Software & Platforms

Web Development that actually performs

We build web applications with React and Next.js that load blazing fast, rank high in Google, and scale effortlessly. No templates — everything custom, from the first line of code to the last pixel.

Our process

Project environment

Real-time insight into your project — anytime, anywhere.

app.ontwikkelaars.nl

Project overview

Daily summary of your project.

Project progress
87%
Sprint 4 of 5 completed
24Open tasks
Week 7Current sprint

What we build

From landing page to enterprise platform

Whether it's a marketing site, SaaS application or e-commerce platform — we build the right solution with the right technology. Scalable, maintainable and ready to grow.

  • 01Custom React/Next.js web applications
  • 02Custom API integrations with existing systems
  • 03E-commerce solutions with Stripe or Mollie
  • 04Progressive Web Apps with offline support

Discovery

Everything mapped out — before the first sprint.

intake.ontwikkelaars.nl

Intake meeting

Getting to know your organisation and requirements.

Business goals and vision
Target audience and users
Technical requirements
Budget and timeline
Existing systems

Our approach

Iterative, testable and transparent

No black-box development. You're involved in every sprint, see progress live and can steer where needed. Quality is baked into our process — not an afterthought.

  • 01Code reviews at every sprint
  • 02Automated testing + CI/CD pipeline
  • 03Weekly demos with live feedback
  • 04Full documentation on delivery

Quality assurance

Only live when every detail is right.

qa.ontwikkelaars.nl

Test overview

Status of all test categories.

Functional tests42/42
Integration tests18/18
User tests8/10
Regression tests31/31
99 of 101 tests passed

Quality & delivery

Core Web Vitals in the top 10%

Performance and accessibility are not extras for us — they're standard in every solution. Your site loads fast, scores well and is accessible to everyone.

  • 01Lighthouse score >90 as standard
  • 02WCAG 2.1 AA accessibility
  • 03SEO-optimised HTML structure
  • 04Hosting and monitoring included

Launch

Live — controlled, guided and flawless.

deploy.ontwikkelaars.nl

Deployment pipeline

Step-by-step rollout to production.

Build successful
Staging tested
DNS configured
Production deploy
Smoke tests
Zero-downtime deployment completed
Case study

SaaS platform from 0 to 10K users in 90 days

A scale-up asked us to build a complete platform — from auth to dashboards to payments. Result: 10K+ users, 99.9% uptime and sub-second load times on day 90.

10K+

users

99.9%

uptime

<1s

load time

No agency talk, just results

No templates, all custom

We don't build sites on WordPress themes or website builders. Every application starts with an empty editor and ends as something unique — tailored to your brand and users.

Performance is not optional

We optimize by default for a Lighthouse score of 95+. Every millisecond of load time counts: a faster site converts better and ranks higher in Google.

SEO baked in from day 1

Technical SEO is not an extra service — it's part of how we write code. From semantic HTML to correct canonical tags and structured Schema.org data.

Your questions, honestly answered

It depends heavily on complexity. A marketing site with CMS starts around €4,000–€8,000. A web application with user authentication, dashboards and API integrations is more in the €15,000–€50,000 range. After our intake call you always receive a fixed quote — no hourly invoices afterwards.

A simple site is live in 3–4 weeks. A complex application takes an average of 8–16 weeks. We communicate lead times proactively and hit our deadlines.

Absolutely. If you already have a Figma file or other design assets, we implement that accurately. Don't have a design yet? We can take care of that too, as part of the project.

Yes, regularly. We do technical audits, refactor legacy code and migrate sites to Next.js. Tell us what could be better — we'll honestly assess whether it's feasible.

Our standard stack: Next.js 15, TypeScript, Tailwind CSS, Prisma and PostgreSQL or Supabase. For e-commerce we add Stripe or Mollie. We always choose the most appropriate tools for your specific situation.

Security is baked into our development process. We work with HTTPS, CSRF protection, input validation and parameterized queries as standard. Authentication is built with proven libraries like NextAuth or Clerk. For sensitive applications we also conduct a security review before launch.

Let's discuss your project

Schedule a free intro call. We discuss your needs and advise on the best approach.