Getting to the Developer Center in Solaris is a bit different from getting to Innovis. Here's a guide on how to get there from one-north MRT.

From the MRT, exit out of Connexis. Walk towards Innovis (that's where we usually have lesson):

Then, continue past Innovis…

And turn left onto Fusionopolis Walk.

Now just go towards the entrance to Solaris and enter the door.

Scan your QR code at the gantry, go up to level 5, and you'll be at the Developer Center!