diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..fe699e0
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,10 @@
+BasedOnStyle: Google
+IndentWidth: 4
+AccessModifierOffset: -4
+ColumnLimit: 100
+AllowShortFunctionsOnASingleLine: None
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+DerivePointerAlignment: true
+KeepEmptyLinesAtTheStartOfBlocks: true
+SortIncludes: false
diff --git a/.clang-tidy b/.clang-tidy
new file mode 100644
index 0000000..1f59684
--- /dev/null
+++ b/.clang-tidy
@@ -0,0 +1,41 @@
+---
+Checks:          '-*,cppcoreguidelines-avoid-goto,cppcoreguidelines-pro-type-const-cast, google-readability-casting, modernize-replace-random-shuffle, readability-braces-around-statements, readability-container-size-empty, readability-redundant-control-flow, readability-redundant-string-init, modernize-use-nullptr, readability-identifier-naming, google-build-using-namespace'
+HeaderFilterRegex: '\.h$'
+WarningsAsErrors: '*'
+CheckOptions:
+  - key: readability-identifier-naming.NamespaceCase
+    value: lower_case
+  - key: readability-identifier-naming.ClassCase
+    value: CamelCase
+  - key: readability-identifier-naming.TypedefCase
+    value: CamelCase
+  - key: readability-identifier-naming.TypedefIgnoredRegexp
+    value: (allocator_type|size_type|key_type|value_type|mapped_type|difference_type|pointer|const_pointer|reference|const_reference|iterator_category|const_iterator|iterator|reverse_iterator|const_reverse_iterator|key_compare)
+  - key: readability-identifier-naming.TypeAliasCase
+    value: CamelCase
+  - key: readability-identifier-naming.PrivateMemberSuffix
+    value: '_'
+  - key: readability-identifier-naming.StructCase
+    value: CamelCase
+  - key: readability-identifier-naming.FunctionCase
+    value: CamelCase
+  - key: readability-identifier-naming.VariableCase
+    value: lower_case
+  - key: readability-identifier-naming.PrivateMemberCase
+    value: lower_case
+  - key: readability-identifier-naming.ParameterCase
+    value: lower_case
+  - key: readability-identifier-naming.GlobalConstantPrefix
+    value: k
+  - key: readability-identifier-naming.GlobalConstantCase
+    value: CamelCase
+  - key: readability-identifier-naming.StaticConstantPrefix
+    value: k
+  - key: readability-identifier-naming.StaticConstantCase
+    value: CamelCase
+  - key: readability-identifier-naming.ConstexprVariableCase
+    value: CamelCase
+  - key: readability-identifier-naming.ConstexprVariablePrefix
+    value: k
+  - key: google-runtime-int.TypeSuffix
+    value: _t
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..25cb436
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,104 @@
+name: CI
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  asan:
+    name: Tests (ASAN+UBSAN)
+    runs-on: ubuntu-24.04
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install tools
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y ninja-build cmake clang
+
+      - name: Configure (Debug, ASAN+UBSAN)
+        run: |
+          cmake -S . -B build-asan -G Ninja \
+            -DCMAKE_BUILD_TYPE=Debug \
+            -DCMAKE_C_COMPILER=clang \
+            -DCMAKE_CXX_COMPILER=clang++ \
+            -DCOLUMNAR_BUILD_TESTS=ON \
+            -DCOLUMNAR_BUILD_BENCHMARKS=OFF \
+            -DCMAKE_C_FLAGS="-fsanitize=address,undefined -fno-omit-frame-pointer" \
+            -DCMAKE_CXX_FLAGS="-fsanitize=address,undefined -fno-omit-frame-pointer"
+
+      - name: Build
+        run: cmake --build build-asan
+
+      - name: Run tests
+        run: ctest --test-dir build-asan --output-on-failure
+
+
