diff --git a/contracts/flash_loan_guard/src/lib.rs b/contracts/flash_loan_guard/src/lib.rs
new file mode 100644
index 00000000..0a2d130c
--- /dev/null
+++ b/contracts/flash_loan_guard/src/lib.rs
@@ -0,0 +1,36 @@
+use soroban_sdk::{contract, contractimpl, contracttype, Address, Env};
+
+#[derive(Clone)]
+#[contracttype]
+pub enum DataKey {
+    DepositBlock(Address),
+}
+
+@contract
+pub struct FlashLoanGuardContract;
+
+@contractimpl
+impl FlashLoanGuardContract {
+    pub fn deposit(env: Env, user: Address) {
+        user.require_auth();
+        let current_block = env.ledger().sequence();
+        env.storage().persistent().set(&DataKey::DepositBlock(user.clone()), &current_block);
+    }
+
+    pub fn withdraw(env: Env, user: Address) {
+        user.require_auth();
+        let current_block = env.ledger().sequence();
+        
+        let deposit_block: u32 = env.storage()
+            .persistent()
+            .get(&DataKey::DepositBlock(user.clone()))
+            .unwrap_or(0);
+
+        if current_block <= deposit_block {
+            panic!("FlashLoanReentrancy: withdrawal prohibited in the same ledger block as deposit");
+        }
+
+        // Proceed with withdrawal logic...
+        env.storage().persistent().remove(&DataKey::DepositBlock(user));
+    }
+}
\ No newline at end of file
diff --git a/contracts/flash_loan_guard/src/test.rs b/contracts/flash_loan_guard/src/test.rs
new file mode 100644
index 00000000..d8a7ee49
--- /dev/null
+++ b/contracts/flash_loan_guard/src/test.rs
@@ -0,0 +1,37 @@
+#[cfg(test)]
+mod test {
+    use super::*;
+    use soroban_sdk::{Env, Address};
+
+    #[test]
+    #[should_panic(expected = "FlashLoanReentrancy")]
+    fn test_prevents_same_block_withdrawal() {
+        let env = Env::default();
+        env.mock_all_auths();
+        let contract_id = env.register(FlashLoanGuardContract, ());
+        let client = FlashLoanGuardContractClient::new(&env, &contract_id);
+        let user = Address::generate(&env);
+
+        env.ledger().set_sequence_number(100);
+        client.deposit(&user);
+
+        // Attempt withdrawal in the same block (100) -> should panic
+        client.withdraw(&user);
+    }
+
+    #[test]
+    fn test_allows_subsequent_block_withdrawal() {
+        let env = Env::default();
+        env.mock_all_auths();
+        let contract_id = env.register(FlashLoanGuardContract, ());
+        let client = FlashLoanGuardContractClient::new(&env, &contract_id);
+        let user = Address::generate(&env);
+
+        env.ledger().set_sequence_number(100);
+        client.deposit(&user);
+
+        // Advance ledger block
+        env.ledger().set_sequence_number(101);
+        client.withdraw(&user); // Should succeed without panicking
+    }
+}
\ No newline at end of file
diff --git a/contracts/yield_vault/src/lib.rs b/contracts/yield_vault/src/lib.rs
new file mode 100644
index 00000000..92461fbf
--- /dev/null
+++ b/contracts/yield_vault/src/lib.rs
@@ -0,0 +1,45 @@
+use soroban_sdk::{contract, contractimpl, Address, Env};
+
+@contract
+pub struct YieldVaultContract;
+
+@contractimpl
+impl YieldVaultContract {
+    pub fn deposit(env: Env, user: Address, token_amount: i128, min_shares_out: i128) -> i128 {
+        user.require_auth();
+
+        // Calculate shares to mint based on current vault exchange rate
+        let shares_out = Self::calculate_shares_out(&env, token_amount);
+
+        if shares_out < min_shares_out {
+            panic!("SlippageExceeded: minted shares are less than min_shares_out");
+        }
+
+        // Perform deposit accounting and token transfer...
+        shares_out
+    }
+
+    pub fn withdraw(env: Env, user: Address, shares_in: i128, min_tokens_out: i128) -> i128 {
+        user.require_auth();
+
+        // Calculate tokens to return based on current vault exchange rate
+        let tokens_out = Self::calculate_tokens_out(&env, shares_in);
+
+        if tokens_out < min_tokens_out {
+            panic!("SlippageExceeded: returned tokens are less than min_tokens_out");
+        }
+
+        // Perform withdrawal accounting and token transfer...
+        tokens_out
+    }
+
+    fn calculate_shares_out(_env: &Env, token_amount: i128) -> i128 {
+        // Mock exchange rate logic: 1:1 ratio for demonstration
+        token_amount
+    }
+
+    fn calculate_tokens_out(_env: &Env, shares_in: i128) -> i128 {
+        // Mock exchange rate logic: 1:1 ratio for demonstration
+        shares_in
+    }
+}
\ No newline at end of file
diff --git a/contracts/yield_vault/src/test.rs b/contracts/yield_vault/src/test.rs
new file mode 100644
index 00000000..d39b8a30
--- /dev/null
+++ b/contracts/yield_vault/src/test.rs
@@ -0,0 +1,30 @@
+#[cfg(test)]
+mod test {
+    use super::*;
+    use soroban_sdk::{Env, Address};
+
+    #[test]
+    fn test_deposit_slippage_success() {
+        let env = Env::default();
+        env.mock_all_auths();
+        let contract_id = env.register(YieldVaultContract, ());
+        let client = YieldVaultContractClient::new(&env, &contract_id);
+        let user = Address::generate(&env);
+
+        let shares = client.deposit(&user, &1000, &950);
+        assert_eq!(shares, 1000);
+    }
+
+    #[test]
+    #[should_panic(expected = "SlippageExceeded")]
+    fn test_deposit_slippage_revert() {
+        let env = Env::default();
+        env.mock_all_auths();
+        let contract_id = env.register(YieldVaultContract, ());
+        let client = YieldVaultContractClient::new(&env, &contract_id);
+        let user = Address::generate(&env);
+
+        // Expecting 1050 shares out when deposit yields 1000 -> should panic
+        client.deposit(&user, &1000, &1050);
+    }
+}
\ No newline at end of file