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

Kustomer is hiring a Full Stack Software Engineer to join our Engineering team. In this role, you'll work as part of a Pod: a 3–5 person team that picks up a high-priority initiative, ramps quickly, ships end-to-end, and moves on to the next one. You'll be a capable, adaptable engineer who can walk into any part of the codebase, understand it, and make it better. You'll ship new capabilities, improve performance, and contribute to the evolution of our architecture using technologies like Node.js, React, Golang, and AWS, collaborating closely with your squad leader and teammates across 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:

• Ship full-stack features end-to-end as a member of a Pod, owning scope from problem definition through production, using technologies like Node.js, React, Golang, MongoDB, ElasticSearch, and AWS

• Develop APIs and integrate with external services and databases, with real accountability for data integrity and security

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

• Design and implement AI-powered features where they meaningfully enhance the end-user experience or improve platform efficiency

• Collaborate with product managers and other engineers, and actively shape design and UX decisions rather than just implementing requirements handed to you

• Contribute to scope and tradeoff decisions alongside your Pod Lead; own what's in scope, escalate what isn't, and communicate progress proactively

• Optimize application performance through caching, efficient algorithms, and database indexing

• Write thorough unit and integration tests as a standard part of how you build

• Participate in code reviews, give feedback that helps others grow, and start building the muscle of mentoring more junior engineers

• Share production support responsibility on a rotating basis, including on-call and bug triage

• Stay current with emerging AI tools and full-stack technologies, and start proposing and championing the ones that will actually move the team forward

• Ramp quickly on unfamiliar parts of the codebase, using AI tooling and your own growing engineering instincts to get there faster

Your qualifications:

• 3+ years of professional software development experience, with a Bachelor's degree in Computer Science, Software Engineering, or a related field (or equivalent experience)

• Comfort working across frontend and backend. You likely have a stronger side by now, and that's fine. What matters is that you're not blocked by an unfamiliar layer.

• A working understanding of how systems operate at depth, including experience with cloud platforms like AWS or similar, and real working knowledge of data structures, algorithms, concurrency, distributed systems, API design, and database internals

• The ability to get up to speed on unfamiliar code without hand-holding. You read READMEs, trace execution, ask sharp questions, and start adding value fast

• A track record of owning outcomes, not just tickets. You raise risks early, communicate progress proactively, and care about what ships

• The ability to diagnose and debug complex issues, optimize application performance, and identify areas for improvement before they become problems

• Hands-on experience with modern AI developer tools, such as Cursor or Claude Code, and a real working practice built around using them for code comprehension, test scaffolding, documentation, debugging, and ramp

• Your application will stand out if you have:

  • Experience 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)

  • A genuine interest in exploring how AI can enhance developer workflows and improve product functionality

  • Github activity showing thoughtful, relevant contributions

• Compensation Range: $110K - $140K + equity. The compensation range provided is an estimate. Actual compensation is determined based on job level, interview performance and alignment with the skills and applicable experience needed for this role.

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.

Candidate Privacy Notice

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