diff --git a/build.zig b/build.zig
new file mode 100644
index 00000000..e3720861
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,192 @@
+const std = @import("std");
+const builtin = @import("builtin");
+const system_sdk = @import("libs/glfw/system_sdk.zig");
+const glfw = @import("libs/glfw/build.zig");
+const ecs = @import("libs/ecs/build.zig");
+const freetype = @import("libs/freetype/build.zig");
+const basisu = @import("libs/basisu/build.zig");
+const sysjs = @import("libs/sysjs/build.zig");
+const earcut = @import("libs/earcut/build.zig");
+const gamemode = @import("libs/gamemode/build.zig");
+const model3d = @import("libs/model3d/build.zig");
+const wasmserve = @import("tools/wasmserve/wasmserve.zig");
+const gpu_dawn = @import("libs/gpu-dawn/sdk.zig").Sdk(.{
+    .glfw_include_dir = sdkPath("/libs/glfw/upstream/glfw/include"),
+    .system_sdk = system_sdk,
+});
+const gpu = @import("libs/gpu/sdk.zig").Sdk(.{
+    .gpu_dawn = gpu_dawn,
+});
+const sysaudio = @import("libs/sysaudio/sdk.zig").Sdk(.{
+    .system_sdk = system_sdk,
+    .sysjs = sysjs,
+});
+const core = @import("libs/core/sdk.zig").Sdk(.{
+    .gpu = gpu,
+    .gpu_dawn = gpu_dawn,
+    .glfw = glfw,
+    .gamemode = gamemode,
+    .wasmserve = wasmserve,
+    .sysjs = sysjs,
+});
+
+pub const pkg = std.build.Pkg{
+    .name = "mach",
+    .source = .{ .path = sdkPath("/src/main.zig") },
+    .dependencies = &.{ core.pkg, ecs.pkg, sysaudio.pkg, earcut.pkg },
+};
+
+pub const Options = struct {
+    core: core.Options = .{},
+    sysaudio: sysaudio.Options = .{},
+    freetype: freetype.Options = .{},
+};
+
+pub fn build(b: *std.build.Builder) !void {
+    const mode = b.standardReleaseOptions();
+    const target = b.standardTargetOptions(.{});
+
+    const gpu_dawn_options = gpu_dawn.Options{
+        .from_source = b.option(bool, "dawn-from-source", "Build Dawn from source") orelse false,
+        .debug = b.option(bool, "dawn-debug", "Use a debug build of Dawn") orelse false,
+    };
+    const options = Options{ .core = .{ .gpu_dawn_options = gpu_dawn_options } };
+
+    if (target.getCpuArch() != .wasm32) {
+        const all_tests_step = b.step("test", "Run library tests");
+        const core_test_step = b.step("test-core", "Run Core library tests");
+        const ecs_test_step = b.step("test-ecs", "Run ECS library tests");
+        const freetype_test_step = b.step("test-freetype", "Run Freetype library tests");
+        const basisu_test_step = b.step("test-basisu", "Run Basis-Universal library tests");
+        const sysaudio_test_step = b.step("test-sysaudio", "Run sysaudio library tests");
+        const model3d_test_step = b.step("test-model3d", "Run Model3D library tests");
+        const mach_test_step = b.step("test-mach", "Run Engine library tests");
+
+        core_test_step.dependOn(&core.testStep(b, mode, target).step);
+        freetype_test_step.dependOn(&freetype.testStep(b, mode, target).step);
+        ecs_test_step.dependOn(&ecs.testStep(b, mode, target).step);
+        basisu_test_step.dependOn(&basisu.testStep(b, mode, target).step);
+        sysaudio_test_step.dependOn(&sysaudio.testStep(b, mode, target).step);
+        model3d_test_step.dependOn(&model3d.testStep(b, mode, target).step);
+        mach_test_step.dependOn(&testStep(b, mode, target).step);
+
+        all_tests_step.dependOn(core_test_step);
+        all_tests_step.dependOn(ecs_test_step);
+        all_tests_step.dependOn(basisu_test_step);
+        all_tests_step.dependOn(freetype_test_step);
+        all_tests_step.dependOn(sysaudio_test_step);
+        all_tests_step.dependOn(model3d_test_step);
+        all_tests_step.dependOn(mach_test_step);
+
+        const shaderexp_app = try App.init(
+            b,
+            .{
+                .name = "shaderexp",
+                .src = "shaderexp/main.zig",
+                .target = target,
+                .mode = mode,
+            },
+        );
+        try shaderexp_app.link(options);
+        shaderexp_app.install();
+
+        const shaderexp_compile_step = b.step("shaderexp", "Compile shaderexp");
+        shaderexp_compile_step.dependOn(&shaderexp_app.getInstallStep().?.step);
+
+        const shaderexp_run_cmd = try shaderexp_app.run();
+        shaderexp_run_cmd.dependOn(&shaderexp_app.getInstallStep().?.step);
+        const shaderexp_run_step = b.step("run-shaderexp", "Run shaderexp");
+        shaderexp_run_step.dependOn(shaderexp_run_cmd);
+    }
+
+    const compile_all = b.step("compile-all", "Compile Mach");
+    compile_all.dependOn(b.getInstallStep());
+}
+
+fn testStep(b: *std.build.Builder, mode: std.builtin.Mode, target: std.zig.CrossTarget) *std.build.RunStep {
+    const main_tests = b.addTestExe("mach-tests", "src/main.zig");
+    main_tests.setBuildMode(mode);
+    main_tests.setTarget(target);
+    for (pkg.dependencies.?) |dependency| {
+        main_tests.addPackage(dependency);
+    }
+    main_tests.install();
+    return main_tests.run();
+}
+
+pub const App = struct {
+    core: core.App,
+    use_freetype: ?[]const u8 = null,
+    use_model3d: bool = false,
+
+    pub const InitError = core.App.InitError;
+    pub const LinkError = core.App.LinkError;
+    pub const RunError = core.App.RunError;
+
+    pub fn init(
+        b: *std.build.Builder,
+        options: struct {
+            name: []const u8,
+            src: []const u8,
+            target: std.zig.CrossTarget,
+            mode: std.builtin.Mode,
+            deps: ?[]const std.build.Pkg = null,
+            res_dirs: ?[]const []const u8 = null,
+            watch_paths: ?[]const []const u8 = null,
+
+            /// If set, freetype will be linked and can be imported using this name.
