Senior Software Engineer, Integrations Team (Fullstack or Backend)

About OneSignal

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 billions of messages daily.

1 in 5 new apps launches using OneSignal! We support companies in 140 countries, including Zynga, USA Today, Bitcoin.com, 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, Colorado, Massachusetts, New York, New Jersey, Oregon, 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. Our blog contains more information about the OneSignal Engineering career ladder, and our diverse team.

About The Team

The Integrations team is a collaborative group of engineers who thrive on solving complex technical challenges while maintaining a collaborative and supportive culture. We value engineers who bring strong opinions and aren't afraid to share them—healthy technical debate makes our solutions stronger. Our team works closely with the EPD organization and other cross-functional partners, so you'll have regular interaction with product managers, designers, and engineers from other teams.

We believe in ownership and autonomy. Team members take full responsibility for their projects from conception to production, including both the technical implementation and the user experience. While we tackle ambitious technical projects, we never lose sight of the customer impact and business outcomes that drive our work.

Our team culture emphasizes continuous learning and improvement. We regularly share knowledge, conduct technical discussions, and support each other's professional growth. Whether you're architecting a new system or polishing a user interface, you'll have the backing of a team that celebrates both technical excellence and collaborative problem-solving.

What You'll Do

• Collaborate closely with Product Managers, Designers, and Sales/Success teams to understand requirements and translate them into scalable platform solutions
• Actively participate in peer code reviews and Technical Design Spec reviews, providing valuable technical insights to continuously improve our codebase
• Collaborate with the team to efficiently resolve production issues and ensure the system scales smoothly to meet the increasing demands of our customers.
• Conduct data analysis and performance monitoring to identify areas for optimization and enhancement
• Stay up-to-date with the latest industry trends and technologies, incorporating new ideas into our engineering processes while being a thought leader on leveraging AI tools in our workflow

What You'll Bring

• 6+ years of professional software development experience
• Ability to work on a self-motivated, high performing team
• Experience with Rust and/or Golang, or a strong willingness to learn these two languages quickly
• Experience designing RESTful APIs and gRPC services
• Ability to work independently