The satellites work in pairs, with one providing atmospheric sounding and imaging data, and the other offering microwave imaging and radar observations.
The satellites included a propulsion system which allowed them to begin a descent into the sea after their mission was complete, reducing space debris.
Martin Gittins, head of propulsion programme at Airbus Stevenage, said more than 100 engineers have worked on the project in the Hertfordshire town alone.
He has worked on this project with his team since 2016.
He said: “You can’t get much more exciting than seeing a rocket launch and your payload being delivered safely into space.
“Yes, it’s a long programme, but you have to balance that with the excitement of the launch.”