diff --git a/src/womm/certify.py b/src/womm/certify.py
index efade16..800e019 100644
--- a/src/womm/certify.py
+++ b/src/womm/certify.py
@@ -3,12 +3,49 @@
 from __future__ import annotations
 
 import ast
+import json
 import os
 import subprocess
 from dataclasses import dataclass, field
 from enum import IntEnum
 from pathlib import Path
 
+# Directories to skip when walking the project tree.
+_IGNORE_DIRS = {
+    ".git", "node_modules", "__pycache__", ".venv", "venv",
+    "target", ".tox", ".eggs", "dist", "build", ".mypy_cache",
+}
+
+_EXT_TO_LANG: dict[str, str] = {
+    ".py": "python",
+    ".js": "javascript", ".mjs": "javascript", ".cjs": "javascript",
+    ".jsx": "javascript",
+    ".ts": "typescript", ".tsx": "typescript",
+    ".go": "go",
+    ".rs": "rust",
+    ".java": "java",
+    ".rb": "ruby",
+    ".c": "c", ".h": "c",
+    ".cpp": "cpp", ".cc": "cpp", ".cxx": "cpp", ".hpp": "cpp",
+    ".cs": "csharp",
+    ".kt": "kotlin", ".kts": "kotlin",
+    ".sh": "shell", ".bash": "shell",
+}
+
+
+def _detect_languages(path: Path) -> set[str]:
+    """Return the set of programming languages present in the project."""
+    langs: set[str] = set()
+    for f in path.rglob("*"):
+        if not f.is_file():
+            continue
+        if any(part in _IGNORE_DIRS for part in f.parts):
+            continue
+        lang = _EXT_TO_LANG.get(f.suffix.lower())
+        if lang:
+            langs.add(lang)
+    return langs
+
 
 class Level(IntEnum):
     """WOMM certification levels (Section 4.2)."""
@@ -81,12 +118,7 @@ def _check_project_exists(path: Path) -> CheckResult:
 
 
 def _check_has_source_files(path: Path) -> CheckResult:
-    extensions = {".py", ".js", ".ts", ".c", ".cpp", ".go", ".rs", ".java", ".rb", ".sh"}
-    found = any(
-        f.suffix in extensions
-        for f in path.rglob("*")
-        if f.is_file() and ".git" not in f.parts
-    )
+    found = bool(_detect_languages(path))
     return CheckResult(
         name="Contains source code",
         passed=found,
@@ -99,45 +131,232 @@ def _check_has_source_files(path: Path) -> CheckResult:
     )
 
