Jan Hertlein - Energy Consultant for Residential Buildings

Recommended expert

Freiburg im Breisgau, Germany

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Experience

May 2025 - Present

1 year 4 months

Freelance Energy Consultant

Energieberatung Hertlein

Energy consulting for residential buildings
Creation of individual renovation roadmaps
Preparation of energy performance certificates
Advice on and application for funding
Construction supervision

Apr 2024 - May 2025

1 year 2 months

Freiburg im Breisgau, Germany

Project Manager

greenventory GmbH

Project management of municipal heat planning projects in collaboration with municipalities, energy suppliers, and engineering firms
Preparation of inventory and potential analyses
Defining suitable areas and planning measures
Client support for software solutions
Establishment of knowledge management

Apr 2023 - Sep 2024

1 year 6 months

Waldkirch, Germany

Training Consultant & Team Coach

SICK AG

Team coaching and project management of strategic department projects
Introduction and support of new methods and agile working practices such as OKR and SCRUM
Facilitation of workshops and conducting training sessions
Creation of digital training materials

Feb 2019 - Mar 2023

4 years 2 months

Waldkirch, Germany

Head of Training Consulting

SICK AG

Building a team of seven people
Assuming personnel and professional leadership of the team
Representing the team in the business unit leadership

Jan 2017 - Jan 2019

2 years 1 month

Waldkirch, Germany

Training Consultant

SICK AG

Project management of department-wide and company-wide training projects
Expanding the existing training portfolio with customer trainings, including the development of initial products, market and competitor analysis, and marketing preparation
Project support for the SIA Campus in media infrastructure, commissioning, and employee onboarding
Advising business units on digitalization and Industry 4.0
Evaluating the feasibility of new methods and technologies
Supporting the sales organization in the development of current training products

Sep 2011 - Dec 2016

5 years 4 months

Waldkirch, Germany

Training Manager

SICK AG

Developing training plans and materials tailored to specific audiences
Planning and delivering product training for internal and external audiences
Introducing new training methods and materials such as blended learning, e-learning, hands-on training and video tutorials
Point of contact for all training topics in the business unit for sales and subsidiary companies

Feb 2008 - Aug 2011

3 years 7 months

Offenburg, Germany

Business Developer

Hansgrohe AG / Pontos GmbH

Developing international markets for greywater treatment and heat recovery technologies
Providing sales and service support for existing markets
Advancing innovations in collaboration with R&D
Project management of international cooperation projects and PPP initiatives
Focus regions: Southwestern Europe, South Africa, Middle East

Oct 2007 - Jan 2008

4 months

Freelancer

Speechless Engineered Translation

Continuing freelance translation work for Speechless – engineered translation
Translating technical texts from English to German and Spanish to German

Jan 2007 - Sep 2007

9 months

Eschborn, Germany

Junior Specialist

Deutsche Gesellschaft für Technische Zusammenarbeit (GTZ) GmbH

Project management in the ecosan sector project (circular wastewater and sanitation systems)
Managing EU cooperation projects with a regional focus on West Africa

Jan 2006 - Jan 2007

1 year 1 month

Hoisdorf, Germany

Managing Director

Jugendheim Lichtensee

Organizing occupancy and bookkeeping
Budget planning and responsibility
Organizing events
Representing the facility externally

Jan 2005 - Dec 2005

1 year

Hamburg, Germany

Project Engineer

Züblin Umwelttechnik GmbH

Project and plant support for large-scale process engineering facilities in the field of soil and groundwater remediation
Concept development and proposal preparation for international markets

Sep 2004 - Nov 2004

3 months

Bad Belzig, Germany

Intern

Ökotec GmbH

Technical supervision of a project on wastewater sanitization

Sep 2002 - Feb 2003

6 months

Tepotzotlán, Mexico

Practical Semester Student

Umweltschutz Nord GmbH

Collaboration in the BMBF research project on germ count reduction in wastewater through constructed wetlands

Industry Experience

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

Experienced in Manufacturing, Utilities, Energy, Education, Construction, and Professional Services.

