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Custom Web Development

Web Development Agency

Custom web development with Next.js, React, Node.js, Python, custom WordPress and more. Frontend, backend, full-stack, APIs, e-commerce, integrations. Difference to web design: we program complex business logic, not just interfaces. Dev hours €140/h or project-based fixed prices.

250+ dev projects
Next.js + React experts
GDPR + EU hosting

Benefits

Performance-First

Core Web Vitals under 2.5s LCP standard. Lighthouse scores 95+. Edge caching, CDN, bundle optimization from day 1.

Tech Stack Flexibility

Next.js for performance, custom WordPress for content teams, Python for data apps. We choose by requirement, not dogma.

Built to Scale

Code architecture that doesn't break at 10x growth. No spaghetti code, clear backend/frontend separation, tests for critical flows.

Ownership-Friendly

You get source code, deployment docs, architecture diagrams. No vendor lock, any other agency can take over later.

6 Web Development Services

Frontend, backend, e-commerce, integrations — all from one source.

Frontend Development (Next.js, React)

Modern frontend apps with Next.js 15 App Router, React 19, Tailwind v4, TypeScript. Server components for performance, client components for interactivity. SEO-ready through SSR/ISR, Core Web Vitals optimized. Alternative: Vue.js / Nuxt on team preference.

Backend Development (Node.js, Python)

APIs and business logic with Node.js (Express, Fastify), Next.js API routes or Python (FastAPI, Django). PostgreSQL or MongoDB as database. Auth via NextAuth, Clerk or custom JWT. Deployment on Cloudflare Workers, Vercel or own VPS.

E-Commerce Development

Shopify custom themes, WooCommerce development, Medusa.js for headless, own custom shops with Next.js + Stripe/Klarna/PayPal. Payment integration, tax handling (Austrian VAT), multi-currency, wishlist, abandoned cart recovery, analytics integration.

API Integrations

Connection to CRM (HubSpot, Salesforce, Pipedrive), ERP (SAP, Microsoft Dynamics), marketing (Mailchimp, ActiveCampaign), payment (Stripe, Braintree), accounting (DATEV, BMD). REST + GraphQL, webhook handling, OAuth2 setup. Documentation of integration architecture.

WordPress Custom Development

Custom WordPress themes from scratch (no Elementor/Divi bloat), plugin development, Gutenberg blocks, REST API customization, multisite setups. For clients with WordPress commitment but custom requirements beyond template marketplace.

Performance & CWV Optimization

Optimize existing websites for Core Web Vitals, Lighthouse 95+, LCP under 2.5s. Bundle splitting, image optimization (WebP/AVIF), edge caching, critical CSS, preload strategies, third-party script isolation. Audit package €1,490 for existing sites.

Web Development Packages

Project-based fixed prices or time & material at €140/h.

Small Project
€5,000 from

Simple frontend projects

  • Single-page app or landing builder
  • Next.js or React
  • Basic CMS integration
  • Responsive + SEO-ready
  • Deployment to Cloudflare/Vercel
  • 3 months bugfix support
Send Request
Popular
Mid Project
€15,000 from

Multi-feature apps with backend

  • Frontend + backend (full-stack)
  • API development
  • Database design (PostgreSQL)
  • Auth & user management
  • 2-3 third-party integrations
  • Tests for critical flows
  • 6 months support + maintenance
Send Request
Enterprise
€50,000+ from

Complex business systems

  • Custom software architecture
  • Microservices or monolith
  • Custom ERP/CRM integrations
  • Advanced security audits
  • Multi-region deployment
  • CI/CD pipeline
  • Dedicated lead developer
  • 12 months support
Send Request

6-Step Development Process

Agile sprints, 2-week demos, continuous integration.

STEP 01

Tech Discovery

Requirements gathering, technical assessment, architecture decisions, timeline + budget scoping.

STEP 02

Architecture

System design, data models, API specs, tech stack decision, deployment strategy.

STEP 03

Sprint Planning

Feature breakdown into 2-week sprints, prioritization via MoSCoW, test coverage goals.

STEP 04

Development

Agile sprints with demo every 2 weeks, continuous integration, peer reviews, tests for critical flows.

STEP 05

QA & Testing

Automated tests (unit + integration), manual QA, performance testing, security review, accessibility check.

STEP 06

Deployment & Handover

Production deployment, monitoring setup (Sentry, logs), documentation, code walkthrough for your team.

Frequently Asked Questions About Web Development

Answers to frequently asked questions.

