Sr. Fullstack Engineer

Sr. Fullstack Engineer | New Hope, Pennsylvania, United States Sr. Fullstack Engineer - 100% Remote (EST Hours) - Contract to Hire About the Role Apex Systems is seeking a highly skilled Sr. Fullstack Engineer to join an innovative team driving the next evolution of a multi-tenant SaaS IoT platform for the construction and industrial equipment sector. Work 100% remotely, solving complex technical challenges and shaping the future of connected equipment solutions within a high-performing, collaborative environment. Thrive in a design-first culture with cutting-edge technology and ample career growth opportunities as you deliver real-world impact. Responsibilities - Architect, design, and develop new features for a robust, event-driven IoT platform supporting real-time telemetry from distributed assets (bulldozers, heavy machinery, etc.). - Write high-quality, efficient, scalable, and reusable code using Node.js (Hapi.js/Express.js) on the backend and React with micro-frontend architecture on the frontend. - Tackle system scalability, performance optimization, API design, and latency issues within a large-scale, distributed environment. - Own the reliability of your code by writing comprehensive unit tests and supporting rigorous QA processes. - Mentor and coach fellow engineers, providing technical leadership and contributing to architectural decisions. - Collaborate with product managers and senior leadership to define, scope, and plan innovative new features and long-term product direction. - Work cross-functionally with agile teams to deliver user-centric solutions and improve development processes. - Document solutions thoroughly for maintainability and knowledge sharing. Required Skills and Experience - 8+ years professional development experience as a Full Stack Engineer building complex, large-scale platforms. - Deep hands-on expertise in JavaScript, Node.js (Hapi.js/Express.js), and React (including micro-frontend architecture). - Proven experience designing and maintaining microservices-based architectures and robust SQL database solutions. - Demonstrated ability to solve complex technical and business problems across diverse software architectures. - Experience building real-time event processing platforms and optimizing for system scalability, API performance, and latency reduction. - Strong understanding of backend architecture and system tradeoffs. - Bachelor's degree in Computer Science or equivalent practical experience. - Engineers with C#, .NET, or Python backgrounds are welcome if eager to transition into a JavaScript/Node.js-centric stack. Preferred Skills - NoSQL databases - Docker/containerized deployments - Experience with large-scale data systems - Message queueing (RabbitMQ) - AWS ecosystem (EC2, S3, VPC, Elasticsearch, Kinesis) - IoT platform experience Benefits - 100% remote work (must work EST hours) - High-impact, real-world projects with visible outcomes - Dynamic, collaborative, and supportive team culture - Career advancement and skill development in modern technologies - Opportunity to lead and mentor within a growing organization How to Apply Take the next step in your career and join a team where your expertise makes a tangible difference. Apply now through Apex Systems to connect with our recruiting team and learn more about this exciting opportunity.