 
-def _check_python_syntax(path: Path) -> CheckResult:
-    py_files = [
-        f for f in path.rglob("*.py")
-        if f.is_file() and ".git" not in f.parts
-    ]
-    if not py_files:
+def _check_syntax(path: Path) -> CheckResult:
+    """Check syntax/compilability for all detected languages."""
+    langs = _detect_languages(path)
+
+    if not langs:
         return CheckResult(
-            name="Python syntax check",
+            name="Syntax check",
             passed=True,
-            message="No Python files to check. Blissful ignorance achieved.",
+            message="No source files to check. Blissful ignorance achieved.",
             level=Level.BRONZE,
         )
+
     errors: list[str] = []
-    for py_file in py_files:
+    checked: list[str] = []
+    skipped: list[str] = []
+
+    # --- Python ---
+    if "python" in langs:
+        py_files = [
+            f for f in path.rglob("*.py")
+            if f.is_file() and not any(p in _IGNORE_DIRS for p in f.parts)
+        ]
+        checked.append("Python")
+        for py_file in py_files:
+            try:
+                ast.parse(py_file.read_text(encoding="utf-8"), filename=str(py_file))
+            except SyntaxError as exc:
+                errors.append(f"{py_file.name}:{exc.lineno}: {exc.msg}")
+
+    # --- TypeScript (tsc --noEmit) ---
+    if "typescript" in langs and (path / "tsconfig.json").exists():
         try:
-            ast.parse(py_file.read_text(encoding="utf-8"), filename=str(py_file))
-        except SyntaxError as exc:
-            errors.append(f"{py_file.name}:{exc.lineno}: {exc.msg}")
+            r = subprocess.run(
+                ["tsc", "--noEmit"],
+                cwd=path, capture_output=True, text=True, timeout=60,
+            )
+            checked.append("TypeScript")
+            if r.returncode != 0:
+                snippet = (r.stdout + r.stderr).strip().split("\n")[0]
+                errors.append(f"TypeScript: {snippet}")
+        except FileNotFoundError:
+            skipped.append("TypeScript (tsc not found)")
+        except subprocess.TimeoutExpired:
+            errors.append("TypeScript: tsc timed out")
+
+    # --- JavaScript (node --check) ---
+    elif "javascript" in langs:
+        js_files = [
+            f for f in path.rglob("*.js")
+            if f.is_file() and not any(p in _IGNORE_DIRS for p in f.parts)
+        ][:20]
+        if js_files:
+            try:
+                checked.append("JavaScript")
+                for js_file in js_files:
+                    r = subprocess.run(
+                        ["node", "--check", str(js_file)],
+                        capture_output=True, text=True, timeout=10,
+                    )
+                    if r.returncode != 0:
+                        snippet = r.stderr.strip().split("\n")[0]
+                        errors.append(f"{js_file.name}: {snippet}")
+            except FileNotFoundError:
+                checked.remove("JavaScript")
+                skipped.append("JavaScript (node not found)")
+
+    # --- Go (go build) ---
+    if "go" in langs and (path / "go.mod").exists():
+        try:
+            r = subprocess.run(
+                ["go", "build", "./..."],
+                cwd=path, capture_output=True, text=True, timeout=120,
+            )
+            checked.append("Go")
+            if r.returncode != 0:
+                snippet = r.stderr.strip().split("\n")[0]
+                errors.append(f"Go: {snippet}")
+        except FileNotFoundError:
+            skipped.append("Go (go not found)")
+        except subprocess.TimeoutExpired:
+            errors.append("Go: build timed out")
+
+    # --- Rust (cargo check) ---
+    if "rust" in langs and (path / "Cargo.toml").exists():
+        try:
+            r = subprocess.run(
+                ["cargo", "check", "--quiet"],
+                cwd=path, capture_output=True, text=True, timeout=180,
+            )
+            checked.append("Rust")
+            if r.returncode != 0:
+                snippet = r.stderr.strip().split("\n")[0]
+                errors.append(f"Rust: {snippet}")
+        except FileNotFoundError:
+            skipped.append("Rust (cargo not found)")
+        except subprocess.TimeoutExpired:
+            errors.append("Rust: cargo check timed out")
+
+    # --- Ruby (ruby -c) ---
+    if "ruby" in langs:
+        rb_files = [
+            f for f in path.rglob("*.rb")
+            if f.is_file() and not any(p in _IGNORE_DIRS for p in f.parts)
+        ][:20]
+        if rb_files:
+            try:
+                checked.append("Ruby")
+                for rb_file in rb_files:
+                    r = subprocess.run(
+                        ["ruby", "-c", str(rb_file)],
+                        capture_output=True, text=True, timeout=10,
+                    )
+                    if r.returncode != 0:
+                        snippet = r.stderr.strip().split("\n")[0]
+                        errors.append(f"{rb_file.name}: {snippet}")
+            except FileNotFoundError:
+                if "Ruby" in checked:
+                    checked.remove("Ruby")
+                skipped.append("Ruby (ruby not found)")
+
+    # --- C / C++ (make build) ---
+    _makefiles = [path / name for name in ("Makefile", "GNUmakefile", "makefile")]
+    if ("c" in langs or "cpp" in langs) and any(m.exists() for m in _makefiles):
+        try:
+            r = subprocess.run(
+                ["make", "build"],
+                cwd=path, capture_output=True, text=True, timeout=120,
+            )
+            if r.returncode == 0:
+                checked.append("C/C++")
+            elif "No rule to make target" in (r.stdout + r.stderr):
+                skipped.append("C/C++ (no 'build' target in Makefile)")
+            else:
+                checked.append("C/C++")
+                snippet = (r.stdout + r.stderr).strip().split("\n")[-1]
+                errors.append(f"C/C++: {snippet}")
+        except FileNotFoundError:
+            skipped.append("C/C++ (make not found)")
+        except subprocess.TimeoutExpired:
+            errors.append("C/C++: make build timed out")
+
+    lang_str = ", ".join(checked) if checked else ", ".join(sorted(langs))
+    skip_note = f" (skipped: {', '.join(skipped)})" if skipped else ""
+
+    if errors:
+        return CheckResult(
+            name="Syntax check",
+            passed=False,
+            message=f"Syntax errors in {lang_str}{skip_note} ({len(errors)} issue(s)): {'; '.join(errors[:3])}",
+            level=Level.BRONZE,
+        )
     return CheckResult(
-        name="Python syntax check",
-        passed=len(errors) == 0,
-        message=(
-            "All Python files parse cleanly. The AST smiles upon you."
-            if not errors
-            else f"Syntax errors found ({len(errors)}): {'; '.join(errors[:3])}"
-        ),
+        name="Syntax check",
+        passed=True,
+        message=f"All {lang_str} source parses cleanly{skip_note}. The AST smiles upon you.",
         level=Level.BRONZE,
     )
 
