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There is not support for refunds and gas does not affect balances.
For example writing a zero to a storage slot that previously had a non-zero value will refund some gas at the end of the transaction, to some extent.
Implement ant test all aspects of refund and gas spending(gas vs balance) in manticore EVM implementation. Research, implement the all needed parts at every related instruction and add tests for everything.
A transaction should spend the gas x price from the caller account balance when appropiate.
The refund should be calculated and added to the balance when needed.
All should accept both symbolic and concrete gas/refunds avoiding concretization or explaining why it is unavoidable.
Integration examples that showcase the change in the balance should be included.
Unittest for the changed intructions for different forks should be added
Experience with Python 3.6
Experience with Solidity smart contracts
Experience with EVM bytecode smart contracts
Experience with yellow papering.
No experience with Slither is required, but it would be a plus