The StoryFrom a castle over the Tejo to Null Problem: the road so far, as an 8-bit cutscene. ▶ Play the storyPause Replay ChaptersPress start nuno.pissarra.pt — a history.Abrantes — where it begins A castle on a hill over the Tejo. Here the castle is the firewall, the roads carry the packets and every car is traffic.Lisbon — university and INESC Electronic engineering at IST, then cryptography research at INESC-ID.The Bay Area — Cisco Connected-vehicle work with Cisco in California.Fleet tracking Back in Portugal: vehicles, GPS and sensor networks on a live map.Core banking Systems where every transaction has to land exactly once.Telecom and voice Voice platforms: calls routed between towers, speech in and out.Null Problem IT Consulting Founded in 2018: networks, security and software for banks, hospitals and IoT.