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Abstract: We explore the impact of quantum coherence on heat-to-work conversion by a resonantly driven emitter embedded in a waveguide. An engineered bath prepares the emitter in arbitrary superpositions of energy states, acting as a source of energy and coherence. Work is extracted as the coherent fraction of light emitted by the atom in the waveguide, while heat is dissipated through the dipole fluctuations. In the stimulated regime of driving, quantum coherence boosts power extraction. In the spontaneous regime, it allows controlling the engine's yield, acting as a genuinely quantum resource. The device can be implemented with state of the art artificial atoms coupled to superconducting or semiconducting circuits, opening new routes for experimental quantum thermodynamics.