diff --git a/.eslintrc.json b/.eslintrc.json
index 3b9586024..907b53742 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -16,6 +16,9 @@
     "es6": true,
     "jest/globals": true
   },
+  "globals": {
+    "Deno": true
+  },
   "rules": {
     // Error out for code formatting errors
     "prettier/prettier": "error",
@@ -55,6 +58,8 @@
     // For this project only use kebab-case
     "unicorn/filename-case": ["error", { "cases": { "kebabCase": true } }],
     // Allow Array.from(set) mitigate TS2569 which would require '--downlevelIteration'
-    "unicorn/prefer-spread": "off"
+    "unicorn/prefer-spread": "off",
+    // Temporarily allow disabling for whole file
+    "eslint-comments/no-use": "off"
   }
 }
diff --git a/action.yml b/action.yml
index 1e0e6a95e..20429d76a 100644
--- a/action.yml
+++ b/action.yml
@@ -1,6 +1,58 @@
 name: 'Unity - Builder'
 author: Webber Takken <webber@takken.io>
 description: 'Build Unity projects for different platforms.'
+runs:
+  using: 'composite'
+  steps:
+    - run: echo "Using GameCI CLI to build project"
+      shell: bash
+    - uses: denoland/setup-deno@v1
+      with:
+        deno-version: v1.x
+    - run: |
+        deno run --allow-run ./cli/index.ts build \
+        --targetPlatform="${{ inputs.targetPlatform }}" \
+        --unityVersion="${{ inputs.unityVersion }}" \
+        --customImage="${{ inputs.customImage }}" \
+        --projectPath="${{ inputs.projectPath }}" \
+        --buildName="${{ inputs.buildName }}" \
+        --buildsPath="${{ inputs.buildsPath }}" \
+        --buildMethod="${{ inputs.buildMethod }}" \
+        --customParameters="${{ inputs.customParameters }}" \
+        --versioning="${{ inputs.versioning }}" \
+        --version="${{ inputs.version }}" \
+        --androidVersionCode="${{ inputs.androidVersionCode }}" \
+        --androidAppBundle="${{ inputs.androidAppBundle }}" \
+        --androidKeystoreName="${{ inputs.androidKeystoreName }}" \
+        --androidKeystoreBase64="${{ inputs.androidKeystoreBase64 }}" \
+        --androidKeystorePass="${{ inputs.androidKeystorePass }}" \
+        --androidKeyaliasName="${{ inputs.androidKeyaliasName }}" \
+        --androidKeyaliasPass="${{ inputs.androidKeyaliasPass }}" \
+        --androidTargetSdkVersion="${{ inputs.androidTargetSdkVersion }}" \
+        --sshAgent="${{ inputs.sshAgent }}" \
+        --gitPrivateToken="${{ inputs.gitPrivateToken }}" \
+        --chownFilesTo="${{ inputs.chownFilesTo }}" \
+        --allowDirtyBuild="${{ inputs.allowDirtyBuild }}" \
+        --postBuildSteps="${{ inputs.postBuildSteps }}" \
+        --preBuildSteps="${{ inputs.preBuildSteps }}" \
+        --customJobHooks="${{ inputs.customJobHooks }}" \
+        --customJob="${{ inputs.customJob }}" \
+        --awsBaseStackName="${{ inputs.awsBaseStackName }}" \
+        --cloudRunnerCluster="${{ inputs.cloudRunnerCluster }}" \
+        --cloudRunnerCpu="${{ inputs.cloudRunnerCpu }}" \
+        --cloudRunnerMemory="${{ inputs.cloudRunnerMemory }}" \
+        --cachePushOverrideCommand="${{ inputs.cachePushOverrideCommand }}" \
+        --cachePullOverrideCommand="${{ inputs.cachePullOverrideCommand }}" \
+        --readInputFromOverrideList="${{ inputs.readInputFromOverrideList }}" \
+        --readInputOverrideCommand="${{ inputs.readInputOverrideCommand }}" \
+        --kubeConfig="${{ inputs.kubeConfig }}" \
+        --kubeVolume="${{ inputs.kubeVolume }}" \
+        --kubeStorageClass="${{ inputs.kubeStorageClass }}" \
+        --kubeVolumeSize="${{ inputs.kubeVolumeSize }}" \
+        --cacheKey="${{ inputs.cacheKey }}" \
+        --checkDependencyHealthOverride="${{ inputs.checkDependencyHealthOverride }}" \
+        --startDependenciesOverride="${{ inputs.startDependenciesOverride }}"
+      shell: bash
 inputs:
   targetPlatform:
     required: true
@@ -174,6 +226,3 @@ outputs:
 branding:
   icon: 'box'
   color: 'gray-dark'
-runs:
-  using: 'node12'
-  main: 'dist/index.js'
diff --git a/cli/arguments-parser/arguments-parser.ts b/cli/arguments-parser/arguments-parser.ts
new file mode 100644
index 000000000..20c93e2b7