+            // TODO(build-system): name is currently not used / always "freetype"
+            use_freetype: ?[]const u8 = null,
+            use_model3d: bool = false,
+        },
+    ) InitError!App {
+        var deps = std.ArrayList(std.build.Pkg).init(b.allocator);
+        if (options.deps) |v| try deps.appendSlice(v);
+        try deps.append(pkg);
+        try deps.append(sysaudio.pkg);
+        if (options.use_freetype) |_| try deps.append(freetype.pkg);
+
+        return .{
+            .core = try core.App.init(b, .{
+                .name = options.name,
+                .src = options.src,
+                .target = options.target,
+                .mode = options.mode,
+                .deps = deps.items,
+                .res_dirs = options.res_dirs,
+                .watch_paths = options.watch_paths,
+            }),
+            .use_freetype = options.use_freetype,
+            .use_model3d = options.use_model3d,
+        };
+    }
+
+    pub fn link(app: *const App, options: Options) LinkError!void {
+        try app.core.link(options.core);
+        sysaudio.link(app.core.b, app.core.step, options.sysaudio);
+        if (app.use_freetype) |_| freetype.link(app.core.b, app.core.step, options.freetype);
+        if (app.use_model3d) {
+            model3d.link(app.core.b, app.core.step, app.core.step.target);
+        }
+    }
+
+    pub fn install(app: *const App) void {
+        app.core.install();
+    }
+
+    pub fn run(app: *const App) RunError!*std.build.Step {
+        return try app.core.run();
+    }
+
+    pub fn getInstallStep(app: *const App) ?*std.build.InstallArtifactStep {
+        return app.core.getInstallStep();
+    }
+};
+
+fn sdkPath(comptime suffix: []const u8) []const u8 {
+    if (suffix[0] != '/') @compileError("suffix must be an absolute path");
+    return comptime blk: {
+        const root_dir = std.fs.path.dirname(@src().file) orelse ".";
+        break :blk root_dir ++ suffix;
+    };
+}
diff --git a/libs/core/src/engine.zig b/src/engine.zig
similarity index 93%
rename from libs/core/src/engine.zig
rename to src/engine.zig
index c47a6c83..a598c844 100644
--- a/libs/core/src/engine.zig
+++ b/src/engine.zig
@@ -1,7 +1,8 @@
+const Core = @import("core").Core;
+const gpu = @import("core").gpu;
+
 const std = @import("std");
-pub const Core = @import("Core.zig");
-pub const gpu = @import("gpu");
-pub const ecs = @import("ecs");
+const ecs = @import("ecs");
 
 /// The Mach engine ECS module. This enables access to `engine.get(.mach, .core)` `*Core` APIs, as
 /// to for example `.setOptions(.{.title = "foobar"})`, or to access the GPU device via
diff --git a/src/main.zig b/src/main.zig
index 2d84c499..45c8c4f3 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1,10 +1,14 @@
-pub usingnamespace @import("entry.zig");
-pub const Core = @import("Core.zig");
-pub const Timer = @import("Timer.zig");
-pub const gpu = @import("gpu");
+const core = @import("core");
+pub const GPUInterface = core.GPUInterface;
+pub const scope_levels = core.scope_levels;
+pub const log_level = core.log_level;
+pub const Core = core.Core;
+pub const Timer = core.Timer;
+pub const gpu = core.gpu;
+pub const sysjs = core.sysjs;
+
 pub const ecs = @import("ecs");
 pub const sysaudio = @import("sysaudio");
-pub const sysjs = @import("sysjs");
 pub const earcut = @import("earcut");
 pub const gfx = @import("gfx/util.zig");
 pub const ResourceManager = @import("resource/ResourceManager.zig");