diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..3f8822d
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,27 @@
+cmake_minimum_required(VERSION 3.21)
+
+project(OrbitHub VERSION 0.1.0 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTOUIC ON)
+set(CMAKE_AUTORCC ON)
+
+find_package(Qt6 6.2 REQUIRED COMPONENTS Widgets)
+
+qt_standard_project_setup()
+
+add_executable(orbithub
+    src/main.cpp
+    src/profiles_window.cpp
+    src/profiles_window.h
+    src/session_window.cpp
+    src/session_window.h
+)
+
+target_link_libraries(orbithub PRIVATE Qt6::Widgets)
+
+install(TARGETS orbithub RUNTIME DESTINATION bin)
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..cf983f5
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,13 @@
+#include "profiles_window.h"
+
+#include <QApplication>
+
+int main(int argc, char* argv[])
+{
+    QApplication app(argc, argv);
+
+    ProfilesWindow window;
+    window.show();
+
+    return app.exec();
+}
diff --git a/src/profiles_window.cpp b/src/profiles_window.cpp
new file mode 100644
index 0000000..bbcea37
--- /dev/null
+++ b/src/profiles_window.cpp
@@ -0,0 +1,135 @@
+#include "profiles_window.h"
+
+#include "session_window.h"
+
+#include <algorithm>
+
+#include <QAbstractItemView>
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QLineEdit>
+#include <QListWidget>
+#include <QListWidgetItem>
+#include <QMessageBox>
+#include <QPushButton>
+#include <QStringList>
+#include <QVBoxLayout>
+#include <QWidget>
+
+ProfilesWindow::ProfilesWindow(QWidget* parent)
+    : QMainWindow(parent),
+      m_searchBox(nullptr),
+      m_profilesList(nullptr),
+      m_newButton(nullptr),
+      m_editButton(nullptr),
+      m_deleteButton(nullptr)
+{
+    setWindowTitle(QStringLiteral("OrbitHub Profiles"));
+    resize(520, 620);
+
+    setupUi();
+    populateSampleProfiles();
+}
+
+void ProfilesWindow::setupUi()
+{
+    auto* central = new QWidget(this);
+    auto* rootLayout = new QVBoxLayout(central);
+
+    auto* searchLabel = new QLabel(QStringLiteral("Search"), central);
+    m_searchBox = new QLineEdit(central);
+    m_searchBox->setPlaceholderText(QStringLiteral("Filter profiles..."));
+
+    m_profilesList = new QListWidget(central);
+    m_profilesList->setSelectionMode(QAbstractItemView::SingleSelection);
+
+    auto* buttonRow = new QHBoxLayout();
+    m_newButton = new QPushButton(QStringLiteral("New"), central);
+    m_editButton = new QPushButton(QStringLiteral("Edit"), central);
+    m_deleteButton = new QPushButton(QStringLiteral("Delete"), central);
+
+    buttonRow->addWidget(m_newButton);
+    buttonRow->addWidget(m_editButton);
+    buttonRow->addWidget(m_deleteButton);
+    buttonRow->addStretch();
+
+    rootLayout->addWidget(searchLabel);
+    rootLayout->addWidget(m_searchBox);
+    rootLayout->addWidget(m_profilesList, 1);
+    rootLayout->addLayout(buttonRow);
+
+    setCentralWidget(central);
+
+    connect(m_searchBox,
+            &QLineEdit::textChanged,
+            this,
+            [this](const QString& text) { filterProfiles(text); });
+
+    connect(m_profilesList,
+            &QListWidget::itemDoubleClicked,
+            this,
+            [this](QListWidgetItem* item) { openSessionForItem(item); });
+
+    // Milestone 0 keeps profile management as placeholders.
