Web Design & Frontend
Modern UI, responsive layouts, accessibility, and speed optimization from day one.
- UX-first design
- Fast, lightweight builds
- Clean, maintainable code
Prague-based • Working internationally
High-performance web & backend development.
No bloat. No compromises.
We design and build fast, lightweight websites and custom backend systems for companies that care about performance, UX, and long-term maintainability.
- Custom web development
- Advanced backend systems
- Crypto & blockchain expertise
- Bank • PayPal • Crypto
FastPerformance-first builds
LeanMinimal overhead stacks
SecureBest-practice engineering
Built the way it should be built
At SEMLIN s.r.o., we build digital products that are lean, fast, secure, and designed around real user behavior. We don’t default to heavy page builders or bloated CMS setups.
We support platforms like WordPress when a project truly benefits from them, but our core focus is custom, performance-driven development with clean UX and minimal overhead.
Services
Serious engineering, clear communication, measurable results.
Backend Development
Custom APIs, integrations, automation, admin panels, and scalable system architecture.
- Robust APIs & services
- Security & scalability
- Databases & infrastructure
Web Apps & Systems
Dashboards, internal tools, SaaS platforms, user portals, and tailored business logic.
- Auth & roles
- Payments & billing
- Reliable deployments
Crypto & Blockchain
Technical support for blockchain projects, including wallet recovery (proof-of-ownership required).
- Wallet recovery (legitimate cases)
- Crypto payment integrations
- Smart contract support
Consulting & Audits
Architecture reviews, performance audits, and guidance to avoid expensive technical mistakes.
- Performance diagnostics
- Security review
- Tech strategy
Payments
We work with clients worldwide and accept multiple payment methods.
Bank transfer
PayPal
Crypto
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Not sure if we’re the right fit?
Ask our AI assistant a simple question about your project and get a clear, straight answer.
- No technical knowledge required
- Honest guidance, not sales talk
- Helps you decide the right approach
This is the same thinking we use with real clients — just faster.
SEMLIN AI Assistant
Demo mode
Why SEMLIN
Performance-first approach, custom solutions, lean stacks, and direct developer communication.
Performance first
Speed and responsiveness are fundamental.
Custom over generic
We build what your project needs, not what a template allows.
Lean technology stack
Fewer dependencies, fewer problems, better stability.
Clear communication
You talk directly to engineers.
Selected Work
A few examples of the kind of systems we build.
High-performance company website
Lean marketing site focused on speed, UX, and clean conversions.
FrontendPerformance
Custom backend + admin dashboard
API-first backend with role-based access and operational automation.
BackendAPIs
Crypto payment integration
Secure payment flows with clear UX, compliance-minded implementation.
CryptoIntegrations
How we work
Clear scope, clean delivery, and systems designed to last.
Discovery
We clarify goals, users, constraints, and success metrics.
Proposal & Architecture
Transparent scope, timeline, and technical plan.
Development
Performance, security, and maintainability from day one.
Delivery
Testing, deployment, and handover with documentation.
Support
We stay available as your product evolves.
Have a project in mind?
Fast website, custom backend system, or technical guidance — tell us what you need.