Our goal is to stabilize the grid and scale up clean energy use

We monitor the grid for clean energy and low prices, so people can use electricity when it’s cheaper and cleaner.

We build tools that help to stabilize the grid, so there's more room for clean energy like solar and wind.

We're hiring!

Meet the team

Erik de Bruijn

Erik de Bruijn

Co-founder and CTO

Driving his electric vehicle since 2013 and harvesting his own solar power since 2015, he wanted to be able to charge at the best times possible. Because there was no application available for this, he developed one himself. Much later, together with Jankees van Woezik, he founded Stekker.app and developed the idea into a service, so anyone can use it. With their company, the primary goal isn’t profits, but to maximize our positive impact. But first we start small and create a great, compelling service that adds value. We want to ensure it’s attractive for anyone to use, not just technology minded people.”

Jankees van Woezik

Jankees van Woezik

Co-founder and CEO

I made my first website in 1998 and got into a trajectory to start multiple businesses. Meanwhile I've always freelanced as a full stack developer and after about 10 years of freelancing I ended up at Ultimaker where I met Erik de Bruijn. From the first moment we met we connected on multiple levels which led to us founding Stekker in 2019.

My passion is to work on products and services that are meaningful to people and our society at large. I really enjoy solving such puzzles piece by piece. I want to love what I do and do what I love, work included.

Our mission is really important to me. I'm really grateful that we are able to give people the tools to save emissions and make better use of renewable energy.

Eric-Paul Lecluse

Eric-Paul Lecluse


Eric-Paul (or "EP" for short) loves unconventional solutions for everyday problems, whether it's by writing code, building physical structures or changing the way we work. As a developer he's been making apps for the web and mobile devices since the early 2000's.

In 2020 he joined Stekker.app as a co-owner, where his focus is on development and improving company processes.

"This is such a rewarding area to be working on. Everybody involved wins; the EV driver, the energy suppliers, the network stability and above all, the environment!"

Revi Körnmann

Revi Körnmann


As a user experience designer I deliver ready-to-build digital designs for responsive web, iOS and Android. With 15+ yrs experience in gathering user needs, aligning with stakeholders and refining with developers I aim to deliver user centered designs that meet the needs of all parties involved.

Early 2021 I joined Stekker.app.

Bob Forma

Senior software developer

Bob is a passionate software engineer and has 15+ years of experience developing hand crafted software products for many different companies in various industries.

He loves taking an agile approach with test driven development, delivering quickly, iteratively and learning along the way.With a love for event sourcing,

Bob is the co-author of Sequent, an opinionated CQRS & event sourcing framework for Ruby (and Rails).

Bob joined Stekker in 2022 as a software engineer.

Martijn Versluis

Software developer

With 12+ years experience in web development I am passionate about craftsmanship, TDD/BDD, Scrum, Ruby/Rails, Elixir/Phoenix, JavaScript and more.

Matthijs van der Boon

AI Developer

Matthijs' AI-journey began during his Master's at ETH Zurich, Switzerland, where he focused on the practical applications of AI. Matthijs explored how AI could solve real-world problems, from computer vision to controlling robots.

Upon returning to the Netherlands, Matthijs met Erik de Bruijn, whose contagious enthusiasm for Stekker caught his attention. Despite being the newest and most junior addition to the team, he says he’s inspired every day by the smart and skilled colleagues around him.

“The team's dedication to our mission and the collaborative atmosphere is truly motivating. Stekker's mission to make a positive impact aligns perfectly with my passion for using AI to drive the energy transition,” Matthijs says. “I am excited to use my skills to refine our products and services by incorporating smart algorithms and machine learning.”

Daan Keppel


Daan Keppel is a versatile visual designer who started working for Stekker in 2023. Daan is a spontaneous, enthusiastic, humorous and somewhat nerdy team player with a green heart. She has worked in the online field since 1996. 

Daan considers herself a no-nonsense, practical designer who likes to create clean, clear, user-centered designs. Not afraid of hardcore production work while enjoying running, nature, her dog, visiting art/museums and painting. 

“I love wholesome interactions with colleagues,” she says. “A common goal, shared information, lunch walks, the latest trends about design / tech / tools, good coffee and a healthy lunch.”

Just like everyone here at Stekker, Daan hates inefficient meetings - and like some other colleagues, prefers to stand during them. 

Thys Roes

Digital editor

Thys was pulled from the world of journalism, where Thys had gotten frustrated by the inability to meaningfully help the energy transition. Now, through Stekker, he combines his talent for writing, digital content creation and his interests in technology and energy.

Before he started working in TV and digital news in New York and Amsterdam, he enjoyed a stint as a junior developer in his teens in the 90s. Surrounded by his journalism colleagues, he's the tech nerd. Surrounded by tech nerds, he's the journalist.

Thys dipped his toes into Stekker as a freelance copywriter 2022 and started working as Master of Copy and digital editor in 2023. It's his responsibility to clearly broadcast the Stekker story to the world.

Looking to join our team?

We have big plans, which require us te expand our team with new talent. If you think we're missing something, or if you are interested in finding out about our current openings, check out our job vacancies here!