Senior Software Engineer - Infrastructure Security

United States Digital Space LLC; Boston (MA); On-site; USD 130,000 - 180,000; Full time

Job summary

Klaviyos in Boston, MA is seeking a Senior Software Engineer for the Infrastructure Security team. You will design, build, and operate cloud-native security services that help our engineers ship secure software at high speed.

You will own components end-to-end and collaborate with senior engineers on system design and production readiness. The role emphasizes reliability, observability, and security, with a stack including Python, Go, AWS, Kubernetes, and Terraform.

Qualifications

• 6+ years of solid experience building and operating cloud-native, distributed systems in production.
• Proficient in production-quality code with Python or Go.
• Hands-on experience with cloud providers (AWS) and managing services, networking, IAM.

Responsibilities

• Design, build, and maintain cloud-native security services used across the company.
• Own meaningful components end to end, from implementation through production operation.
• Improve availability, latency, scalability, and efficiency of infrastructure security systems.
• Collaborate with senior engineers on system design and architecture; contribute ideas and technical solutions.
• Identify performance, reliability, and security issues in distributed systems and drive improvements.
• Build tooling, automation, and documentation to improve developer experience and security posture.
• Participate in on-call rotation with focus on learning, prevention, and reducing operational toil.

Skills

Cloud-native systems

Python/Go

AWS experience

Kubernetes

Terraform

Communication

Tools

AWS

Terraform

Kubernetes

Job description

*At the company, we value the unique backgrounds, experiences and perspectives each the company (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 the company? Visit the company.com/careersto see how we empower creators to own their own destiny.*

Team Overview

The Infrastructure Security team makes it simple and easy for engineers to make secure choices while developing world‑class software at high speed. Security is built in by default—seamless and effortless—making engineers’ lives better and the company more secure.

Our work sits at the intersection of security, infrastructure, and software engineering. We build cloud-native platforms and services that are reliable, secure, and performant at global scale, forming the foundation that the company engineers rely on every day.

This role is for engineers who enjoy building modern distributed systems, care about security and reliability, and want to have real impact across a large engineering organization.

How you’ll make an impact

As a Senior Software Engineer on the Infrastructure Security team, you will build and operate the systems that help the company engineers ship secure software with confidence. You will:

• Design, build, and maintain cloud-native security services used across the company

• Own meaningful components and services end to end, from implementation through production operation

• Improve the availability, scalability, latency, and efficiency of infrastructure security systems

• Collaborate with senior engineers on system design and architecture, contributing ideas and technical solutions

• Identify performance, reliability, and security issues in distributed systems and drive improvements

• Work extensively with technologies such as Python, Golang, AWS, Kubernetes, Terraform, and modern data stores

• Participate actively in design reviews, code reviews, and whiteboarding sessions

• Contribute to operational excellence through monitoring, alerting, and incident response

• Participate in an on‑call rotation with a focus on learning, prevention, and reducing operational toil

• Build tooling, automation, and documentation that improve developer experience and security posture

• Partner with product‑facing and platform engineers to ship impactful, secure solutions

Who you are

• You have 6+ years of solid experience building and operating cloud-native, distributed systems in production

• You are comfortable writing production‑quality code in a language such as Python or Go

• You have hands‑on experience with AWS (or a similar cloud provider) and understand managed services, networking, and IAM concepts

• You have experience working with containers and orchestration platforms such as Kubernetes

• You have experience writing infrastructure as code using languages such as Terraform

• You are comfortable owning services and features independently, while knowing when to ask for feedback or support

• You understand the fundamentals of scalable, multi‑tenant architectures and secure system design

• You care about reliability, performance, observability, and security—not just shipping features

• You are comfortable participating in on‑call and responding to production issues

• You are an excellent communicator and collaborator. You lead technical discussions at the project and product‑area level, write clear technical design documents and RFCs, and keep stakeholders aligned on progress, risks, and trade‑offs.

• Ability to handle yourself and complex systems in outage situations and to drive failures to root cause analysis and prevention of future issues.

• You’ve already experimented with AI in work or personal projects, and you’re excited to dive in and learn fast. You’re hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient.

• You question convention and proactively look for ways to improve, whether that’s workflows, architecture, tooling, or team processes. You are intrinsically motivated to drive incremental and step‑change improvements that deliver value to the business.

• You mentor and support other engineers, offering thoughtful feedback in design and code reviews, helping refine specifications, and investing in the growth of more junior engineers on the team.

• You enjoy working on small, autonomous, agile teams, shipping early and often, pairing with product managers, business stakeholders, and other engineers to craft better software.

Nice to have

• Experience building security tooling, working with security infrastructure systems like Vault, AWS IAM, WAFs, and more

• Experience with service meshes, API gateways, or zero‑trust architectures

• Experience improving performance in distributed systems or debugging complex multi‑service workflows

Tech Stack

the company’s platform is primarily built with Python and React and runs on AWS. Engineers join us from a wide range of technical backgrounds and are supported in learning our stack. Core technologies include:

• Python / Django / Golang / FastAPI

• MySQL / Redis / Memcached

• RabbitMQ / Celery / Apache Kafka / Apache Pulsar

• AWS / Terraform / Kubernetes

Location & Work Model

This role is based in Boston, Massachusetts. the company supports work authorization and relocation for this position.

At the company, we enjoy tackling meaningful engineering challenges and value people who take ownership, learn continuously, and collaborate openly. We are committed to building inclusive teams and encourage applications from candidates of all backgrounds.

the company is growing fast and we have openings for all skill levels across all of our teams. Learn more about our engineering culture at https://the company.tech

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

**Massachusetts Applicants:**It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Our salary ran