diff --git a/.github/workflows/compose-mixed.yml b/.github/workflows/compose-mixed.yml
new file mode 100644
index 0000000..40434d5
--- /dev/null
+++ b/.github/workflows/compose-mixed.yml
@@ -0,0 +1,125 @@
+name: Compose Mixed Workload
+
+on:
+  workflow_dispatch:
+
+jobs:
+  compose-mixed-workload:
+    runs-on: ubuntu-latest
+    env:
+      TMPDIR: ${{ github.workspace }}/.tmp
+      NOMOS_TESTNET_IMAGE: nomos-testnet:local
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Prepare workspace tmpdir
+        run: mkdir -p "$TMPDIR"
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install system dependencies
+        run: |
+          set -euo pipefail
+          if command -v sudo >/dev/null 2>&1; then
+            sudo apt-get update
+            sudo apt-get install -y clang llvm-dev libclang-dev pkg-config cmake libssl-dev rsync libgmp10 libgmp-dev libgomp1 nasm
+          else
+            apt-get update
+            apt-get install -y clang llvm-dev libclang-dev pkg-config cmake libssl-dev rsync libgmp10 libgmp-dev libgomp1 nasm
+          fi
+
+      - name: Cache cargo registry
+        if: env.ACT != 'true'
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-
+
+      - name: Cache target directory
+        if: env.ACT != 'true'
+        uses: actions/cache@v4
+        with:
+          path: target
+          key: ${{ runner.os }}-target-compose-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-target-compose-
+
+      - name: Install circuits for host build
+        env:
+          NOMOS_CIRCUITS_PLATFORM: linux-x86_64
+          NOMOS_CIRCUITS_REBUILD_RAPIDSNARK: "1"
+          RAPIDSNARK_FORCE_REBUILD: "1"
+          RAPIDSNARK_BUILD_GMP: "0"
+        run: |
+          CIRCUITS_DIR="${TMPDIR}/nomos-circuits"
+          chmod +x scripts/setup-nomos-circuits.sh
+          scripts/setup-nomos-circuits.sh v0.3.1 "$CIRCUITS_DIR"
+          # Copy into build context so Docker doesn't need network
+          mkdir -p tests/kzgrs/circuits_bundle
+          if command -v rsync >/dev/null 2>&1; then
+            rsync -a --delete "$CIRCUITS_DIR"/ tests/kzgrs/circuits_bundle/
+          else
+            rm -rf tests/kzgrs/circuits_bundle/*
+            cp -a "$CIRCUITS_DIR"/. tests/kzgrs/circuits_bundle/
+          fi
+          echo "NOMOS_CIRCUITS=$CIRCUITS_DIR" >> "$GITHUB_ENV"
+          echo "CIRCUITS_OVERRIDE=tests/kzgrs/circuits_bundle" >> "$GITHUB_ENV"
+
+      - name: Build compose test image
+        env:
+          DOCKER_CLI_HINTS: "false"
+          IMAGE_TAG: ${{ env.NOMOS_TESTNET_IMAGE }}
+          CIRCUITS_OVERRIDE: ${{ env.CIRCUITS_OVERRIDE }}
+        run: |
+          chmod +x testnet/scripts/build_test_image.sh
+          ./testnet/scripts/build_test_image.sh
+
+      - name: Run compose mixed workload test
+        env:
+          POL_PROOF_DEV_MODE: "true"
+          COMPOSE_NODE_PAIRS: "1x1"
+          NOMOS_TESTNET_IMAGE: ${{ env.NOMOS_TESTNET_IMAGE }}
+          RUST_BACKTRACE: "1"
+        run: |
+          mkdir -p "$TMPDIR"
+          if [ "${{ env.ACT }}" = "true" ]; then
+            export COMPOSE_RUNNER_PRESERVE=1
+          fi
+          cargo test -p tests-workflows compose_runner_mixed_workloads -- --nocapture
+
+      - name: Collect compose logs
+        if: failure()
+        run: |
+          mkdir -p ci-artifacts/compose
+          docker ps -a --filter "name=nomos-compose-" --format '{{.ID}} {{.Names}} {{.Status}}' > ci-artifacts/compose/containers.txt || true
+          for id in $(docker ps -a --filter "name=nomos-compose-" -q); do
+            docker logs "$id" > "ci-artifacts/compose/${id}.log" 2>&1 || true
+          done
+          if compgen -G "tests/.tmp*/__logs.*" > /dev/null; then
+            mkdir -p ci-artifacts/tests
+            find tests -path "tests/.tmp*/__logs.*" -type d -print0 | while IFS= read -r -d '' dir; do
+              tar -czf "ci-artifacts/tests/$(basename "$(dirname "$dir")")-$(basename "$dir").tgz" -C "$dir" .
+            done
+          fi
+
+      - name: Upload compose artifacts
+        if: failure() && env.ACT != 'true'
+        uses: actions/upload-artifact@v4
+        with:
+          name: compose-mixed-workload-logs
+          path: ci-artifacts
+
+      - name: Cleanup compose containers
+        if: always() && env.ACT != 'true'
+        run: |
+          ids=$(docker ps -a --filter "name=nomos-compose-" -q)
+          if [ -n "$ids" ]; then
+            docker rm -f $ids
+          fi
diff --git a/scripts/build-rapidsnark.sh b/scripts/build-rapidsnark.sh
index 2410c31..800791e 100755
--- a/scripts/build-rapidsnark.sh
+++ b/scripts/build-rapidsnark.sh
@@ -15,6 +15,10 @@ TARGET_ARCH="$(uname -m)"
 CIRCUITS_DIR="$1"
 RAPIDSNARK_REPO="${RAPIDSNARK_REPO:-https://github.com/iden3/rapidsnark.git}"
 RAPIDSNARK_REF="${RAPIDSNARK_REF:-main}"
+FORCE_REBUILD="${RAPIDSNARK_FORCE_REBUILD:-0}"
+BUILD_DIR=""
+PACKAGE_DIR=""
+CMAKE_TARGET_PLATFORM=""
 
