Full Stack Engineer – Cloud PBX Platform

Join a project to build and enhance a cloud-based business communications platform tailored for independent professionals and small businesses. This role focuses on developing a robust application that delivers a dedicated business phone number, customer calling, SMS messaging, voicemail, and advanced cloud PBX features. You will work with an existing design and implement it across both web and mobile platforms, ensuring a seamless and reliable user experience.Responsibilities Develop and maintain the platform using React Native, React.js, TypeScript, Node.js, Express.js, and REST APIs Integrate Twilio, TwiML, and AI/LLM capabilities to enable intelligent call, message, and voicemail workflows Implement business-number provisioning, call routing, messaging, and voicemail handling Collaborate with stakeholders to ensure the design is faithfully executed across all devices Optimize application performance, reliability, and scalability for business-critical communications Troubleshoot and resolve technical issues related to telephony and messaging systemsSkills And Requirements Proven experience building cloud-based telephony or PBX systems Strong proficiency in React Native, React.js, TypeScript, Node.js, and Express.js Hands-on expertise with Twilio APIs, TwiML, and integrating AI/LLM features into communication workflows Solid understanding of RESTful API design and implementation Ability to deliver high-quality, maintainable code for both web and mobile environments Experience with business communications platforms, including call routing, SMS, and voicemail Familiarity with cloud infrastructure and deployment best practices Excellent problem-solving skills and attention to detail Strong communication and collaboration abilities Availability for a full-time contract positionAbout TwineTwine is a leading freelance marketplace connecting top freelancers, consultants, and contractors with companies needing creative and tech expertise. Trusted by Fortune 500 companies and innovative startups alike, Twine enables companies to scale their teams globally.Our MissionTwine's mission is to empower creators and businesses to thrive in an AI-driven, freelance-first world.