Senior Lead Engineer — AI Agent Platform (Equity)

Triwill Group; Boston (MA); On-site; USD 216,000 - 324,000; Full time

Job summary

Klaviyo in Boston is seeking a Senior Lead Engineer for Customer Agent, our AI-native platform that enables brands to engage customers at scale. You will shape tech strategy, lead architecture, and partner with product, design, data science, and engineering leaders to deliver enterprise‑grade AI experiences.

You are a hands-on technical leader with 12+ years in production systems, expert in backend and distributed systems, and adept at steering multi‑quarter initiatives, mentoring engineers, and

Qualifications

• 12+ years of software engineering experience building and operating production systems at scale.
• Significant experience designing and shipping customer-facing AI-powered products or agentic systems.
• Strong backend engineering and distributed systems fundamentals, with the ability to reason about scale, latency, reliability, and operational tradeoffs.
• Demonstrated expertise with modern AI architectures, including LLM-powered applications, retrieval systems, agent workflows, orchestration, evaluation frameworks, and guardrails.
• Proven ability to lead complex, multi-quarter technical initiatives involving multiple teams and stakeholders.
• Strong product instincts and the ability to connect technical decisions to customer and business outcomes.

Responsibilities

• Lead the architecture, design, and implementation of Customer Agent’s core platform and AI capabilities.
• Drive technical strategy and long-term system evolution for conversational AI experiences serving millions of users.
• Build and ship complex AI-powered product features, balancing speed, quality, reliability, and customer impact.
• Partner closely with Product, Design, Data Science, GTM, and Engineering leaders to define product direction and execution plans.
• Mentor engineers through technical leadership, design reviews, architecture discussions, and hands-on collaboration.
• Evaluate emerging AI technologies and frameworks, identifying opportunities to create meaningful customer value.

Skills

Software engineering

Distributed systems

Backend development

AI architectures

Technical leadership

Mentorship

Communication

Hands-on coding

Job description

Klaviyo in Boston is seeking a Senior Lead Engineer for Customer Agent, our AI-native platform that enables brands to engage customers at scale. You will shape tech strategy, lead architecture, and partner with product, design, data science, and engineering leaders to deliver enterprise‑grade AI experiences.

You are a hands-on technical leader with 12+ years in production systems, expert in backend and distributed systems, and adept at steering multi‑quarter initiatives, mentoring engineers, and