Software Engineer II - Flows Platform
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.
What this role actually needs.
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. Responsibilities: - Core Execution Engine: The logic for flow triggering, evaluation (filtering/branching), and action execution. We ensure that every event is processed accurately and efficiently. - Scheduling & Orchestration: Managing time-based logic, delays, and the dispatching of millions of scheduled actions per day. - High-Scale Infrastructure: Owning the execution data stores and pipelines that must run reliably at huge scale. Requirements: - 3+ years of experience in a software engineering role with a focus on backend systems and high-volume data processing. - Strong Backend proficiency: Deep experience building robust services and APIs using Python and Django (or similar frameworks). - Distributed Systems knowledge and experience working with asynchronous task queues (e.g. Celery, RabbitMQ, Pulsar) and understanding the challenges of eventual consistency and distributed state. - Proficiency with relational databases (MySQL/Aurora) and high-scale NoSQL stores (Redis, or DynamoDB). - A focus on writing clean, maintainable code, participating in code reviews, and leading robust testing practices (unit, integration, and load testing). - Experience working in fast-paced environments and collaborating with other engineering teams to solve cross-functional problems. Company context: Klaviyo is the public marketing automation and CDP company powering email, SMS, and AI personalization for ecommerce.
Day-to-day expectations
Klaviyo lists these responsibilities for the Software Engineer II - Flows Platform role.
- Core Execution Engine: The logic for flow triggering, evaluation (filtering/branching), and action execution. We ensure that every event is processed accurately and efficiently.
- Scheduling & Orchestration: Managing time-based logic, delays, and the dispatching of millions of scheduled actions per day.
- High-Scale Infrastructure: Owning the execution data stores and pipelines that must run reliably at huge scale.
What a strong candidate brings
These requirements are extracted from the source listing and normalized for UpJobz readers.
- 3+ years of experience in a software engineering role with a focus on backend systems and high-volume data processing.
- Strong Backend proficiency: Deep experience building robust services and APIs using Python and Django (or similar frameworks).
- Distributed Systems knowledge and experience working with asynchronous task queues (e.g. Celery, RabbitMQ, Pulsar) and understanding the challenges of eventual consistency and distributed state.
- Proficiency with relational databases (MySQL/Aurora) and high-scale NoSQL stores (Redis, or DynamoDB).
- A focus on writing clean, maintainable code, participating in code reviews, and leading robust testing practices (unit, integration, and load testing).
- Experience working in fast-paced environments and collaborating with other engineering teams to solve cross-functional problems.
Why this listing is more than a copied job post.
Software Engineer II - Flows Platform is framed against UpJobz source checks, country scope, compensation visibility, and work-authorization signals so candidates can make a faster go/no-go decision.
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On-site roles in Boston should be compared against commute, local salary bands, and nearby employer demand.
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- Tailor your resume around ai and python instead of sending a generic application.
- Use the first two bullets of your application to connect your background directly to software engineer ii - flows platform is a high-signal on-site role in boston, and it is most realistic for open to tn, h-1b, and opt candidates already in the united states.
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- Compensation is hidden, so get range clarity in the first recruiter conversation.
- Use open to tn, h-1b, and opt candidates already in the united states as part of your positioning so the recruiter does not have to infer it.
- Show concrete examples of succeeding in on-site environments.
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Apply through the employer source
Open the source listing from klaviyo.com, confirm the role is still active, then apply on the employer or ATS page.
Source: klaviyo.com · Source ID: 7651386003 · Confidence: 88/100 · Last checked: May 7, 2026
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