Maniac Developer Gmbh

What Maniac Developer Gmbh does

Maniac Developer GmbH is a privately held German software company headquartered in Achern, Baden-Württemberg, that develops and supports the maniacSeller product line of e-commerce connectors. Operating as a 1-10 employee GmbH managed by Marco Schauer, the company specializes in bridging ERP systems (SelectLine OEM, Sage 100, Sage DMO) with Shopware and Shopify storefronts, plus connected marketplaces (Amazon, eBay, Rakuten) and shipping carriers (DHL, DPD, GLS, UPS) through a single Windows desktop application built on .NET Framework 4.8.

The core product is maniacSeller, a bidirectional integration middleware that synchronizes master data (articles, customers, images, PDFs, prices, variants), imports shop orders into the ERP, manages inventory across channels, and generates shipping labels. Modular add-ons extend functionality to multi-channel marketplace connectivity (via magnalister), customer-specific pricing (via Viosys B2B plugins), product variants, and Shopware property/filter management. The next-generation maniacSeller Gen2 platform supports Shopware 6.5+, and maniacSeller.cloud offers a cloud-hosted version for Sage SDMO. The maniac Academy certification program trains and authorizes resellers and implementation partners.

The business model is subscription-based software rental with monthly advance payments and a 12-month minimum contract term, supplemented by separately billed professional services for implementation, training, and configuration. Customer acquisition is sales-led, combining direct sales via live online demos, an organic SEO-driven content marketing engine (website, blog, video gallery, knowledge base), and a partner network anchored on SelectLine resellers and magnalister. The company claims experience from nearly 400 customer projects, with a target market of German-speaking SMBs in the DACH region.

Name

Maniac Developer Gmbh

Legal name

maniac developer GmbH

Website

https://maniacdev.de

Company type

Private

Founded year

2018

Operating status

Operating

Headcount range

1–10 employees

Short description

Maniac Developer GmbH develops maniacSeller, a Windows desktop middleware connecting SelectLine and Sage 100 ERP systems to Shopware, Shopify, marketplaces, and shipping carriers for German-speaking SMB online retailers.

Ownership category

akta.pro rank

Product category

ERP E-Commerce Middleware

NAICS

Software Publishers (5132)

akta.pro primary industry

Software/SaaS Subscriptions (Consumer & Prosumer) (CRAFAIAB)

Keywords

• ERP e-commerce middleware
• Shopware connector
• Sage 100 integration
• Marketplace integration software
• Shipping label automation

Headquarters

HQ city

Achern

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Marketing or Sales, Operations, Others

Revenue model

1. Software Subscription / Rental (Subskription): maniacSeller is offered as a monthly software rental/subscription with a minimum contract term of 12 months. Payment is due monthly in advance via SEPA direct debit. Annual price adjustments may be applied based on the German consumer price index. The subscription model grants non-exclusive usage rights for the contracted period, with the license revocable upon termination.
2. Professional Services (Implementation & Support): Optional implementation, configuration, and training services are offered as separate paid engagements. Installation, configuration assistance, and product training are not included in the base subscription and are charged separately.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels9 records

Core offering

Maniac Developer GmbH develops and sells the maniacSeller software, a Windows desktop middleware application that bidirectionally connects ERP systems (SelectLine, Sage 100, Sage DMO) with Shopware and Shopify online stores, multi-channel marketplaces (Amazon, eBay, Rakuten via magnalister), and shipping carriers (DHL, DPD, GLS, UPS). The product automates master data synchronization, order import, inventory management, variant handling, and shipping label generation for German-speaking SMB retailers. Revenue is generated through monthly software subscriptions (12-month minimum) and separately billed professional implementation, configuration, and training services.

Product overview

Maniac Developer GmbH offers the maniacSeller product line - a unified e-commerce middleware platform connecting ERP systems (SelectLine, Sage 100, Sage DMO) with Shopware and Shopify online shops. The core maniacSeller platform handles bidirectional master data synchronization, order processing, inventory management, and pricing. Add-on modules extend functionality for multi-channel marketplaces (Amazon, eBay via magnalister), shipping carriers (DHL, DPD, GLS, UPS), product variants, and customer-specific pricing. The company also provides the next-generation maniacSeller Gen2 platform for Shopware 6.5+, the cloud-hosted maniacSeller.cloud variant, and the maniac Academy certification program.

Differentiator

Problem solved

Functional benefit

Brands

• maniacSeller: Main product brand - a Shopware and Shopify web shop interface connecting ERP systems (SelectLine, Sage 100) with e-commerce platforms, including multi-channel (Amazon, eBay) and shipping integration (DHL, DPD, GLS, UPS).

Products and services

• maniacSeller Primary e-commerce middleware product connecting SelectLine, Sage 100, and Sage DMO ERP systems with Shopware and Shopify storefronts, providing bidirectional master data sync, order automation, inventory management, and pricing.
• maniacSeller Shopware Connector Core Shopware interface module synchronizing articles, variants, customers, images, PDFs, prices, categories, and orders between SelectLine/Sage ERP and Shopware storefronts.
• maniacSeller Shopify Connector Shopify integration module supporting article uploads including variants, customer synchronization, and inventory sync via Shopify API.
• maniacSeller MultiChannelConnector Add-on module enabling multi-channel marketplace order import, inventory sync, and shipping data exchange across Amazon, eBay, Rakuten, Yatego, and real.de via magnalister.
• maniacSeller Versandschnittstelle (Shipping Interface) Shipping interface module connecting ERP systems with DHL, DPD, GLS, UPS and other carriers, automatically generating shipping labels, importing tracking codes, and synchronizing shipment status.
• maniacSeller.cloud Cloud-hosted deployment of the maniacSeller interface targeting Sage SDMO customers, presented through the Sage Techpartner Program.
• maniacSeller Gen2 (maniacConnectGen2) Next-generation platform version supporting Shopware 6.5 and later, with enhanced configuration interface, replenishment time field mapping, custom SQL queries for shop customer identification, and modern category synchronization.
• maniac Academy Certification Program Online training and certification program that qualifies individuals and companies as maniacSeller Professional partners authorized to resell, install, and configure the Shopware-SelectLine and shipping interfaces.

