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E-Commerce · Shopware · B2B / B2C / D2C

E-Commerce Agencyfor more revenue

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E-commerce solutions with maximum performance are our thing. We build online shops for B2C, B2B and D2C with proven technologies and a fine sense for usability. Consulting, strategy, UX/UI design, development and integrations: all from a single source.

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4.921 Google4.922 Feedbax

E-commerce experience in numbers

50+
In-house plugins
<1s
Avg. server response time (Tideways)
12+
Years of experience
€500M+
Annual shop revenue managed
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E-Commerce from a single source

Six disciplines, one team. From platform to scale, we build your digital future together.

Platform development and management
Migration & Replatforming
Integrations & interfaces
B2B-E-Commerce
Conversion Optimization
Performance optimization and scaling
We build shops that grow sustainably, together with you.
Paul KalischCEO nextlevels
Paul Kalisch

What really matters in e-commerce

A successful online shop is never the result of good design alone. What counts is the interplay of performant shop technology, frictionless checkout flows and a platform that scales with your growth. That is exactly where we come in as an e-commerce agency: from Shopware and headless commerce to deep ERP and PIM integration.

We think about your shop from the customer and the revenue first: fast load times, a well-designed customer journey and cleanly measured conversion points. That turns visitors into returning customers and your shop into a reliable sales channel.

  • Performance & load time

    Every second of load time costs conversion. We optimise Core Web Vitals, caching and server response times measurably.

  • Scalable platform

    An open-source base like Shopware, with no vendor lock-in and full control over code, data and roadmap.

  • Connected systems

    ERP, PIM, payment and shipping cleanly linked, so orders run automatically instead of manually.

  • Conversion & data

    We measure what matters and optimise along real numbers instead of gut feeling.

Why Shopware?

Open platform. Full control. Grows with you.

API-first
Open, no vendor lock-in
B2B · B2C · D2C
One system for every model
Extensible
Plugins + custom development
Shopware partner
Hundreds of project hours
View references

Looking for Shopware expertise on site in the Rhineland? Our Shopware agency Düsseldorf supports projects in Düsseldorf, Cologne and across NRW – in person or remote.

Planning a B2B shop with Shopware? Read what the Shopware B2B Suite vs. Components decision means – features, costs and why the Suite is being phased out in 2026.

Want to have an online shop built? Our guide having an online shop built explains the process, costs and what matters with Shopware 6.

Partnership, not a black box

We build e-commerce from the customer back: clear discovery, iterative development and transparent communication. You're involved at every stage.

Discovery & strategy
Goals, audiences, scope and integrations are defined up front. That's the basis for a solid quote.
Concept & UX
Information architecture, user flows and checkout are planned before a single line of code.
Iterative development
We build in sprints and show working results early. You give feedback throughout, not just at the end.
Launch & quality
Testing, performance and security are part of it. Go-live is planned, not improvised.
Operations & evolution
After launch we stay on board: support, steady release cycles and continuous optimization.
Image about: Partnership, not a black box
Shopware technology
Medusa.js
Vue Storefront
Redis
PHP
Elasticsearch
Google Analytics
NextCMS PIM

Edge with nextlevels

With us you're always at the cutting edge of technology and benefit directly from our developer expertise. Together we analyze your shop, identify key areas and develop tailor-made solutions. Your goals and expectations are at the center of our work.

  1. Developers, not resellers

    Your shop is built by developers who really understand the code. We pass nothing to subcontractors.

  2. Shopware down to the detail

    Architecture, API integration and performance from hundreds of project hours.

  3. One team, every discipline

    Development, design and marketing come from one team that works without friction at the handoffs.

  4. Built for growth

    We build measurably for conversion, load time and revenue.

  5. Partner, not vendor

    We stay on after launch and keep developing your shop continuously.

Ready for your successful online shop?

Whether it's an improvement or a fresh start: a no-obligation conversation never hurt anyone.

Profile picture of Paul Kalisch, Executive Partner
Paul Kalisch
Executive Partner
info@next-levels.de +49 (0) 2161 539 71 60

E-Commerce Data & Insights

All posts
Cross-border e-commerce with Shopware 6: setting up a multi-country shop correctly

Cross-border e-commerce with Shopware 6: setting up a multi-country shop correctly

Cross-border expansion with Shopware 6 is no push of a button. From twelve real setups: when a new sales channel is enough, when a separate instance is necessary, which tax and payment traps DACH retailers overlook, and how to bring Varnish, hreflang and OSS together cleanly. As of May 2026.

BFSG-Checkliste für Shopware 6: So wird dein Online-Shop barrierefrei

BFSG-Checkliste für Shopware 6: So wird dein Online-Shop barrierefrei

Since June 2025, all B2C online shops must fulfil WCAG 2.1 Level AA - but many Shopware retailers are not yet compliant. The first waves of warnings are already underway and fines of up to €100,000 are imminent. This guide shows you step by step how to make your Shopware 6 shop BFSG-compliant.

Subscription commerce with Shopware: How recurring revenue supports your shop

Subscription commerce with Shopware: How recurring revenue supports your shop

Subscription commerce turns one-off purchases into predictable, recurring revenue. How this works with Shopware and how to start a subscription model.