 if [ ! -d "$CIRCUITS_DIR" ]; then
     echo "circuits directory '$CIRCUITS_DIR' does not exist" >&2
@@ -22,25 +26,43 @@ if [ ! -d "$CIRCUITS_DIR" ]; then
 fi
 
 system_gmp_package() {
-    local multiarch
-    multiarch="$(gcc -print-multiarch 2>/dev/null || echo aarch64-linux-gnu)"
+    local multiarch arch
+    arch="${1:-${TARGET_ARCH}}"
+    multiarch="$(gcc -print-multiarch 2>/dev/null || echo "${arch}-linux-gnu")"
     local lib_path="/usr/lib/${multiarch}/libgmp.a"
     if [ ! -f "$lib_path" ]; then
         echo "system libgmp.a not found at $lib_path" >&2
         return 1
     fi
-    mkdir -p depends/gmp/package_aarch64/lib depends/gmp/package_aarch64/include
-    cp "$lib_path" depends/gmp/package_aarch64/lib/
+    mkdir -p "depends/gmp/package_${arch}/lib" "depends/gmp/package_${arch}/include"
+    cp "$lib_path" "depends/gmp/package_${arch}/lib/"
     # Headers are small; copy the public ones the build expects.
-    cp /usr/include/gmp*.h depends/gmp/package_aarch64/include/ || true
+    cp /usr/include/gmp*.h "depends/gmp/package_${arch}/include/" || true
 }
 
 case "$TARGET_ARCH" in
     arm64 | aarch64)
+        CMAKE_TARGET_PLATFORM="aarch64"
+        BUILD_DIR="build_prover_arm64"
+        PACKAGE_DIR="${RAPIDSNARK_PACKAGE_DIR:-package_arm64}"
+        ;;
+    x86_64)
+        if [ "$FORCE_REBUILD" != "1" ]; then
+            echo "rapidsnark rebuild skipped for architecture '$TARGET_ARCH' (set RAPIDSNARK_FORCE_REBUILD=1 to override)" >&2
+            exit 0
+        fi
+        CMAKE_TARGET_PLATFORM="x86_64"
+        BUILD_DIR="build_prover_x86_64"
+        PACKAGE_DIR="${RAPIDSNARK_PACKAGE_DIR:-package_x86_64}"
         ;;
     *)
-        echo "rapidsnark rebuild skipped for architecture '$TARGET_ARCH'" >&2
-        exit 0
+        if [ "$FORCE_REBUILD" != "1" ]; then
+            echo "rapidsnark rebuild skipped for unsupported architecture '$TARGET_ARCH'" >&2
+            exit 0
+        fi
+        CMAKE_TARGET_PLATFORM="$TARGET_ARCH"
+        BUILD_DIR="build_prover_${TARGET_ARCH}"
+        PACKAGE_DIR="${RAPIDSNARK_PACKAGE_DIR:-package_${TARGET_ARCH}}"
         ;;
 esac
 
@@ -53,20 +75,26 @@ cd "$workdir/rapidsnark"
 git submodule update --init --recursive >&2
 
 if [ "${RAPIDSNARK_BUILD_GMP:-1}" = "1" ]; then
-    GMP_TARGET="${RAPIDSNARK_GMP_TARGET:-aarch64}"
+    if [ -z "${RAPIDSNARK_GMP_TARGET:-}" ]; then
+        if [ "$CMAKE_TARGET_PLATFORM" = "x86_64" ]; then
+            GMP_TARGET="host"
+        else
+            GMP_TARGET="$CMAKE_TARGET_PLATFORM"
+        fi
+    else
+        GMP_TARGET="$RAPIDSNARK_GMP_TARGET"
+    fi
     ./build_gmp.sh "$GMP_TARGET" >&2
 else
     echo "Using system libgmp to satisfy rapidsnark dependencies" >&2
-    system_gmp_package
+    system_gmp_package "$CMAKE_TARGET_PLATFORM"
 fi
 
-PACKAGE_DIR="${RAPIDSNARK_PACKAGE_DIR:-package_arm64}"
-
-rm -rf build_prover_arm64
-mkdir build_prover_arm64
-cd build_prover_arm64
+rm -rf "$BUILD_DIR"
+mkdir "$BUILD_DIR"
+cd "$BUILD_DIR"
 cmake .. \
-    -DTARGET_PLATFORM=aarch64 \
+    -DTARGET_PLATFORM="$CMAKE_TARGET_PLATFORM" \
     -DCMAKE_BUILD_TYPE=Release \
     -DCMAKE_INSTALL_PREFIX="../${PACKAGE_DIR}" \
     -DBUILD_SHARED_LIBS=OFF >&2
diff --git a/testnet/Dockerfile b/testnet/Dockerfile
index 4955e5f..31c49fa 100644
--- a/testnet/Dockerfile
+++ b/testnet/Dockerfile
@@ -82,6 +82,8 @@ LABEL maintainer="augustinas@status.im" \
 
 RUN apt-get update && apt-get install -yq \
     libstdc++6 \
+    libgmp10 \
+    libgomp1 \
     libssl3 \
     ca-certificates \
     && rm -rf /var/lib/apt/lists/*