+  tsan:
+    name: Tests (TSAN)
+    runs-on: ubuntu-24.04
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install tools
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y ninja-build cmake clang
+
+      - name: Configure (Debug, TSAN)
+        run: |
+          cmake -S . -B build-tsan -G Ninja \
+            -DCMAKE_BUILD_TYPE=Debug \
+            -DCMAKE_C_COMPILER=clang \
+            -DCMAKE_CXX_COMPILER=clang++ \
+            -DCOLUMNAR_BUILD_TESTS=ON \
+            -DCOLUMNAR_BUILD_BENCHMARKS=OFF \
+            -DCMAKE_C_FLAGS="-fsanitize=thread -fno-omit-frame-pointer" \
+            -DCMAKE_CXX_FLAGS="-fsanitize=thread -fno-omit-frame-pointer"
+
+      - name: Build
+        run: cmake --build build-tsan
+
+      - name: Run tests
+        env:
+          TSAN_OPTIONS: "halt_on_error=1"
+        run: ctest --test-dir build-tsan --output-on-failure
+
+
+  release-bench:
+    name: Benchmark (Release)
+    runs-on: ubuntu-24.04
+    needs: [asan, tsan]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install tools
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y ninja-build cmake g++
+
+      - name: Configure (Release)
+        run: |
+          cmake -S . -B build-release -G Ninja \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DCOLUMNAR_BUILD_TESTS=OFF \
+            -DCOLUMNAR_BUILD_BENCHMARKS=ON
+
+      - name: Build
+        run: cmake --build build-release
+
+      - name: Run all benchmarks
+        run: |
+          chmod +x tools/run_benchmarks.sh
+          tools/run_benchmarks.sh build-release
diff --git a/.gitignore b/.gitignore
index d4fb281..8e20cef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -39,3 +39,7 @@
 
 # debug information files
 *.dwo
+
+build/
+.vscode/
+.cache/
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..978defb
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,31 @@
+cmake_minimum_required(VERSION 3.20)
+project(columnar_engine LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+option(COLUMNAR_BUILD_TESTS "Build tests" ON)
+option(COLUMNAR_BUILD_BENCHMARKS "Build benchmarks" ON)
+
+include(cmake/deps.cmake)
+
+add_library(columnar_lib
+  src/add.cpp
+)
+
+target_include_directories(columnar_lib PUBLIC include)
+
+target_compile_options(columnar_lib PRIVATE -Wall -Wextra -Wpedantic)
+
+add_subdirectory(apps/converter)
+
+if(COLUMNAR_BUILD_TESTS)
+  enable_testing()
+  add_subdirectory(tests)
+endif()
+
+if(COLUMNAR_BUILD_BENCHMARKS)
+  add_subdirectory(benchmarks)
+endif()
diff --git a/apps/converter/CMakeLists.txt b/apps/converter/CMakeLists.txt
new file mode 100644
index 0000000..ad9781a
--- /dev/null
+++ b/apps/converter/CMakeLists.txt
@@ -0,0 +1,10 @@
+add_executable(converter
+  main.cpp
+)
+
+target_link_libraries(converter
+  PRIVATE
+    columnar_lib
+    absl::flags
+    absl::flags_parse
+)
diff --git a/apps/converter/main.cpp b/apps/converter/main.cpp
new file mode 100644
index 0000000..09b7f9f
--- /dev/null
+++ b/apps/converter/main.cpp
@@ -0,0 +1,17 @@
+#include <absl/flags/flag.h>
+#include <absl/flags/parse.h>
+
+#include <iostream>
+
+#include "columnar/add.h"
+
+ABSL_FLAG(int, x, 1, "x");
+ABSL_FLAG(int, y, 2, "y");
+
+int main(int argc, char** argv) {
+    absl::ParseCommandLine(argc, argv);
+    int x = absl::GetFlag(FLAGS_x);
+    int y = absl::GetFlag(FLAGS_y);
+    std::cout << "Add(" << x << ", " << y << ") = " << columnar::Add(x, y) << "\n";
+    return 0;
+}
diff --git a/benchmarks/CMakeLists.txt b/benchmarks/CMakeLists.txt
new file mode 100644
index 0000000..e0c05a3
--- /dev/null
+++ b/benchmarks/CMakeLists.txt
@@ -0,0 +1,9 @@
