SyDPaCC is a set of libraries for the Coq proof assistant. It allows to write naive functional programs (i.e. with high complexity) that are considered as specifications, and to transform them into more efficient versions. These more efficient versions can then be automatically parallelised before being extracted from Coq into source code for the functional language OCaml together with calls to the Bulk Synchronous Parallel ML (BSML) library. In this paper we present a new core version of SyDPaCC for the development of parallel programs correct-by-contruction using the theory of list homomorphisms and algorithmic skeletons implemented and verified in Coq. The framework is illustrated on the the maximum prefix sum problem.