diff --git a/CHANGELOG.md b/CHANGELOG.md
index e24325b..d492a9e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- Enh #12: Implemented `Ely\align_multiline_parameters` fixer.
+- Enabled `Ely\align_multiline_parameters` for Ely.by codestyle in `['types' => false, 'defaults' => false]` mode.
+
 ### Fixed
 - Bug #10: `Ely/blank_line_before_return` don't treat interpolation curly bracket as beginning of the scope.
 - Bug #9: `Ely/line_break_after_statements` add space before next meaningful line of code and skip comments.
diff --git a/README.md b/README.md
index a18de64..a944b34 100644
--- a/README.md
+++ b/README.md
@@ -43,12 +43,14 @@ vendor/bin/php-cs-fixer fix
 ### Configuration
 
 You can pass a custom set of rules to the `\Ely\CS\Config::create()` call. For example, it can be used to validate a
-project with PHP 7.0 compatibility:
+project with PHP 7.4 compatibility:
 
 ```php
 <?php
 return \Ely\CS\Config::create([
-    'visibility_required' => ['property', 'method'],
+    'trailing_comma_in_multiline' => [
+        'elements' => ['arrays', 'arguments'],
+    ],
 ])->setFinder($finder);
 ```
 
@@ -76,12 +78,15 @@ class Foo extends Bar implements FooInterface {
     private const SAMPLE_1 = 123;
     private const SAMPLE_2 = 321;
 
-    public $field1;
+    public Typed $field1;
 
     public $field2;
 
-    public function sampleFunction(int $a, int $b = null): array {
-        if ($a === $b) {
+    public function sampleFunction(
+        int $a,
+        private readonly int $b = null,
+    ): array {
+        if ($a === $this->b) {
             $result = bar();
         } else {
             $result = BazClass::bar($this->field1, $this->field2);
@@ -89,7 +94,7 @@ class Foo extends Bar implements FooInterface {
 
         return $result;
     }
-    
+
     public function setToNull(): self {
         $this->field1 = null;
         return $this;
@@ -154,6 +159,16 @@ class Foo extends Bar implements FooInterface {
   echo 'the next statement is here';
   ```
 
+* There MUST be no alignment around multiline function parameters.
+  
+  ```php
+  <?php
+  function foo(
+      string $input,
+      int $key = 0,
+  ): void {}
+  ```
+
 ## Using our fixers
 
 First of all, you must install Ely.by PHP-CS-Fixer package as described in the [installation chapter](#installation).
@@ -169,6 +184,31 @@ return \PhpCsFixer\Config::create()
 
 And then you'll be able to use our custom rules.
 
+### `Ely/align_multiline_parameters`
+
+Forces aligned or not aligned multiline function parameters:
+
+```diff
+--- Original
++++ New
+@@ @@
+  function foo(
+      string $string,
+-     int $index = 0,
+-     $arg = 'no type',
++     int    $index  = 0,
++            $arg    = 'no type',
+  ): void {}
+```
+
+**Configuration:**
+
+* `variables` - when set to `true`, forces variables alignment. On `false` forces strictly no alignment.
+  You can set it to `null` to disable touching of variables. **Default**: `true`.
+
+* `defaults` - when set to `true`, forces defaults alignment. On `false` forces strictly no alignment.
+  You can set it to `null` to disable touching of defaults. **Default**: `false`.