MedusaJS: What the headless commerce framework 2026 can really do

MedusaJS: What the headless commerce framework 2026 can really do

MedusaJS crops up in almost every composable commerce discussion. But what is the framework really suitable for - and what is it not? A neutral overview of the architecture, workflow engine, TCO and realistic entry paths for decision-makers in the e-commerce SME sector.

All online shop services at a glance

Every specialization with its concrete deliverables — straight to the right page.

Platform Development and Management
Migration & Replatforming
Integrations & Interfaces
B2B E-Commerce
Conversion Optimization
Performance Optimization and Scaling

Shopware, Shopify or a custom build?

The right platform depends on your assortment, processes and growth goals. Here's a rough orientation to help you decide – we make the concrete recommendation after a look at your use case.

CriterionShopware 6ShopifyCustom build
Best forGrowing B2C & B2B brands with their own processesA fast start and standardised B2C shopsVery specific business models with no shop standard
CustomisabilityVery high, open source, full code accessLimited to the app ecosystem & theme boundariesMaximum – anything is possible, everything must be built
Running costsHosting & maintenance, no revenue shareMonthly fee plus, in part, transaction feesPure operating costs, but a higher initial investment
B2B featuresStrong, incl. native B2B componentsAdd-on via apps/PlusFreely implementable, but built entirely from scratch
Data & ownershipFull control, no vendor lock-inData in the Shopify cloud, platform lock-inCompletely in your hands

Market-typical orientation as of 2026 – not binding prices. Our focus is Shopware; in a first call we recommend the platform that truly fits you.

E-commerce – frequently asked questions

What does building an online shop with nextlevels cost?
It depends heavily on scope. A manageable shop based on Shopware typically starts in the low five-figure range, while complex B2B or headless projects with ERP and PIM interfaces sit above that. On top come running costs for hosting, licenses and maintenance as a separate line item. You get a concrete fixed-price offer after a short discovery in which we clarify requirements, interfaces and data volumes.
How long until my shop goes live?
It depends on the project type. A clearly scoped standard B2C shop usually goes live in 8 to 12 weeks; a migration or a B2B/headless project with ERP and PIM integration takes more like 4 to 6 months. The range depends on the number of interfaces, the complexity of your assortment and the data migration. We work in iterations: you see a working state early and give feedback, rather than only seeing the finished result at the end. You get the binding phase plan with a go-live date after discovery, not only after the project starts.
Which shop system do you recommend – Shopware, headless or something else?

Our focus is Shopware, because as an open-source system it is powerful, extensible and well established in the German mid-market. We recommend headless architectures (Shopware as backend, your own frontend) when you need maximum frontend freedom or special performance. We make the decision based on your requirements, not on principle – a simple shop doesn't need a headless setup.

More in our wiki: Headless Commerce

Can you migrate my existing shop?
Yes. We migrate existing shops in four clearly separated phases: technical audit, data migration (product data, customers, order history), parallel development of the new platform and cutover with active monitoring. We carry over your URL structure via a complete 301 redirect concept that we check against a live crawl of your old shop, so your SEO substance is preserved. We plan the cutover without a big bang and without a drop in revenue; after go-live we actively monitor rankings and error rates for several weeks and adjust as needed.
Do you support B2B, B2C and D2C equally?
Yes. In B2C, conversion, speed and a frictionless checkout matter most. In B2B, requirements such as customer-specific price lists, tiered pricing, order approvals, quotation features and ERP integration come into play. We support D2C brands from brand staging to the logistics interface. We build the shop around your business model, not the other way round.
How do you ensure performance and scalability?
Performance isn't an afterthought for us but part of the architecture. We optimize for good Core Web Vitals, use caching, a CDN and clean database indexes, and test behavior under load. That keeps your shop fast and stable even during load peaks such as sales campaigns or Black Friday.
What about data protection, security and payment processing?
We build shops GDPR-compliant and integrate payments via certified payment providers, so no sensitive card data sits on your server. Updates, secure configuration and a roles-and-permissions concept are standard for us. In e-commerce, security isn't an optional add-on but a prerequisite for trust and conversion.
Who owns the shop – does vendor lock-in arise?
You own everything: code, configuration, data and content. Because we build on open-source technology like Shopware, you're not tied to proprietary systems and could in principle hand operations to another team. We document cleanly – vendor lock-in is not our business model.
What does an e-commerce agency do for B2B & B2C?
An e-commerce agency plans, builds and runs online shops across the full lifecycle – from strategy and UX through technical implementation to operations and growth. We cover B2C and B2B from one team: in B2C, conversion, speed and a frictionless checkout matter most; in B2B, customer-specific pricing, tiered prices, order approvals and ERP integration come into play. So you get shop, interfaces and marketing from a single source instead of from three vendors.
Are you a Shopware agency or an agency for online shops in general?
Both. Our focus is Shopware because it is established, open and extensible in the German mid-market. As an agency for online shops, though, we think platform-neutral: if a headless setup or a custom build fits your business model better, we say so – and build it. We make the platform recommendation after a look at your assortment, processes and growth goals, not on principle.