Sr. Fullstack Engineer

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.