Quantum Computing
Also written as Quantum Engineer, Quantum Algorithms, Qubit, Qiskit
Computers that use qubits, which follow the rules of quantum physics, to tackle certain problems (simulating molecules, some optimisation and cryptography problems) that ordinary computers can't solve in a reasonable time. Today's machines are still small and error-prone, so most work is research, algorithm design and error correction. IBM's Qiskit is the most common programming toolkit.
Think of it like
Not a faster car but a different vehicle: brilliant for a few specific journeys, no use for the school run.
Junior or senior?
Most real roles want a physics, maths or electrical-engineering PhD, or deep experience at a quantum hardware or research company. A Qiskit course is a start, not experience.
Senior sounds like
Can say which problem they worked on and why it suited a quantum approach.
Ask them
“What problem were you solving, did it run on real quantum hardware or a simulator, and what limited the results?”
Sounds like real experience
Names the hardware or simulator, the problem size, and a real limitation such as noise, error rates or the number of qubits available.
Probe further if
Talks in general terms about quantum being 'exponentially faster' without a specific problem or result.