 
+def _is_visible(f: Path) -> bool:
+    return not any(part in _IGNORE_DIRS for part in f.parts)
+
+
 def _check_tests_exist(path: Path) -> CheckResult:
-    test_indicators = [
-        path / "tests",
-        path / "test",
-        *path.rglob("test_*.py"),
-        *path.rglob("*_test.py"),
-        *path.rglob("tests.py"),
-    ]
-    found = any(p.exists() for p in test_indicators)
+    def rglob_visible(pattern: str) -> list[Path]:
+        return [f for f in path.rglob(pattern) if _is_visible(f)]
+
+    # Python
+    python_test = (
+        (path / "tests").is_dir()
+        or (path / "test").is_dir()
+        or bool(rglob_visible("test_*.py"))
+        or bool(rglob_visible("*_test.py"))
+        or bool(rglob_visible("tests.py"))
+    )
+    # JavaScript / TypeScript
+    js_test = (
+        any(
+            f for f in path.rglob("*")
+            if f.is_file() and _is_visible(f)
+            and f.name.endswith((".test.js", ".spec.js", ".test.ts", ".spec.ts",
+                                  ".test.jsx", ".spec.jsx", ".test.tsx", ".spec.tsx"))
+        )
+        or any(
+            d for d in path.rglob("__tests__")
+            if d.is_dir() and _is_visible(d)
+        )
+    )
+    # Go
+    go_test = bool(rglob_visible("*_test.go"))
+    # Rust — tests/ subdir or inline test modules
+    rust_test = bool(
+        f for f in path.rglob("*.rs")
+        if f.is_file() and _is_visible(f) and "tests" in f.parts
+    ) or (
+        (path / "tests").is_dir()
+        and any((path / "tests").rglob("*.rs"))
+    )
+    # Java
+    java_test = (
+        (path / "src" / "test").exists()
+        or bool(rglob_visible("*Test.java"))
+        or bool(rglob_visible("*Tests.java"))
+        or bool(rglob_visible("*Spec.java"))
+    )
+    # Ruby
+    ruby_test = (
+        (path / "spec").is_dir()
+        or bool(rglob_visible("*_spec.rb"))
+        or bool(rglob_visible("*_test.rb"))
+    )
+    # C / C++ — Makefile with a 'test' target, or conventional test file patterns
+    _makefiles = [path / name for name in ("Makefile", "GNUmakefile", "makefile")]
+    c_test = (
+        any(m.exists() for m in _makefiles)
+        and (
+            bool(rglob_visible("test_*.c"))
+            or bool(rglob_visible("*_test.c"))
+            or bool(rglob_visible("test_*.cpp"))
+            or bool(rglob_visible("*_test.cpp"))
+            or (path / "tests").is_dir()
+            or (path / "test").is_dir()
+        )
+    )
+
+    found = python_test or js_test or go_test or rust_test or java_test or ruby_test or c_test
     return CheckResult(
         name="Test suite exists",
         passed=found,
@@ -151,43 +370,156 @@ def _check_tests_exist(path: Path) -> CheckResult:
 
