diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6b3ebc7..59e96c6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: [ main ]
+    branches: [main]
   pull_request:
-    branches: [ main ]
+    branches: [main]
 
   workflow_dispatch:
 
@@ -21,4 +21,6 @@ jobs:
         run: yarn install
 
       - name: Build
-        run: yarn build
+        run: |
+          yarn build
+          yarn validate
diff --git a/.gitignore b/.gitignore
index 3161163..4b3630b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 node_modules
-index.js
+**.js
 **.d.ts
diff --git a/.travis.yml b/.travis.yml
index 772835c..1b7f3ac 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,3 +9,4 @@ cache:
     - node_modules
 script:
   - yarn build
+  - yarn validate
diff --git a/index.ts b/index.ts
index 6aef7e3..2217f0d 100644
--- a/index.ts
+++ b/index.ts
@@ -21,6 +21,8 @@ export type Company = {
   };
 };
 
-export const data: {
+export type JobsData = {
   [name: string]: Company;
-} = rawData;
+};
+
+export const data: JobsData = rawData;
diff --git a/package.json b/package.json
index 8487bbf..8110b41 100644
--- a/package.json
+++ b/package.json
@@ -1,15 +1,18 @@
 {
   "name": "tech-jobs",
   "version": "1.0.0",
+  "type": "module",
   "main": "index.js",
   "types": "index.d.ts",
   "repository": "git@github.com:techcareerio/tech-jobs.git",
   "author": "Cat Chen <catchen@catchen.me>",
   "license": "MIT",
   "devDependencies": {
+    "ajv": "^7.0.3",
     "typescript": "^4.1.3"
   },
   "scripts": {
-    "build": "npx tsc"
+    "build": "npx tsc",
+    "validate": "node --experimental-json-modules validate.js"
   }
 }
diff --git a/validate.ts b/validate.ts
new file mode 100644
index 0000000..7ffe3ab
--- /dev/null
+++ b/validate.ts
@@ -0,0 +1,60 @@
+import Ajv, { JSONSchemaType, DefinedError } from "ajv";
+import type { Opening, Job, Company, JobsData } from "./index";
+import data from "./data.json";
+
+const openingSchema: JSONSchemaType<Opening> = {
+  type: "object",
+  required: ["available"],
+  properties: {
+    available: { type: "boolean" },
+    url: { type: "string", nullable: true },
+  },
+  additionalProperties: false,
+};
+
+const jobSchema: JSONSchemaType<Job> = {
+  type: "object",
+  required: [],
+  properties: {
+    intern: { ...openingSchema, nullable: true },
+    newGrad: { ...openingSchema, nullable: true },
+    senior: { ...openingSchema, nullable: true },
+    manager: { ...openingSchema, nullable: true },
+  },
+  additionalProperties: false,
+};
+
+const companySchema: JSONSchemaType<Company> = {
+  type: "object",
+  required: ["jobs"],
+  properties: {
+    url: { type: "string", nullable: true },
+    jobs: {
+      type: "object",
+      required: [],
+      properties: {
+        softwareEngineer: { ...jobSchema, nullable: true },
+        dataScientist: { ...jobSchema, nullable: true },
+        productManager: { ...jobSchema, nullable: true },
+      },
+      additionalProperties: false,
+    },
+  },
+  additionalProperties: false,
+};
+
+const schema: JSONSchemaType<JobsData> = {
+  type: "object",
+  required: [],
+  additionalProperties: companySchema,
+};
+
+// @ts-ignore
+const ajv: Ajv = new Ajv.default();
+const validate = ajv.compile(schema);
+if (!validate(data)) {
+  for (const error of validate.errors as DefinedError[]) {
+    console.error(error);
+  }
+  throw new Error("Validation failure");
+}
diff --git a/yarn.lock b/yarn.lock
index 3986214..c581095 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2,7 +2,44 @@
 # yarn lockfile v1
 
 
+ajv@^7.0.3:
+  version "7.0.3"
+  resolved "https://registry.yarnpkg.com/ajv/-/ajv-7.0.3.tgz#13ae747eff125cafb230ac504b2406cf371eece2"
+  integrity sha512-R50QRlXSxqXcQP5SvKUrw8VZeypvo12i2IX0EeR5PiZ7bEKeHWgzgo264LDadUsCU42lTJVhFikTqJwNeH34gQ==
+  dependencies:
+    fast-deep-equal "^3.1.1"
+    json-schema-traverse "^1.0.0"
+    require-from-string "^2.0.2"
+    uri-js "^4.2.2"
+
+fast-deep-equal@^3.1.1:
+  version "3.1.3"
+  resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-3.1.3.tgz#3a7d56b559d6cbc3eb512325244e619a65c6c525"
+  integrity sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==
+
+json-schema-traverse@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/json-schema-traverse/-/json-schema-traverse-1.0.0.tgz#ae7bcb3656ab77a73ba5c49bf654f38e6b6860e2"
+  integrity sha512-NM8/P9n3XjXhIZn1lLhkFaACTOURQXjWhV4BA/RnOv8xvgqtqpAX9IO4mRQxSx1Rlo4tqzeqb0sOlruaOy3dug==
+
+punycode@^2.1.0:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
+  integrity sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==
+
+require-from-string@^2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/require-from-string/-/require-from-string-2.0.2.tgz#89a7fdd938261267318eafe14f9c32e598c36909"
+  integrity sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==
+
 typescript@^4.1.3:
   version "4.1.3"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.3.tgz#519d582bd94cba0cf8934c7d8e8467e473f53bb7"
   integrity sha512-B3ZIOf1IKeH2ixgHhj6la6xdwR9QrLC5d1VKeCSY4tvkqhF2eqd9O7txNlS0PO3GrBAFIdr3L1ndNwteUbZLYg==
+
+uri-js@^4.2.2:
+  version "4.4.1"
+  resolved "https://registry.yarnpkg.com/uri-js/-/uri-js-4.4.1.tgz#9b1a52595225859e55f669d928f88c6c57f2a77e"
+  integrity sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==
+  dependencies:
+    punycode "^2.1.0"