diff --git a/l1-contracts/src/core/Rollup.sol b/l1-contracts/src/core/Rollup.sol
index 87de3e243101..7c6611645063 100644
--- a/l1-contracts/src/core/Rollup.sol
+++ b/l1-contracts/src/core/Rollup.sol
@@ -585,19 +585,21 @@ contract Rollup is Leonidas, IRollup, ITestRollup {
       revert Errors.Rollup__InvalidArchive(tipArchive, _header.lastArchive.root);
     }
 
-    uint256 slot = _header.globalVariables.slotNumber;
-    if (slot > type(uint128).max) {
-      revert Errors.Rollup__SlotValueTooLarge(slot);
-    }
+    if (!isDevNet) {
+      uint256 slot = _header.globalVariables.slotNumber;
+      if (slot > type(uint128).max) {
+        revert Errors.Rollup__SlotValueTooLarge(slot);
+      }
 
-    uint256 lastSlot = uint256(blocks[pendingBlockCount - 1].slotNumber);
-    if (slot <= lastSlot) {
-      revert Errors.Rollup__SlotAlreadyInChain(lastSlot, slot);
-    }
+      uint256 lastSlot = uint256(blocks[pendingBlockCount - 1].slotNumber);
+      if (slot <= lastSlot) {
+        revert Errors.Rollup__SlotAlreadyInChain(lastSlot, slot);
+      }
 
-    uint256 timestamp = getTimestampForSlot(slot);
-    if (_header.globalVariables.timestamp != timestamp) {
-      revert Errors.Rollup__InvalidTimestamp(timestamp, _header.globalVariables.timestamp);
+      uint256 timestamp = getTimestampForSlot(slot);
+      if (_header.globalVariables.timestamp != timestamp) {
+        revert Errors.Rollup__InvalidTimestamp(timestamp, _header.globalVariables.timestamp);
+      }
     }
 
     // Check if the data is available using availability oracle (change availability oracle if you want a different DA layer)
diff --git a/l1-contracts/test/Rollup.t.sol b/l1-contracts/test/Rollup.t.sol
index a9205542fbc2..9dbb457114bf 100644
--- a/l1-contracts/test/Rollup.t.sol
+++ b/l1-contracts/test/Rollup.t.sol
@@ -296,7 +296,11 @@ contract RollupTest is DecoderBase {
 
     availabilityOracle.publish(body);
 
-    vm.expectRevert(abi.encodeWithSelector(Errors.Rollup__InvalidTimestamp.selector, realTs, badTs));
+    if (Constants.IS_DEV_NET != 1) {
+      vm.expectRevert(
+        abi.encodeWithSelector(Errors.Rollup__InvalidTimestamp.selector, realTs, badTs)
+      );
+    }
     rollup.process(header, archive, bytes32(0));
   }
 
