Theo van der Sluijs
25+ years IT | 4+ years Sustainability

Welcome, my name is

Theo van der Sluijs

Manager Building Sustainability | Technical Strategic Thinker | Sustainability Advisor

With a background in software development and product management, I combine innovation with sustainability. At Zeeuwind, I lead sustainability projects for homes and SMEs, coordinate neighborhood-based approaches, and research innovative solutions such as home batteries and mini heat networks. I describe myself as a bridge builder between technology, strategy, and societal impact.

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Work Experience

Professional Career

From software development to sustainability - a journey of more than 25 years

Manager Building Sustainability

Sustainability
Zeeuwind
2025 - present

At Zeeuwind, I lead the sustainability efforts for homes and SME businesses. I develop and coordinate neighborhood-based approaches and sustainability projects, collaborate with municipalities and external parties, and ensure a future-proof digital platform for homeowners and energy coaches. Additionally, I research and implement innovative solutions such as home batteries, EMS, and mini heat networks. My work revolves around collaboration and practical solutions, making sustainability achievable and accessible for everyone.

#Sustainable project management#Stakeholder management#Innovation in energy transition#Strategic and operational leadership#Digital platform development

Senior Product Owner

Maxxton
2023 - 2025

As Product Owner at Maxxton, I lead a team of 18 backend and frontend developers, designers, and QA professionals in India. I regularly visit India and maintain daily contact to ensure smooth communication and efficient workflows. I collaborate with clients such as Roompot, Landal, and Farmcamps, providing tailored solutions. My focus is on developing secure, well-tested financial modules that streamline operations and enhance user experience.

#Project Management#Team Leadership#Software Development#Agile Methodologies#Product Owner#DAC7 legislation
2022 - present

Owner

TS Intermedia

1996 - 2022

As owner of TS Intermedia since 1996, I bring extensive IT and development experience in interim roles at Product Owner/Manager, Team/Tech Lead, Manager, and CTO levels. My expertise spans software development, hardware configuration, and network environments. I excel at leading large international teams and delivering secure, reliable, and efficient solutions. I help companies optimize their IT infrastructure and processes, ensuring robust solutions and security across all aspects of their IT operations.

#Business Analysis#Project Management#Project Planning#Product Owner#Team Leadership

Product Owner

PAY.
2022 - 2023

At Pay, I was Product Manager/Product Owner, leading a team of 8 developers. My role involved creating robust and secure payment processing software. With skills in analytical thinking, business analysis, agile methodologies, and project planning, I ensured our solutions met high standards. I collaborated with major banks and organizations such as iDeal, IN3, and ING to deliver reliable and secure payment systems.

#Project Management#Project Planning#Product Owner#Analytical Skills#Business Analysis#Team Leadership#Agile Methodologies

Project Manager/Operational Lead

XSARUS
2021 - 2022

As Project Manager/Operational Lead at XSARUS, I led a team of 8 developers to build secure webshops for major fashion brands like Bomont and Nora. Specializing in Magento e-commerce, I fostered collaboration, innovation, and agile methodologies to deliver robust online shopping experiences. I ensured projects met deadlines, budgets, and quality expectations while maintaining clear client communication.

#Team Leadership#Project Management#Operations Management#Agile Methodologies#Product Owner

CTO/IT Development Manager

Viterra B.V.
2017 - 2021

At Viterra/Glencore, I served as acting CTO and IT Development Manager, leading 150 developers in India and 50 in the Netherlands, including Product Owners and testers. With help from Cognizant, we migrated critical software from PowerBuilder to Java/C# and Angular, delivering robust and efficient solutions. My role included strategic planning, resource allocation, and fostering a culture of innovation and continuous improvement.

#IT Management#Project Management#Project Planning#IT Operations#Team Leadership#Software Development#Agile Methodologies
2014 - 2017

As CTO/IT and Software Development Manager at eHealth Ventures Group, I advanced the company by defining the technological roadmap, driving innovation, and overseeing software development teams in the Netherlands and Curacao. My efforts ensured the delivery of high-quality e-health solutions, enabling consumers to make informed decisions.

#IT Operations#IT Management#Team Leadership#Project Management#Agile Methodologies#Product Owner

CTO/Head Tech

Bax-Music
2011 - 2014

As CTO at Bax-Music, a company aiming to become Europe's largest eCommerce music store, I played a crucial role in its growth. Under my leadership, our development team grew from 3 to 35 professionals. We migrated from a monolithic system to a microservice-based environment, improving scalability and performance. My strategic vision and focus on innovation were recognized by industry peers such as Coolblue. At Bax-Music, I emphasized agile methodologies, continuous improvement, and collaboration, leading to significant contributions to our success as a leading European eCommerce music store.

#IT Management#Team Leadership#Project Management#Agile Methodologies#Product Owner

Various (consultancy) roles

Various

2001 - 2011
  • IT Adviesgroep: VB/ASP Classic Developer
  • Zeelandnet: VB Developer / Team Lead
  • Resulstants-e: Lotus Notes Developer
  • Mulix ICT: PHP Developer
  • NL4Business: SAP/ABAP Developer
  • Univer: PHP Developer / Manager
#Developer#Consultant#VB#ABAP#PHP
Education

Education & Certifications

The Hague University/TH Rijswijk

VIA, Design and Development of Interaction

1996 - 2001

MEAO Oude Tonge

Computer Science & Business Administration

1991 - 1996

Willem van Oranje

MAVO (Secondary Education)

1987 - 1991

Certifications

Professional Certificates

SME Energy Coach Certificate

Duurzaam Bouwloket Energy Coach

Professional Scrum Master I (PSM I)

Professional Scrum Product Owner I (PSPO I)

Professional Scrum Product Owner II (PSPO II)

NUCLEAR01x: Understanding Nuclear Energy

Senior Executive Management

Volunteer Work

Volunteer Work

Member / Website Administrator

Lokale Partij Borsele

2024 - present

Chairman

Werkgroep Duurzaam Nisse

2022 - present

Board Member

Boekenmarkt Nisse

2022 - present

Chairman

Stichting dorpsraad Nisse

2020 - 2026

Founder / Chairman

Samenwerkende Dorpsraden Borsele

2022 - 2023

(Interim) Chairman

Rommelmarkt Nisse (140 volunteers)

2022 - 2023

Skills

Skills & Expertise

Technical

DockerPythonRaspberry PiHome AutomationSQLPostgreSQLDebianBash

Professional

Project ManagementTeam LeadershipProduct OwnerAgile MethodologiesIT OperationsSustainability

Languages

DutchC2
EnglishC1
GermanB1
Contact

Get In Touch

Interested in collaboration or just a conversation about sustainability and technology?