Senior Software Engineer - Devx

<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><p>Klaviyo is growing fast and we have openings for all skill levels across all of our teams. Learn more about our engineering culture at <a href="https://klaviyo.tech/">https://klaviyo.tech</a></p> <p>We love tackling tough engineering problems and look for Engineers who specialize in certain areas but are passionate about building, owning scaling features end to end from scratch and breaking through any obstacle or technical challenge in their way. We push each other to move out of our comfort zone, learn new technologies and work hard to ensure each day is better than the last.</p> <p>Klaviyo operates a real-time data platform coded in Python built for massive scale on Amazon Web Services (AWS). Engineers come to Klaviyo with experience in a variety of languages and from a number of disciplines.</p> <p><strong>Team Overview: </strong></p> <p>DevX is a hybrid product–platform team focused on empowering external developers and partners by supporting applications they build on top of Klaviyo’s Public APIs and features. Examples of these areas of ownership include:</p> <ul> <li>our Application directory, which is used to promote and allow Klaviyo customers to discover applications that they can enable for their account</li> <li>the self-serve application process for a Partner to submit an Application and the ability for Klaviyo staff to review and approve an Application</li> <li>API Analytics is a system used by developers and partners to diagnose issues in their applications and understand their API usage. It is powered by a near real–time data pipeline that processes over 160,000 events per second.</li> <li>Autogenerated API docs, SDKs, CLIs MCP servers</li> </ul> <p><strong>Responsibilities:</strong></p> <p><em>You will have an opportunity to make a major impact on the direction and priorities of the team.</em></p> <p><em>As an engineer on this team, you will work on Klaviyo’s app marketplace, application publishing workflows, and the developer-facing tools and systems that support our app ecosystem. Additional responsibilities include providing quality PR reviews for our code-owned areas of the application, collaborating with product owners and providing technical expertise on upcoming Product Specifications, and participating in the definition of well-defined, estimated, and planned scopes of work.</em></p> <p><strong>Required Skills: </strong></p> <ul> <li><em>5+ years of experience in a software engineering discipline</em></li> <li><em>Experience with full stack application development</em></li> <li><em>Experience working with both monolithic and microservices architectures</em></li> <li><em>Experience with CI/CD pipelines</em></li> <li><em>Experience debugging performance issues and improving application performance</em></li> </ul> <p><strong>Team Tech Stack:</strong></p> <ul> <li>Python</li> <li>Django REST Framework, Django, fastAPI</li> <li>React, React Query</li> <li>MySQL / postgreSQL</li> <li>DocumentDB</li> <li>Clickhouse</li> <li>JSON Forms</li> <li>Redis</li> ... (truncated, view full listing at source)