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.