Senior Software Engineer - Frontend

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 careers.klaviyo.com to see how we empower creators to own their own destiny.
Candidates must be willing to work out of our Boston office 3x/week.Why You Should Join our Customer Facing Feature Teams
Engineers on these teams have a unique opportunity to build experiences that are interacted with by millions of people every day. We work on a wide variety of projects including enhancements to existing products as well as greenfield projects. We're a team that values ownership, iterates quickly, learns from and challenges each other to develop the best experiences for our customers.
How You Will Make a Difference:

• Take ownership of feature development, ensuring timely delivery, alignment with product requirements, successful deployment, and monitoring.
• Collaborate with Product, Design, and Data Science to deliver user-friendly and visually appealing interfaces.
• Participate in code reviews, providing constructive feedback and ensuring code quality.
• Mentor more junior team members and help foster a collaborative and inclusive team environment.
• Proactively propose and implement improvements to the codebase and development processes.

Must haves

• 5+ years of professional experience as a Fullstack engineer, with a strong emphasis on frontend development.
• Expert-level proficiency in HTML, CSS, and Javascript.
• Expert-level proficiency in React and Typescript.
• Familiarity with testing frameworks and methodologies (e.g., Jest, Cypress).
• Familiarity with RESTful APIs and modern backend technologies.
• Familiarity with relational databases.
• Experience working on customer-centric and product-driven teams.
• Experience working in a cross team capacity with multiple stakeholders. Strong communication is a must.
• Comfortable in a fast-paced environment with rapid iterations.

Nice to haves

• Experience with Python.
• Understanding of CI/CD pipelines and DevOps practices.
• Experience with cloud platforms (e.g., AWS, Azure, GCP)

Technologies we use (not exhaustive):

• TypeScript, React, HTML, JavaScript, Webpack
• Python, Django, Celery
• MySQL, Cassandra, RabbitMQ, Redis
• Amazon Web Services (EC2, RDS, Aurora, etc.), Terraform, and other DevOps tools

The pay range for this role is listed below. Sales roles are also eligible for variable compensation and hourly non-exempt roles are eligible for overtime in accordance with applicable law. This role is eligible for benefits, including: medical, dental and vision coverage, health savings accounts, flexible spending accounts, 401(k), flexible paid time off and company-paid holidays and a culture of learning that includes a learning allowance and access to a professional coaching service for all employees.
Base Pay Range For US Locations:
$152,000 - $228,000 USD
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.
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.