Web Development Frankfurt: Web Apps, Modules & Integrations

mindmelt has been building web applications, client portals, bespoke CMS modules and third-party integrations for mid-sized businesses since 2002. We work on a fixed-price project basis - and you own the source code when we're done. Need to connect your website or shop to your ERP or CRM? We handle that through our ERP integration service.

Custom Web Development vs. Website Builds

Most web projects are website builds: install a CMS, adapt a template, add content. We do that too. Custom web development starts where templates run out - when a product configurator needs to calculate 2,000 variants in real time, a customer portal has to pull data from multiple sources, or an internal tool needs to replace the spreadsheet for good.

For work like that, we write our own code, our own modules and our own interfaces. No plugin chains. No workarounds. Every project is documented, tested and handed over with full source code.

Our stack is PHP, MySQL and REST APIs, with Python for automation and Node.js for real-time applications.

Four areas we develop in

We'll work out which one fits your brief in an initial technical conversation.

Third-Party Integrations

REST APIs connecting to payment providers, booking systems, marketing tools and other services - with two-way data exchange, error handling and full documentation. For ERP and CRM connections, see the ERP interface.

Custom CMS-Module

Bespoke backend modules for your CMS - product catalogues, event calendars, staff directories, form builders. We build them when standard CMS functionality doesn't cut it.

Web Applications

Browser-based tools built for internal use - customer portals, calculation tools, dashboards. They replace spreadsheets and Access databases for good.

Automation

Processes that take too long to run manually - data imports, exports, reports, notifications. We build them using Python scripts, cron jobs and webhooks. See what that looks like with AI in the mindmelt AI case studies.

Project-Based Development

Hiring a developer means a permanent contract, an onboarding process and hardware costs - often for a project that runs three months. With mindmelt, you get web development on a project basis: fixed price, defined scope and documented code.

After launch, you keep a single point of contact who knows the codebase and can take on any further work.

Common Integration Scenarios

CRM and ERP Connectivity

Contact forms that write directly to your CRM. Product data, pricing and stock levels pulled from your ERP and displayed on your website. For a full breakdown of scenarios, workflow and the boundary with your ERP partner, see ERP Interface for Website and Shop.

Customer Portal

A login area where your clients view invoices, track orders and download documents. Data is served via API from your existing system.

Internal Tools

Calculators, quote configurators and dashboards - built as web applications to replace anything currently living in Excel.

Custom Online Shop Within Your CMS

We build bespoke online shops within the same CMS as your website. That makes sense when an off-the-shelf platform can only handle B2B pricing, configurators or approval workflows through add-ons. Product management, basket, customer account and order processing all become custom modules - and you own the code.

We also work with Shopify, WooCommerce and Shopware. To see which approach suits your project, visit Commission an Online Shop.

45+

API Projects
Delivered

Years of
Development Expertise

80+

Bespoke
CMS Modules

100%

The Code
Belongs to You

When it needs to be solid

We do not believe in magic.

Only in craftsmanship

that looks the part.

Web development & APIs

What web development changes day to day

An ERP connection for 48,000 items and the online shop for the RMV fan shop.

Connector wholesale

AI and ERP integration for a distributor with 48,000 items

+ Excerpt from our work together

Initial situation:: With 48,000 items, customers could barely find stock levels and matching variants on their own.
Solution:: Stock display and configurator connected directly to the ERP.
For customers:: Customers see availability and matching items without asking.
For the company:: Fewer phone calls and emails about stock and variants.
Key figure:: Around 48,000 items in the stock and configurator system; availability checks used to take about 10 minutes, target: a few seconds

Web DevelopmentERP Integration

Public transport · Rhine-Main

Online shop for the RMV fan shop

+ Excerpt from our work together

Initial situation:: Without a shop of its own, fan merchandise was ordered and recorded by hand.
Solution:: WooCommerce shop in RMV design with automated order processing and PayPal.
For passengers:: Passengers and fans order their items directly online.
For RMV:: No more manual order entry.
Key figure:: 0 → 340 automated orders per month (until 2023)

Corporate DesignOnline ShopAI Automation

View all references →

What does bespoke web development cost?

Custom web development at mindmelt starts from €11,900 net for a standard project of up to 30 pages with a CMS. Projects involving forms, filters and search start from €18,900. Those requiring API integration, a login area or AI functionality start from €24,900. Smaller tasks - individual modules or a single API connection - are billed by the hour. For a precise figure, use the Budget Configurator.

What tech stack does mindmelt use?

We build on PHP, MySQL and REST APIs. Python handles automation and data processing. Node.js powers real-time applications. On the front end, we use HTML5, CSS3 and JavaScript. The framework? That depends on what the job needs.

Can you work with our IT team?

Yes, we regularly work alongside in-house IT teams. You'll get fully documented code and an API reference - and if it helps, we can work directly in your Git repository. Your IT team can see exactly what we're building at every stage.

How long does a development project take?

Development projects typically run 4 to 12 weeks. API integrations take 2 to 4 weeks, automation projects 2 to 3 weeks, and client portals 8 to 12 weeks. Milestones and delivery dates are agreed before the project kicks off.

Do you offer hosting?

Who owns the source code?

When the project's done, the source code is yours - along with full documentation and the database structure. Keep it in-house, hand it to another supplier, or carry on working with us. Your call.

Who builds your application

mindmelt is an owner-managed advertising and web agency based in Frankfurt am Main, Zeil 46. Since 2002, we've been building web applications, API integrations and custom CMS modules - more than 45 API projects and over 80 modules to date. The agency is run by Ingo Krumm.

At mindmelt, the people who make architectural decisions are the same people who write the code and live with the consequences. You speak directly with those working on your project.

Telephone: 069 21936250 ·

Get in Touch

Case Study: Industrial Supplier, Rhein-Main

The situation: An automotive supplier with 150 staff. Their product configurator was desktop-only - field sales couldn't use it. Orders came in by fax and email, entered into SAP by hand.

What we built: A web-based product configurator handling 2,400 variants. A REST API connecting directly to SAP for automatic order import. A dealer login with individual price lists. Fully responsive - runs on a tablet in the field.

Results after six months: Order processing time dropped from 25 minutes to 4 minutes. Error rates fell from 12% to under 1%. Field reps now configure on-site with the customer. SAP entry is fully automated.

Delivered in 10 weeks.