The present disclosure relates systems and methods involving movable/adjustable platforms and/or guardrails. An example system a bracket configured to be coupled to a fixed structure having a walking surface and a flip door portion rotatably coupled to the bracket. The system also includes a guardrail portion extendibly coupled to the flip door portion and a telescopic linkage further coupling the flip door portion to the guardrail portion. The system additionally includes a locking mechanism with a locking pin. The locking pin is configured to maintain the flip door portion in a raised configuration. The system is configured to be adjusted between the raised configuration and a platform configuration.