Recently there are several works which link session types and functional programming. 
Imperial College London has an open postdoc position on session types and programming languages, including Haskell and related theoretical studies. 

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Department of Computing, Imperial College London 
 
Research Associate (Post-doc, Full Time) £36,070 to £43,350 per annum 
 
Fixed-term: the starting date: as soon as possible   
                    the ending date: 19 May 2020  
 
Professor Nobuko Yoshida, Imperial College London 
 
A post is funded by EPSRC, the UK science funding agency and the 
titles of the projects are "From Data Types to Session Types: A Basis 
for Concurrency and Distribution" and "Application Customisation: 
Enhancing Design Quality and Developer Productivity". 
 
The goal is to further develop the theory and practice of session 
types for structuring concurrent and distributed software. 
 
The project has particular emphasis on putting theory into practice, 
by embedding session types in a range of programming languages and 
applying them to case studies; or developing the links between 
session types and other areas of theoretical computer science. The 
research programme includes collaboration with several companies and 
organisations: Amazon, Cognizant, Red Hat, ThoughtWorks, as well as 
November Group LLC and Weaveworks. 
 
The focus of Imperial College London Group is theories and 
applications of (Multiparty) Session Types (JACM,POPL'08), which include: 
 
-- Erlang (CC'17), Go (CC'16,POPL'17), Haskell (POPL'16), Scala 
(ECOOP'16), Java (FASE'16,FASE'17), MPI (OOPSLA'15,CC'15), C (FPL'16)  
and Python (FOAC,LMCS,FMSD); or 
 
-- automata/model checking (POPL'15,CONCUR'15,TACAS'16,FoSSaCs'17),  
linear logic (CONCUR'15) and bisimulations (CONCUR'15,ESOP'16,LMCS)  
 
For more details, see http://mrg.doc.ic.ac.uk 
 
Candidates for the post-doc position will need to have expertise in 
either:  
 
1. programming language design and implementation; or  
2. formal semantics, type theory and concurrency theory  
 
Different positions will be suitable for different points on the 
theory/practice spectrum. We will be especially interested in 
candidates with a combination of theoretical and practical skills. 
 
The contact person is  
 
Professor Nobuko Yoshida, Imperial College London 
(N.Yoshida@imperial.ac.uk
 
Details: http://www.jobs.ac.uk/job/AWU532/research-associate