diff --git a/evaluator/sandbox/basilica_sandbox_manager.py b/evaluator/sandbox/basilica_sandbox_manager.py
new file mode 100644
index 000000000..f07a750bb
--- /dev/null
+++ b/evaluator/sandbox/basilica_sandbox_manager.py
@@ -0,0 +1,87 @@
+"""Basilica Sandbox Manager - adapts basilica SDK to ridges interface."""
+
+import os
+import json
+import shutil
+import tempfile
+from typing import Any, Dict, Callable, Optional
+from dataclasses import dataclass
+
+import basilica
+from basilica import Sandbox, python_sandbox
+from evaluator.models import SandboxResultWithLogs
+
+
+@dataclass
+class SandboxHandle:
+    name: str
+    sandbox: Sandbox
+    script_name: str
+    timeout: int = 3600
+
+
+class BasilicaSandboxManager:
+    """Adapts basilica.Sandbox to ridges SandboxManager interface."""
+    
+    def __init__(self, inference_gateway_url: str = None):
+        api_url = os.environ.get("BASILICA_API_URL", "http://localhost:9080")
+        api_token = os.environ.get("BASILICA_API_TOKEN")
+        if not api_token:
+            raise ValueError("BASILICA_API_TOKEN required")
+        basilica.configure(api_url=api_url, api_key=api_token)
+    
+    def initialize_sandbox(
+        self, *, name: str, script_path: str, input_data: Any = None,
+        env_vars: Dict[str, str] = {}, on_mount: Callable[[str], None] = None,
+        timeout_seconds: int = None
+    ) -> SandboxHandle:
+        script_name = os.path.basename(script_path)
+        sandbox = python_sandbox(runtime="container", env={**env_vars, "PYTHONUNBUFFERED": "1"},
+                                  timeout_seconds=timeout_seconds or 3600)
+        
+        # Upload files from on_mount callback
+        if on_mount:
+            tmp = tempfile.mkdtemp()
+            on_mount(tmp)
+            for root, _, files in os.walk(tmp):
+                for f in files:
+                    local = os.path.join(root, f)
+                    try:
+                        sandbox.files.write(f"/sandbox/{os.path.relpath(local, tmp)}", open(local).read())
+                    except (UnicodeDecodeError, IOError):
+                        pass
+            shutil.rmtree(tmp, ignore_errors=True)
+        
+        sandbox.files.write(f"/sandbox/{script_name}", open(script_path).read())
+        if input_data is not None:
+            sandbox.files.write("/sandbox/input.json", json.dumps(input_data, indent=2))
+        
+        return SandboxHandle(name, sandbox, script_name, timeout_seconds or 3600)
+    
+    def run_sandbox(self, handle: SandboxHandle) -> SandboxResultWithLogs:
+        try:
+            cmd = ["python3", f"/sandbox/{handle.script_name}"]
+            result = handle.sandbox.process.exec(cmd, timeout=handle.timeout)
+            logs = result.stdout + ("\n[STDERR]\n" + result.stderr if result.stderr else "")
+            
+            try:
+                output = json.loads(handle.sandbox.files.read("/sandbox/output.json"))
+            except:
+                output = {"success": False, "error": "Failed to read output.json"}
+            
+            return SandboxResultWithLogs(
+                success=output.get("success", False), output=output.get("output"),
+                error=output.get("error"), traceback=output.get("traceback"), logs=logs
+            )
+        finally:
+            try: handle.sandbox.delete()
+            except: pass
+
+
+def get_sandbox_manager(inference_gateway_url: str = None, backend: str = None):
+    """Factory: returns BasilicaSandboxManager or SandboxManager."""
+    backend = backend or os.environ.get("RIDGES_SANDBOX_BACKEND", "docker")
+    if backend == "basilica":
+        return BasilicaSandboxManager(inference_gateway_url)
+    from evaluator.sandbox.sandbox_manager import SandboxManager
+    return SandboxManager(inference_gateway_url)
diff --git a/pyproject.toml b/pyproject.toml
index 4851fefcd..599c2db78 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,6 +25,10 @@ dependencies = [
     "uvicorn>=0.30.5",
 ]
 
+# NOTE: For basilica sandbox support, install the local SDK:
+#   uv pip install -e ../basilica/crates/basilica-sdk-python
+# The SDK is not yet on PyPI, so we link to it locally.