diff --git a/yarn-project/aztec-node/src/aztec-node/server.ts b/yarn-project/aztec-node/src/aztec-node/server.ts
index fd53a10894e0..dfe50773692f 100644
--- a/yarn-project/aztec-node/src/aztec-node/server.ts
+++ b/yarn-project/aztec-node/src/aztec-node/server.ts
@@ -57,7 +57,13 @@ import { getCanonicalFeeJuice } from '@aztec/protocol-contracts/fee-juice';
 import { getCanonicalInstanceDeployer } from '@aztec/protocol-contracts/instance-deployer';
 import { getCanonicalKeyRegistryAddress } from '@aztec/protocol-contracts/key-registry';
 import { getCanonicalMultiCallEntrypointAddress } from '@aztec/protocol-contracts/multi-call-entrypoint';
-import { AggregateTxValidator, DataTxValidator, GlobalVariableBuilder, SequencerClient } from '@aztec/sequencer-client';
+import {
+  AggregateTxValidator,
+  DataTxValidator,
+  type GlobalVariableBuilder,
+  SequencerClient,
+  createGlobalVariableBuilder,
+} from '@aztec/sequencer-client';
 import { PublicProcessorFactory, WASMSimulator, createSimulationProvider } from '@aztec/simulator';
 import { type TelemetryClient } from '@aztec/telemetry-client';
 import { NoopTelemetryClient } from '@aztec/telemetry-client/noop';
@@ -195,7 +201,7 @@ export class AztecNodeService implements AztecNode {
       sequencer,
       ethereumChain.chainInfo.id,
       config.version,
-      new GlobalVariableBuilder(config),
+      createGlobalVariableBuilder(config),
       store,
       txValidator,
       telemetry,
diff --git a/yarn-project/aztec/src/sandbox.ts b/yarn-project/aztec/src/sandbox.ts
index c50bae061427..4f00c6bfe793 100644
--- a/yarn-project/aztec/src/sandbox.ts
+++ b/yarn-project/aztec/src/sandbox.ts
@@ -3,6 +3,7 @@ import { type AztecNodeConfig, AztecNodeService, getConfigEnvVars } from '@aztec
 import { SignerlessWallet } from '@aztec/aztec.js';
 import { DefaultMultiCallEntrypoint } from '@aztec/aztec.js/entrypoint';
 import { type AztecNode } from '@aztec/circuit-types';
+import { IS_DEV_NET } from '@aztec/circuits.js';
 import { deployCanonicalAuthRegistry, deployCanonicalKeyRegistry, deployCanonicalL2FeeJuice } from '@aztec/cli/misc';
 import {
   type DeployL1Contracts,
@@ -133,6 +134,7 @@ export async function deployContractsToL1(
       vkTreeRoot: getVKTreeRoot(),
       assumeProvenUntil: opts.assumeProvenUntilBlockNumber,
       salt: undefined,
+      blockInterval: IS_DEV_NET ? undefined : 12,
     }),
   );
 
diff --git a/yarn-project/cli/src/utils/aztec.ts b/yarn-project/cli/src/utils/aztec.ts
index ec413f2689d3..a572cf6a3b65 100644
--- a/yarn-project/cli/src/utils/aztec.ts
+++ b/yarn-project/cli/src/utils/aztec.ts
@@ -1,6 +1,7 @@
 import { type ContractArtifact, type FunctionArtifact, loadContractArtifact } from '@aztec/aztec.js/abi';
 import { type L1ContractArtifactsForDeployment } from '@aztec/aztec.js/ethereum';
 import { type PXE } from '@aztec/circuit-types';
+import { IS_DEV_NET } from '@aztec/circuits.js';
 import { type DeployL1Contracts } from '@aztec/ethereum';
 import { type EthAddress } from '@aztec/foundation/eth-address';
 import { type DebugLogger, type LogFn } from '@aztec/foundation/log';
@@ -118,6 +119,7 @@ export async function deployAztecContracts(
     l2FeeJuiceAddress: FeeJuiceAddress,
     vkTreeRoot: getVKTreeRoot(),
     salt,
+    blockInterval: IS_DEV_NET ? undefined : 12,
   });
 }
 
diff --git a/yarn-project/end-to-end/src/fixtures/setup_l1_contracts.ts b/yarn-project/end-to-end/src/fixtures/setup_l1_contracts.ts
index 4cc48f528fa4..2a0bcea67876 100644
--- a/yarn-project/end-to-end/src/fixtures/setup_l1_contracts.ts
+++ b/yarn-project/end-to-end/src/fixtures/setup_l1_contracts.ts
@@ -1,4 +1,5 @@
 import { type DebugLogger, type L1ContractArtifactsForDeployment, deployL1Contracts } from '@aztec/aztec.js';
+import { IS_DEV_NET } from '@aztec/circuits.js';
 import {
   AvailabilityOracleAbi,
   AvailabilityOracleBytecode,
@@ -63,6 +64,7 @@ export const setupL1Contracts = async (
     l2FeeJuiceAddress: FeeJuiceAddress,
     vkTreeRoot: getVKTreeRoot(),
     salt: undefined,
+    blockInterval: IS_DEV_NET ? undefined : 12,
   });
 
