Software Engineer, Klaviyo
Integrations Velocity, Fullstack - Frontend
$120-180k
3+ days a week in office
The only CRM built for B2C
Open for applications
The only CRM built for B2C
1001+ employees
Open for applications
$120-180k
3+ days a week in office
1001+ employees
Company mission
Klaviyo is the only CRM built for B2C brands. Powered by its built-in data platform and AI insights, Klaviyo combines marketing automation, analytics, and customer service into one unified solution, making it easy for businesses to know their customers and grow faster.
Role
Who you are
- 4+ years of experience in a software engineering role with a strong focus on frontend development
- Strong proficiency in React 16+, Javascript/Typescript, HTML, and CSS
- Strong experience building feature-rich, easy-to-use front-end user experiences for high volume web applications
- Experience writing backend services in Python (or similar languages)
- Familiarity with building full stack applications or working closely across frontend/backend boundaries
- Strong testing, debugging, and documentation practices
- Interest in building tools that empower other developers
Desirable
- Experience with ETL systems or integration frameworks
- Background in building internal platforms or developer tooling
- Experience in cloud-native environments (especially AWS)
- Exposure to data syncing, APIs, or workflow automation
What the job involves
- As a Software Engineer II on this team, you’ll work across the stack—but with a strong focus on frontend development
- You’ll help design and build intuitive React-based tools and UIs that streamline the development experience for anyone working with IGF
- From debugging and deployment to monitoring and configuration, your work will directly improve how fast and efficiently new integrations are delivered
- You’ll also collaborate on our Python backend, contributing to the continued evolution of IGF and the infrastructure that powers it
- Whether you're writing reusable components, improving observability, or building documentation workflows, your contributions will help accelerate Klaviyo’s ability to enter new markets and scale developer impact
- Build React applications and components that improve the integration development experience (debugging tools, visual monitoring, etc.)
- Collaborate on IGF’s Python-based backend, contributing to core ETL workflows and developer APIs
- Help define the user experience for internal and external developers working with integrations
- Own your projects end-to-end, writing well-tested, maintainable code and participating in technical design
- Partner closely with Product, Design, and other engineers to ship impactful features that scale
Our take
Klaviyo is a marketing firm helping growth-focused eCommerce brands drive more sales with super-targeted, highly relevant email, Facebook and Instagram marketing campaigns. From personalised newsletters to automated emails when customers abandon their shopping carts, the marketing automation platform makes it easy for businesses to capture, store, analyze, and predictively use their own data to drive measurable, high-value outcomes.
Klaviyo's CEO, Bialecki, believes that the main problem with e-mail marketing today is that there is a divide between two kinds of tools: analytics tools that help you understand what people are doing on a website, such as what products they are considering, and messaging tools that send them a marketing e-mail. Operating primarily within the retail and eCommerce industry, Klaviyo aims to solve this by offering a tool that brings together analytics and messaging. This allows companies to bring all of their first-party data into a single platform to get a deep understanding of their customers and then activate that data to deliver highly-targeted, personalised communications through email and SMS. In the process, Klaviyo's customers get a deep understanding of their consumers.
Klaviyo is a fast-growing company mainly due to its business model - the firm offers a concrete ROI for Klaviyo’s clients if the software persuades customers to make purchases by treating different types of customers differently. An IPO in 2023 has led to Klaviyo's release of Klaviyo AI, which empowers businesses to unlock revenue-driving opportunities and deliver exceptional customer experiences across channels. Still in its early days of public listing, it will be interesting to see how Klaviyo fares in the years to come.
Freddie
Company Specialist at Welcome to the Jungle
Meet the team
2 people
Meet Blake, Manager of New Hire Onboarding
Our mission
Base Camp provides a best in class onboarding program, fueled by 'just in time' learning throughout a new hires' first 100 days.Insights
Company
Employee endorsements
Opportunities to learn
"Not only we have a good stipend to spend on learning but we also have development days every quarter, where we can switch off and focus on the areas..."
Company benefits
- Private health care cover
- All full time employees receive equity
- Commuting allowance for when you do travel to the office,
- A very generous education allowance every year for you to spend on learning and development.
- Participation in Klaviyo ESPP
- Personal lifestyle allowance
- Flexible holiday scheme
Company values
- Put customers first.
- Win together.
- We’re 1% done.
- Know the score.
- Be meticulous in your craft.
- Move fast, no shortcuts.
- Drivers wanted.
- Stay hungry, stay humble.
Company HQ
Financial District, Boston, MA
Articles
Leadership
Andrew Bialecki
(CEO)Previously CTO at RockTech, Senior Engineer at Performable, Lead Engineer at Applied Predictive Technologies and an SDET Intern at Microsoft
Ed Hallen
(Chief Product Officer)Currently an Advisor at Team Engine. Previously worked in Enterprise Business Development at Google, Summer Associate at Accel-KKR and Principal at Applied Predictive Technologies.
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