Engage customers through personalized omni-channel messaging

Senior Software Engineer, SDK

$160K - $180K
United States (Remote) / Remote (CA, US; WA, US; UT, US; TX, US; PA, US; New York, NY, US)
Job Type
6+ years
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About the role

OneSignal is a leading omnichannel customer engagement solution, powering personalized customer journeys across mobile and web push notifications, in-app messaging, SMS, and email. On a mission to democratize engagement, we enable over a million businesses to keep their users - including readers, fans, players and shoppers - engaged and up to date by delivering 12 billion messages daily. 

1 in 5 new apps launches using OneSignal! We support companies in 140 countries, including Zynga, USA Today,, Eventbrite, Tribune, and many more - from startups and small businesses just getting off the ground to established companies communicating with millions of customers.

We’re Series C, venture-backed by SignalFire, Rakuten Ventures, Y Combinator, HubSpot, and BAM Elevate. We offer remote work as the default option in the United States in California, New York, Pennsylvania, Texas, Utah and Washington. As well as in the UK and Singapore - with plans to expand the locations we support in the future. Some roles are hybrid roles and will be listed as such. We have offices in San Mateo, CA and London, UK, and offer flex seating options for employees to work together in-person where we don't have offices. Hiring in Singapore is done in partnership with a local PEO.

OneSignal has a lot of the great tech startup qualities you'd expect, but we don't stop there. Our massive scale and small team, emphasis on healthy life balance and kindness in all our interactions, and focus on ownership and personal growth make OneSignal a uniquely great place to work. 


About The Team:

As an SDK-centric company, we’re constantly evolving our offerings and improving the Developer Experience across the board.  With that objective in mind, we are looking for experienced Software Engineers to join our SDK Team. 

The SDK Team is responsible for the components of our software stack that we ship to our customers.  These include client libraries for our REST API, CLI Tools, libraries embedded in customer applications(e.g. the Android SDK), and associated tooling and resources. 

Understanding how to better serve our developers is part of the work we do in the SDK Team.


What You'll Do:

  • Solving challenging business use-cases in a project with elegant, readable code and clear tests
  • Developing prototypes and analyzing user needs and software requirements to determine feasibility of design within time and cost constraints
  • Crafting APIs that are both robust and easy to use for a wide range of use cases
  • Engaging with developers on GitHub, troubleshooting customer issues, and developing or directing software system testing or validation procedures, programming, or documentation
    Researching ecosystem trends, upstream software changes, and deepening domain knowledge


What You'll Bring:

  • At least 6 years experience working as a software engineer.
  • Deep experience with developing applications for one or more of the following platforms: Android, iOS, Web, Unity, .Net/Xamarin, React Native, Flutter, Cordova.
  • Comfortable working in a distributed team with autonomy.
  • Passion for building tools for frontend developers.
  • Experience interacting with RESTful and RPC APIs.
  • Interest in working with a diverse group of polyglot codebases (Java, Kotlin, Obj-C, Swift, TypeScript, C#, JavaScript, PHP, Java, Dart, Ruby, and more).


Preferred skills and experience:

  • Experience writing SDKs, Client Libraries, or other Developer Tools.
  • Broad knowledge of development environments.
  • Active engagement with a developer community.
  • Enjoys interacting with a developer ecosystem and is experienced in leveraging empathy for making better developer products.

The New York and California base salary for this full time position is between $160,000 to $180,000. Your exact starting salary is determined by a number of factors such as your experience, skills, and qualifications. In addition to base salary, we also offer a competitive equity program and comprehensive and inclusive benefits.


Qualities we look for:

  • Friendliness & Empathy
  • Accountability & Collaboration
  • Proactiveness & Urgency
  • Growth Mindset & Love of Learning

In keeping with our beliefs and goals, no employee or applicant will face discrimination/harassment based on: race, color, ancestry, national origin, religion, age, gender, marital domestic partner status, sexual orientation, gender identity, disability status, or veteran status. Above and beyond discrimination/harassment based on 'protected categories,' we also strive to prevent other, subtler forms of inappropriate behavior (e.g., stereotyping) from ever gaining a foothold in our office. Whether blatant or hidden, barriers to success have no place in our workplace.

Applicants with disabilities may be entitled to reasonable accommodation under the terms of the Americans with Disabilities Act and certain state or local laws. A reasonable accommodation is a change in the way things are normally done which will ensure an equal employment opportunity without imposing undue hardship on OneSignal. Please inform us if you need assistance completing any forms or to otherwise participate in the application and/or interview process.

OneSignal collects and processes personal data submitted by job applicants in accordance with ourPrivacy Policy - including GDPR and CCPA compliance. Please see our privacy notice for job applicants.

About OneSignal

We started as app developers who just wanted a developer-friendly API for push notifications. Finding no good solution, we built one ourselves.

Today, OneSignal is the leading solution for sending effective messages across channels including mobile push notifications, web push notifications, in-app messaging, SMS, and email. We support over 1,800,000 of the world's leading marketers and developers.

OneSignal is available on every platform and development environment, letting content creators focus on quality user engagement instead of complex implementation.

We are growing faster than ever, and hiring in all departments. We hope you'll apply and we look forward to meeting you!

Team Size:150
Location:San Mateo, CA
George Deglin
George Deglin
Long Vo
Long Vo