diff --git a/bin/temporary_action.js b/bin/temporary_action.js
deleted file mode 100644
index 596566debf57d99a47dfe95d36296cfbbc83ab92..0000000000000000000000000000000000000000
--- a/bin/temporary_action.js
+++ /dev/null
@@ -1,16 +0,0 @@
-const path = require('path');
-const fs = require('fs');
-
-const categories = fs.readdirSync(path.resolve(__dirname, '..', 'src', 'backend', 'public', 'algorithms'));
-for (const category of categories) {
-  if (category.startsWith('.')) continue;
-  const algorithms = fs.readdirSync(path.resolve(__dirname, '..', 'src', 'backend', 'public', 'algorithms', category));
-  for (const algorithm of algorithms) {
-    if (algorithm.startsWith('.')) continue;
-    const dir = path.resolve(__dirname, '..', 'src', 'backend', 'public', 'algorithms', category, algorithm);
-    try {
-      fs.renameSync(path.resolve(dir, 'desc.md'), path.resolve(dir, 'README.md'));
-    } catch (e) {
-    }
-  }
-}
\ No newline at end of file
diff --git a/bin/www b/bin/www
old mode 100644
new mode 100755
diff --git a/package.json b/package.json
index 457f3206306a19b9d5c73728feccb10f50afdd31..2ebbadfd4c89ae4c196492c3ba20c520a850afd3 100644
--- a/package.json
+++ b/package.json
@@ -3,14 +3,12 @@
   "version": "2.0.0",
   "description": "Algorithm Visualizer",
   "scripts": {
-    "postinstall": "docker pull openjdk:8 && docker pull gcc:8.1",
-    "dev": "NODE_ENV=development node bin/www",
-    "start": "NODE_ENV=production node bin/www",
+    "dev": "NODE_ENV=development ./bin/www",
+    "start": "NODE_ENV=production ./bin/www",
     "build": "npm run build:frontend && npm run build:backend",
     "build:frontend": "NODE_ENV=production node ./node_modules/webpack/bin/webpack --bail --progress --config webpack.frontend.config.js",
     "build:backend": "NODE_ENV=production node ./node_modules/webpack/bin/webpack --bail --progress --config webpack.backend.config.js",
-    "lint": "./node_modules/.bin/eslint --fix src",
-    "publish": "npm run lint && npm run build && git add . && git commit && git push"
+    "lint": "./node_modules/.bin/eslint --fix src"
   },
   "repository": {
     "type": "git",
diff --git a/src/backend/controllers/tracers.js b/src/backend/controllers/tracers.js
index e93709c80c93205734c4b7d606792ca3f81e835c..7781381a9d734eff2b28cceb8f57c70c37cc2301 100644
--- a/src/backend/controllers/tracers.js
+++ b/src/backend/controllers/tracers.js
@@ -9,51 +9,36 @@ import { CompileError, RuntimeError } from '/common/error';
 const router = express.Router();
 
 const repoPath = path.resolve(__dirname, '..', 'public', 'tracers');
-const getLibsPath = (...args) => path.resolve(repoPath, 'libs', ...args);
 const getCodesPath = (...args) => path.resolve(__dirname, '..', 'public', 'codes', ...args);
 
 const buildRelease = release => (
   fs.pathExistsSync(repoPath) ?
     execute(`git fetch && ! git diff-index --quiet ${release.target_commitish}`, repoPath) :
     execute(`git clone git@github.com:algorithm-visualizer/tracers ${repoPath}`, __dirname)
-).then(() => execute(`git reset --hard ${release.target_commitish} && npm install && npm run build`, repoPath));
+).then(() => execute(`git reset --hard ${release.target_commitish} && npm install && npm run build && ./bin/build`, repoPath));
 
 GitHubApi.getLatestRelease('algorithm-visualizer', 'tracers').then(buildRelease);
 // TODO: build release when webhooked
 
 const getJsWorker = (req, res, next) => {
-  res.sendFile(getLibsPath('js', 'tracers.js'));
+  res.sendFile(path.resolve(repoPath, 'src', 'languages', 'js', 'tracers', 'build', 'tracers.js'));
 };
 
-const executeInDocker = (imageId, ext, srcPath, command) => {
-  // TODO: memory limit + time limit + space limit?
-  const libsPath = getLibsPath(ext);
-  const dockerCommand = [
-    `docker run --rm`,
-    '-w=/usr/judge',
-    `-v=${libsPath}:/usr/bin/tracers:ro`,
-    `-v=${srcPath}:/usr/judge:rw`,
-    `-e MAX_TRACES=${1e6} -e MAX_TRACERS=${1e2}`,
-    imageId,
-  ].join(' ');
-  return execute(`${dockerCommand} ${command}`, repoPath, { stdout: null, stderr: null });
-};
-
-const trace = ({ ext, imageId, compileCommand, runCommand }) => (req, res, next) => {
+const trace = lang => (req, res, next) => {
   const { code } = req.body;
-  const srcPath = getCodesPath(uuid.v4());
-  fs.outputFile(path.resolve(srcPath, `Main.${ext}`), code)
-    .then(() => executeInDocker(imageId, ext, srcPath, compileCommand)
+  const tempPath = getCodesPath(uuid.v4());
+  fs.outputFile(path.resolve(tempPath, `Main.${lang}`), code)
+    .then(() => execute(`LANG=${lang} TEMP_PATH=${tempPath} ./bin/compile`, repoPath, { stdout: null, stderr: null })
       .catch(error => {
         throw new CompileError(error);
       }))
-    .then(() => executeInDocker(imageId, ext, srcPath, runCommand)
+    .then(() => execute(`LANG=${lang} TEMP_PATH=${tempPath} ./bin/run`, repoPath, { stdout: null, stderr: null })
       .catch(error => {
         throw new RuntimeError(error);
       }))
-    .then(() => res.sendFile(path.resolve(srcPath, 'traces.json')))
+    .then(() => res.sendFile(path.resolve(tempPath, 'traces.json')))
     .catch(next)
-    .finally(() => fs.remove(srcPath));
+    .finally(() => fs.remove(tempPath));
 };
 
 
@@ -61,19 +46,9 @@ router.route('/js')
   .get(getJsWorker);
 
 router.route('/java')
-  .post(trace({
-    ext: 'java',
-    imageId: 'openjdk:8',
-    compileCommand: 'javac -cp /usr/bin/tracers/tracers.jar Main.java',
-    runCommand: 'java -cp /usr/bin/tracers/tracers.jar:. Main',
-  }));
+  .post(trace('java'));
 
 router.route('/cpp')
-  .post(trace({
-    ext: 'cpp',
-    imageId: 'gcc:8.1',
-    compileCommand: 'g++ Main.cpp -o Main -O2 -std=c++11 -L/usr/bin/tracers/lib -l:tracers.a -I/usr/bin/tracers/include',
-    runCommand: './Main',
-  }));
+  .post(trace('cpp'));
 
 export default router;
\ No newline at end of file