 
 def _check_tests_pass(path: Path) -> CheckResult:
-    # Try pytest, then unittest
-    for cmd in (["python", "-m", "pytest", "-x", "-q"], ["python", "-m", "unittest", "discover", "-s", "."]):
+    """Run all applicable test suites and report combined results."""
+    passed_runners: list[str] = []
+    failed_runners: list[str] = []
+
+    # --- Go ---
+    if (path / "go.mod").exists():
         try:
-            result = subprocess.run(
-                cmd,
-                cwd=path,
-                capture_output=True,
-                text=True,
-                timeout=120,
+            r = subprocess.run(
+                ["go", "test", "./..."],
+                cwd=path, capture_output=True, text=True, timeout=300,
             )
-            if result.returncode == 0:
-                return CheckResult(
-                    name="Tests pass",
-                    passed=True,
-                    message="All tests pass. On this machine, at least.",
-                    level=Level.SILVER,
-                )
-            elif result.returncode == 5 and "pytest" in cmd[2]:
-                # pytest exit code 5 = no tests collected
-                continue
+            if r.returncode == 0:
+                passed_runners.append("Go")
             else:
-                snippet = (result.stdout + result.stderr).strip().split("\n")[-1]
-                return CheckResult(
-                    name="Tests pass",
-                    passed=False,
-                    message=f"Tests failed. {snippet}",
-                    level=Level.SILVER,
+                snippet = (r.stdout + r.stderr).strip().split("\n")[-1]
+                failed_runners.append(f"Go: {snippet}")
+        except FileNotFoundError:
+            pass  # go not installed — skip
+        except subprocess.TimeoutExpired:
+            failed_runners.append("Go: timed out")
+
+    # --- Rust ---
+    if (path / "Cargo.toml").exists():
+        try:
+            r = subprocess.run(
+                ["cargo", "test", "--quiet"],
+                cwd=path, capture_output=True, text=True, timeout=300,
+            )
+            if r.returncode == 0:
+                passed_runners.append("Rust")
+            else:
+                snippet = (r.stdout + r.stderr).strip().split("\n")[-1]
+                failed_runners.append(f"Rust: {snippet}")
+        except FileNotFoundError:
+            pass
+        except subprocess.TimeoutExpired:
+            failed_runners.append("Rust: timed out")
+
+    # --- Node.js (npm test) ---
+    pkg_json = path / "package.json"
+    if pkg_json.exists():
+        try:
+            scripts = json.loads(pkg_json.read_text(encoding="utf-8")).get("scripts", {})
+            if "test" in scripts:
+                r = subprocess.run(
+                    ["npm", "test"],
+                    cwd=path, capture_output=True, text=True, timeout=120,
                 )
+                if r.returncode == 0:
+                    passed_runners.append("Node.js")
+                else:
+                    snippet = (r.stdout + r.stderr).strip().split("\n")[-1]
+                    failed_runners.append(f"Node.js: {snippet}")
+        except (FileNotFoundError, json.JSONDecodeError):
+            pass
+        except subprocess.TimeoutExpired:
+            failed_runners.append("Node.js: timed out")
+
+    # --- Maven ---
+    if (path / "pom.xml").exists():
+        try:
+            r = subprocess.run(
+                ["mvn", "test", "-q"],
+                cwd=path, capture_output=True, text=True, timeout=300,
+            )
+            if r.returncode == 0:
+                passed_runners.append("Maven")
+            else:
+                snippet = (r.stdout + r.stderr).strip().split("\n")[-1]
+                failed_runners.append(f"Maven: {snippet}")
+        except FileNotFoundError:
+            pass
+        except subprocess.TimeoutExpired:
+            failed_runners.append("Maven: timed out")
+
+    # --- Gradle ---
+    if (path / "build.gradle").exists() or (path / "build.gradle.kts").exists():
+        gradle_cmd = "./gradlew" if (path / "gradlew").exists() else "gradle"
+        try:
+            r = subprocess.run(
+                [gradle_cmd, "test"],
+                cwd=path, capture_output=True, text=True, timeout=300,
+            )
+            if r.returncode == 0:
+                passed_runners.append("Gradle")
+            else:
+                snippet = (r.stdout + r.stderr).strip().split("\n")[-1]
+                failed_runners.append(f"Gradle: {snippet}")
+        except FileNotFoundError:
+            pass