+add_executable(columnar_bench
+  bench_bruh.cpp
+)
+
+target_link_libraries(columnar_bench
+  PRIVATE
+    columnar_lib
+    benchmark::benchmark_main
+)
diff --git a/benchmarks/bench_bruh.cpp b/benchmarks/bench_bruh.cpp
new file mode 100644
index 0000000..a6440b7
--- /dev/null
+++ b/benchmarks/bench_bruh.cpp
@@ -0,0 +1,12 @@
+#include <benchmark/benchmark.h>
+#include "columnar/add.h"
+
+static void BenchmarkAdd(benchmark::State& state) {
+    int x = 1;
+    int y = 2;
+    for (auto _ : state) {
+        benchmark::DoNotOptimize(columnar::Add(x, y));
+    }
+}
+
+BENCHMARK(BenchmarkAdd);
diff --git a/cmake/deps.cmake b/cmake/deps.cmake
new file mode 100644
index 0000000..853e617
--- /dev/null
+++ b/cmake/deps.cmake
@@ -0,0 +1,22 @@
+include(FetchContent)
+
+FetchContent_Declare(
+  googletest
+  URL https://github.com/google/googletest/archive/refs/tags/v1.15.2.zip
+)
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
+FetchContent_Declare(
+  benchmark
+  URL https://github.com/google/benchmark/archive/refs/tags/v1.9.1.zip
+)
+set(BENCHMARK_ENABLE_TESTING OFF CACHE BOOL "" FORCE)
+set(BENCHMARK_ENABLE_GTEST_TESTS OFF CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(benchmark)
+
+FetchContent_Declare(
+  absl
+  URL https://github.com/abseil/abseil-cpp/archive/refs/tags/20240116.2.zip
+)
+FetchContent_MakeAvailable(absl)
\ No newline at end of file
diff --git a/include/columnar/add.h b/include/columnar/add.h
new file mode 100644
index 0000000..411598f
--- /dev/null
+++ b/include/columnar/add.h
@@ -0,0 +1,5 @@
+#pragma once
+
+namespace columnar {
+int Add(int a, int b);
+}  // namespace columnar
diff --git a/src/add.cpp b/src/add.cpp
new file mode 100644
index 0000000..8540034
--- /dev/null
+++ b/src/add.cpp
@@ -0,0 +1,7 @@
+#include "columnar/add.h"
+
+namespace columnar {
+int Add(int a, int b) {
+    return a + b;
+}
+}  // namespace columnar
\ No newline at end of file
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
new file mode 100644
index 0000000..fd7d94d
--- /dev/null
+++ b/tests/CMakeLists.txt
@@ -0,0 +1,12 @@
+add_executable(columnar_tests
+  test_bruh.cpp
+)
+
+target_link_libraries(columnar_tests
+  PRIVATE
+    columnar_lib
+    GTest::gtest_main
+)
+
+include(GoogleTest)
+gtest_discover_tests(columnar_tests)
diff --git a/tests/test_bruh.cpp b/tests/test_bruh.cpp
new file mode 100644
index 0000000..a18cad5
--- /dev/null
+++ b/tests/test_bruh.cpp
@@ -0,0 +1,6 @@
+#include <gtest/gtest.h>
+#include "columnar/add.h"
+
+TEST(Bruh, AddWorks) {
+    EXPECT_EQ(columnar::Add(1, 2), 3);
+}
\ No newline at end of file
diff --git a/tools/run_benchmarks.sh b/tools/run_benchmarks.sh
new file mode 100755
index 0000000..3a8d1f9
--- /dev/null
+++ b/tools/run_benchmarks.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+BUILD_DIR="${1:-build-release}"
+BENCH_DIR="${BUILD_DIR}/benchmarks"
+
+MIN_TIME="${BENCH_MIN_TIME:-0.1}"
+REPS="${BENCH_REPS:-1}"
+
+if [[ ! -d "$BENCH_DIR" ]]; then
+  echo "[bench] No benchmarks dir: $BENCH_DIR"
+  echo "[bench] Nothing to run."
+  exit 0
+fi
+
+echo "[bench] Looking for benchmark executables in: $BENCH_DIR"
+
+mapfile -d '' BENCHES < <(find "$BENCH_DIR" -maxdepth 1 -type f -executable -print0)
+
+if [[ "${#BENCHES[@]}" -eq 0 ]]; then
+  echo "[bench] No benchmark executables found."
+  exit 0
+fi
+
+for b in "${BENCHES[@]}"; do
+  echo "=================================================="
+  echo "[bench] Running: $b"
+  "$b" --benchmark_min_time="$MIN_TIME" --benchmark_repetitions="$REPS"
+done
+
+echo "=================================================="
+echo "[bench] Done."