12G Flight Systems

12G Flight Systems Sweden AB is a product development and consulting firm specializing in the space industry, offering software libraries, technical writing, systems and software engineering, quality assurance, and lean process improvement services. The company was founded around 2018 in Västerås, Sweden by Slavomir Petrik and Katarina Petrik.

The company's flagship product, PUSopen®, is a MISRA-C library for CCSDS and ECSS Packet Utilization Standard (PUS) satellite payload communication. PUSopen has space heritage across multiple in-orbit missions and counts Rocket Lab, Open Cosmos, Unibap, and other European space companies among its customers. The library covers PUS-C and PUS-A protocols, CCSDS Space Packet handling, virtual channels, and multi-bus packet routing, with 800+ validation tests.

12G also offers technical writing consulting under their trademarked "Minimum Viable Documentation®" methodology, quality assurance planning, checklists, templates, and lean process deployment training workshops for engineering teams.