The Home of Integrations
Where trust is part of our culture
and reliable integrations are what we ship every day.
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Our Values
Our vision and mission inspire us to shape the future of enterprise software integration, and our values reflect this drive.
We are driven by a growth-mindset.
We take initiative and act with purpose, driving projects forward independently. Our ambition pushes us to tackle challenges head-on and seize every opportunity to grow.
We strive for excellence.
We set high standards for ourselves and strive to outperform expectations internally and externally. Committed to quality and impact, we deliver work that sets the benchmark for success.
We are courageous explorers.
We take bold steps into the unknown, confidently exploring new ideas and possibilities. We experiment, fail fast, and iterate, knowing that innovation is built through curiosity and action.
We live radical candor.
We believe in caring personally while challenging directly. By balancing honest and open communication with empathy, we foster a team culture where trust thrives, and everyone feels empowered to grow.
Our Founders
Driven by product thinking
At Maesn, product comes first.
We build integrations the way product lovers would: with deep thinking, high standards, and a constant focus on what developers truly need. Our goal is not just to make systems connect, but to make integrations reliable, elegant, and effortless - because great integration quality directly shapes product value.
We challenge details, question complexity, and put ourselves in our customers’ shoes every day to create solutions that feel right, work sustainably, and move products closer to perfection.
Maesn at a Glance
Maesn is the Unified API for ERP and Accounting integrations. We enable leading software teams to offer integrations across their customers’ software landscapes - helping them win more customers while saving months of engineering effort.
Düsseldorf & Remote
Remote and with our office in Düsseldorf, we’re driving Maesn forward at the heart of innovation.
More than 15 Team Members
Over 15 talented team members are shaping the future of integration with us.
> 1/3 Women
We’re proud of our team’s diversity but know there’s still room to grow.
6 Nationalities
Our team combines perspectives from 6 nationalities from all over EU, fueling our success.
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CEO
Dr. Themo Voswinckel
Before founding Maesn, Themo built deep expertise in enterprise software integration through several years in strategy consulting, leading multi-million-euro projects in software landscape design, system selection, and implementation for complex mid-market and enterprise environments.
Alongside his operational work, he earned a Dr.-Ing. and a master’s degree in engineering, with a focus on digitization and the transformation of ERP into SaaS models.
Across numerous projects, he recognized that even the most modern software often lacks the integration capabilities required in real customer environments. This insight led him to co-found Maesn - enabling software companies to become natively compatible with their customers’ tech stacks.
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Marius Pohle
Marius started his career in enterprise software as a Product Manager at one of Germany’s largest software companies, where he worked on software migration projects and led product and development teams focused on data, integrations, pipelines, and APIs - often the less visible but business-critical layers of software. He co-founded Maesn with the ambition to build a company that solves a structural problem for modern software teams and creates lasting value for customers. At Maesn, he leads customer relationships, sales, partnerships, and customer success, with a strong ability to understand what customers truly need, shape the right solution, and build trust far beyond a single deal. He is driven by helping software teams grow across Europe and making integration a strategic advantage.
CTO
Lennart Svensson
Lennart started programming at the age of 9. Subsequently, he obtained a master's degree in computer science from Uppsala University, including exchange studies at the National University of Singapore and the University of Zürich. During his 18 years in the software industry he has worked on diverse topics such as development of smartphone operating systems, development of an identity and access management platform for more than a million users, developing high-performance calculation jobs for the Norwegian pension system, leading strategic technology programs and M&A processes and acting as a technology advisor to senior management.
He has held titles such as Software Engineer, Lead Solution Architect, Chief Architect and Enterprise Architect. In 2023, Lennart joined Maesn as the CTO and later became a co-founder. He is passionate about building a product that takes the effort out of system integration and building a European start-up.