This was advertised a couple of times last year and now tfl recruiting again for traffic managers for the central section of cross rail. Mix of signalling and also traction current switching work as required.
https://tfl.taleo.net/careersection/external/jobdetail.ftl?job=029248&tz=GMT+00:00
https://tfl.taleo.net/careersection/external/jobdetail.ftl?job=029248&tz=GMT+00:00