Senior Software Engineer - Profiles, Identity, Consent

<div class="content-intro"><p><em>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 <a class="_ymio1r31 _ypr0glyw _zcxs1o36 _mizu194a _1ah3dkaa _ra3xnqa1 _128mdkaa _1cvmnqa1 _4davt94y _4bfu18uv _1hms8stv _ajmmnqa1 _vchhusvi _kqswh2mm _ect4ttxp _syaz13af _1a3b18uv _4fpr8stv _5goinqa1 _f8pj13af _9oik18uv _1bnxglyw _jf4cnqa1 _30l313af _1nrm18uv _c2waglyw _1iohnqa1 _9h8h12zz _10531ra0 _1ien1ra0 _n0fx1ra0 _1vhv17z1" href="http://klaviyo.com/careers" data-renderer-mark="true">klaviyo.com/careers</a> to see how we empower creators to own their own destiny.</em></p></div><h1>Position Title: Senior Software Engineer</h1> <p><strong>About the Team:</strong> Profile data is the bedrock upon which Klaviyo’s entire product ecosystem is built. The Profiles, Identity, and Consent teams tackle massive distributed systems challenges, operating at a breathtaking scale—storing tens of billions of records and processing billions of reads and writes every single day. We own the highly available platform that defines "who" a customer is and "how" they can be reached. By partnering with data warehousing, segmentation, and messaging teams, you will architect the foundational data pipelines that power Klaviyo’s core product capabilities worldwide.</p> <p><strong>Key Responsibilities:</strong></p> <ul> <li>Design and operate scalable distributed systems for identity resolution and consent</li> <li>Collaborate cross-functionally to translate requirements into robust technical designs</li> <li>Author technical design docs and service contracts for operational excellence</li> <li>Participate in on-call rotations to continuously improve system reliability</li> <li>Provide technical mentorship and conduct thoughtful code and design reviews</li> <li>Delegate implementation to AI agents by defining clear intent and rigorously verifying outputs for security and correctness</li> </ul> <p><strong>Required Skills:</strong></p> <ul> <li>7+ years of software engineering experience with strong computer science fundamentals</li> <li>Expertise in building backend service-oriented applications and REST/gRPC APIs</li> <li>Hands-on experience scaling distributed systems for performance and consistency.</li> <li>Proficiency with streaming and batch processing systems</li> <li>Production experience with relational database schema design and optimization</li> <li>Excellent communication skills for leading execution and driving team alignment</li> <li>BA/BS in Computer Science, a related field, or equivalent practical experience</li> <li>Expertise in agentic AI workflows to safely increase development throughput while preserving architectural coherence</li> </ul> <p><strong>Team Tech Stack:</strong></p> <ul> <li><strong>Languages:</strong> Python, SQL, Golang</li> <li><strong>Databases:</strong> Aurora MySQL, ProxySQL, Redis</li> <li><strong>Streaming and Batch:</strong> Apache Kafka, Pulsar, Spark, Iceberg</li> <li><strong>Infrastructure:</strong> AWS, Terraform, Docker, Kubernetes, Buildkite</li> </ul><br><p>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 <a href="https://getcovey.com/product/covey-scout-inbound">Covey Scout for Inbound</a> on April 3, 2025.</p><p>Please see the independent bias audit report covering our use of Covey <a href="https://getcovey.com/nyc-local-law-144" style="text-decoration:underline">here</a></p><div class="content-pay-transparency">< ... (truncated, view full listing at source)