diff --git a/maintainers/maintainer-list.nix b/maintainers/maintainer-list.nix
index 2770e7458362..ae01eabbee76 100644
--- a/maintainers/maintainer-list.nix
+++ b/maintainers/maintainer-list.nix
@@ -9289,6 +9289,12 @@
     github = "josephst";
     githubId = 1269177;
   };
+  josephsurin = {
+    name = "Joseph Surin";
+    email = "nix@jsur.in";
+    github = "josephsurin";
+    githubId = 14977484;
+  };
   joshniemela = {
     name = "Joshua Niemelä";
     email = "josh@jniemela.dk";
diff --git a/pkgs/by-name/fl/flatter/package.nix b/pkgs/by-name/fl/flatter/package.nix
new file mode 100644
index 000000000000..8f7cd7e65791
--- /dev/null
+++ b/pkgs/by-name/fl/flatter/package.nix
@@ -0,0 +1,51 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, unstableGitUpdater
+, cmake
+, blas
+, gmp
+, mpfr
+, fplll
+, eigen
+, llvmPackages
+}:
+
+stdenv.mkDerivation {
+  pname = "flatter";
+  version = "0-unstable-2023-08-10";
+
+  src = fetchFromGitHub {
+    owner = "keeganryan";
+    repo = "flatter";
+    rev = "500e31df6b7308e8101b2a4a9cc816bf8f483417";
+    hash = "sha256-STYx7cXvkcF+KqrG32pN16HWfEScc0zxkmOmfv43zIw=";
+  };
+
+  strictDeps = true;
+
+  nativeBuildInputs = [
+    cmake
+  ];
+
+  buildInputs = [
+    blas
+    gmp
+    mpfr
+    fplll
+    eigen
+  ] ++ lib.optionals stdenv.isDarwin [
+    llvmPackages.openmp
+  ];
+
+  passthru.updateScript = unstableGitUpdater { };
+
+  meta = with lib; {
+    description = "(F)ast (lat)tice (r)eduction of integer lattice bases";
+    homepage = "https://github.com/keeganryan/flatter";
+    license = licenses.lgpl3Only;
+    mainProgram = "flatter";
+    platforms = platforms.all;
+    maintainers = with maintainers; [ josephsurin ];
+  };
+}