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Text-to-speech (TTS) services have become a popular tool for making content more accessible, providing convenience for users who prefer listening to their text rather than reading it. One of the most well-known TTS platforms is Speechify, which converts digital text, including PDFs, into high-quality audio. When I embarked on building a PDF text-to-speech service similar to Speechify, I faced several challenges and opportunities. In this article, I’ll take you through the steps of how I system-designed this service, from understanding user needs to choosing the right technology stack and scaling the solution.