diff --git a/backend/src/main/java/com/gaiotti/zenith/config/DemoDataSeeder.java b/backend/src/main/java/com/gaiotti/zenith/config/DemoDataSeeder.java
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+++ b/backend/src/main/java/com/gaiotti/zenith/config/DemoDataSeeder.java
@@ -0,0 +1,128 @@
+package com.gaiotti.zenith.config;
+
+import com.gaiotti.zenith.model.Category;
+import com.gaiotti.zenith.model.Ledger;
+import com.gaiotti.zenith.model.LedgerMember;
+import com.gaiotti.zenith.model.Transaction;
+import com.gaiotti.zenith.model.User;
+import com.gaiotti.zenith.repository.CategoryRepository;
+import com.gaiotti.zenith.repository.LedgerMemberRepository;
+import com.gaiotti.zenith.repository.LedgerRepository;
+import com.gaiotti.zenith.repository.TransactionRepository;
+import com.gaiotti.zenith.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.context.annotation.Profile;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.math.BigDecimal;
+import java.time.LocalDate;
+import java.time.YearMonth;
+import java.util.ArrayList;
+import java.util.List;
+
+@Slf4j
+@Component
+@Profile("prod")
+@RequiredArgsConstructor
+public class DemoDataSeeder implements CommandLineRunner {
+
+    private static final String ANA_EMAIL = "ana.demo@zenith.app";
+    private static final String BRUNO_EMAIL = "bruno.demo@zenith.app";
+    private static final String DEMO_PASSWORD = "Zenith#Demo2026";
+    private static final String LEDGER_NAME = "Casa Ana & Bruno";
+
+    private final UserRepository userRepository;
+    private final LedgerRepository ledgerRepository;
+    private final LedgerMemberRepository ledgerMemberRepository;
+    private final CategoryRepository categoryRepository;
+    private final TransactionRepository transactionRepository;
+    private final PasswordEncoder passwordEncoder;
+
+    @Override
+    @Transactional
+    public void run(String... args) {
+        if (userRepository.existsByEmail(ANA_EMAIL)) {
+            return;
+        }
+
+        User ana = userRepository.save(User.builder()
+                .email(ANA_EMAIL)
+                .passwordHash(passwordEncoder.encode(DEMO_PASSWORD))
+                .displayName("Ana")
+                .aiEnabled(true)
+                .build());
+
+        User bruno = userRepository.save(User.builder()
+                .email(BRUNO_EMAIL)
+                .passwordHash(passwordEncoder.encode(DEMO_PASSWORD))
+                .displayName("Bruno")
+                .aiEnabled(true)
+                .build());
+
+        Ledger ledger = ledgerRepository.save(Ledger.builder().name(LEDGER_NAME).build());
+        ledgerMemberRepository.save(LedgerMember.builder().ledger(ledger).user(ana).build());
+        ledgerMemberRepository.save(LedgerMember.builder().ledger(ledger).user(bruno).build());
+
+        Category salario = category(ledger, ana, "Salário", "#22C55E");
+        Category moradia = category(ledger, ana, "Moradia", "#6366F1");
+        Category mercado = category(ledger, ana, "Mercado", "#F59E0B");
+        Category transporte = category(ledger, bruno, "Transporte", "#3B82F6");
+        Category lazer = category(ledger, bruno, "Lazer", "#EC4899");
+        Category saude = category(ledger, bruno, "Saúde", "#14B8A6");
+        categoryRepository.saveAll(List.of(salario, moradia, mercado, transporte, lazer, saude));
+
+        List<Transaction> transactions = new ArrayList<>();
+        for (int monthsAgo = 2; monthsAgo >= 0; monthsAgo--) {
+            YearMonth month = YearMonth.now().minusMonths(monthsAgo);
+            transactions.add(income(ledger, ana, salario, "5200.00", month.atDay(5), "Salário Ana"));
+            transactions.add(income(ledger, bruno, salario, "4300.00", month.atDay(5), "Salário Bruno"));
+            transactions.add(expense(ledger, ana, moradia, "1800.00", month.atDay(10), "Aluguel"));
+            transactions.add(expense(ledger, ana, moradia, "320.00", month.atDay(12), "Luz e água"));
+            transactions.add(expense(ledger, ana, mercado, "640.50", month.atDay(8), "Compras do mês"));
+            transactions.add(expense(ledger, bruno, mercado, "215.90", month.atDay(21), "Feira e padaria"));
+            transactions.add(expense(ledger, bruno, transporte, "280.00", month.atDay(6), "Combustível"));
+            transactions.add(expense(ledger, ana, transporte, "96.00", month.atDay(16), "Transporte por app"));
+            transactions.add(expense(ledger, bruno, lazer, "189.90", month.atDay(18), "Jantar fora"));
+            transactions.add(expense(ledger, ana, lazer, "55.00", month.atDay(23), "Streaming"));
+            transactions.add(expense(ledger, bruno, saude, "140.00", month.atDay(14), "Farmácia"));
+        }
+        transactionRepository.saveAll(transactions);
+
+        log.info("demo data seeded: ledger=\"{}\" users=[{}, {}] transactions={}",
+                LEDGER_NAME, ANA_EMAIL, BRUNO_EMAIL, transactions.size());
+    }
+
+    private Category category(Ledger ledger, User createdBy, String name, String color) {
+        return Category.builder()
+                .ledger(ledger)
+                .createdBy(createdBy)
+                .name(name)
+                .color(color)
+                .build();
+    }
+
+    private Transaction income(Ledger ledger, User user, Category category, String amount, LocalDate date, String description) {
+        return transaction(ledger, user, category, Transaction.TransactionType.INCOME, amount, date, description);
+    }
+
+    private Transaction expense(Ledger ledger, User user, Category category, String amount, LocalDate date, String description) {
+        return transaction(ledger, user, category, Transaction.TransactionType.EXPENSE, amount, date, description);
+    }
+
+    private Transaction transaction(Ledger ledger, User user, Category category, Transaction.TransactionType type,
+                                    String amount, LocalDate date, String description) {
+        return Transaction.builder()
+                .ledger(ledger)
+                .createdBy(user)
+                .category(category)
+                .type(type)
+                .amount(new BigDecimal(amount))
+                .date(date)
+                .description(description)
+                .build();
+    }
+}