Sr. Full Stack Engineer

ADDMAN Engineering LLC • Fort Myers, FL

5d • Remote

About The Position

The Sr. Full Stack Engineer is a key contributor within the IT organization responsible for the architecture, development, deployment, and maintenance of full-stack applications that power ADDMAN’s business operations. This role will play a pivotal part in building out the development department at ADDMAN, designing and delivering distributed systems end-to-end—from backend service workers and middleware through business logic, routing, and user-facing interfaces.

This role leads the design, development, and operation of full-stack applications built on a modern technology stack: React (with Vite) on the frontend, C# and Node.js (Fastify) on the server side, and a backend infrastructure spanning PostgreSQL, SQL Server, Redis, and MongoDB, with business functions deployed in C#. The Sr. Full Stack Engineer is expected to own solutions end-to-end—including architecture, coding, data modeling, deployment, monitoring, and ongoing maintenance—while producing the documentation and project roadmaps needed to scale the team.

Reporting directly to the VP of IT, this role bridges software architecture, application engineering, and data engineering. The ideal candidate is a self-starter who thrives in a fast-paced environment with evolving priorities, and plays a core part in delivering the digital backbone for “One Company.”

This position is subject to the International Traffic in Arms Regulations (ITAR) which requires U.S. citizen status. This is a fully remote position, with some travel to ADDMAN sites required as needed.

Requirements

• Expert-level proficiency in C# and Node.js, including hands-on experience building production-grade services, APIs, and business logic.
• Strong frontend development skills with React and Vite, including component architecture, state management, and performance optimization.
• Demonstrated experience architecting distributed systems, including service workers, middleware for business logic and routing, and full-stack applications delivered end-to-end.
• Strong data analysis skills with hands-on experience across multiple databases—primarily PostgreSQL and SQL Server—and working familiarity with Redis and MongoDB.
• Self-starter who is comfortable working in a fast-paced environment with changing demands; able to prioritize independently and drive work to completion with minimal oversight.
• Familiarity with standard SDLC patterns, agile practices, version control (Git), CI/CD pipelines, and the ability to create and maintain technical documentation and project roadmaps independently.

Nice To Haves

• Industry experience (e.g., manufacturing, engineering, technology, or similar) is a plus.
• Experience with Fastify, Redis, MongoDB, cloud deployment, and observability tooling is also a plus.

Responsibilities

• Architect, develop, and maintain full-stack applications end-to-end, including frontend (React/Vite), backend services (C# and Node.js/Fastify), middleware for business logic and routing, and backend data infrastructure (PostgreSQL, SQL Server, Redis, MongoDB).
• Design and implement distributed systems, including backend service workers, business-logic middleware, API routing layers, and user-facing interfaces that operate reliably at scale.
• Develop, deploy, and maintain business functions in C#, as well as server-side applications using C# and Node.js (Fastify), ensuring performance, security, and maintainability across environments.
• Model, query, and optimize data across relational and non-relational stores—primarily PostgreSQL and SQL Server, with Redis for caching and MongoDB for document workloads—and perform data analysis to support data-driven decision making.
• Own the full software development lifecycle (SDLC) using standard patterns—requirements, design, development, testing, deployment, and maintenance—including CI/CD, version control, code reviews, and release management.
• Produce and maintain clear technical documentation, including architecture diagrams, API references, deployment runbooks, and a living project roadmap that aligns engineering work with business priorities.
• Partner with stakeholders across the business to translate requirements into reliable, maintainable software—delivering features iteratively in a fast-paced environment with changing demands and shifting priorities.
• Monitor, troubleshoot, and continuously improve application performance, reliability, and security across production environments, and mentor other engineers as the development department grows.
• Help shape the long-term engineering and application strategy in partnership with the VP of IT. Other duties as needed by the company and departments.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior