[ 01 ]Software and infrastructure · Prague
Custom web and mobile development from Prague, on infrastructure we own and operate ourselves, since 2001.
Operating base
[ 02 ]What we do
All of it runs in production today. The tags name the tools.
PHP 8 and Go, Slim, Twig, MySQL and PostgreSQL, on an in-house project skeleton with static analysis and tests from day one. Our specialty is multi-tenant platforms: one codebase serving dozens of domains, each with its own look and configuration.
Our own Supermicro servers in a Prague datacenter, with ECC memory, hardware RAID and redundant power. Over 100 websites and about 220 DNS zones run behind nginx and PHP-FPM, with Let's Encrypt everywhere, Prometheus and Grafana watching, and nightly borg backups to a second site.
We run our own mail: Postfix, Dovecot and rspamd, with SPF, DKIM and DMARC aligned on every domain we send for. The relay sends transactional mail only. Postmaster and abuse contacts are published and answered.
We operate online communities and two multi-tenant Czech networks: a classifieds network on 69 domains and a content and lead-generation network on 45 domains. Each runs from one codebase, with one configuration file per site.
SiliconRelay.com is our own ad exchange, written in Go. It runs a real-time auction, counts an impression only when the ad is actually rendered, measures viewability on every one, and exports the same event log the bills come from for reconciliation.
Radar CZ puts the Czech weather radar on Apple Maps, with a timeline and widgets. Kettlebeep is an interval timer that never touches the network. Both are published by Internet 1 CZ s.r.o.
Collectors that sample market data every ten seconds from four venues, road-incident aggregation from public feeds, price and listing monitors, and dashboards that end up on an LED display on the wall.
Products built on Claude, such as a lease-contract checker against the Czech civil code and a curriculum generator. MCP servers for semantic search over our documentation and for a CRM. A local lead classifier that costs nothing per message, and Czech speech-to-text benchmarked on our own hardware.
[ 03 ]Selected work
An ad exchange we run in public, two apps for iPhone and iPad, and two systems our own company runs on.
Ad exchange with render-confirmed counting and a public page explaining how we count.
ČHMÚ weather radar on Apple Maps, with widgets and a Go overlay proxy.
Interval timer for kettlebell and circuit training. No tracking.
Invoicing and business management, with ARES and VAT-register lookups and bank matching.
Exporters, Grafana alerting, healthchecks and offsite backups across our fleet.
Apps
Support and privacy pages for every app we publish.
Our apps →[ 04 ]Contact
Write to info@internet1.cz or use the form. We answer within one working day.
Get in touch