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Assembly is building the next-generation post-sales platform for B2B companies. Customer Success and post-sales teams rely on Assembly to unify data from dozens of tools, proactively surface risks and opportunities, and power agentic workflows that drive retention and expansion. With Assembly, companies can finally move beyond reactive account management—our AI-powered platform helps CSMs catch signals before they become churn, automates onboarding milestones, and turns scattered systems into a single source of truth. We’re backed by Y Combinator and leading investors, and already powering post-sales operations for fast-growing companies across fintech, SaaS, and enterprise software. Our team is small but ambitious—join us to help define the future of customer success infrastructure. As a Senior Full Stack Engineer at Assembly, you’ll be shipping products from 0 → 1 and owning them in production. We’re a customer-obsessed team, so you won’t just write code—you’ll talk to customers, gather feedback, and iterate quickly. This isn’t a narrow role: you’ll often be the sole architect, designer, and engineer on systems across our stack. From backend data pipelines to customer-facing inte