diff --git a/src/routes/tests.ts b/src/routes/tests.ts
new file mode 100644
index 0000000..c704f38
--- /dev/null
+++ b/src/routes/tests.ts
@@ -0,0 +1,185 @@
+import type { FastifyInstance } from 'fastify';
+import { LlmService } from '../services/llm/llm.service.js';
+import { QuestionService } from '../services/questions/question.service.js';
+import { TestsService } from '../services/tests/tests.service.js';
+import { notFound } from '../utils/errors.js';
+import type { CreateTestInput } from '../services/tests/tests.service.js';
+import type { TestSnapshot } from '../services/tests/tests.service.js';
+
+const STACKS = ['html', 'css', 'js', 'ts', 'react', 'vue', 'nodejs', 'git', 'web_basics'] as const;
+const LEVELS = ['basic', 'beginner', 'intermediate', 'advanced', 'expert'] as const;
+
+const createTestSchema = {
+  body: {
+    type: 'object',
+    required: ['stack', 'level', 'questionCount'],
+    properties: {
+      stack: { type: 'string', enum: STACKS },
+      level: { type: 'string', enum: LEVELS },
+      questionCount: { type: 'integer', minimum: 1, maximum: 50 },
+      mode: { type: 'string', enum: ['fixed', 'infinite', 'marathon'] },
+    },
+    additionalProperties: false,
+  },
+};
+
+const testIdParamsSchema = {
+  params: {
+    type: 'object',
+    required: ['testId'],
+    properties: {
+      testId: { type: 'string', format: 'uuid' },
+    },
+  },
+};
+
+const answerSchema = {
+  params: {
+    type: 'object',
+    required: ['testId'],
+    properties: {
+      testId: { type: 'string', format: 'uuid' },
+    },
+  },
+  body: {
+    type: 'object',
+    required: ['questionId', 'answer'],
+    properties: {
+      questionId: { type: 'string', format: 'uuid' },
+      answer: {
+        oneOf: [
+          { type: 'string' },
+          { type: 'array', items: { type: 'string' } },
+        ],
+      },
+    },
+    additionalProperties: false,
+  },
+};
+
+const historyQuerySchema = {
+  querystring: {
+    type: 'object',
+    properties: {
+      limit: { type: 'integer', minimum: 1, maximum: 100 },
+      offset: { type: 'integer', minimum: 0 },
+    },
+    additionalProperties: false,
+  },
+};
+
+function stripAnswersForClient(
+  q: TestSnapshot
+): Omit<TestSnapshot, 'correctAnswer' | 'explanation'> {
+  const { correctAnswer: _, explanation: __, ...rest } = q;
+  return rest;
+}
+
+export async function testsRoutes(app: FastifyInstance) {
+  const llmService = new LlmService();
+  const questionService = new QuestionService(app.db, llmService);
+  const testsService = new TestsService(app.db, questionService);
+  const { rateLimitOptions } = app;
+
+  app.get(
+    '/',
+    {
+      schema: historyQuerySchema,
+      config: { rateLimit: rateLimitOptions.apiAuthed },
+      preHandler: [app.authenticate],
+    },
+    async (req, reply) => {
+      const userId = req.user!.id;
+      const { limit, offset } = (req.query as { limit?: number; offset?: number }) ?? {};
+      const { tests: testList, total } = await testsService.getHistory(
+        userId,
+        { limit, offset }
+      );
+      return reply.send({ tests: testList, total });
+    }
+  );
+
+  app.post(
+    '/',
+    {
+      schema: createTestSchema,
+      config: { rateLimit: rateLimitOptions.apiAuthed },
+      preHandler: [app.authenticate, app.withSubscription],
+    },
+    async (req, reply) => {
+      const userId = req.user!.id;
+      const body = req.body as CreateTestInput;
+      const test = await testsService.createTest(userId, body);
+      const hideAnswers = test.status === 'in_progress';
+      const response = {
+        ...test,
+        questions: hideAnswers
+          ? test.questions.map(stripAnswersForClient)
+          : test.questions,
+      };
+      return reply.status(201).send(response);
+    }
+  );
+
+  app.post(
+    '/:testId/answer',
+    {
+      schema: answerSchema,
+      config: { rateLimit: rateLimitOptions.apiAuthed },
+      preHandler: [app.authenticate],
+    },
+    async (req, reply) => {
+      const userId = req.user!.id;
+      const { testId } = req.params as { testId: string };
+      const { questionId, answer } = req.body as { questionId: string; answer: string | string[] };
+      const snapshot = await testsService.answerQuestion(
+        userId,
+        testId,
+        questionId,
+        answer
+      );
+      return reply.send(snapshot);
+    }
+  );
+
+  app.post(
+    '/:testId/finish',
+    {
+      schema: testIdParamsSchema,
+      config: { rateLimit: rateLimitOptions.apiAuthed },
+      preHandler: [app.authenticate],
+    },
+    async (req, reply) => {
+      const userId = req.user!.id;
+      const { testId } = req.params as { testId: string };
+      const test = await testsService.finishTest(userId, testId);
+      return reply.send(test);
+    }
+  );
+
+  app.get(
+    '/:testId',
+    {
+      schema: testIdParamsSchema,
+      config: { rateLimit: rateLimitOptions.apiAuthed },
+      preHandler: [app.authenticate],
+    },
+    async (req, reply) => {
+      const userId = req.user!.id;
+      const { testId } = req.params as { testId: string };
+      const test = await testsService.getById(userId, testId);
+      if (!test) {
+        throw notFound('Test not found');
+      }
+      const hideAnswers = test.status === 'in_progress';
+      const response = {
+        ...test,
+        questions: hideAnswers
+          ? test.questions.map(stripAnswersForClient)
+          : test.questions,
+      };
+      return reply.send(response);
+    }
+  );
+
+}