--- /dev/null
+++ b/cli/arguments-parser/arguments-parser.ts
@@ -0,0 +1,12 @@
+import { parseArgv } from '../core/parse-argv.ts';
+
+export class ArgumentsParser {
+  static parse(cliArguments: string[]) {
+    const [commandName, ...arguments] = cliArguments;
+
+    return {
+      commandName,
+      options: parseArgv(arguments),
+    };
+  }
+}
diff --git a/cli/bootstrapper.ts b/cli/bootstrapper.ts
new file mode 100644
index 000000000..a617c9438
--- /dev/null
+++ b/cli/bootstrapper.ts
@@ -0,0 +1,28 @@
+import { CommandFactory } from './commands/command-factory.ts';
+import { ArgumentsParser } from './arguments-parser/arguments-parser.ts';
+import { Options } from './config/options.ts';
+import { CommandInterface } from './commands/command/CommandInterface.ts';
+
+export class Bootstrapper {
+  private readonly commandFactory: CommandFactory;
+  private readonly argumentsParser: ArgumentsParser;
+
+  private options?: Options;
+  private command?: CommandInterface;
+
+  constructor() {
+    this.commandFactory = new CommandFactory();
+    this.argumentsParser = ArgumentsParser;
+  }
+
+  public async run(cliArguments: string[]) {
+    const { commandName, options } = this.argumentsParser.parse(cliArguments);
+
+    this.options = new Options(options);
+    this.command = this.commandFactory.createCommand(commandName);
+
+    // Command agnostic stuff here
+
+    await this.command.execute(this.options);
+  }
+}
diff --git a/cli/commands/command-factory.ts b/cli/commands/command-factory.ts
new file mode 100644
index 000000000..65ab38e8b
--- /dev/null
+++ b/cli/commands/command-factory.ts
@@ -0,0 +1,15 @@
+import { NonExistentCommand } from './command/non-existent-command.ts';
+import { BuildCommand } from './command/build-command.ts';
+
+export class CommandFactory {
+  constructor() {}
+
+  public createCommand(commandName) {
+    switch (commandName) {
+      case 'build':
+        return new BuildCommand();
+      default:
+        return new NonExistentCommand(commandName);
+    }
+  }
+}
diff --git a/cli/commands/command/CommandInterface.ts b/cli/commands/command/CommandInterface.ts
new file mode 100644
index 000000000..74689cc24
--- /dev/null
+++ b/cli/commands/command/CommandInterface.ts
@@ -0,0 +1,6 @@
+import { Options } from '../../config/options.ts';
+
+export interface CommandInterface {
+  name: string;
+  execute: (options: Options) => Promise<void>;
+}
diff --git a/cli/commands/command/build-command.ts b/cli/commands/command/build-command.ts
new file mode 100644
index 000000000..2f8ab2cf5
--- /dev/null
+++ b/cli/commands/command/build-command.ts
@@ -0,0 +1,23 @@
+import { CommandInterface } from './CommandInterface.ts';
+import { exec, OutputMode } from 'https://deno.land/x/exec@0.0.5/mod.ts';
+import { Options } from '../../config/options.ts';
+
+export class BuildCommand implements CommandInterface {
+  public readonly name: string;
+
+  constructor(name: string) {
+    this.name = name;
+  }
+
+  public async execute(options: Options) {
+    const result = await exec('docker run -it unityci/editor:2020.3.15f2-base-1 /bin/bash -c "echo test"', {
+      output: OutputMode.Capture,
+      continueOnError: true,
+
+      // verbose: true,
+    });
+
+    console.log(options);
+    console.log(result.output);
+  }
+}
diff --git a/cli/commands/command/non-existent-command.ts b/cli/commands/command/non-existent-command.ts
new file mode 100644
index 000000000..67ac00d7c
--- /dev/null
+++ b/cli/commands/command/non-existent-command.ts
@@ -0,0 +1,14 @@
+import { CommandInterface } from './CommandInterface.ts';
+import { Options } from '../../config/options.ts';
+
+export class NonExistentCommand implements CommandInterface {
+  public name: string;
+
+  constructor(name: string) {
+    this.name = name;
+  }
+
+  public async execute(options: Options) {
+    throw new Error(`Command ${this.name} does not exist`);
+  }
+}
diff --git a/cli/config/options.ts b/cli/config/options.ts
new file mode 100644
index 000000000..d646edc5f
--- /dev/null
+++ b/cli/config/options.ts
@@ -0,0 +1,9 @@
+import { CliOptions } from '../core/cli-options.ts';
