Sr. Full Stack Engineer

Sr. Full Stack Engineer

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.

Essential Job Functions

• 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.

Skill 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.

Qualifications

• Bachelor's degree in Computer Science, Software Engineering, Information Systems, or related field (Master's degree preferred).
• 8–12+ years of professional software engineering experience, with deep expertise across the full stack (frontend, backend services, middleware, and databases).
• 3–5+ years of experience designing and operating distributed systems in production, including C#, Node.js, React, and relational databases (PostgreSQL and/or SQL Server).
• 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.

Work Environment

• The performance of this position will require exposure to the manufacturing areas where all areas require the use of personal protective equipment such as safety glasses, hearing protection, and other mandatory safety equipment.
• For the most part, ambient temperatures with typical plant lighting and manufacturing equipment are present throughout the facility.

Physical Demands

• Sit and stand as needed. Walking primarily on a level surface for periodic periods throughout the day.
• Reaching above shoulder height, below the waist, or lifting as required to reach documents or store materials throughout the workday. Proper lifting techniques required.
• Ability and comfortability to work in small confine spaces while following proper safety protocol.

Safety and Policy Practices

Each employee must be knowledgeable of standard safety policies and procedures and adhere to the same while supporting the goals and objectives of the organization and recognizing the Company's need to achieve its business objectives. Each employee is responsible for complying with company hazardous waste disposal procedures

Affirmative Action

ADDMAN Engineering is proud to be an Equal Opportunity Employer of Minorities, Women, Protected Veterans, and Individuals with Disabilities. All terms and conditions of employment will be administered without regard to an individual's sex, gender identity, sexual orientation, race, color, religious creed, national origin, physical or mental disability, protected veteran status, or any other characteristic protected by applicable law.

NOTE: This job description is intended to describe the general level of work being performed. This job description is not intended to be all-inclusive. The duties of this position may change from time to time, and the employee may perform other related duties to meet the ongoing needs of the organization. ADDMAN Engineering reserves the right to add, delete or modify these duties and responsibilities at its discretion. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions of this position. Employment is at-will, and nothing in this job description is intended to create or imply a contractual relationship or alter the at-will status of the employee.