Fullstack Engineer

Sr. Fullstack Engineer - 100% Remote (EST Hours) - Contract to Hire, 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.

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, 8+ years full stack DevelopmentBackend- Nodejs Frontend- React Candidate built a real-time event processing platform handling X volume of dataResponsible for API design system scalability and performance optimizationAddressed issues around latency and system bottlenecks by implementing XDemonstrates strong understanding of backend architecture and system tradeoffs

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

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.