Founding Software Engineer (Remote)

About this role

About Assembly 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. About the Role 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 interfaces, you’ll own the full lifecycle—shipping fast and keeping quality high. What You’ll Do Ship features and products end-to-end, from design → implementation → release → maintenance Talk directly with customers, incorporating their feedback into the product Design and build distributed systems that scale with millions of data events Collaborate with founders and a global team, making product and technical decisions daily Continuously improve what you ship: better performance, cleaner UX, tighter integrations Technical Must-Haves High-level proficiency in Go, TypeScript, Python, Java, or C/C++ Strong experience designing and working on distributed systems Ability to translate product requirements into production-ready code independently Brownie Points (Not Required, but Encouraged) Experience or proficiency with Rust Frontend experience with React, Next.js, or similar frameworks Previous work with large-scale data ingestion, AI agents, or workflow automation What a Good Fit Looks Like You enjoy solving open-ended, challenging problems You value good design and UX (you have an eye for details) You thrive with owning end-to-end product development You can explain complex technical ideas simply You’re extremely proactive—always looking for the next improvement What We Care About Customer Obsession: Make customers love what we build, whatever it takes Beautiful Design: Software should be elegant—it’s in the details Accountability: Own things end-to-end, admit mistakes, and trust each other fully High Bar: We expect excellence—when we achieve something, we raise the bar again Open-Mindedness: We debate, disagree, and land on the best decision as a team Fun Facts Our team has experience from companies like Apple, Netflix, Convoy, and more We’re backed by Village Global, Y Combinator, the founder of Guitar Hero, and execs from Intuit & Anyscale Technology Our stack is: Backend: Go, Node.js, TypeScript Frontend: React, TailwindCSS, shadcn/ui, Lexical Database: PostgreSQL (Supabase + AWS RDS) Infra: AWS ECS, S3, River Queue, Redis We solve interesting problems around: Large-scale CRM & usage data ingestion AI-powered health scoring and workflow orchestration Two-way sync with tools like Salesforce, HubSpot, Gmail, Slack, Google Sheets, and Calendar Building collaborative inboxes, onboarding checklists, and analytics dashboards