Software Engineer Full Stack (Senior Staff+)

About Kustomer

Kustomer is the industry leading conversational CRM platform perfecting every customer experience. Built with intelligent tools such as AI and Automation no code-configuration and a connected data platform that unifies data from multiple sources through a single timeline Kustomer empowers businesses to operate with greater efficiency and deliver more personalized service to customers across any channel making every interaction more meaningful and memorable. Today Kustomer is the core platform for some of the leading customer service brands like Sweetgreen Starz Vuori Resy and Cotopaxi.

Kustomer was founded in 2015 by serial entrepreneurs Brad Birnbaum and Jeremy Suriel and has raised over $230M in funding backed by leading VCs. Meta announced its intention to acquire Kustomer in 2020 and completed the transaction in 2022. Kustomer joined Meta’s Business Messaging Group to transform the way people and businesses communicate through modern messaging channels.

In 2023 Kustomer spun out from Meta as a standalone company backed by original partners Battery Redpoint and Boldstart Ventures who have invested $60M. In 2025 Kustomer announced a $30M Series B led by Norwest with continued support from Battery Redpoint and boldstart. This milestone reflects strong conviction in our vision and fuels our next chapter of growth: expanding our AI-native platform accelerating product innovation and scaling our exceptional team.

Our Krew is made up of passionate and collaborative people who really care about what they do and the people they help. We look for people who are passionate about enhancing the customer service experience for everyone involved as it's the core of what we do. We're growing our business with no plans of slowing down. We actively seek individuals who want to learn and be challenged every day. We have also transitioned to a remote friendly company with Krew members located throughout the U.S. and U.K. coming together for Kamp Kustomer each year.

About the Role

We’re looking for a Full Stack Software Engineer to join our Product Engineering team. The Product Engineering team builds the core experiences that define how users interact with Kustomer. This is a hands-on role focused on delivering real impact through high-quality user-facing features. You will work across the stack shipping new capabilities improving performance and contributing to the evolution of our architecture using technologies like Node.js React Golang and AWS. You will be expected to take full ownership of your work and collaborate closely with teammates in engineering product and design.

AI is a core part of how we build. You'll use AI tools daily to move faster and raise the bar on what you ship. You'll also help build AI-powered product capabilities that meaningfully improve the customer experience.

We're looking for engineers with strong technical judgment a high bar for craft and real curiosity about how systems product and AI intersect. You take initiative thrive in ambiguous problem spaces and own your work end to end from design through production. Not because someone's tracking it but because you genuinely care about what you're building. If you want your work to directly shape the product and the team around you we'd love to hear from you.

What You’ll Do:

• Design develop and deploy robust and scalable full-stack web applications using Node.js React Golang MongoDB and AWS

• Collaborate with cross-functional teams including product managers designers and other engineers to understand project requirements and translate them into technical solutions.

• Build efficient and reusable backend and frontend components and libraries

• Develop APIs and integrate with external services and databases ensuring data integrity and security

• Write clean maintainable and well-documented code following best practices and coding standards

• Optimize application performance by implementing caching mechanisms efficient algorithms and database indexing

• Implement front-end interfaces with a focus on user experience responsiveness and accessibility

• Conduct thorough testing including unit testing and integration testing to ensure the quality and reliability of the application

• Collaborate with Infrastructure Engineers to deploy and maintain applications on AWS ensuring high availability and scalability

• Monitor and troubleshoot production issues providing timely resolutions and proactive bug fixes

• Stay up to date with the latest industry trends tools and technologies related to full-stack development and propose improvements to the development process

• Conduct code reviews provide constructive feedback and mentor junior developers to ensure code quality and continuous improvement

• Use AI tools to support day-to-day development including writing debugging testing and validating code

• Contribute to the design and implementation of AI-powered features where they enhance end-user experience or improve platform efficiency

• Stay current with emerging AI development tools and practices and help the team adopt those that improve velocity and quality

Your qualifications:

• 7+ years of progressive software development experience and a Bachelor's degree in Computer Science Software Engineering or a related field (or equivalent experience)

• Proficiency in one of the modern server-side languages such as JavaScript Go Python or Rust

• Experience in building web applications preferably using React.js and familiarity with front-end development principles including responsive design and cross-browser compatibility

• Deep understanding of software engineering principles design patterns and best practices for building scalable and maintainable code

• Experience with RESTful API development integrating with external services and databases

• Familiarity with cloud platforms such as AWS or GCP and experience with cloud services like AWS Lambda or Firebase

• Familiarity with version control systems such as Git and collaborative development workflows

• Ability to diagnose and debug complex issues optimize application performance and identify areas for improvement

• Experience using AI tools to support software development tasks such as code generation debugging testing or documentation

• Hands-on experience with modern AI developer tools such as GitHub Copilot Cursor Claude Code or similar

• Your application will stand out if you have:

  • Familiarity with integrating AI or ML-powered capabilities into web applications even at a prototype or feature level

  • Exposure to integrating third-party AI APIs or frameworks (e.g. OpenAI Anthropic LangChain or vector databases like Pinecone)

  • Interest in exploring how AI can enhance developer workflows and improve product functionality

  • Experience with testing frameworks and methodologies (e.g. Jest Playwright Cypress Mocha Selenium) and a focus on code quality through unit testing and integration testing

  • Strong Proficiency in AWS services such as EC2 S3 Lambda API Gateway and CloudFormation

  • Strong understanding of NoSQL databases particularly MongoDB including data modeling and query optimization

  • Familiarity with containerization technologies like Docker and container orchestration frameworks like Kubernetes

  • Familiarity with CI/CD pipelines and automation tools for building testing and deploying applications

  • Familiarity with authentication and authorization mechanisms (e.g. OAuth JWT)

  • Github activity showing thoughtful relevant contributions

• We encourage you to apply even if you don’t meet every requirement - experience comes in many forms and we value potential curiosity and diverse perspectives

HIPAA Compliance

All roles at Kustomer may involve handling sensitive personal data.

Benefits

Kustomer offers an array of benefits including competitive salaries and stock options. In the U.S. we offer 100% healthcare coverage 401K WiFi and Mobile reimbursement and a generous vacation policy; in the UK we also offer pension supplemental health insurance and other perks.

Diversity & Inclusion at Kustomer

Kustomer is committed to bringing together individuals from different backgrounds and perspectives.

We strive to create an inclusive environment where everyone can thrive feel a sense of belonging and do great work together.We are proud to be an equal opportunity employer open to all qualified applicants regardless of race color ancestry religion sex national origin sexual orientation age citizenship marital status disability gender identity or expression Veteran status or any other legally protected status.

Disclaimer: Kustomer only contacts candidates from company email addresses ending in kustomer.com and does not seek funds from candidates in any circumstances.

What We Do

Kustomer’s AI-native CX Platform defines the next era of CX with humans and AI working together seamlessly through visibility orchestration and action.

Why Work With Us

Brands like Sweetgreen Starz Vuori Resy and Cotopaxi trust Kustomer's exceptional CRM. The Kustomer Krew is dedicated to perfecting the customer experience and we’re looking for people. who are passionate about finding a better way to do what’s always been done. You'll work alongside seasoned entrepreneurs and leaders in building our future.

Gallery