Software Engineer, Full Stack

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 plays an important role in how we build. You should be comfortable using AI tools to accelerate development, validate your work, and improve overall code quality. You will also contribute to AI-powered product features where they can meaningfully improve the end-user experience.

What We're Seeking

We seek engineers who combine technical excellence with genuine passion for their craft. Our ideal candidate is someone who approaches challenges with curiosity and intrinsic motivation; working on problems not just because they're assigned, but because they find the work genuinely engaging and meaningful.

You should be someone who is naturally detail-oriented, professional, and brings a structured approach to your work while remaining open-minded and adaptable to new technologies and methodologies. We value candidates who work hard and maintain high personal standards, driven by ambition to grow both technically and professionally.

Most importantly, we're looking for engineers who are passionate about the technology space we operate in, particularly AI and automation. You should be excited about the problems we're solving and eager to contribute to innovative solutions that push the boundaries of what's possible.

If you're someone who takes ownership of your work, approaches challenges with intellectual curiosity, and thrives in environments where your passion for technology can directly impact product development, 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:

• 5+ 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.