Senior Software Engineer at Klaviyo | Boston, MA

Join Klaviyo as a Senior Software Engineer and be a part of a dynamic team that drives innovation and delivers exceptional solutions. In this pivotal role, you will design, develop, and maintain scalable software applications that empower businesses to connect with their customers effectively.The ideal candidate will have a proven track record in software engineering, strong problem-solving skills, and a deep understanding of modern programming languages and frameworks. If you are passionate about technology and eager to make a significant impact, we want to hear from you!

At Klaviyo, we celebrate the diverse backgrounds, experiences, and perspectives that each Klaviyo (as we refer to ourselves) contributes to our workplace daily. We firmly believe that everyone deserves an equal opportunity for success and value the unique experiences each individual brings beyond traditional job qualifications. If you find yourself closely aligned with our job description but not a perfect match, we encourage you to apply. Curious about life at Klaviyo? Discover how we empower creators to take charge of their own journey by visiting klaviyo.com/careers .Klaviyo is rapidly expanding, and we are seeking talented individuals at all skill levels to join our diverse teams. To learn more about our engineering culture, visit https://klaviyo.tech. We thrive on solving complex engineering challenges and seek Engineers who not only specialize in specific areas but are also enthusiastic about building, owning, and scaling features from the ground up while overcoming any obstacles or technical hurdles that arise. We inspire one another to step outside our comfort zones, learn new technologies, and continuously improve our day-to-day experiences. Klaviyo operates a high-performance real-time data platform designed for massive scalability on Amazon Web Services (AWS). Our Engineers come with diverse backgrounds and expertise across various programming languages and disciplines.ResponsibilitiesAs part of the Data Platform team, you will engage with large-scale distributed systems and databases to drive essential Klaviyo functionalities and generate insightful, data-driven conclusions. Your role will involve designing, building, and maintaining systems that support various engineering teams at Klaviyo. Collaborating with a cross-functional team, you will contribute to system design, write high-quality code, create infrastructure, and manage large-scale systems in a production environment.Team Tech StackAWSPythonKubernetesMySQLClickhouseKafkaSparkFlinkIcebergTerraformAirflow

Join Klaviyo as a Software Engineer II specializing in WhatsApp functionalities. In this role, you'll leverage your programming expertise to design, develop, and maintain innovative software solutions that enhance user experience on the WhatsApp platform. Collaborate with cross-functional teams to identify challenges and implement effective solutions in a dynamic tech environment.

Join Klaviyo as an AI Engineer II and become a vital part of our innovative team. In this role, you will leverage your expertise in artificial intelligence to develop cutting-edge solutions that enhance our marketing automation platform. Collaborate with cross-functional teams to implement machine learning algorithms and data-driven strategies that drive customer engagement.

Join Klaviyo as a Software Engineer II specializing in Identity & Access Management within our Core Infrastructure team. In this role, you will contribute to the development of cutting-edge solutions that enhance our security and user management capabilities, ensuring a seamless experience for our customers. Collaborate with cross-functional teams to design, implement, and optimize identity management solutions that align with Klaviyo’s mission of empowering businesses through data-driven insights.

Role overview The Product Expert role at Klaviyo focuses on helping customers in Boston, MA use the Klaviyo platform to improve their marketing strategies. This position involves close collaboration with teams across the company to ensure the product continues to meet user needs and provide meaningful value. What you will do Guide customers as they navigate Klaviyo’s tools to enhance their marketing efforts Collaborate with cross-functional teams to ensure the product reflects customer feedback and requirements Support businesses in using their data more effectively to drive engagement and growth Offer tailored solutions that help customers maximize the value of the Klaviyo platform Location This role is based in Boston, MA.

Join Klaviyo as a Senior Software Engineer focused on Growth, where you'll play a pivotal role in enhancing our platform's capabilities. You will work closely with cross-functional teams to design, develop, and implement innovative solutions that drive user engagement and expand our customer base. This is an exciting opportunity to leverage your technical expertise in a dynamic environment.

Klaviyo is looking for a Senior Software Engineer focused on Developer Infrastructure to help improve the way engineers build and ship software. This position is based in Boston, MA. Role overview This role centers on building and maintaining tools and platforms that make development smoother and more efficient. The work supports the entire engineering team, helping to remove obstacles and simplify daily workflows. What you will do Create and refine internal tools that streamline development processes Work closely with teams across the company to understand their challenges Implement solutions that improve productivity and foster a better developer experience Collaboration Expect to partner with engineers, product managers, and other stakeholders to identify pain points and deliver improvements that benefit the whole organization.

Join Klaviyo as a Senior Software Engineer specializing in Channel Processing, where you will play a pivotal role in enhancing our data processing capabilities. In this position, you will work closely with cross-functional teams to design, develop, and implement robust software solutions that improve our channel processing infrastructure. This is an exciting opportunity to contribute to a rapidly growing company dedicated to empowering businesses through innovative technology.

Join Klaviyo as a Senior Lead Software Engineer specializing in Messaging Infrastructure. In this pivotal role, you will spearhead our messaging systems, ensuring they are scalable, reliable, and efficient. You will work closely with cross-functional teams to design and implement new features that enhance user experience and drive engagement. Your expertise will help shape the future of our communication platforms.

Join our dynamic team at Klaviyo as a Software Engineer II specializing in Groups. You will collaborate with talented engineers and product teams to develop scalable solutions that enhance user experiences and drive growth. Your expertise in software development will be crucial in designing, implementing, and maintaining innovative systems that empower our clients.

