Senior Lead AI Software Engineer

Team Overview

The Amplify Engineering team builds internal tools, platforms, and AI‑powered automation that help Klaviyos work more efficiently and  partner across the organization—including Sales, Marketing, Engineering & Product, and Customer Service & Success—to solve real operational problems with practical, well‑designed software. Our work spans internal applications, 3rd‑party integrations, interactive dashboards, CMS integrations, and robust AI systems and agents that automate repetitive tasks, surface the right information at the right time, and help teams make better decisions.

• Independently own and drive high‑impact objectives that span multiple Amplify teams and align with company priorities, defining the technical roadmap that ensures our internal applications, APIs, data and event pipelines, and AI‑powered workflows can scale with Klaviyo and continue delivering measurable business outcomes.
• Be accountable, in partnership with Engineering Managers, for the long‑term technical health of Amplify’s systems—quality, reliability, scalability, cost, and security—across a significant slice of Klaviyo engineering, maintaining strong system‑level thinking across interconnected internal platforms.
• Independently lead the end‑to‑end lifecycle of large, multi‑team initiatives with clear technical direction, architectural leadership, and active workstream curation, from discovery and design through implementation, rollout, and long‑term ownership of complex programs that span internal customers across the company.
• Make high‑judgment architectural calls in ambiguous situations, committing decisively even when facing disagreement, and use prototypes and reference implementations to de‑risk decisions before broader investment.
• Establish shared standards, patterns, and reference implementations that multiply team effectiveness across Amplify and adjacent engineering teams, and proactively redirect efforts away from low‑leverage approaches and toward higher‑impact solutions when projects are off‑course.
• Define and communicate forward‑looking technical strategy that integrates input from Product, Design, Data, and operational partners, and use that strategy to lead technical discussions and influence the roadmaps of adjacent teams whose work intersects with Amplify.
• Set the standard for AI‑native engineering  modern AI tools—coding assistants, agentic workflows, RAG pipelines, and evaluation harnesses—as a core part of your day‑to‑day workflow, define guardrails for building AI‑powered systems responsibly, and help the broader engineering organization adopt AI effectively in design, coding, testing, and operations.
• Own the response to complex performance, scalability, and reliability issues across Amplify systems, working side by side with teams in the trenches during incidents, owning mistakes, and turning post‑incident learnings into changes that prevent recurrence and raise the bar across the organization.
• Define and own the operational standards Amplify holds itself to, including SLOs, monitoring and alerting, incident response, security, observability, and cost, and continuously evolve them as usage and complexity grow.
• Get work done primarily through influence, delegation, and clarity, providing clear technical direction and creating the patterns, platforms, and de‑risked references that let dozens of engineers across Amplify move quickly and safely.
• Invest in the growth of engineers across levels at Amplify, with a particular focus on developing emerging Senior and Lead engineers through design reviews, pairing, RFC feedback, and intentional one‑on‑one coaching, and participate actively in senior engineering hiring to represent Klaviyo’s technical challenges and culture.
• Connect technical work to customer outcomes and business objectives, ensuring Amplify is investing in the highest‑leverage opportunities and that engineering practices advance with measurable, multiplicative impact across the organization.

• You are passionate about building software effectively and for the long term, balancing technical quality, velocity, and business impact, and you are comfortable…