Quantifiable outcome

• Nearly 400 successful customer projects completed
• +3 more outcomes

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration17 records

Feature8 records

Partnerships

Four partnerships are on record, tiered core and minor.

• SelectLine (OEM / Software Partner)coreTechnology or IntegrationSelectLine is the OEM software vendor whose ERP systems (SelectLine Warenwirtschaft) maniacSeller connects to Shopware and Shopify. Maniac Developer GmbH is a certified SelectLine technology partner. The partnership includes joint webinars (SelectLine Schweiz co-hosted sessions), co-branded marketing, and cross-referrals through the SelectLine partner network. SelectLine officially endorses maniacSeller as a validated Shopware and Shopify connector for SelectLine users.
• magnalistercoreTechnology or Integrationmagnalister is a marketplace integration plugin for Shopware that enables connection to amazon, eBay, Rakuten, Yatego, Kaufland, OTTO, and other marketplaces. maniacSeller recommends magnalister as the preferred multi-channel solution and integrates seamlessly with it for order import and inventory sync. A joint free 30-day trial is promoted on the maniacdev website, with a dedicated partner link (magnalister.com/freetest/partner=maniacdev).
• Sage (Techpartner)coreTechnology or IntegrationSage is the vendor of Sage 100 and Sage DMO (SDMO) ERP systems. Maniac Developer GmbH participates in the Sage Techpartner Program, as evidenced by a Sage Techpartner Roundtable video showcasing maniacSeller.cloud for Sage SDMO. The partnership provides technology validation and co-marketing exposure within the Sage partner ecosystem.
• SelectLine Schweiz (SelectLine Switzerland)minorChannel Partner/ Reseller/ DistributorSelectLine Schweiz (Swiss SelectLine reseller) partnered with Maniac Developer GmbH to co-host a webinar on connecting Shopware with SelectLine via maniacSeller. This partnership extends maniacSeller's geographic reach into the Swiss market through an established local SelectLine partner.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Linnworks: Linnworks is an order, inventory, and marketplace management platform with integrations to Shopify, Amazon, eBay, and major shipping carriers. Like maniacSeller, it is sold as a recurring subscription and centralizes multi-channel commerce operations for SMB retailers.
• ChannelEngine: ChannelEngine is a marketplace integration platform with deep support for Amazon, eBay, Kaufland, and bol. maniacSeller layers marketplace connectivity on top of magnalister; ChannelEngine is a direct, more enterprise-grade alternative for the marketplace sync portion of the maniacSeller stack.
• Pickware: Pickware is the Shopware-incubated ERP bridge connecting Shopware to merchandise management, inventory and accounting. It competes head-on with maniacSeller in the SelectLine/Shopware SMB integration niche and benefits from a tighter Shopware partnership.
• Pipe17: Pipe17 is a cloud-native order operations platform that connects ERP, ecommerce, marketplaces, and 3PLs. It targets the same ERP-to-shop integration problem maniacSeller solves, but as a modern API-first SaaS rather than a Windows desktop application.
• Webgility: Webgility provides e-commerce accounting and inventory automation connecting QuickBooks, Shopify, Amazon, eBay and shippers. It mirrors maniacSeller's ERP-plus-marketplace-plus-shipping positioning, although focused on the US SMB market and QuickBooks rather than SelectLine/Sage.

Emerging players

• Orderhive: Orderhive is an order and inventory management platform with multichannel and shipping integrations for Shopify, Amazon, eBay, and major carriers. It targets the SMB multichannel retailer segment that maniacSeller serves, offering a more lightweight cloud alternative.

Regional players

• PlentyONE: PlentyONE (formerly Plentymarkets) is a German-headquartered multichannel commerce platform with built-in ERP, marketplace and shipping integrations. It overlaps maniacSeller's target market (DACH SMB retailers) and offers first-party integration capabilities that compete with the maniacSeller middleware layer.
• novomind: novomind is a Hamburg-based provider of e-commerce, PIM, and customer service software serving enterprise and mid-market brands in the DACH region. It operates in the same German e-commerce software ecosystem as maniacSeller, though at a larger scale and with a broader product portfolio.

Broad incumbents

• nChannel: nChannel was an ERP-ecommerce integration platform (acquired by BigCommerce) that synced orders, inventory and shipments between ERPs and storefronts. It targets the same integration use case maniacSeller addresses, now embedded as part of the BigCommerce channel-management suite.
• Brightpearl: Brightpearl is a retail-first ERP that natively connects to Shopify, Amazon, eBay, and shipping carriers. It competes with the broader ERP-plus-ecommerce integration workflow maniacSeller enables, but as a full ERP replacement rather than a connector middleware.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/maniacdeveloper

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Maniac Developer Gmbh