evaluation and monitoring pipelines for continuous quality assessment of Conversational AI systems, speech AI, and Large Language Models.
Jun 2020 - Mar 2021
Mannheim, Germany

Data Engineer

Siemens

Position Summary
Data Engineer at Siemens
Industries
Manufacturing
Business Areas
Business Intelligence
Information Technology
Explore Data Engineers in Germany Learn more
  • Analyzed over 110,000 employee feedback entries using machine learning methods to identify trends and areas for improvement.
  • Developed statistical methods for anomaly detection and analysis pipelines to support data-driven business decisions.
Apr 2016 - May 2020
Walldorf, Germany

Student Software Developer (Python)

SAP SE

Position Summary
Student Software Developer (Python) at SAP SE
Industries
Information Technology
Business Areas
Information Technology
Quality Assurance
Explore Python Developers in Germany Learn more
Explore Software Developers in Germany Learn more
  • Developed NLP solutions for multilingual text processing based on neural machine learning models.
  • Designed and implemented semantic integration and regression tests to ensure the quality and stability of production machine learning services.

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Professional Services, Information Technology, and Manufacturing.

Professional Services
Information Technology
Manufacturing
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Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, Project Management, Quality Assurance, and Business Intelligence.

Information Technology
Product Development
Project Management
Quality Assurance
Business Intelligence
Profile match chart

Summary

AI consultant and machine learning developer with over 5 years of experience in designing and implementing enterprise AI platforms in the areas of Conversational AI, multilingual NLP systems, speech technologies, and Generative AI. Experienced in leading cross-functional development teams, defining AI architectures, and building production-ready ML systems from research to large-scale deployment for enterprise customers.

Skills

  • Programming Languages: Python, Typescript, Sql, Bash

  • Machine Learning & Ai: Large Language Models (Gpt, Gemini, Claude), Natural Language Processing (Nlp), Neural Machine Translation (Nmt), Speech Ai, Retrieval-Augmented Generation (Rag), Prompt Engineering, Agentic Ai, Fine-Tuning, Quality Estimation (Qe), Automatic Post-Editing (Ape), Ocr, Document Ai

  • Mlops & Deployment: Docker, Kubernetes, Ci/Cd, Model Deployment, Ml Pipelines, Model Evaluation, Experiment Tracking, Production Monitoring, Rest Apis, Websockets

  • Cloud & Infrastructure: Azure Ai Services, Openai Api, Google Gemini Api, Azure Speech Services

  • Software Engineering: System Design, Distributed Systems, Microservices, Api Design, Asynchronous Programming, Git, Agile/Scrum

  • Ai Evaluation & Analytics: Llm Evaluation, Conversational Ai Evaluation, Translation Quality Evaluation, Speech Recognition Evaluation, Human-In-The-Loop Workflows, Ai Benchmarking

  • Leadership & Product: Technical Leadership, Ai Strategy, Solution Architecture, Stakeholder Management, Cross-Functional Team Leadership, Technical Mentoring, Product Roadmapping

Languages

German
Advanced

Education

Karlsruhe Institute of Technology (KIT)

Master of Science · Computer Science · Karlsruhe, Germany

RWTH Aachen University

Bachelor of Science · Computer Science · Aachen, Germany

Statistics

Experience

Total positions 3
Experience in Professional Services 5.5 y
Avg length 3 y 5 m
Longest experience 5 y 4 m

Global Experience

Countries worked in 1 (Germany)
Primary country Germany

Expertise

Recent roles AI & Machine Learning Consultant, Data Engineer, Student Software Developer (Python)
Main industries Professional Services, Information Technology, Manufacturing
Main business areas Information Technology, Product Development, Project Management

Qualifications

Highest degree Master

Profile

Created

Frequently asked questions

Have questions? Find more information here.

Maciej is based in Walldorf, Germany.

Maciej speaks the following languages: German (Advanced).

Maciej has at least 10 years of experience. During this time, Maciej has worked in at least 3 different roles and for 3 different companies. The average length of individual experience is 3 years and 5 months. Note that Maciej may not have shared all experience and actually has more experience.

Based on recent experience, Maciej would be well-suited for roles such as: AI & Machine Learning Consultant, Data Engineer, Student Software Developer (Python).

Maciej's most recent position is AI & Machine Learning Consultant at Self-employed.

In recent years, Maciej has worked for Self-employed.

Maciej is most experienced in industries like Professional Services, Information Technology, and Manufacturing.

Maciej is most experienced in business areas like Information Technology, Product Development, and Project Management. Maciej also has some experience in Quality Assurance and Business Intelligence.

Maciej has recently worked in industries like Professional Services.

Maciej has recently worked in business areas like Information Technology, Product Development, and Project Management.

Maciej holds a Master in Computer Science from Karlsruhe Institute of Technology (KIT) and a Bachelor in Computer Science from RWTH Aachen University.

Maciej will be available part-time from August 2026.

Maciej's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.

To hire Maciej, click the Meet button on the profile to request a meeting and discuss your project needs.

Daily Rate Distribution

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<€800 €800-1200 €1200-1600 €1600+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.

Average rates for similar positions

Rates are based on recent contracts and do not include FRATCH margin.

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Daily rate avg. 962 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

1000
750
500
250
Rate comparison chart
Median rate 960 €

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.

Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.