   return l1Data;
diff --git a/yarn-project/end-to-end/src/fixtures/utils.ts b/yarn-project/end-to-end/src/fixtures/utils.ts
index a065b2037b1c..9ba27259634e 100644
--- a/yarn-project/end-to-end/src/fixtures/utils.ts
+++ b/yarn-project/end-to-end/src/fixtures/utils.ts
@@ -33,6 +33,7 @@ import {
   CANONICAL_AUTH_REGISTRY_ADDRESS,
   CANONICAL_KEY_REGISTRY_ADDRESS,
   GasSettings,
+  IS_DEV_NET,
   MAX_PACKED_PUBLIC_BYTECODE_SIZE_IN_FIELDS,
   computeContractAddressFromInstance,
   getContractClassFromArtifact,
@@ -151,6 +152,7 @@ export const setupL1Contracts = async (
     l2FeeJuiceAddress: FeeJuiceAddress,
     vkTreeRoot: getVKTreeRoot(),
     salt: args.salt,
+    blockInterval: IS_DEV_NET ? undefined : 12,
   });
 
   return l1Data;
diff --git a/yarn-project/ethereum/src/deploy_l1_contracts.ts b/yarn-project/ethereum/src/deploy_l1_contracts.ts
index bf4d2b004479..701783583df5 100644
--- a/yarn-project/ethereum/src/deploy_l1_contracts.ts
+++ b/yarn-project/ethereum/src/deploy_l1_contracts.ts
@@ -147,7 +147,13 @@ export const deployL1Contracts = async (
   chain: Chain,
   logger: DebugLogger,
   contractsToDeploy: L1ContractArtifactsForDeployment,
-  args: { l2FeeJuiceAddress: AztecAddress; vkTreeRoot: Fr; assumeProvenUntil?: number; salt: number | undefined },
+  args: {
+    blockInterval: number | undefined;
+    l2FeeJuiceAddress: AztecAddress;
+    vkTreeRoot: Fr;
+    assumeProvenUntil?: number;
+    salt: number | undefined;
+  },
 ): Promise<DeployL1Contracts> => {
   // We are assuming that you are running this on a local anvil node which have 1s block times
   // To align better with actual deployment, we update the block interval to 12s
@@ -161,13 +167,13 @@ export const deployL1Contracts = async (
     };
     return await (await fetch(rpcUrl, content)).json();
   };
-  if (chain.id == foundry.id) {
-    const interval = 12;
-    const res = await rpcCall(rpcUrl, 'anvil_setBlockTimestampInterval', [interval]);
+
+  if (chain.id == foundry.id && args.blockInterval !== undefined) {
+    const res = await rpcCall(rpcUrl, 'anvil_setBlockTimestampInterval', [args.blockInterval]);
     if (res.error) {
       throw new Error(`Error setting block interval: ${res.error.message}`);
     }
-    logger.info(`Set block interval to ${interval}`);
+    logger.info(`Set block interval to ${args.blockInterval}`);
   }
 
   logger.info(`Deploying contracts from ${account.address.toString()}...`);
diff --git a/yarn-project/sequencer-client/src/client/sequencer-client.ts b/yarn-project/sequencer-client/src/client/sequencer-client.ts
index 02e173299815..65172f8e3c4c 100644
--- a/yarn-project/sequencer-client/src/client/sequencer-client.ts
+++ b/yarn-project/sequencer-client/src/client/sequencer-client.ts
@@ -8,7 +8,7 @@ import { type WorldStateSynchronizer } from '@aztec/world-state';
 
 import { BlockBuilderFactory } from '../block_builder/index.js';
 import { type SequencerClientConfig } from '../config.js';
-import { GlobalVariableBuilder } from '../global_variable_builder/index.js';
+import { createGlobalVariableBuilder } from '../global_variable_builder/index.js';
 import { L1Publisher } from '../publisher/index.js';
 import { Sequencer, type SequencerConfig } from '../sequencer/index.js';
 import { TxValidatorFactory } from '../tx_validator/tx_validator_factory.js';
@@ -44,7 +44,7 @@ export class SequencerClient {
     telemetryClient: TelemetryClient,
   ) {
     const publisher = new L1Publisher(config, telemetryClient);
-    const globalsBuilder = new GlobalVariableBuilder(config);
+    const globalsBuilder = createGlobalVariableBuilder(config);
     const merkleTreeDb = worldStateSynchronizer.getLatest();
 
