HubSpot
Custom HubSpot websites for businesses that don't want to run their website separately from their marketing. A platform where CRM data, content, and conversions all come together.
HubSpot CMS Agency
HubSpot CMS is more than just a content management system. It connects your website directly to your CRM, your campaigns, and your data. We use it to build websites that not only look great but also show you what works and what doesn't.
Website and CRM
on a single platform
Custom Modules Instead of
Theme Compromises
Measurable performance—not just a feeling
When HubSpot CMS Is the Right Choice
HubSpot CMS is a good fit for companies that don’t want to run their website in isolation. If your marketing team works with forms, email campaigns, and lead scoring and wants to use this data directly on the website, HubSpot is the logical platform. Instead of connecting different tools via plugins, HubSpot brings everything together on a single platform: website, CRM, and marketing automation. We’ll give you honest advice on whether HubSpot CMS is the right fit for your project, or whether WordPress or TYPO3 would be a better choice.
How Your Team Works with HubSpot
After launch, your team will manage content through a backend tailored to your workflow. We develop custom modules with clearly defined fields: your editorial team enters content, not layouts. Practical defaults, limited options, and clear naming conventions ensure that pages remain consistent even without developers. At the same time, the system remains flexible enough to add new modules or page sections as your requirements change.
From corporate websites to landing pages to content portals: what we develop with HubSpot CMS is tailored to what your marketing team actually needs. Every project starts with your goals, not with the platform’s features.
Company Websites
Custom corporate websites with a well-thought-out information architecture, modular design, and direct CRM integration. Every page sends data to your HubSpot CRM, so you know which content is effective.
Landing Pages
Conversion-optimized landing pages for Google Ads, social media campaigns, or targeted marketing initiatives. Modular in design, with custom tracking setups and forms that feed directly into your HubSpot workflows.
Career Pages
Career portals that offer more than just job listings. Employer branding, location pages, and team profiles—all built using custom modules that your HR team can update on its own.
Content Portals
Blogs and knowledge portals with SEO-optimized templates, category and tag structures, and a content management system that makes publishing easy. HubSpot also provides integrated SEO recommendations and topic clustering.
Accessible Websites
The Accessibility Enhancement Act (BFSG) has been in effect since June 2025. We develop HubSpot websites in accordance with WCAG 2.1 guidelines, using semantic HTML, keyboard navigation, and a structure that works with screen readers.
These companies know how we work
We develop custom modules in HubL, HubSpot’s template language. Each module includes exactly the fields your team needs: validations, placeholders, help text, and useful default values. No cluttered themes, no page builders. The layout is defined in the code; your team simply fills in the content. This ensures there are no inconsistencies, even when different people maintain the pages. If a page contains multiple instances of the same module, HubSpot loads CSS and JavaScript only once. This keeps performance stable even on complex pages. Modules can be expanded at any time without affecting existing content. The result: a website that remains visually consistent and grows in a technically clean way, no matter how often your requirements change. This is what sets a HubSpot CMS agency apart from a template provider.
„seitenweise is one of the few agencies that has managed to completely exceed our expectations. Performance, quality, reliability, timing—everything is top-notch! Highly recommended.“
Florian Nack
myflexbox
„The team at seitenweise consists of our graphic design and web development professionals. Whenever we need help, they’re always there for us—quickly and reliably. Thank you for the great collaboration!“
Sandra Meder
Sage
„What particularly impresses us about Seitenweise is not only its technical expertise, but also its proactive approach.“
Dirk Bockelmann
DFT
„Working with an agency requires good ideas, cutting-edge technology, and clear budgets with no surprises. But the personal chemistry has to be right, too. With seitenweise, everything was just right. It was really fun.“
Mathias Schwaben
Intervideo
„seitenweise is one of the few agencies that has managed to completely exceed our expectations. Performance, quality, reliability, timing—everything is top-notch! Highly recommended.“
Florian Nack
myflexbox
„The team at seitenweise consists of our graphic design and web development professionals. Whenever we need help, they’re always there for us—quickly and reliably. Thank you for the great collaboration!“
Sandra Meder
Sage
„What particularly impresses us about Seitenweise is not only its technical expertise, but also its proactive approach.“
Dirk Bockelmann
DFT
„Working with an agency requires good ideas, cutting-edge technology, and clear budgets with no surprises. But the personal chemistry has to be right, too. With seitenweise, everything was just right. It was really fun.“
Mathias Schwaben
Intervideo
Here's how your HubSpot website is created
Requirements and Concept
Together, we’ll determine what your HubSpot website should accomplish: target audiences, CRM integration, forms, personalization, and integrations. This will result in a concept that includes the site structure, module architecture, and technical framework. During this phase, we’ll also determine which HubSpot license you need and where custom modules are required. This way, both sides know exactly what the project entails from the very beginning.
Design and Prototype
We develop the visual design based on the concept. You’ll see drafts for the most important page types, provide feedback, and we’ll iterate until we’re satisfied with the result. From the very beginning, we’ll consider how the design will be translated into HubSpot modules. What content can your team create on their own later on, and where do fixed structures make more sense? This saves time during development.
Development and Module Setup
We implement the design using custom modules written in HubL, HTML, CSS, and JavaScript. Each module has clearly defined fields, validations, and default values. If needed, we develop serverless functions or integrate third-party systems via APIs. We configure the CRM integration so that forms, tracking, and lead scoring work from day one.
Testing and Launch
Before the site goes live, we’ll test it on a staging environment in HubSpot: functionality, performance, responsiveness, and accessibility. Your team will receive an introduction to the modules and will be able to enter initial content on their own. Once everything is set up and you give the green light, the site will go live. After that, we’ll remain available to assist with any enhancements, new modules, or new requirements.
Projects
Frequently
Asked
Questions
Marketing
meets website
We'll turn your website into a data source
seitenweise is a digital agency based in Bielefeld, founded in 1999. With over 100 clients and more than 500 projects, we’ve proven that we build long-term partnerships, not just one-off projects. Our focus at HubSpot is on websites with custom modules, CRM integration, and measurable performance. We also offer strategy, UX/UI design, web development, SEO, and video—all from a single source. That means: streamlined processes, honest advice, and a team that knows your project from the very beginning—not just the ticket number.
Marcel and André are your points of contact at seitenweise. They'll be happy to answer any questions you have about HubSpot.
Whether it's a new HubSpot website, a migration, or an expansion of your existing setup: tell us where you're at and what you're planning. No strings attached—it'll take just 30 minutes.