Manufacturing

Utilities

Energy

Education

Construction

Professional Services

Business Area Experience

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

Experienced in Human Resources, Project Management, Sales, Product Development, Information Technology, and Marketing.

Human Resources

Project Management

Sales

Product Development

Information Technology

Marketing

Skills

Energy Calculation Software (Hottgenroth, Evebi)
Ms Office Suite, Sap
Project Management And Agile Tools (Atlassian Jira, Miro, Slack)
Scrum, Lego Serious Play (Certified Facilitator), Design Thinking
Authoring Tools (Articulate 360, Synthesia)

Languages

German

Native

English

Advanced

Spanish

Advanced

French

Elementary

Education

Sep 2003 - Jul 2004

Van Hall Instituut

Double degree as Dipl. Ing. (FH) Environmental Process Engineering and Environmental Engineer (B. Hons.) · Environmental Process Engineering with a focus on Environmental Science · Leeuwarden, Netherlands

Sep 2000 - Sep 2003

Fachhochschule Wilhelmshaven

Double degree as Dipl. Ing. (FH) Environmental Process Engineering and Environmental Engineer (B. Hons.) · Environmental Engineering (international degree program in Environmental Process Engineering) · Wilhelmshaven, Germany

Oct 1990 - Jun 1999

Kreisgymnasium Bargteheide

General university entrance qualification · Bargteheide, Germany

Certifications & licenses

LEGO Serious Play Methods And Materials

Leadership training

Transactional Analysis

E-trainer training

Statistics

Experience

Total positions 13

Experience in Manufacturing 16.5 y

Avg length 1 y 8 m

Longest experience 5 y 3 m

Global Experience

Countries worked in 2 (Germany, Mexico)

Primary country Germany

Expertise

Recent roles Freelance Energy Consultant, Project Manager, Training Consultant & Team Coach

Main industries Manufacturing, Utilities, Energy

Main business areas Human Resources, Project Management, Sales

Qualifications

Highest degree Bachelor

Certifications earned 5

Profile

Created

December 2025

Last Update

February 2026

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Frequently asked questions

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Jan is based in Freiburg im Breisgau, Germany and can operate in on-site, hybrid, and remote work models.

Jan speaks the following languages: German (Native), English (Advanced), Spanish (Advanced), French (Elementary).

Jan has at least 22 years of experience. During this time, Jan has worked in at least 13 different roles and for 10 different companies. The average length of individual experience is 2 years and 8 months. Note that Jan may not have shared all experience and actually has more experience.

Based on recent experience, Jan would be well-suited for roles such as: Freelance Energy Consultant, Project Manager, Training Consultant & Team Coach.

Jan's most recent position is Freelance Energy Consultant at Energieberatung Hertlein.

In recent years, Jan has worked for Energieberatung Hertlein, greenventory GmbH, and SICK AG.

Jan is most experienced in industries like Manufacturing, Utilities, and Energy. Jan also has some experience in Education, Construction, and Government and Administration.

Jan is most experienced in business areas like Human Resources, Project Management, and Sales. Jan also has some experience in Product Development, Information Technology, and Marketing.

Jan has recently worked in industries like Manufacturing and Energy.

Jan has recently worked in business areas like Human Resources, Project Management, and Strategy.

Jan holds a Bachelor in Environmental Process Engineering with a focus on Environmental Science from Van Hall Instituut and a Bachelor in Environmental Engineering (international degree program in Environmental Process Engineering) from Fachhochschule Wilhelmshaven.

Jan has 5 certificates. Among them, these include: Information Security Foundation ISO/IEC 27001, LEGO Serious Play Methods And Materials, and Leadership training.

Jan is immediately available part-time for suitable projects.

Daily Rate Distribution

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<€800 €800-1200 €1600+

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

Average rates for similar positions

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Daily rate avg. 860 €

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Median rate 740 €

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.