+
 # Python formatting and linting configuration
 [tool.black]
 line-length = 150
diff --git a/test_basilica_sandbox.py b/test_basilica_sandbox.py
new file mode 100755
index 000000000..f0f604cdf
--- /dev/null
+++ b/test_basilica_sandbox.py
@@ -0,0 +1,165 @@
+#!/usr/bin/env python3
+"""
+Basilica Sandbox Integration Tests
+
+Setup:
+    cd ../basilica-backend && sudo ./scripts/sandbox/local-container-e2e.sh setup
+    export BASILICA_API_URL=http://localhost:9080 BASILICA_API_TOKEN=dev-token
+
+Usage:
+    python test_basilica_sandbox.py              # Quick check
+    python test_basilica_sandbox.py --full       # + concurrent evals
+    python test_basilica_sandbox.py --scale 30   # 30 concurrent evals
+"""
+
+import os, sys, time, json, tempfile, traceback, concurrent.futures
+from uuid import uuid4
+from pathlib import Path
+from threading import Lock
+
+sys.path.insert(0, str(Path(__file__).parent))
+
+import click
+import basilica
+from basilica import python_sandbox
+from evaluator.sandbox.basilica_sandbox_manager import BasilicaSandboxManager
+from evaluator.problem_suites.polyglot.polyglot_suite import POLYGLOT_PY_SUITE
+from models.problem import ProblemTestResultStatus
+
+basilica.configure(
+    api_url=os.environ.get("BASILICA_API_URL", "http://localhost:9080"),
+    api_key=os.environ.get("BASILICA_API_TOKEN", ""),
+)
+
+ok = lambda m: print(f"  ✓ {m}")
+fail = lambda m: print(f"  ✗ {m}")
+section = lambda t: print(f"\n{'─'*60}\n  {t}\n{'─'*60}")
+
+
+def test_sdk():
+    """Test SDK basics."""
+    section("SDK Connection")
+    try:
+        with python_sandbox(runtime="container") as sb:
+            ok(f"Created: {sb.sandbox_id}")
+            assert sb.process.run("print('Hello')").exit_code == 0
+            ok("Code execution")
+            sb.files.write("test.txt", "x")
+            assert sb.files.read("test.txt") == "x"
+            ok("File I/O")
+        ok("Cleanup")
+        return True
+    except Exception as e:
+        fail(str(e)); traceback.print_exc(); return False
+
+
+def test_manager():
+    """Test BasilicaSandboxManager."""
+    section("SandboxManager")
+    script = 'import json; d=json.load(open("/sandbox/input.json")); json.dump({"success":True,"output":d["x"]*2},open("/sandbox/output.json","w"))'
+    
+    with tempfile.NamedTemporaryFile(mode='w', suffix='.py', delete=False) as f:
+        f.write(script); path = f.name
+    try:
+        mgr = BasilicaSandboxManager()
+        h = mgr.initialize_sandbox(name="t", script_path=path, input_data={"x": 21}, timeout_seconds=60)
+        ok(f"Initialized: {h.sandbox.sandbox_id}")
+        r = mgr.run_sandbox(h)
+        assert r.success and r.output == 42
+        ok(f"Result: {r.output}")
+        return True
+    except Exception as e:
+        fail(str(e)); traceback.print_exc(); return False
+    finally:
+        os.unlink(path)
+
+
+def test_polyglot(problem: str = "accumulate-py"):
+    """Test Polyglot evaluation."""
+    section(f"Polyglot: {problem}")
+    if not POLYGLOT_PY_SUITE.has_problem_name(problem):
+        fail(f"Problem '{problem}' not found"); return False
+    try:
+        p = POLYGLOT_PY_SUITE.get_problem(problem)
+        mgr = BasilicaSandboxManager()
+        sb = POLYGLOT_PY_SUITE.initialize_eval_sandbox(mgr, p, uuid4(), p.solution_diff, timeout_seconds=120)
+        ok(f"Sandbox: {sb.sandbox.sandbox_id}")
+        results, _ = POLYGLOT_PY_SUITE.run_eval_sandbox(mgr, sb)
+        passed = sum(1 for t in results if t.status == ProblemTestResultStatus.PASS)
+        failed = sum(1 for t in results if t.status == ProblemTestResultStatus.FAIL)
+        for t in results:
+            print(f"    {'✓' if t.status == ProblemTestResultStatus.PASS else '✗'} {t.name}")
+        ok(f"Tests: {passed} passed, {failed} failed")
+        return failed == 0
+    except Exception as e:
+        fail(str(e)); traceback.print_exc(); return False
+
+
+def test_concurrent(count: int = 10, verbose: bool = True):
+    """Test concurrent evaluations."""
