Senior Software Engineer Devx
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Job Location:
Boston, NH - USA
Monthly Salary:
Not Disclosed
Posted on:
7 hours ago
Vacancies:
1 Vacancy
Job Summary
Klaviyo is growing fast and we have openings for all skill levels across all of our teams. Learn more about our engineering culture at
We love tackling tough engineering problems and look for Engineers who specialize in certain areas but are passionate about building owning & scaling features end to end from scratch and breaking through any obstacle or technical challenge in their way. We push each other to move out of our comfort zone learn new technologies and work hard to ensure each day is better than the last.
Klaviyo operates a real-time data platform coded in Python built for massive scale on Amazon Web Services (AWS). Engineers come to Klaviyo with experience in a variety of languages and from a number of disciplines.
Team Overview:
DevX is a hybrid productplatform team focused on empowering external developers and partners by supporting applications they build on top of Klaviyos Public APIs and features. Examples of these areas of ownership include:
- our Application directory which is used to promote and allow Klaviyo customers to discover applications that they can enable for their account
- the self-serve application process for a Partner to submit an Application and the ability for Klaviyo staff to review and approve an Application
- API Analytics is a system used by developers and partners to diagnose issues in their applications and understand their API usage. It is powered by a near realtime data pipeline that processes over 160000 events per second.
- Autogenerated API docs SDKs CLIs & MCP servers
Responsibilities:
You will have an opportunity to make a major impact on the direction and priorities of the team.
As an engineer on this team you will work on Klaviyos app marketplace application publishing workflows and the developer-facing tools and systems that support our app ecosystem. Additional responsibilities include providing quality PR reviews for our code-owned areas of the application collaborating with product owners and providing technical expertise on upcoming Product Specifications and participating in the definition of well-defined estimated and planned scopes of work.
Required Skills:
- 5 years of experience in a software engineering discipline
- Experience with full stack application development
- Experience working with both monolithic and microservices architectures
- Experience with CI/CD pipelines
- Experience debugging performance issues and improving application performance
Team Tech Stack:
- Python
- Django REST Framework Django fastAPI
- React React Query
- MySQL / postgreSQL
- DocumentDB
- Clickhouse
- JSON Forms
- Redis
- Memcached
- RabbitMQ / Celery / Apache Pulsar
Preferred Skills:
- Experience working with Service Oriented Architecture (preferably in Python)
- Experience working with RESTful applications/APIs/gRPC
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
Required Experience:
Senior IC
Key Skills
- Spring
- .NET
- C/C++
- Go
- React
- OOP
- C#
- AWS
- Data Structures
- Software Development
- Java
- Distributed Systems
About Company
Klaviyo unifies AI-powered email marketing and SMS to drive growth, retention, and measurable results. Build personalized, omnichannel experiences across WhatsApp, ecommerce, and more with K:AI Agents.
