Web App Development
Web apps that behave like installed software
Custom SaaS front-ends in Next.js and React — fast, accessible, production-ready on launch day.
Q2 · 2026
Annual recurring revenue
last sync 12s ago
€4.82M
+18.4%
Active accounts
1,284
+42
Churn 30d
0.84%
−0.12
NPS
63
+4
What we build
Three classes of web app we ship every week
SaaS dashboards, internal tools, customer-facing portals. All three run on the same front-end stack — the difference lives in the data model.
Default stack for a new web app
Outcomes
What we insist on by delivery day
A web app does not ship until it clears these four bars — measured, not claimed.
- TTI
- < 2.5s
- Time-to-interactive on mid-tier mobile
- a11y
- WCAG AA
- Validated via automated and manual audits
- Tests
- 85%+
- Coverage on domain logic & API layer
- Lighthouse
- 95+
- Performance, best practices, SEO
By the numbers
This is hafencity.dev
15+ Experts
Engineers, designers, and strategists working as one practice from our Hamburg HQ.
50+ Clients
Companies across consumer, healthcare, and B2B trust us with their digital products. Long-term partnerships are the default.
97% Recommendation rate
Repeat engagements and references our buyers actually call. Trust compounds when delivery does.
50+ Launches
Custom mobile and web products shipped from concept to maintenance — owned end-to-end by our team.
100% In-house
Strategy, design, and engineering all live at our Hamburg HQ. One team, one project lead, accountable to you from kickoff to launch.
Since 2023
Helping companies ship digital products — and growing alongside the teams we work with.
Next steps
Let's talk about your project
Book a 30-minute discovery call. We'll review your goals, surface unknowns, and outline how we would run the engagement.
Booking calendar (Cal.com)
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