Full-Stack Development
From database to UI - everything from one source. We develop complete applications with modern technologies.
Admin Dashboards
Custom React dashboards instead of Retool/Appsmith. Full control over UX, performance and features.
Custom Business Software. No Compromises.
Off-the-shelf software not enough? Low-code too unstable? We develop robust internal tools, APIs and middleware with modern tech stack - scalable, type-safe and maintainable.
- TypeScript
- React/Next.js
- Microservices
- DevOps
Engineering
Engineering, Not Tinkering
Many companies try to map complex processes with drag-and-drop tools. The result: Unmaintainable "spaghetti workflows", missing error handling and security vulnerabilities.
We solve problems with code
We are software engineers. We solve problems with code. We build applications that are testable, version-controlled (Git) and don't buckle under millions of records.
Code > Low-Code
Real code is testable, versionable and scalable. It belongs to you, incurs no per-execution license costs and doesn't break just because a UI button changes.
Services
Our Engineering Services
From the database to operations: we write and operate your software.
API Design (REST/GraphQL)
Clean, documented APIs with OpenAPI/Swagger. Standards-compliant, versioned and consumable by your partners.
Legacy Integration
Middleware for SOAP, legacy databases and ERP systems. We connect your legacy systems with modern apps.
Data Processing
High-performance data processing with Go/Python. Batch jobs, ETL pipelines and stream processing.
Type-Safe Development
TypeScript, Go - errors are caught before runtime. Fewer bugs, more stability in production.
CI/CD Integration
Automated tests, deployments and code reviews. Every change is verified before going live.
Microservices
Modular architecture for scalability. Or a well-structured monolith - whatever fits your needs.
Managed Hosting
We write AND operate your software. DevOps included - on Hetzner, AWS or in your private cloud.
Our Tech Stack
Professional tools for professional software
| Area | Technology | Why |
|---|---|---|
| Frontend | React / Next.js / Vue.js | Full control over UX/UI with Tailwind and Shadcn/UI |
| Backend | Node.js (NestJS) / Go / Python | Real APIs, real validation, type-safe |
| Database | PostgreSQL / Redis | Clean schema design with migrations |
| Infrastructure | Docker / Kubernetes | Infrastructure as Code instead of manual hosting |
Real-World Use Cases
How we solve real problems
High-Performance Data Processing
Problem
Import and validate 100,000 CSV rows per night. Zapier crashes.
Solution
A Go microservice that parses the stream, validates and writes via batch insert to the DB. Takes seconds instead of hours. Go · PostgreSQL · Redis Queue
Complex Admin Dashboard
Problem
Appsmith/Retool is too inflexible for complex UI requirements (e.g., custom calendar view).
Solution
A Next.js dashboard with custom React components, optimized caching and perfect UX. Next.js · React · Tailwind · Prisma
API Gateway / Middleware
Problem
The ERP system has an ancient SOAP interface.
Solution
A Node.js wrapper that translates SOAP into a clean REST/GraphQL API that modern apps can consume. NestJS · SOAP-to-REST · OpenAPI
Scoping Sprint
Define scope and price before development
Requirements, target architecture and effort are clarified. The result is a fixed-price offer for implementation.
Scoping Sprintfrom €1,490 excl. VATone-time
Frequently Asked Questions
Answers to the most important questions about custom software development
Code vs. Low-Code
- Low-code is great for prototypes. But beyond a certain complexity it becomes unmaintainable, slow and expensive. Real code is testable, versionable and scalable. It belongs to you, incurs no per-execution license costs and doesn't break just because a UI button changes.
- No. We use established frameworks such as React, NestJS or Symfony, while developing the domain logic around your prioritized processes and jointly defined acceptance criteria.
- We use standards from professional software development: Git for version control, CI/CD pipelines for automatic deployments, automated tests (Unit/E2E) and code reviews. This sets us apart from freelancers who "script something".
- That's our core business. We analyze your existing Zapier/n8n workflows, identify the weak points and gradually migrate to real code. We often start with the most critical component.
Tech Stack & Architecture
- We choose the best tool for the job: TypeScript/Node.js for fast web backends, Go (Golang) for high-performance background services, Python for data processing and AI, PHP for web platforms.
- You do. 100%. You get access to the Git repository. No vendor lock-in through proprietary platforms.
- We're not dogmatic. For many SMBs, a well-structured modular monolith is better than 50 complex microservices. We choose the architecture that fits your team size and requirements.
Integration & Legacy
- Yes. We write middleware (connectors) that securely access legacy systems and prepare the data in modern format (e.g., as JSON API). This lets you build modern frontends without touching the old backend.
- Gladly. We often follow the headless approach. We build a clean, documented API (Swagger/OpenAPI) that can then be used by your team, mobile apps or partners.
- Yes. We seamlessly integrate into existing architectures. Whether new modules for your CRM, additional endpoints for your API or a completely new frontend for your backend - we extend what already works.
- We write scripts that extract data from old schemas, clean it (fix encoding errors, normalization) and transfer it to modern databases (PostgreSQL).
Process & Costs
- With an architecture workshop. We analyze your requirements, sketch the technical solution and create a proposal. Development only begins after your approval.
- It depends on the scope. A simple admin dashboard starts at around €8,000-15,000. Complex platforms with multiple microservices cost more. We work with fixed prices per milestone - no nasty surprises.
- An MVP (Minimum Viable Product) is often ready in 4-8 weeks. Then we iterate based on your feedback. Agile sprints ensure you see results quickly.
Knowledge
Further reading
Related focus areas
Reviews & projects
Software projects with reliable outcomes
Proof for modernization, API extension, architecture, deployment and ongoing operations.
WZ-IT moved our studio infrastructure from decentralised individual devices to a central platform: every site is securely connected via VPN, new devices are onboarded automatically and an entire site is provisioned from a template, without manual steps on location. What impressed me most is the breadth and depth of their knowledge: Timo and Robin are not a typical IT provider who sets up a server and leaves. The two of them think their way into highly complex infrastructure and software topics, work through every requirement we put in front of them, and build networking, provisioning and operations so that everything fits together in the end. WZ-IT is an excellent partner for complex software, network and architecture projects.
Steve KirchnerManaging Director, nextGYM GmbH
International
Built in Germany's Ruhr Valley. Running worldwide.
WZ-IT designs, develops and operates infrastructure and software for clients in Germany and internationally. We deliver projects remotely and continue supporting them in ongoing operations after go-live.
Selected projects
- LiveRemote access platform for distributed water treatment plantsABCO Water Systems · Australia · Secure Access & OT
- 81%AWS migration with substantially lower operating costsEVA Real Estate · UAE · Cloud exit & infrastructure
- 98%Provision new sites in minutes instead of hoursnextGYM GmbH · Germany · Automation & IoT
Read client reviews
Enquiry
Define your custom application
Describe the users, workflow, and systems to replace or connect.
- Straight with Timo and Robin - no sales team, no pitch
- A professional assessment of your situation
- Concrete next steps for infrastructure, software or AI
The conversation is free and non-binding.
WZ-IT's advice on our Azure migration was technically sound and completely non-binding right from the intro call - we took away a great deal.
Jakob ÖschlbergerInno7 GmbH
WZ-IT's advice on our Azure migration was technically sound and completely non-binding right from the intro call - we took away a great deal.