Developer in Mercury—Declarative Logic and Functions

I develop programs in Mercury—a pure declarative language that unites logic and functional programming under a strict static type system, mode analysis, and determinism checking. If your domain is saturated with rules, constraints, and solutions that must be consistent, I turn those rules into code whose honesty the compiler itself guarantees. Mercury is not Prolog with cosmetics and not Haskell in a logic mask: type inference, mode, and determinism analysis catch whole classes of errors before the first test runs, and that's exactly what rule-heavy, verification-focused systems need.

In practice, I model your domain with predicates and functions bearing explicit modes, so data flow, failure, and nondeterminism are declared and checked, not implied. I design deterministic cores where correctness is critical, leave nondeterministic search where the task truly branches, and use Mercury's module system to keep large rule bases readable and maintainable for years. I care about clean interfaces, exhaustive case analysis, and total functions—in a declarative language, these properties let you reason about behavior rather than guess.

I can start a project from a specification, rescue a tangled existing Mercury codebase, or build a compact rule engine, analyzer, or transformation tool that other services call. I document the logic of each module, write meaningful tests around what the compiler can't prove, and deliver code a future maintainer will actually understand.

— Mercury programs to specification: predicates, functions, explicit modes
— Rule engines and declarative decision logic for regulated domains
— Type, mode, and determinism design for consistent code
— Refactoring and rescue of tangled existing Mercury projects
— Analyzers, transformers, and DSLs on a logic-functional foundation
— Integration of Mercury cores with surrounding services and tools