Web design = visual design and frontend surface (HTML/CSS/basic JS). Web development = complex business logic, backend systems, databases, APIs, integrations. A web designer builds the pretty landing page, a web developer builds the booking system behind it. With us: web design services use template frameworks (WordPress, Elementor), web development is custom code for specific business logic. Many projects need both — we offer full-stack.

Our 2026 default stack: frontend Next.js 15 + React 19 + Tailwind + TypeScript. Backend Node.js (Next.js API routes or Express) or Python (FastAPI for data-heavy). Database PostgreSQL (Supabase or self-hosted). Auth NextAuth or Clerk. CMS Payload (headless) or custom WordPress. Deployment Cloudflare or own VPS (EU). Alternative stacks by client preference: Vue/Nuxt, Angular, Laravel, Ruby on Rails — we're not dogmatic.

Two models: (1) Time & material at €140/h (senior dev) or €90/h (mid-level). Billing in 30-min blocks, monthly invoice. Good for unclear scope or agile collaboration. (2) Project-based fixed prices: Small from €5,000, Mid from €15,000, Enterprise from €50,000. Includes: discovery, architecture, development, QA, deployment. Not included: infrastructure costs (hosting, DB from €29/month), ongoing maintenance (from €249/month).

WordPress: ideal for content-marketing-heavy, WordPress ecosystem (plugins), small teams without dev resources. Cheaper in setup (€5-15k), but performance limits (LCP usually 3-5s) and plugin chaos at scale. Next.js: ideal for performance focus (LCP under 2s), complex integrations, custom features, modern frontend patterns. More expensive in setup (€15-50k), but measurably faster, more scalable and SEO-stronger. Rule of thumb: under 30 pages + content marketing = WordPress, everything else = evaluate Next.js.

Small project (single-page app, landing): 2-4 weeks. Mid project (full-stack with backend + DB): 6-12 weeks. Enterprise project (complex business logic, multi-integrations): 3-9 months. Factors that extend: unclear requirements, multi-step approvals, external API dependencies, parallel to legacy system. We work in 2-week sprints with demo calls, you see progress continuously and can prioritize.

Our 250+ dev projects cover: SaaS and startup products (30%), e-commerce (25%), corporate websites with custom features (20%), internal tools / admin dashboards (15%), fintech / healthcare with compliance (10%). Concrete references we show pre-engagement with client consent. Alternative: discovery call (30 min free), where we clarify whether we're the right tech partner for your stack preferences and industry.

Yes — maintenance retainer from €249/month (basic: security updates, dependency updates, monitoring) or €749/month (enhanced: incl. bug fixes, small feature additions, performance monitoring). Without maintenance: WordPress plugins have 30-60 day update cycles, Node.js security patches monthly. Neglected sites become security liabilities within 6-12 months. Recommendation: at least basic maintenance for production sites.

Three collaboration modes: (1) Augmentation — our dev works as part of your team, uses your tools (GitHub, Jira, Slack), participates in daily standups. From €140/h, typically 60-120h/month. (2) Delegated feature — we take over defined features with own timeline, handoff to your team. (3) Consulting — technical reviews, architecture advice, code audits as sparring for your team. All modes with Git-based collaboration, code reviews and documentation.

Yes — after final payment, yours: (1) entire source code in your Git repository (GitHub/GitLab/Bitbucket). (2) Deployment documentation and architecture diagrams. (3) Complete usage rights without restriction. (4) Third-party licenses (if commercial packages used, transferable). No vendor lock-in, any other agency can take over later. We may show the project as a case study (if not contractually excluded).

Three differentiators: (1) Full-stack expertise instead of frontend-only or backend-only — we build complete systems, not isolated components. (2) Performance-native — Core Web Vitals, Lighthouse 95+ are standard, not post-launch optimization. (3) Ownership-friendly — we build so your team (or another agency) can take over later, no custom frameworks creating vendor lock. Plus: transparent hourly rates + fixed prices (no hidden change requests), Vienna location with EU hosting infrastructure.

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The GoldenWing team in the Vienna studio

The team behind your project

No agency façade — these are the people who will actually work on your project, from our studio in Vienna.

DI (FH) Benedikt Hasibeder

DI (FH) Benedikt Hasibeder

Your contact person · Co-Founder

Benedikt is happy to advise you personally — call him directly or book an appointment.

Ready for Your Dev Project?

Free technical initial call (30 min). We discuss your tech stack, requirements and timeline.