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Senior Software Engineer; Mobile Developer - Mobile App

Job in Boston, Suffolk County, Massachusetts, 02298, USA
Listing for: Klaviyo
Full Time position
Listed on 2026-01-30
Job specializations:
  • Software Development
    App Developer - Mobile/Web, Full Stack Developer, Android Developer, iOS Developer
Job Description & How to Apply Below
Position: Senior Software Engineer (Mobile Developer) - Mobile App Growth

Overview

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying.

Want to learn more about life at Klaviyo? Visit  to see how we empower creators to own their own destiny.

Why You Should Join the Mobile App Growth Team

The Mobile App Growth team is a diverse group of accomplished engineers focused on developing new, greenfield projects within the mobile application domain. Their work is cross-functional, spans various mobile platforms, and includes developing full-stack solutions to support product features exposed to mobile users via our SDKs. Over the past year, the team has introduced new mobile-first features (like geofencing and in-app forms) and enhanced Klaviyo’s mobile integration offerings, expanding the scope of responsibilities.

With new products to cultivate and integrations to support, the team seeks a highly capable Senior Software Engineer to help manage the increasing demands within Klaviyo s mobile ecosystem. This role will contribute to the expansion and maintenance of iOS and React Native initiatives, furthering current product features and extending Klaviyo’s reach beyond traditional email marketing into comprehensive mobile engagement.

How

You Will Make An Impact
  • Be a core member of the Mobile App Growth team, delivering impactful mobile experiences and making mobile integrations a core pillar of Klaviyo’s offerings
  • Work closely with product to provide the best experience for our customers
  • Collaborate with and mentor junior engineers, providing feedback and guiding them on projects
  • Take ownership of cross-functional projects from inception to release
  • Work across different mobile technologies with a focus on iOS and React Native
  • Work in the Django framework to help build out a pipeline for rendered mobile experiences
Who You Are
  • Deep experience in modern iOS development
  • Exposure and familiarity with React Native development
  • Open to working with different technologies:
    Python, React, AWS, GoLang, Android, Flutter (prior experience not required but nice to have)
  • Proven track record of leading complex projects and collaborating across multiple teams
  • Experience working with mobile webviews and location services
  • Comfortable leveraging AI technologies to contribute effectively to different domains
  • Self-starter with expertise in greenfield iOS development
  • Adaptability to work across native SDKs, backend and frontend Klaviyo stacks and potential expansion into tertiary SDKs
  • Ambition to take ideas and headline them in the future
  • Continuous learner, eager to explore new technologies and approaches
Technologies We Use
  • iOS (Swift)
  • Android (Kotlin)
  • React Native
  • Flutter
  • React, Type Script, Redux
  • Python, Django, Go Lang
  • MySQL, Redis, DynamoDB
  • AWS (EC2, RDS, Aurora), Terraform

We use Covey as part of our hiring and/or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.

Please see the independent bias audit report covering our use of Covey here.

Legal and Compliance

Massachusetts Applicants — It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include…

Position Requirements
10+ Years work experience
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