+
 ### `Ely/blank_line_around_class_body`
 
 Ensure that a class body contains one blank line after its definition and before its end:
diff --git a/src/Fixer/FunctionNotation/AlignMultilineParametersFixer.php b/src/Fixer/FunctionNotation/AlignMultilineParametersFixer.php
new file mode 100644
index 0000000..b357968
--- /dev/null
+++ b/src/Fixer/FunctionNotation/AlignMultilineParametersFixer.php
@@ -0,0 +1,165 @@
+<?php
+declare(strict_types=1);
+
+namespace Ely\CS\Fixer\FunctionNotation;
+
+use Ely\CS\Fixer\AbstractFixer;
+use PhpCsFixer\Fixer\ConfigurableFixerInterface;
+use PhpCsFixer\Fixer\WhitespacesAwareFixerInterface;
+use PhpCsFixer\FixerConfiguration\FixerConfigurationResolver;
+use PhpCsFixer\FixerConfiguration\FixerConfigurationResolverInterface;
+use PhpCsFixer\FixerConfiguration\FixerOptionBuilder;
+use PhpCsFixer\FixerDefinition\CodeSample;
+use PhpCsFixer\FixerDefinition\FixerDefinition;
+use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
+use PhpCsFixer\Tokenizer\Analyzer\FunctionsAnalyzer;
+use PhpCsFixer\Tokenizer\Analyzer\WhitespacesAnalyzer;
+use PhpCsFixer\Tokenizer\Tokens;
+use PhpCsFixer\Tokenizer\TokensAnalyzer;
+use SplFileInfo;
+
+final class AlignMultilineParametersFixer extends AbstractFixer implements ConfigurableFixerInterface, WhitespacesAwareFixerInterface {
+
+    private const C_VARIABLES = 'variables';
+    private const C_DEFAULTS = 'defaults';
+
+    public function getDefinition(): FixerDefinitionInterface {
+        return new FixerDefinition(
+            'Aligns parameters in multiline function declaration.',
+            [
+                new CodeSample(
+                    '<?php
+function test(
+    string $a,
+    int $b = 0
+): void {};
+',
+                ),
+                new CodeSample(
+                    '<?php
+function test(
+    string $string,
+    int    $int    = 0
+): void {};
+',
+                    [self::C_VARIABLES => false, self::C_DEFAULTS => false],
+                ),
+            ],
+        );
+    }
+
+    public function isCandidate(Tokens $tokens): bool {
+        return $tokens->isAnyTokenKindsFound([T_FUNCTION, T_FN]);
+    }
+
+    /**
+     * Must run after StatementIndentationFixer, MethodArgumentSpaceFixer
+     */
+    public function getPriority(): int {
+        return -10;
+    }
+
+    protected function createConfigurationDefinition(): FixerConfigurationResolverInterface {
+        return new FixerConfigurationResolver([
+            (new FixerOptionBuilder(self::C_VARIABLES, 'on null no value alignment, on bool forces alignment'))
+                ->setAllowedTypes(['bool', 'null'])
+                ->setDefault(true)
+                ->getOption(),
+            (new FixerOptionBuilder(self::C_DEFAULTS, 'on null no value alignment, on bool forces alignment'))
+                ->setAllowedTypes(['bool', 'null'])
+                ->setDefault(null)
+                ->getOption(),
+        ]);
+    }
+
+    protected function applyFix(SplFileInfo $file, Tokens $tokens): void {
+        // There is nothing to do
+        if ($this->configuration[self::C_VARIABLES] === null && $this->configuration[self::C_DEFAULTS] === null) {
+            return;
+        }
+
+        $tokensAnalyzer = new TokensAnalyzer($tokens);
+        $functionsAnalyzer = new FunctionsAnalyzer();
+        /** @var \PhpCsFixer\Tokenizer\Token $functionToken */
+        foreach ($tokens as $i => $functionToken) {
+            if (!$functionToken->isGivenKind([T_FUNCTION, T_FN])) {
+                continue;
+            }
+
+            $openBraceIndex = $tokens->getNextTokenOfKind($i, ['(']);
+            $isMultiline = $tokensAnalyzer->isBlockMultiline($tokens, $openBraceIndex);
+            if (!$isMultiline) {
+                continue;
+            }
+
+            /** @var \PhpCsFixer\Tokenizer\Analyzer\Analysis\ArgumentAnalysis[] $arguments */
+            $arguments = $functionsAnalyzer->getFunctionArguments($tokens, $i);
+            if (empty($arguments)) {
+                continue;
+            }
+
+            $longestType = 0;
+            $longestVariableName = 0;
+            $hasAtLeastOneTypedArgument = false;
+            foreach ($arguments as $argument) {
+                $typeAnalysis = $argument->getTypeAnalysis();
+                if ($typeAnalysis) {
+                    $hasAtLeastOneTypedArgument = true;
+                    $typeLength = strlen($typeAnalysis->getName());
+                    if ($typeLength > $longestType) {
+                        $longestType = $typeLength;