+
+export class Options {
+  public options: CliOptions;
+
+  constructor(optionsFromCli) {
+    this.options = optionsFromCli;
+  }
+}
diff --git a/cli/core/cli-options.ts b/cli/core/cli-options.ts
new file mode 100644
index 000000000..b099a31b7
--- /dev/null
+++ b/cli/core/cli-options.ts
@@ -0,0 +1 @@
+export type CliOptions = Map<string, string | number | boolean>;
diff --git a/cli/core/parse-argv.ts b/cli/core/parse-argv.ts
new file mode 100644
index 000000000..4c0bfc698
--- /dev/null
+++ b/cli/core/parse-argv.ts
@@ -0,0 +1,51 @@
+import { CliOptions } from './cli-options.ts';
+
+/**
+ * Parse command line arguments
+ *
+ * Usage:
+ *   console.dir(parseArgv(Deno.args)); // Deno
+ *   console.log(parseArgv(process.argv)); // Node
+ *
+ * Example:
+ *   deno run my-script -test1=1 -test2 "2" -test3 -test4 false -test5 "one" -test6= -test7=9BX9
+ *
+ * Output:
+ *   Map {
+ *     "test1" => 1,
+ *     "test2" => 2,
+ *     "test3" => true,
+ *     "test4" => false,
+ *     "test5" => "one",
+ *     "test6" => "",
+ *     "test7" => "9BX9"
+ *   }
+ */
+export const parseArgv = (argv: string[] = [], { verbose = false } = {}): CliOptions => {
+  const providedArguments = new Map<string, string | number | boolean>();
+
+  for (let current = 0, next = 1; current < argv.length; current += 1, next += 1) {
+    // Detect flag
+    if (!argv[current].startsWith('-')) continue;
+    let flag = argv[current].replace(/^-+/, '');
+
+    // Detect value
+    const hasNextArgument = next < argv.length && !argv[next].startsWith('-');
+    let value: string | number | boolean = hasNextArgument ? argv[next] : 'true';
+
+    // Split combinations
+    const isCombination = flag.includes('=');
+    if (isCombination) [flag, value] = flag.split('=');
+
+    // Parse types
+    if (['true', 'false'].includes(value)) value = value === 'true';
+    else if (!Number.isNaN(Number(value)) && !Number.isNaN(Number.parseInt(value))) value = Number.parseInt(value);
+
+    // Assign
+    // eslint-disable-next-line no-console
+    if (verbose) console.log(`Found flag "${flag}" with value "${value}" (${typeof value}).`);
+    providedArguments.set(flag, value);
+  }
+
+  return providedArguments;
+};
diff --git a/cli/index.ts b/cli/index.ts
new file mode 100644
index 000000000..7a2b224b1
--- /dev/null
+++ b/cli/index.ts
@@ -0,0 +1,11 @@
+/* eslint-disable no-console */
+import { Bootstrapper } from './bootstrapper.ts';
+
+(async () => {
+  try {
+    await new Bootstrapper().run(Deno.args);
+  } catch (error) {
+    console.error(error);
+    Deno.exit(1);
+  }
+})();
diff --git a/deno.json b/deno.json
new file mode 100644
index 000000000..fb4c2294b
--- /dev/null
+++ b/deno.json
@@ -0,0 +1,31 @@
+{
+  "compilerOptions": {
+    "allowJs": true,
+    "lib": ["deno.window"],
+    "strict": true
+  },
+  "lint": {
+    "files": {
+      "include": ["cli/"],
+      "exclude": []
+    },
+    "rules": {
+      "tags": ["recommended"],
+      "include": ["ban-untagged-todo"],
+      "exclude": ["no-unused-vars"]
+    }
+  },
+  "fmt": {
+    "files": {
+      "include": ["cli/"],
+      "exclude": []
+    },
+    "options": {
+      "useTabs": false,
+      "lineWidth": 120,
+      "indentWidth": 2,
+      "singleQuote": true,
+      "proseWrap": "preserve"
+    }
+  }
+}
diff --git a/tsconfig.json b/tsconfig.json
index e8c9118c8..474bccee3 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,7 +4,7 @@
     "target": "es6" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */,
     "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
     "outDir": "./lib" /* Redirect output structure to the directory. */,
-    "rootDir": "./src" /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */,
+    "rootDir": "./cli" /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */,
     "strict": true /* Enable all strict type-checking options. */,
     "noImplicitAny": false /* Re-enable after fixing compatibility */ /* Raise error on expressions and declarations with an implied 'any' type. */,
     "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */