Remote Senior Software Engineer — Build Scalable SaaS

Firstup is seeking an experienced software engineer to build scalable SaaS applications end-to-end across frontend, backend, and data layers. You will write production-grade code, conduct reviews, and design future-ready architectures while improving reliability and performance.

You will mentor engineers, advocate for quality, leverage AI-assisted tools, and collaborate with Product and Design to deliver intuitive user interfaces and robust systems.

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