+                    }
+                }
+
+                $variableNameLength = strlen($argument->getName());
+                if ($variableNameLength > $longestVariableName) {
+                    $longestVariableName = $variableNameLength;
+                }
+            }
+
+            $argsIndent = WhitespacesAnalyzer::detectIndent($tokens, $i) . $this->whitespacesConfig->getIndent();
+            foreach ($arguments as $argument) {
+                if ($this->configuration[self::C_VARIABLES] !== null) {
+                    $whitespaceIndex = $argument->getNameIndex() - 1;
+                    if ($this->configuration[self::C_VARIABLES] === true) {
+                        $typeLen = 0;
+                        if ($argument->getTypeAnalysis() !== null) {
+                            $typeLen = strlen($argument->getTypeAnalysis()->getName());
+                        }
+
+                        $appendix = str_repeat(' ', $longestType - $typeLen + (int)$hasAtLeastOneTypedArgument);
+                        if ($argument->hasTypeAnalysis()) {
+                            $whitespace = $appendix;
+                        } else {
+                            $whitespace = $this->whitespacesConfig->getLineEnding() . $argsIndent . $appendix;
+                        }
+                    } else {
+                        if ($argument->hasTypeAnalysis()) {
+                            $whitespace = ' ';
+                        } else {
+                            $whitespace = $this->whitespacesConfig->getLineEnding() . $argsIndent;
+                        }
+                    }
+
+                    $tokens->ensureWhitespaceAtIndex($whitespaceIndex, 0, $whitespace);
+                }
+
+                if ($this->configuration[self::C_DEFAULTS] !== null) {
+                    // Can't use $argument->hasDefault() because it's null when it's default for a type (e.g. 0 for int)
+                    /** @var \PhpCsFixer\Tokenizer\Token $equalToken */
+                    $equalToken = $tokens[$tokens->getNextMeaningfulToken($argument->getNameIndex())];
+                    if ($equalToken->getContent() === '=') {
+                        $nameLen = strlen($argument->getName());
+                        $whitespaceIndex = $argument->getNameIndex() + 1;
+                        if ($this->configuration[self::C_DEFAULTS] === true) {
+                            $tokens->ensureWhitespaceAtIndex($whitespaceIndex, 0, str_repeat(' ', $longestVariableName - $nameLen + 1));
+                        } else {
+                            $tokens->ensureWhitespaceAtIndex($whitespaceIndex, 0, ' ');
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+}
diff --git a/src/Rules.php b/src/Rules.php
index 6f66f27..b964a44 100644
--- a/src/Rules.php
+++ b/src/Rules.php
@@ -214,6 +214,10 @@ class Rules {
             ],
 
             // Our custom or extended fixers
+            'Ely/align_multiline_parameters' => [
+                'variables' => false,
+                'defaults' => false,
+            ],
             'Ely/blank_line_around_class_body' => [
                 'apply_to_anonymous_classes' => false,
             ],
diff --git a/tests/Fixer/FunctionNotation/AlignMultilineParametersFixerTest.php b/tests/Fixer/FunctionNotation/AlignMultilineParametersFixerTest.php
new file mode 100644
index 0000000..85a65ba
--- /dev/null
+++ b/tests/Fixer/FunctionNotation/AlignMultilineParametersFixerTest.php
@@ -0,0 +1,219 @@
+<?php
+declare(strict_types=1);
+
+namespace Ely\CS\Test\Fixer\FunctionNotation;
+
+use Ely\CS\Fixer\FunctionNotation\AlignMultilineParametersFixer;
+use PhpCsFixer\AbstractFixer;
+use PhpCsFixer\Tests\Test\AbstractFixerTestCase;
+
+/**
+ * @covers \Ely\CS\Fixer\FunctionNotation\AlignMultilineParametersFixer
+ */
+final class AlignMultilineParametersFixerTest extends AbstractFixerTestCase {
+
+    /**
+     * @dataProvider provideTrueCases
+     */
+    public function testBothTrue(string $expected, ?string $input = null): void {
+        $this->fixer->configure([
+            'variables' => true,
+            'defaults' => true,
+        ]);
+        $this->doTest($expected, $input);
+    }
+
+    public function provideTrueCases(): iterable {
+        yield 'empty function' => [
+            '<?php
+            function test(): void {}
+            ',
+        ];
+
+        yield 'empty multiline function' => [
+            '<?php
+            function test(
+            ): void {}
+            ',
+        ];
