Software Engineer II Amplify

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 software 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 Youll Make an Impact:

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

• Design build and maintain internal products and platforms including internal web applications APIs data and event pipelines and AI-powered workflows used daily by Sales Marketing Customer Service & Success R&D and Finance teams. Youll own features and small-to-medium projects end-to-end from design through deployment and iteration.
• Execute and deliver projects with increasing autonomy and complexity. You will decompose projects into actionable workstreams question and refine requirements and collaborate with teammates to ship high-quality solutions that meet reliability and performance expectations.
• Translate real operational problems into pragmatic maintainable software. Youll work closely with internal customers to understand their workflows and constraints then design AI-forward tools and automations that measurably improve throughput quality and reliability of their work.
• Contribute to the technical and architectural evolution of Amplifys systems. Youll help evolve our internal platforms services and AI workflows contributing to design decisions patterns and improvements that keep our systems scalable observable and reliable as usage grows.
• Own the quality and operational health of the code you ship. Youll be responsible for the full lifecycle of your work implementation testing deployment monitoring and follow-up improvements including debugging issues in development and production and participating in on-call rotations for the systems your team owns.
• Use modern AI tools as part of your day-to-day engineering workflow. Youll leverage AI for coding testing documentation and experimentation (e.g. LLMs AI coding assistants internal AI platforms) and share what works well so the team can continuously improve its AI-augmented workflows.
• Improve the developer experience and engineering practices on Amplify. Youll help refine our tooling tests CI/CD and automation and contribute to shared patterns and utilities that make it easier for Amplify to build internal tools and workflows consistently and at high quality.
• Collaborate deeply with Product Design Data and operational stakeholders. Youll contribute to technical discovery help evaluate trade-offs and ensure were solving the right problems with clear success criteria tying your work directly to measurable business and customer outcomes.

Who You Are:

• You are passionate about building software effectively and for the long term balancing technical quality velocity and business impact.
• BA or BS Degree in Computer Science related field or equivalent experience.
• You typically bring 3-5 years of hands-on software development experience building and operating highly available full-stack or backend-heavy SaaS products platforms or internal tools at scale or have demonstrated equivalent proficiency and impact.
• You reliably execute and deliver feature and project work autonomously. Youre comfortable taking a well-defined feature or small-to-medium project from requirements and design through implementation testing rollout and maintenance asking for guidance when needed but not waiting to be unblocked.
• You can question and refine requirements and drill down to core problems. Youre able to work with PMs and stakeholders to clarify scope identify edge cases and propose pragmatic solutions that balance complexity risk and impact.
• You have solid experience in at least one area of modern web architecture (e.g. backend services data pipelines internal tools integrations or AI-enabled workflows) and a good understanding of how to design systems that are secure scalable and maintainable.
• You are an AI-forward engineer. You are comfortable using AI tools (e.g. OpenAI/Anthropic/Gemini models Claude Code Cursor Copilot etc.) to accelerate development improve code quality and explore solutions and youre excited to deepen your AI fluency over time.
• You care about operational excellence. Youre comfortable debugging issues in development and production adding logs and metrics improving tests and working within SLOs and reliability goals. Youre willing to participate in on-call rotations and follow through on incidents and RCAs for your areas of ownership.
• You are a strong communicator and collaborator. You contribute thoughtfully in technical discussions at the project level write clear tickets and lightweight design docs and keep your team and stakeholders up to date on progress risks and trade-offs.
• You enjoy working on small autonomous agile teams and shipping early and often pairing with product managers business stakeholders and other engineers to craft better software.
• You like to question convention and proactively find ways to improve whether thats workflows architecture tooling or team processes. Youre intrinsically motivated to drive incremental improvements that deliver value to the business.

Nice to Have:

• Experience building internal tools platforms or automations for developers and/or non-technical stakeholders with a track record of improving reliability productivity or operational efficiency.
• Hands-on experience in full-stack environments including diagnosing and improving application performance database queries and complex multi-service workflows.
• Practical experience building or integrating AI-powered systems and agents; e.g. workflows using LLM APIs/SDKs agentic or automated workflows RAG pipelines or evaluation/monitoring frameworks.
• Familiarity with cloud infrastructure (AWS preferred) infrastructure-as-code (Terraform) and containerized environments (Kubernetes) including how to design services that run reliably at scale in those environments.

Technologies We Use:

Klaviyos platform is primarily built with Python and React and runs on AWS. Engineers join us from a wide range of technical backgrounds and are supported in learning our stack. Core technologies include:

• Python / Django / FastAPI
• Typescript / React
• MySQL / Redis / Memcached
• RabbitMQ / Celery / Apache Kafka / Apache Pulsar
• AWS / Terraform / Kubernetes

Location & Work Model:

This role is based in Boston Massachusetts and follows a hybrid working model. Klaviyo supports work authorization and relocation for this position.

At Klaviyo we enjoy tackling meaningful engineering challenges and value people who take ownership learn continuously and collaborate openly. We are committed to building inclusive teams and encourage applications from candidates of all backgrounds.

Klaviyo is growing fast and we have openings for all skill levels across all of our teams. Learn more about our engineering culture at

We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3 2025.

Please see the independent bias audit report covering our use of Covey here

Required Experience:

IC