+    auto showTodo = [this](const QString& action) {
+        QMessageBox::information(this,
+                                 QStringLiteral("Milestone 0"),
+                                 QStringLiteral("%1 is planned for Milestone 1.").arg(action));
+    };
+
+    connect(m_newButton, &QPushButton::clicked, this, [showTodo]() { showTodo(QStringLiteral("New Profile")); });
+    connect(m_editButton, &QPushButton::clicked, this, [showTodo]() { showTodo(QStringLiteral("Edit Profile")); });
+    connect(m_deleteButton,
+            &QPushButton::clicked,
+            this,
+            [showTodo]() { showTodo(QStringLiteral("Delete Profile")); });
+}
+
+void ProfilesWindow::populateSampleProfiles()
+{
+    const QStringList sampleProfiles = {
+        QStringLiteral("Production Bastion"),
+        QStringLiteral("Staging API Host"),
+        QStringLiteral("Local Lab VM"),
+        QStringLiteral("CI Build Agent")};
+
+    m_profilesList->addItems(sampleProfiles);
+}
+
+void ProfilesWindow::filterProfiles(const QString& query)
+{
+    const QString trimmed = query.trimmed();
+
+    for (int i = 0; i < m_profilesList->count(); ++i) {
+        QListWidgetItem* item = m_profilesList->item(i);
+        const bool matches = trimmed.isEmpty()
+            || item->text().contains(trimmed, Qt::CaseInsensitive);
+        item->setHidden(!matches);
+    }
+}
+
+void ProfilesWindow::openSessionForItem(QListWidgetItem* item)
+{
+    if (item == nullptr) {
+        return;
+    }
+
+    auto* session = new SessionWindow(item->text());
+    session->setAttribute(Qt::WA_DeleteOnClose);
+
+    m_sessionWindows.emplace_back(session);
+    connect(session,
+            &QObject::destroyed,
+            this,
+            [this](QObject* object) {
+                m_sessionWindows.erase(
+                    std::remove_if(m_sessionWindows.begin(),
+                                   m_sessionWindows.end(),
+                                   [object](const QPointer<SessionWindow>& candidate) {
+                                       return candidate.isNull() || candidate.data() == object;
+                                   }),
+                    m_sessionWindows.end());
+            });
+
+    session->show();
+}
diff --git a/src/profiles_window.h b/src/profiles_window.h
new file mode 100644
index 0000000..67965de
--- /dev/null
+++ b/src/profiles_window.h
@@ -0,0 +1,37 @@
+#ifndef ORBITHUB_PROFILES_WINDOW_H
+#define ORBITHUB_PROFILES_WINDOW_H
+
+#include <QMainWindow>
+#include <QString>
+
+#include <QPointer>
+#include <vector>
+
+class QListWidget;
+class QListWidgetItem;
+class QLineEdit;
+class QPushButton;
+class SessionWindow;
+
+class ProfilesWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit ProfilesWindow(QWidget* parent = nullptr);
+
+private:
+    QLineEdit* m_searchBox;
+    QListWidget* m_profilesList;
+    QPushButton* m_newButton;
+    QPushButton* m_editButton;
+    QPushButton* m_deleteButton;
+    std::vector<QPointer<SessionWindow>> m_sessionWindows;
+
+    void setupUi();
+    void populateSampleProfiles();
+    void filterProfiles(const QString& query);
+    void openSessionForItem(QListWidgetItem* item);
+};
+
+#endif
diff --git a/src/session_window.cpp b/src/session_window.cpp
new file mode 100644
index 0000000..c6c6fb7
--- /dev/null
+++ b/src/session_window.cpp
@@ -0,0 +1,45 @@
+#include "session_window.h"
+
+#include <QFont>
+#include <QLabel>
+#include <QTabWidget>
+#include <QVBoxLayout>
+#include <QWidget>
+
+SessionWindow::SessionWindow(const QString& profileName, QWidget* parent)
+    : QMainWindow(parent), m_tabs(new QTabWidget(this))
+{
+    setWindowTitle(QStringLiteral("OrbitHub Session - %1").arg(profileName));
+    resize(900, 600);
+
+    setCentralWidget(m_tabs);
+    addPlaceholderTab(profileName);
+}
+
+void SessionWindow::addPlaceholderTab(const QString& profileName)
+{
+    auto* container = new QWidget(this);
+    auto* layout = new QVBoxLayout(container);
+
+    auto* titleLabel = new QLabel(QStringLiteral("Profile: %1").arg(profileName), container);
+    auto* surfaceLabel = new QLabel(QStringLiteral("OrbitHub Native Surface"), container);
+
+    QFont titleFont = titleLabel->font();
+    titleFont.setBold(true);
+    titleLabel->setFont(titleFont);
+
+    QFont surfaceFont = surfaceLabel->font();
+    surfaceFont.setPointSize(surfaceFont.pointSize() + 6);
+    surfaceFont.setBold(true);
+    surfaceLabel->setFont(surfaceFont);
+
+    surfaceLabel->setAlignment(Qt::AlignCenter);
+    surfaceLabel->setMinimumHeight(200);
+    surfaceLabel->setStyleSheet(
+        QStringLiteral("border: 1px solid #8a8a8a; background-color: #f5f5f5;"));
+
+    layout->addWidget(titleLabel);
+    layout->addWidget(surfaceLabel, 1);
+
+    m_tabs->addTab(container, profileName);
+}
diff --git a/src/session_window.h b/src/session_window.h
new file mode 100644
index 0000000..c2a1330
--- /dev/null
+++ b/src/session_window.h
@@ -0,0 +1,22 @@
+#ifndef ORBITHUB_SESSION_WINDOW_H
+#define ORBITHUB_SESSION_WINDOW_H
+
+#include <QMainWindow>
+#include <QString>
+
+class QTabWidget;
+
+class SessionWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit SessionWindow(const QString& profileName, QWidget* parent = nullptr);
+
+private:
+    QTabWidget* m_tabs;
+
+    void addPlaceholderTab(const QString& profileName);
+};
+
+#endif