Worked on the lambdaclass/ethereum_rust repository to deliver gas-aware parallelization improvements for the LEVM backend using Rust. Focused on backend development and parallel processing, the work introduced block gas-aware parallel transaction execution and receipts generation, ensuring that each transaction’s gas usage was validated against the remaining block gas. The implementation aligned the parallel execution path with the sequential LEVM gas accounting logic, enforcing gas limits and preventing overspending in later transactions. Regression tests were added to reinforce reliability under block gas constraints, and all changes were validated with comprehensive Rust-based testing, resulting in improved throughput and more robust gas accounting.