     const publicProcessorFactory = new PublicProcessorFactory(
diff --git a/yarn-project/sequencer-client/src/global_variable_builder/devnet_global_builder.ts b/yarn-project/sequencer-client/src/global_variable_builder/devnet_global_builder.ts
new file mode 100644
index 000000000000..1e0294848364
--- /dev/null
+++ b/yarn-project/sequencer-client/src/global_variable_builder/devnet_global_builder.ts
@@ -0,0 +1,75 @@
+import { type AztecAddress, type EthAddress, GasFees, GlobalVariables } from '@aztec/circuits.js';
+import { type L1ReaderConfig, createEthereumChain } from '@aztec/ethereum';
+import { Fr } from '@aztec/foundation/fields';
+import { createDebugLogger } from '@aztec/foundation/log';
+import { RollupAbi } from '@aztec/l1-artifacts';
+
+import {
+  type GetContractReturnType,
+  type HttpTransport,
+  type PublicClient,
+  createPublicClient,
+  getAddress,
+  getContract,
+  http,
+} from 'viem';
+import type * as chains from 'viem/chains';
+
+/**
+ * Simple global variables builder for devnet. Uses current timestamp and slots equal to block numbers.
+ */
+export class DevnetGlobalVariableBuilder {
+  private log = createDebugLogger('aztec:sequencer:devnet_global_variable_builder');
+
+  private rollupContract: GetContractReturnType<typeof RollupAbi, PublicClient<HttpTransport, chains.Chain>>;
+  private publicClient: PublicClient<HttpTransport, chains.Chain>;
+
+  constructor(config: L1ReaderConfig) {
+    const { l1RpcUrl, l1ChainId: chainId, l1Contracts } = config;
+
+    const chain = createEthereumChain(l1RpcUrl, chainId);
+
+    this.publicClient = createPublicClient({
+      chain: chain.chainInfo,
+      transport: http(chain.rpcUrl),
+    });
+
+    this.rollupContract = getContract({
+      address: getAddress(l1Contracts.rollupAddress.toString()),
+      abi: RollupAbi,
+      client: this.publicClient,
+    });
+  }
+
+  /**
+   * Simple builder of global variables that use the minimum time possible.
+   * @param blockNumber - The block number to build global variables for.
+   * @param coinbase - The address to receive block reward.
+   * @param feeRecipient - The address to receive fees.
+   * @returns The global variables for the given block number.
+   */
+  public async buildGlobalVariables(
+    blockNumber: Fr,
+    coinbase: EthAddress,
+    feeRecipient: AztecAddress,
+  ): Promise<GlobalVariables> {
+    const version = new Fr(await this.rollupContract.read.VERSION());
+    const chainId = new Fr(this.publicClient.chain.id);
+    const timestamp = new Fr(Math.floor(Date.now() / 1000));
+    const slot = blockNumber;
+
+    const gasFees = GasFees.default();
+    const globalVariables = new GlobalVariables(
+      chainId,
+      version,
+      blockNumber,
+      slot,
+      timestamp,
+      coinbase,
+      feeRecipient,
+      gasFees,
+    );
+    this.log.debug(`Built global variables for block ${blockNumber}`, globalVariables.toJSON());
+    return globalVariables;
+  }
+}
diff --git a/yarn-project/sequencer-client/src/global_variable_builder/index.ts b/yarn-project/sequencer-client/src/global_variable_builder/index.ts
index 5669a0412ae4..ae6d8ea1439f 100644
--- a/yarn-project/sequencer-client/src/global_variable_builder/index.ts
+++ b/yarn-project/sequencer-client/src/global_variable_builder/index.ts
@@ -1 +1,19 @@
-export { GlobalVariableBuilder } from './global_builder.js';
+import { type AztecAddress, type EthAddress, type GlobalVariables } from '@aztec/circuits.js';
+import { IS_DEV_NET } from '@aztec/circuits.js';
+import { type L1ReaderConfig } from '@aztec/ethereum';
+import { type Fr } from '@aztec/foundation/fields';
+
+import { DevnetGlobalVariableBuilder } from './devnet_global_builder.js';
+import { SimpleGlobalVariableBuilder } from './simple_global_builder.js';
+
+export { DevnetGlobalVariableBuilder } from './devnet_global_builder.js';
+export { SimpleGlobalVariableBuilder } from './simple_global_builder.js';
+
+export function createGlobalVariableBuilder(config: L1ReaderConfig): GlobalVariableBuilder {
+  return IS_DEV_NET ? new DevnetGlobalVariableBuilder(config) : new SimpleGlobalVariableBuilder(config);
+}
+
+/** Builds global variables for a block. */
+export interface GlobalVariableBuilder {
+  buildGlobalVariables(blockNumber: Fr, coinbase: EthAddress, feeRecipient: AztecAddress): Promise<GlobalVariables>;
+}
diff --git a/yarn-project/sequencer-client/src/global_variable_builder/global_builder.ts b/yarn-project/sequencer-client/src/global_variable_builder/simple_global_builder.ts
similarity index 98%
rename from yarn-project/sequencer-client/src/global_variable_builder/global_builder.ts
rename to yarn-project/sequencer-client/src/global_variable_builder/simple_global_builder.ts
index f37db0af1cd8..c189a93932ac 100644
--- a/yarn-project/sequencer-client/src/global_variable_builder/global_builder.ts
+++ b/yarn-project/sequencer-client/src/global_variable_builder/simple_global_builder.ts
@@ -24,7 +24,7 @@ import type * as chains from 'viem/chains';
 /**
  * Simple global variables builder.
  */
-export class GlobalVariableBuilder {
+export class SimpleGlobalVariableBuilder {
   private log = createDebugLogger('aztec:sequencer:global_variable_builder');
 
