Software Engineer (Backend) → in Southampton

Build the cloud behind Tether: the services that take data from vehicles at sea over satellite and serve it live to operators and customers. Tether is the browser-based mission control that runs our Scout fleet, and through Tether Bridge it also runs other builders' vehicles. Data arrives over Iridium and Starlink, from position reports of a few bytes to live video and acoustic streams. You will build the APIs and services that take it in, store it and serve it to operators in real time, securely, because customers' data is often sensitive. Tether is offered from our cloud, as a white-label product under a customer's own brand, and on‑prem on air‑gapped networks, so the backend has to work in all three. What you will do Design and build APIs and services in Python and FastAPI. Ingest telemetry and sensor data arriving over Iridium and Starlink, and serve it to operators live. Run the platform on AWS with infrastructure as code, monitoring, security and cost control. Build data APIs that deliver each customer's telemetry and sensor data to their own dashboards and cloud. Bring in external feeds such as AIS, weather, tides and bathymetric charts for the operating picture. Support all three ways Tether is deployed: our cloud, white label and on‑prem, including air‑gapped networks. Scale the platform from dozens of vehicles to thousands, working closely with the front‑end and on‑board software engineers. What you will bring 10+ years building backend systems in production. Expert Python and FastAPI. Production AWS. Databases at scale, including time‑series data. Live data systems, including streaming, queues and WebSockets. Multi‑user, multi‑tenant systems where each customer sees only their own fleet and data. Southampton. Hybrid. Full time. Competitive salary.