+        except subprocess.TimeoutExpired:
+            failed_runners.append("Gradle: timed out")
+
+    # --- C / C++ (make test) ---
+    _makefiles = [path / name for name in ("Makefile", "GNUmakefile", "makefile")]
+    _langs = _detect_languages(path)
+    if ("c" in _langs or "cpp" in _langs) and any(m.exists() for m in _makefiles):
+        try:
+            r = subprocess.run(
+                ["make", "test"],
+                cwd=path, capture_output=True, text=True, timeout=120,
+            )
+            if r.returncode == 0:
+                passed_runners.append("C/C++ (make test)")
+            elif "No rule to make target" in (r.stdout + r.stderr):
+                pass  # no test target — skip gracefully
+            else:
+                snippet = (r.stdout + r.stderr).strip().split("\n")[-1]
+                failed_runners.append(f"C/C++: {snippet}")
+        except FileNotFoundError:
+            pass  # make not installed — skip
+        except subprocess.TimeoutExpired:
+            failed_runners.append("C/C++: make test timed out")
+
+    # --- Python (pytest, then unittest) ---
+    for cmd in (
+        ["python", "-m", "pytest", "-x", "-q"],
+        ["python", "-m", "unittest", "discover", "-s", "."],
+    ):
+        try:
+            r = subprocess.run(cmd, cwd=path, capture_output=True, text=True, timeout=120)
+            if r.returncode == 0:
+                passed_runners.append("Python")
+                break
+            elif r.returncode == 5 and "pytest" in cmd[2]:
+                continue  # no tests collected — try unittest
+            else:
+                snippet = (r.stdout + r.stderr).strip().split("\n")[-1]
+                failed_runners.append(f"Python: {snippet}")
+                break
         except FileNotFoundError:
             continue
         except subprocess.TimeoutExpired:
-            return CheckResult(
-                name="Tests pass",
-                passed=False,
-                message="Tests timed out after 120s. The machine grew weary.",
-                level=Level.SILVER,
-            )
+            failed_runners.append("Python: timed out")
+            break
+
+    if failed_runners:
+        return CheckResult(
+            name="Tests pass",
+            passed=False,
+            message=f"Test failures detected: {'; '.join(failed_runners[:3])}",
+            level=Level.SILVER,
+        )
+    if passed_runners:
+        return CheckResult(
+            name="Tests pass",
+            passed=True,
+            message=f"All {', '.join(passed_runners)} tests pass. On this machine, at least.",
+            level=Level.SILVER,
+        )
     return CheckResult(
         name="Tests pass",
         passed=False,
@@ -300,7 +632,7 @@ def _check_git_clean(path: Path) -> CheckResult:
 ALL_CHECKS = [
     _check_project_exists,
     _check_has_source_files,
-    _check_python_syntax,
+    _check_syntax,
     _check_tests_exist,
     _check_tests_pass,
     _check_readme_exists,
diff --git a/src/womm_certification.egg-info/SOURCES.txt b/src/womm_certification.egg-info/SOURCES.txt
index e73ec4e..d3ee30f 100644
--- a/src/womm_certification.egg-info/SOURCES.txt
+++ b/src/womm_certification.egg-info/SOURCES.txt
@@ -3,6 +3,9 @@ README.md
 WOMM-CERTIFICATE.txt
 WOMM-STANDARD-001.md
 pyproject.toml
+assets/womm-seal-bronze.svg
+assets/womm-seal-gold.svg
+assets/womm-seal-platinum.svg
 assets/womm-seal.svg
 src/womm/__init__.py
 src/womm/badge.py
diff --git a/tests/test_certify.py b/tests/test_certify.py
index a7b671d..89c0541 100644
--- a/tests/test_certify.py
+++ b/tests/test_certify.py
@@ -12,7 +12,7 @@ from womm.certify import (
     certify,
     _check_has_source_files,
     _check_project_exists,
-    _check_python_syntax,
+    _check_syntax,
     _check_readme_exists,
     _check_no_todo_comments,
 )
@@ -76,13 +76,13 @@ class TestIndividualChecks:
         result = _check_has_source_files(empty_project)
         assert not result.passed
 
-    def test_python_syntax_pass(self, bronze_project: Path) -> None:
-        result = _check_python_syntax(bronze_project)
+    def test_syntax_pass(self, bronze_project: Path) -> None:
+        result = _check_syntax(bronze_project)
         assert result.passed
 
-    def test_python_syntax_fail(self, tmp_path: Path) -> None:
+    def test_syntax_fail(self, tmp_path: Path) -> None:
         (tmp_path / "bad.py").write_text("def oops(\n")
-        result = _check_python_syntax(tmp_path)
+        result = _check_syntax(tmp_path)
         assert not result.passed
 
     def test_readme_exists_pass(self, tmp_path: Path) -> None: