Senior Software Engineer (multiple)

Klaviyo GMI • Boston, MA

2d • Hybrid

About The Position

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. Design, implement, and scale highly visible mission critical data processing systems. Improve systems from every angle, including latency reduction, resource utilization efficiency, failure recovery, tooling, and monitoring. Simplify the use of these systems so other teams can use them as services. Wholly own features that thousands of our customers rely on a daily to reach billions of consumers to drive the business forward. Craft highly scalable inbound and outbound data pipelines that process billions of data points daily. Work with other teams and enable engineers to build customer-facing software more effectively. Own a significant portion of our product area, identify and advocate for necessary improvements, and help reduce long-term operational overhead. Responsible for end-to-end implementation of projects of varying complexity. Telecommuting permitted 2-3 days per week. Multiple positions. Full-time. EEO/fully supports affirmative action practices. To apply, visit https://careers.klaviyo.com/en/ & search Job Title. 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 Get to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. You can find our Job Applicant Privacy Notice here . By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here.

Requirements

• Bachelor's degree in Computer Science, Information Technology, Information Systems, or a related field of study and seven (7) years of experience in job offered, or as Software Developer, Software Engineer, R&D Software Engineer, System Engineer, or related occupation.
• Alternatively, a master's degree in an acceptable field of study and five (5) years of acceptable experience.

Responsibilities

• Design, implement, and scale highly visible mission critical data processing systems.
• Improve systems from every angle, including latency reduction, resource utilization efficiency, failure recovery, tooling, and monitoring.
• Simplify the use of these systems so other teams can use them as services.
• Wholly own features that thousands of our customers rely on a daily to reach billions of consumers to drive the business forward.
• Craft highly scalable inbound and outbound data pipelines that process billions of data points daily.
• Work with other teams and enable engineers to build customer-facing software more effectively.
• Own a significant portion of our product area, identify and advocate for necessary improvements, and help reduce long-term operational overhead.
• Responsible for end-to-end implementation of projects of varying complexity.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 1,001-5,000 employees