Kustomer

Kustomer

Software Engineer, Full Stack (Senior, Staff+)

US - New York, NY · Staff+

Sponsorship not specifiedDetected 43 days ago
GoReactNode.jsDistributed SystemsFull-Stack DevelopmentData StructuresAlgorithmsCode ReviewGitMongoDBElasticsearchVector DatabasesAWSCloud PlatformsAPI DevelopmentMachine LearningComplianceAccessibilityCRMCustomer SupportHIPAAAdaptability

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.

Responsibilities

  • Develop APIs and integrate with external services and databases, ensuring data integrity and security
  • Build front-end interfaces with a focus on user experience, responsiveness, and accessibility
  • Design and build AI-powered features that improve the user experience and platform efficiency
  • Partner with PMs, engineers, and your Pod Lead to shape requirements, design, UX, and scope tradeoffs, communicating progress proactively along the way
  • Optimize application performance through caching, efficient algorithms, and database indexing
  • Share production support responsibility on a rotating basis, including on-call and bug triage, distributed equitably across the team
  • 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.

Requirements

  • 7+ years of progressive software development experience and a Bachelor's degree in Computer Science, Software Engineering, or a related field
  • What matters is that you can follow the work wherever it goes and aren't blocked by an unfamiliar layer.
  • You understand how systems work at depth and have experience with cloud platforms like AWS or similar.
  • Familiarity with integrating AI or ML-powered capabilities into web applications, even at a prototype or feature level
  • As a job applicant, you have the right to know and understand the categories of personal information we collect about you, and the purposes for which we use such personal information.
  • You're comfortable working across frontend and backend. You may have a stronger side, and that's fine. What matters is that you can follow the work wherever it goes and aren't blocked by an unfamiliar layer.
  • You understand how systems work at depth and have experience with cloud platforms like AWS or similar. Data structures, algorithms, concurrency, distributed systems, API design, database internals; these are tools, not trivia.
  • You don't need to be the domain expert before contributing. You read READMEs, trace execution, ask sharp questions, and start adding value fast.
  • You own the outcome, not just the ticket. You raise risks early, communicate progress proactively, and care about what ships, not just what you committed.
  • You're able to diagnose and debug complex issues, optimize application performance, and identify areas for improvement.
  • You have hands-on experience with modern AI developer tools, such as Cursor or Claude Code, and have built a real working practice around using them as a force multiplier for code comprehension, test scaffolding, documentation, debugging, and ramp.

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.
  • 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.

Company info

  • Kustomer only contacts candidates from company email addresses ending in kustomer.com and does not seek funds from candidates in any circumstances.
  • Kustomer was founded in 2015 by serial entrepreneurs Brad Birnbaum and Jeremy Suriel and has raised over $230M in funding backed by leading VCs.

Visa & Work Authorization

  • 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
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This listing is sourced directly from Kustomer's careers page and normalized into a canonical job model.