Senior Software Engineer, VoIP

In the time it takes you to read this job description, RapidSOS will have handled ~1,380 emergencies.

At RapidSOS, we are committed to using technology to build a safer, stronger future and working together to save lives. We’re in an exciting phase of growth, welcoming new members from across the globe to our mission-driven, ambitious, and inclusive team. Our work is founded on our values of trust and safety, pioneering, urgency, and purpose over pride, all of which support a company culture where people can innovate, collaborate, grow, and, above all, make an impact. If that sounds like an exciting opportunity, we want to hear from you!

RapidSOS is an intelligent safety company that harnesses artificial and human intelligence to fuse life-saving data from 600M+ connected devices, apps, and sensors from 200+ global technology companies to over 22,000 public safety agencies in six countries. Whether there’s an unsafe moment or an emergency, RapidSOS Ready devices, vehicles, homes, or buildings deliver essential data to the right place when it matters most. Learn more at www.RapidSOS.com.

What this role is about:
Are you passionate about building resilient, cutting-edge systems that drive real-world impact? At RapidSOS, we’re transforming emergency response with innovative technology that delivers critical, life-saving data to telecommunicators serving 99% of the U.S. population.

We’re seeking a Senior VoIP Engineer to build and maintain our live transcription and call recording systems—critical services that enable reliable, real-time communication during emergencies. In this role, you will architect and develop integrated SIP-based systems with a focus on reliability, scalability, and security. You’ll also develop tooling, capture analysis, and observability solutions to enhance performance and ensure seamless, real-time call workflows at scale

In this role, you’ll have the opportunity to collaborate with a mission-driven team to tackle complex engineering challenges and reimagine how emergencies are managed around the world. If you’re excited to make a tangible impact where every second counts, we’d love to hear from you.

What you’ll do: 

• Drive the architecture, development, and deployment of new features for SIP and voice-centric applications, including transcription solutions within a client/server environment
• Lead strategic architectural decisions, help drive alignment, and optimize applications for performance, scalability, and accessibility including testing capabilities
• Prototype and test new VoIP features to evaluate feasibility, drive innovation, and identify opportunities for system-wide performance improvements
• Ensure the reliability and performance of our voice infrastructure by monitoring device health and optimizing connectivity across large-scale, distributed deployments
• Collaborate with the Product team, Engineers, and other stakeholders to design solutions for the most critical challenges facing our public safety and B2B data partners in an agile environment
• Use best-in-class software development practices (unit tests, integration tests, performance tests, monitoring, detailed functional specification and test plans) to ensure RapidSOS' products remain highly reliable and fault tolerant
• Actively participate in code reviews and standups, sharing knowledge, championing best practices, and contributing to the continuous improvement of team processes
• Own meaningful parts of our platform, have an impact, grow with the company

What we’re looking for in our ideal candidate: 

• 7+ years of software engineering experience with 4+ years of relevant experience with VoIP/SIP
• Experience developing VoIP, SIP, and Real Time Communication services
• Experience developing Linux-based solutions in Python, Go, or C/C++, with proficiency ideally in Python or a willingness to learn it
• Understanding of network protocols, capture, and environments with technology like Wireshark, SIPp, libpcap, and BSD socket programming
• Experience scaling solutions with automated testing tools, frameworks and systems
• Ideally has experience building AI-driven features or using AI tools to enhance acceleration of development, and is proactive about leveraging emerging technologies
• Strong communication and interpersonal skills; is a team player with a positive attitude 
• Highly self-motivated; ability to adapt and learn quickly in a fast-paced environment with a strong sense of ownership
• You are self-directed and enjoy solving difficult problems in a collaborative environment
• You are passionate about building and releasing software that serves a vital purpose
• Ability and willingness to collaborate in-person a few times per quarter, or as needed

Nice-to-have experience (but not required!):

• Experience in Python
• Experience with AWS 
• Experience creating systems to test call flow scenarios and scalability using tools like SIPp
• Experience working with embedded systems or IoT devices
• Experience with development of network analysis equipment or call recording equipment that is deployed inside an Emergency Communications Center
• Experience with serial connected devices
• Understanding of software design principles with experience in RESTful APIs or RESTful web services
• Understanding of NG911 systems.

What we offer: 

• The chance to work with a passionate team on solving one of the largest challenges globally 
• Competitive salary and benefits and equity participation 
• A dynamic, flexible and fun start-up work environment with a highly talented team

If you're curious to learn more about RapidSOS, you can check out https://rapidsos.com/blog/ 

Starting pay for a successful applicant will depend on a variety of job-related factors, which may include experience, relevant skills, training, education, location, business needs, or market demands. The salary range for this role is $165,000 - $185,000. This role will also be eligible to receive equity options. #LI-Remote 

If you are based in California, we encourage you to read this important information for California residents linked here: https://rapidsos.com/privacy/california/