Senior Software Engineer - Amplify

Location: Boston

This job is with Klaviyo, an inclusive employer and a member of my Gwork – the largest global platform for the LGBTQ+ business community. Please do not contact the recruiter directly.

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying.

Want to learn more about life at Klaviyo? Visit  to see how we empower creators to own their own destiny.

Team Overview:

The Amplify Engineering team builds internal tools, platforms, and AI-powered automation that help Klaviyos work more efficiently and at scale as the company grows. We partner across the organization, including Sales, Marketing, Engineering & Product, Customer Service & Success, and Finance, 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. We operate in tight feedback loops with our internal customers, shipping quickly, learning fast, and seeing the impact of our work immediately in how deals move faster, tickets resolve sooner, and launches go more smoothly.

This role is for senior engineers who enjoy turning real-world problems into reliable, scalable solutions. The work is highly visible and has a direct impact on how thousands of Klaviyos get their work done every day.

How You’ll Make an Impact:

The Amplify team builds the internal platforms, automation, and AI-driven systems that power how Klaviyos work every day. As a Senior Software Engineer on Amplify, you will:

Design, build, and own complex internal products and platforms, including internal web applications, APIs, data and event pipelines, and AI-powered workflows that directly impact how Sales, Marketing, Customer Service & Success, R&D, and Finance teams operate day to day.

Independently lead the end-to-end lifecycle of projects and features – from discovery and design through implementation, rollout, and long-term ownership.

Translate real operational problems into scalable, maintainable solutions. You’ll partner closely with internal customers to understand their workflows and constraints, then design pragmatic, AI-first software that measurably improves throughput, quality, and reliability of their work.

Own the technical and architectural evolution of parts of the Amplify platform, anticipating scalability, reliability, and observability needs as usage grows and as Klaviyo’s AI strategy evolves.

Establish, refine, and uphold SLOs and operational health for the systems you own, ensuring they are reliable, observable, and fit for internal customer needs, including incidents, on-call participation, and follow-through on RCA actions.

Drive an AI-first engineering workflow. You’ll use modern AI tools (e.g., OpenAI/Anthropic/Gemini models, Claude Code, Cursor, Copilot, etc.) for design, coding, testing, and documentation, and help define best practices for how Amplify engineers use AI to safely and efficiently ship software.

Create and evolve shared patterns, tools, and processes that make it easier for Amplify and adjacent teams to build internal tools and AI agents consistently and at high quality (e.g., templates, SDKs, integration patterns, evaluation harnesses, observability standards).

Mentor and uplevel other engineers on the team through design reviews, pairing, feedback on technical documents, and by modeling excellent engineering practices that leave the codebase, systems, and processes better than you found them.

Collaborate deeply with Product, Design, Data, and operational stakeholders to define requirements, trade-offs, and success metrics, ensuring Amplify’s systems are solving the highest-value problems with clear, measurable outcomes.

Transform workflows by…