   private rollupContract: GetContractReturnType<typeof RollupAbi, PublicClient<HttpTransport, chains.Chain>>;
diff --git a/yarn-project/sequencer-client/src/sequencer/sequencer.test.ts b/yarn-project/sequencer-client/src/sequencer/sequencer.test.ts
index 9f4f79046fa2..3f6ff1a99be4 100644
--- a/yarn-project/sequencer-client/src/sequencer/sequencer.test.ts
+++ b/yarn-project/sequencer-client/src/sequencer/sequencer.test.ts
@@ -35,7 +35,7 @@ import { type MerkleTreeOperations, WorldStateRunningState, type WorldStateSynch
 import { type MockProxy, mock, mockFn } from 'jest-mock-extended';
 
 import { type BlockBuilderFactory } from '../block_builder/index.js';
-import { type GlobalVariableBuilder } from '../global_variable_builder/global_builder.js';
+import { type GlobalVariableBuilder } from '../global_variable_builder/index.js';
 import { type L1Publisher } from '../publisher/l1-publisher.js';
 import { TxValidatorFactory } from '../tx_validator/tx_validator_factory.js';
 import { Sequencer } from './sequencer.js';
diff --git a/yarn-project/sequencer-client/src/sequencer/sequencer.ts b/yarn-project/sequencer-client/src/sequencer/sequencer.ts
index 1fe8fa5f52c1..557370614910 100644
--- a/yarn-project/sequencer-client/src/sequencer/sequencer.ts
+++ b/yarn-project/sequencer-client/src/sequencer/sequencer.ts
@@ -22,7 +22,7 @@ import { type ValidatorClient } from '@aztec/validator-client';
 import { type WorldStateStatus, type WorldStateSynchronizer } from '@aztec/world-state';
 
 import { type BlockBuilderFactory } from '../block_builder/index.js';
-import { type GlobalVariableBuilder } from '../global_variable_builder/global_builder.js';
+import { type GlobalVariableBuilder } from '../global_variable_builder/index.js';
 import { type L1Publisher } from '../publisher/l1-publisher.js';
 import { type TxValidatorFactory } from '../tx_validator/tx_validator_factory.js';
 import { type SequencerConfig } from './config.js';