Top Tech Jobs & Startup Jobs in Boston, MA

As a Senior Software Engineer, you'll design and build scalable systems for customer data management, ensuring seamless user experiences and mentoring team members.

Lead Klaviyo's infrastructure security architecture and programs: IAM, secrets management, network segmentation, vulnerability management, and security tooling. Build IaC guardrails, define security SLOs and compliance posture, run threat modeling and design reviews, embed controls into CI/CD and observability, and deliver code/automation while mentoring senior engineers. Drive AI-enabled security automation and audit readiness for SOC 2/ISO 27001.

Design and implement user-facing product and onboarding improvements, run and analyze A/B tests, collaborate cross-functionally, improve experimentation and development processes, mentor engineers, and define safe, performant AI agent goals. Hybrid role based in Boston (≥3 days/week).

Lead design and delivery of Klaviyo's scalable data platform (streaming, batch, lakehouse, governance). Define SLOs, author ADRs/RFCs, implement ingestion/CDC, processing, storage, catalog/lineage and access controls. Optimize performance/cost, apply ML/GenAI to data workflows, partner with product/analytics, contribute code/reviews, and mentor senior engineers to enable reliable, multi‑tenant data at scale.

Lead architecture and implementation of Klaviyo's Customer Agent platform: design scalable agentic/LLM systems, drive technical strategy, ship AI-powered features, ensure reliability and observability, mentor engineers, and partner cross-functionally to deliver conversational AI at scale.

Lead architecture and implementation of Klaviyo's Customer Agent platform. Drive technical strategy for conversational AI at scale, ship AI-powered features, ensure reliability and observability, mentor engineers, and collaborate cross-functionally to evaluate emerging AI technologies and influence platform direction.

Design end-to-end product experiences for Klaviyo's platform, translate complex workflows into clear solutions, prototype (including AI-assisted), apply design systems, collaborate with PM and engineering, and conduct user research and usability testing to validate designs.

Own end-to-end architecture for Klaviyo's partner systems, translating business needs into diagrams, data models, and design docs. Build and ship Apex, LWC, Flow, and complex integrations, maintain reusable assets in GitHub, run architecture and PR reviews, refine backlog with Product Owner, and mentor developers while serving as domain expert for GTM stakeholders.

Own and deliver Salesforce solutions (Apex, LWC, Flow) and integrations across the GTM stack. Build and maintain the partner portal and payments integrations, ensure secure data flows and platform health, triage high-impact issues, apply engineering best practices, use AI tools to accelerate development, and mentor junior developers.

Partner with HR and business leaders to deliver timely people insights and storytelling. Own employee listening, retention and quality-of-hire analyses, comp and performance cycle support, headcount planning, Snowflake data work, and build self-serve dashboards and AI-driven automation to scale decision-making.