Role Overview Klaviyo is hiring a Software Engineer II focused on Analytics Data Engineering in Boston, MA. This position centers on building and maintaining data systems that support analytics across the company. What You Will Do Work with teams from different disciplines to design and implement data pipelines. Create scalable solutions that help drive data-informed decisions throughout Klaviyo. Use modern technologies to support analytics initiatives and improve data infrastructure.

At Klaviyo, we celebrate the diverse backgrounds, experiences, and viewpoints that our team members—whom we affectionately call Klaviyos—bring to our workplace daily. We believe everyone deserves an equitable chance at success and value the unique experiences each individual offers beyond conventional job qualifications. If you feel you are a close match for this role, we encourage you to apply. To learn more about life at Klaviyo, visit klaviyo.com/careers to discover how we empower creators to take charge of their own destinies.Why You Should Join the Onboarding TeamThe Product Expansion team at Klaviyo is dedicated to enhancing the initial experience of our platform for new users. We are committed to optimizing the setup process for customers, ensuring they quickly realize the value of our tools. As engineers, we leverage data to identify improvement opportunities, conduct A/B tests to validate our hypotheses, and collaborate across departments to continually enhance user experience while minimizing obstacles for newcomers. We seek versatile software engineers who are enthusiastic about refining user experiences and have an interest or experience in expanding a user base through effective onboarding strategies.How You Will Make a DifferenceImplement user-experience enhancements throughout the Klaviyo product, with a focus on the new customer journey.Design and execute A/B tests to validate concepts, analyzing results to guide product improvements.Collaborate with marketing, data science, sales, and engineering teams to identify enhancement opportunities and engage directly with customers to understand their needs better.Contribute to refining our experimentation and development methodologies while mentoring fellow engineers.Clearly define objectives, constraints, and context for AI implementations, ensuring accuracy with a focus on security, performance, and maintainability.

At Klaviyo, we celebrate the diverse backgrounds, experiences, and perspectives that our team members, whom we affectionately call Klaviyos, contribute to our vibrant workplace. We believe in providing everyone with an equal opportunity for success and value the unique experiences that go beyond conventional job expectations. If you feel you are a close match for this role, we encourage you to apply. To discover more about life at Klaviyo, visit klaviyo.com/careers and learn how we empower creators to take charge of their own futures.About the TeamThe Klaviyo Billing & Monetization team is far from the traditional billing department you might envision. We manage the payments and enforcement infrastructure that enables hundreds of thousands of businesses to send billions of emails and texts, especially during peak periods like Black Friday Cyber Monday. Our team is tasked with tracking product usage for billing purposes, managing customer subscriptions and payments, and strategizing pricing for both new and existing products. As Klaviyo continues to grow, our team will be pivotal in capturing revenue across domestic and international markets, developing features that enhance user understanding of their spending, ensuring compliance with regulations, facilitating internationalization, and implementing all pricing-related changes at Klaviyo.About the RoleWe are looking for a Software Engineer II to join our Billing & Monetization team and help propel Klaviyo's mission to provide entrepreneurs with top-notch tools at unbeatable prices. In this role, you will influence key decisions that impact Klaviyo’s expansion into international markets, manage relationships with large clients that have unique payment needs, and shape how new products are priced and packaged.Your ImpactLead the development of customer-facing products that enhance transparency in billing.Innovate methods to accurately and reliably track billions of product usage events.Collaborate with Klaviyo customers and stakeholders to create a platform that maximizes value for users and Klaviyo alike.Contribute to building robust features that clarify billing processes and pricing strategies.

Join Klaviyo as a Software Engineer specializing in Core Reporting. In this role, you will be pivotal in developing robust reporting solutions that empower our clients to make data-driven decisions. Your expertise will help enhance our analytics platform, ensuring it meets the evolving needs of our users.

Join Klaviyo as a Lead Software Engineer specializing in Mobile Channels, where you will spearhead innovative mobile solutions that enhance user experience and drive engagement. You will collaborate with cross-functional teams to design, develop, and implement cutting-edge applications that meet our users' needs.Your leadership will guide the engineering team in best practices, fostering a culture of creativity and technical excellence. If you're passionate about mobile technology and eager to make a significant impact on our products, we want to hear from you!

Join Xometry as a Senior Software Engineer, where you will play a pivotal role in developing innovative software solutions that drive our business forward. You will collaborate with talented engineers to create applications that enhance our platform’s functionality and user experience.

Join Klaviyo as a Software Engineer II on our Flows Platform team! As a key contributor, you will help design and implement scalable solutions that enhance the user experience and streamline workflows. This is an exciting opportunity to be part of a dynamic team that values innovation and collaboration.

Join our innovative Social Team as a Software Engineer II at Klaviyo, where you'll play a pivotal role in enhancing our platform's capabilities. We are looking for a passionate individual who thrives in a collaborative environment and is eager to tackle complex challenges in software development. You will work closely with cross-functional teams to design, implement, and improve features that impact our users directly.

Role overview Klaviyo is hiring a Software Engineer II focused on Developer Experience in Boston, MA. This role centers on improving the tools and systems that support developers across the company. The goal: make it easier for engineers to build and ship strong products. What you will do Work with teams from different disciplines to refine and enhance developer workflows Contribute to the design and delivery of software solutions that raise the bar for developer productivity Help maintain and evolve internal tools and systems to support a smooth engineering experience