+    section(f"Concurrent: {count}")
+    problems = [POLYGLOT_PY_SUITE.get_problem(list(POLYGLOT_PY_SUITE.problems.keys())[i % len(POLYGLOT_PY_SUITE.problems)]) for i in range(count)]
+    stats = {"ok": 0, "fail": 0, "times": [], "tests": []}
+    lock, t0 = Lock(), time.time()
+    
+    def run(i):
+        p, start = problems[i], time.time()
+        try:
+            mgr = BasilicaSandboxManager()
+            if verbose:
+                with lock: print(f"    [{time.time()-t0:5.1f}s] #{i:02d} {p.name}: init...")
+            sb = POLYGLOT_PY_SUITE.initialize_eval_sandbox(mgr, p, uuid4(), p.solution_diff, timeout_seconds=180)
+            if verbose:
+                with lock: print(f"    [{time.time()-t0:5.1f}s] #{i:02d} {p.name}: run...")
+            results, _ = POLYGLOT_PY_SUITE.run_eval_sandbox(mgr, sb)
+            passed = sum(1 for t in results if t.status == ProblemTestResultStatus.PASS)
+            failed = sum(1 for t in results if t.status == ProblemTestResultStatus.FAIL)
+            success = failed == 0 and passed > 0
+            with lock:
+                stats["ok" if success else "fail"] += 1
+                stats["times"].append(time.time() - start)
+                stats["tests"].append({"p": passed, "f": failed})
+                if verbose: print(f"    [{time.time()-t0:5.1f}s] #{i:02d} {p.name}: {'✓' if success else '✗'} {passed}/{passed+failed} ({time.time()-start:.1f}s)")
+        except Exception as e:
+            with lock:
+                stats["fail"] += 1; stats["times"].append(time.time() - start)
+                if verbose: print(f"    [{time.time()-t0:5.1f}s] #{i:02d} {p.name}: ✗ {str(e)[:40]}")
+    
+    print(f"\n  Running {count} evals...\n")
+    with concurrent.futures.ThreadPoolExecutor(max_workers=min(count, 30)) as ex:
+        list(ex.map(run, range(count)))
+    
+    total = time.time() - t0
+    print(f"\n  {'─'*50}")
+    print(f"  Evals: {stats['ok']}/{count} | Tests: {sum(t['p'] for t in stats['tests'])} passed, {sum(t['f'] for t in stats['tests'])} failed")
+    print(f"  Time: {total:.1f}s total, {sum(stats['times'])/len(stats['times']):.1f}s avg, {count/total:.2f}/sec")
+    rate = stats["ok"] / count * 100 if count else 0
+    (ok if rate >= 80 else fail)(f"{rate:.0f}% success")
+    return rate >= 80
+
+
+@click.command()
+@click.option("--full", is_flag=True, help="Include concurrent evals")
+@click.option("--scale", default=0, type=int, help="N concurrent evals")
+@click.option("--problem", default="accumulate-py", help="Problem name")
+@click.option("--quiet", is_flag=True, help="Less output")
+def main(full, scale, problem, quiet):
+    print("\n" + "=" * 60 + "\n  Basilica Sandbox Tests\n" + "=" * 60)
+    if not os.environ.get("BASILICA_API_TOKEN"):
+        fail("BASILICA_API_TOKEN not set"); sys.exit(1)
+    
+    tests = [("SDK", test_sdk), ("Manager", test_manager), (f"Polyglot({problem})", lambda: test_polyglot(problem))]
+    if full or scale > 0:
+        tests.append((f"Concurrent({scale or 10})", lambda: test_concurrent(scale or 10, not quiet)))
+    
+    results = [(n, f()) for n, f in tests]
+    print("\n" + "=" * 60)
+    for n, p in results: print(f"  {'✓' if p else '✗'} {n}")
+    print("=" * 60)
+    passed = all(p for _, p in results)
+    print(f"  {'✓ All passed' if passed else '✗ Some failed'}")
+    sys.exit(0 if passed else 1)
+
+
+if __name__ == "__main__":
+    main()