Senior Full-Stack Engineer

Job Title: Senior Full-Stack Engineer (AI-Powered Sales Transformation) Location: Remote About Our Company We’re redefining enterprise outbound sales through cutting-edge AI and LLM-powered agent technology. Trusted by innovators like 1Password, Fivetran, and Greenhouse, our platform transforms how sales teams generate pipeline at scale. As a category creator in AI-driven sales acceleration, we empower revenue teams to achieve unprecedented efficiency—and we’re just getting started. The Mission Join us as a Senior Full-Stack Engineer to pioneer the future of sales technology. You’ll architect and scale AI-native products that automate complex sales workflows, collaborate directly with customers to shape our roadmap, and lead technical innovation in a fast-paced, product-led environment. This is your chance to build the engine that drives revenue for tomorrow’s enterprises. What You’ll Own Full-Stack Product Leadership: Build end-to-end features across our core platform using React, TypeScript, Node.js, and Python—from AI agent orchestration to scalable data pipelines.Technical Vision: Partner with engineering leadership to define architecture, quality standards, and development processes.Mentorship: Elevate junior engineers through code reviews, best practices, and hands-on technical guidance.AI Integration: Design systems leveraging LLMs to automate sales tasks, personalization, and analytics.Customer-Centric Innovation: Ship solutions that directly impact enterprise sales teams (ideation → production → iteration).Performance Optimization: Ensure reliability, scalability, and speed across 100M+ interactions. Your Expertise 6+ years building production-grade full-stack applications (React, TypeScript, Node.js, Python).1+ year in a technical leadership role (mentoring, architectural decisions, cross-functional influence).Proven success in startups or high-growth tech environments (comfort with ambiguity, rapid iteration).Mastery of distributed systems, API design, and database optimization.Strong communicator who thrives in collaborative, product-driven teams.Hybrid Flexibility: Ability to work from our SF office 3+ days/week. Our Stack Frontend: React, TypeScript, VercelBackend: Node.js, Python, GraphQL/RESTInfra: AWS, Kubernetes, PostgreSQLAI Tooling: LLM orchestration, agent frameworks, real-time analytics Compensation & Benefits Base Salary: Up to $370,000Equity: Meaningful ownership in a high-growth ventureHealth: 100% covered medical, dental, visionFlexibility: Unlimited PTO + hybrid work modelGrowth: Annual learning stipend, leadership trainingWorkspace: Premium hardware + ergonomic setup support Our Culture Builders at Heart: Obsessed with creating category-defining products.Velocity + Rigor: Move fast but never break trust.Customer-Led: Our users’ success is our north star.One Team: Win (or learn) together—egos checked at the door. Step into a role where your code powers pipeline for the world’s most innovative companies. Ship products that redefine an industry—backed by a team that values impact over inertia. Apply Now → https://underdog.io/candidates/apply We champion diversity. Every application is reviewed by human eyes—not algorithms.