We are looking for a Senior Mobile Developer to join our RUN support team, focused on delivering 16x7 mobile application support for global customers. This role requires a highly skilled and proactive professional with strong expertise in iOS development (Swift), Google Cloud Platform (GCP), and JavaScript. 

You will be part of a rotating shift team responsible for ensuring system uptime, performance, and rapid incident resolution.

You will

• Troubleshoot, resolve, and document iOS application issues in a production support setting. 
• Participate in incident response and root cause analysis (RCA), providing timely resolutions. 
• Provide hands-on technical support and maintenance across a suite of customer-facing applications. 
• Monitor and respond to incidents, outages, and system alerts within a 16x7 support model (9 am ET to 11 pm PT). 
• Troubleshoot and resolve issues in real time across iOS applications, backend services, and cloud infrastructure. 
• Collaborate with other engineers and stakeholders to stabilize, maintain, and improve existing mobile features. 
• Contribute to improving tooling, monitoring, and operational efficiency. 
• Write and maintain support documentation and knowledge articles. 
• Contribute to root cause analysis (RCA) reports and suggest long-term fixes for recurring issues. 
• Contribute to and help coordinate 16x7 support coverage, including shift handovers and escalation awareness. 
• Assist in the automation of monitoring and alerting systems to improve operational efficiency. 
• Participate in rotational on-call or flexible shift support schedules as required by the 16x7 operation. 

You have

• Proficient in English (written and verbal).
• 5+ years of professional experience in iOS application development.
• Expertise in iOS development with Swift and experience with Xcode and related tools.
• Strong proficiency in JavaScript, including debugging and cross-platform troubleshooting.
• Experience with Google Cloud Platform (GCP) services, deployment, and monitoring tools.
• Solid understanding of CI/CD pipelines, system monitoring, and log analysis.
• Proven experience in production support, SRE, or DevOps roles, ideally in high-availability environments.
• Strong communication skills and a customer-focused mindset.
• Ability to work in a rotational or flexible schedule to support 16x7 operations.
• Experience with RESTful APIs, mobile app deployment, and cloud-native architectures.
• Familiarity with Firebase, Cloud Functions, or other GCP-native technologies.
• Exposure to React or Node.js is a plus.
• Experience working in Agile/Scrum environment
• Experience working with global, multicultural teams. 

What We Offer:

• Maternity and parental leave extra days
• Competitive benefits packages
• Vacation, compassionate leave, sick days, and flex days
• Access to online services for families and new parents
• Diversity and Inclusion Board with 12 affinity groups
• Internal learning and development programs
• Enterprise-wide employee discounts
• And more…

At Critical Mass, we value our employees and offer competitive compensation and benefits packages.  If you’re looking for a challenging and rewarding opportunity to make a significant impact on the lives of our employees, we encourage you to apply for this exciting position today!

The Talent Team at Critical Mass is focused on ensuring we provide the best training, onboarding, and employee experience possible! Our new hires & employees are the future of our organization, and we want to set you up for long-term success. In an effort to do so, we expect our team to work from an office a minimum of 3 days a week.

Critical Mass is an equal opportunity employer. 

The Critical Mass Talent Acquisition team will only communicate from email addresses that use the URLs criticalmass.com and us.greenhouse-mail.io. We will not use apps such as Facebook Messenger, WhatsApp, or Google Hangouts for communicating with you. We will never ask you to send us money, technology, or anything else to work for our company. If you believe you are the victim of a scam, please review your local government consumer protections guidance and reach out to them directly.

If U.S. based: https://www.consumer.ftc.gov/articles/job-scams#avoidIf Canada based: https://www.canada.ca/en/services/finance/consumer-affairs.htmlIf U.K. based: https://www.gov.uk/consumer-protection-rightsIf Costa Rica based: https://www.consumo.go.cr/educacion_consumidor/consejos_practicos.aspx