Sadeysa recently designed the set for the National Theatre Production of Death of England; Delroy (Written by RBC alumnus Roy Williams). Since graduating she has constantly sought to expand her knowledge and understanding of set design and theatre. Other theatre includes: Anansi the Spider and Anasi the Spider Respun at the Unicorn; Suckerpunch Boom Suite for nitroBEAT at the Barbican; Sugar and The Orphans of the Grange for Mapping Brent at Kiln; Gargantua and The Endless Night for Takeover Festival at Kiln; Open Doors at Harkers Studio; TYTP: 17 Bite your Tongue for Talawa; and I Call My Brothers at the Gate, Notting Hill; and The Legend of Hamba for tiata fahodzi at Greenwich + Docklands International Festival. As an artist, she was co-creator of The Unforgotten at the Young Vic.