Many efforts around the world are now pursuing the ambitious goal of building the world’s first large-scale, fault-tolerant quantum computing. Consistent themes are emerging across the field, as teams attempt to scale from existing small systems to the millions of qubits needed for useful applications. Systems partitioning, manufacturability, cooling power, networking, and control electronics are recurring challenges across all qubit technologies. PsiQuantum has pursued a photonic approach, based on qubits implemented using optical photons propagating in lithographically fabricated waveguides. In this talk I will give a broad overview of recent progress, framed against these major scaling challenges. We will describe the basic requirements for photonic quantum computing, the advantages and disadvantages of our approach, and the current state of maturity of the technology.