+
+        yield 'single line function' => [
+            '<?php
+            function test(string $a, int $b): void {}
+            ',
+        ];
+
+        yield 'single line fn' => [
+            '<?php
+            fn(string $a, int $b) => $b;
+            ',
+        ];
+
+        yield 'function, no defaults' => [
+            '<?php
+            function test(
+                string $a,
+                int    $b
+            ): void {}
+            ',
+            '<?php
+            function test(
+                string $a,
+                int $b
+            ): void {}
+            ',
+        ];
+
+        yield 'function, one has default' => [
+            '<?php
+            function test(
+                string $a,
+                int    $b = 0
+            ): void {}
+            ',
+            '<?php
+            function test(
+                string $a,
+                int $b = 0
+            ): void {}
+            ',
+        ];
+
+        yield 'function, one has no type' => [
+            '<?php
+            function test(
+                string $a,
+                       $b
+            ): void {}
+            ',
+            '<?php
+            function test(
+                string $a,
+                $b
+            ): void {}
+            ',
+        ];
+
+        yield 'function, one has no type, but has default' => [
+            '<?php
+            function test(
+                string $a,
+                       $b = 0
+            ): void {}
+            ',
+            '<?php
+            function test(
+                string $a,
+                $b = 0
+            ): void {}
+            ',
+        ];
+
+        yield 'function, no types at all' => [
+            '<?php
+            function test(
+                $string = "string",
+                $int    = 0
+            ): void {}
+            ',
+            '<?php
+            function test(
+                $string = "string",
+                $int = 0
+            ): void {}
+            ',
+        ];
+
+        yield 'function, defaults' => [
+            '<?php
+            function test(
+                string $string = "string",
+                int    $int    = 0
+            ): void {}
+            ',
+            '<?php
+            function test(
+                string $string = "string",
+                int $int = 0
+            ): void {}
+            ',
+        ];
+
+        yield 'class method, defaults' => [
+            '<?php
+            class Test {
+                public function foo(
+                    string $string = "string",
+                    int    $int    = 0
+                ): void {}
+            }
+            ',
+            '<?php
+            class Test {
+                public function foo(
+                    string $string = "string",
+                    int $int = 0
+                ): void {}
+            }
+            ',
+        ];
+
+        yield 'fn, defaults' => [
+            '<?php
+            fn(
+                string $string = "string",
+                int    $int    = 0
+            ) => $int;
+            ',
+            '<?php
+            fn(
+                string $string = "string",
+                int $int = 0
+            ) => $int;
+            ',
+        ];
+    }
+
+    /**
+     * @dataProvider provideFalseCases
+     */
+    public function testBothFalse(string $expected, ?string $input = null): void {
+        $this->fixer->configure([
+            'variables' => false,
+            'defaults' => false,
+        ]);
+        $this->doTest($expected, $input);
+    }
+
+    public function provideFalseCases(): iterable {
+        foreach ($this->provideTrueCases() as $key => $case) {
+            if (isset($case[1])) {
+                yield $key => [$case[1], $case[0]];
+            } else {
+                yield $key => $case;
+            }
+        }
+    }
+
+    /**
+     * @dataProvider provideNullCases
+     */
+    public function testBothNull(string $expected, ?string $input = null): void {
+        $this->fixer->configure([
+            'variables' => null,
+            'defaults' => null,
+        ]);
+        $this->doTest($expected, $input);
+    }
+
+    public function provideNullCases(): iterable {
+        foreach ($this->provideFalseCases() as $key => $case) {
+            yield $key => [$case[0]];
+        }
+    }
+
+    protected function createFixer(): AbstractFixer {
+        return new AlignMultilineParametersFixer();
+    }
+
+}