Sr. Full Stack Software Developer

The Senior Software Developer plays a critical role in the design, development, and maintenance of enterprise applications, supporting both new development and legacy systems. This role serves as a technical subject matter expert, partnering with internal stakeholders to define solutions, guide architectural decisions, and deliver scalable, secure software in a complex, fast‑paced environment. The ideal candidate brings strong full‑stack expertise, sound technical judgment, and the ability to independently drive high‑quality solutions from concept through delivery. Location: Camden, NJ (On‑site) Primary Responsibilities: Serve as the technical subject matter expert across a portfolio of enterprise applications Partner with internal stakeholders to gather requirements, define scope, and identify risks early Translate complex business processes into sound technical designs and deliver solutions independently Design and document application architecture and database structures Enforce coding standards, architectural patterns, and development best practices Architect scalable, maintainable solutions and evaluate existing systems for optimization Perform peer code reviews and uphold high standards of code quality Apply and promote secure software development practices Identify technical risks and provide clear, actionable solutions Develop well‑structured, efficient, and maintainable code Estimate and scope work independently in planning sessions Maintain and enhance system and code documentation Mentor and support junior developers where applicable Requirements: Bachelor’s degree in Computer Science, Engineering, or a related field, with 10+ years of professional software development experience in enterprise environments Deep expertise in C#, .NET Core, and .NET Framework, with experience developing, maintaining, and modernizing both modern and legacy codebases across full‑stack applications Strong full‑stack development and architecture experience, including RESTful APIs, front‑end technologies (Blazor, HTML5, CSS3, JavaScript, Bootstrap), and scalable system design utilizing SOLID principles, design patterns, dependency injection, and CQRS Advanced SQL Server expertise, including schema design, index strategy, stored procedures, query optimization, and execution plan analysis Experience with enterprise authentication and authorization (OAuth2, OIDC, Azure AD / Entra ID or similar), along with secure development practices Proven ability to lead and own architectural decisions at both application and database levels, while working effectively across complex, multi‑application enterprise environments Strong experience improving and navigating legacy codebases, with a focus on enhancing performance, scalability, and maintainability Experience with Git-based version control, collaborative code review, DevOps practices (CI/CD pipelines), and containerization technologies (Docker) Familiarity with performance profiling and troubleshooting tools, application modernization/migration (.NET Framework to .NET Core), and emerging development practices including AI-assisted coding tools Strong communication and stakeholder management skills, with the ability to translate business requirements into technical solutions, work independently, manage priorities, and deliver high-quality outcomes High attention to detail with a strong focus on code quality, documentation, and user experience, including UI/UX considerations A Generation Ahead by Design™ Investing in people who power the future. We believe great work deserves great rewards. Our benefits go beyond the basics, reflecting our commitment to supporting your whole self…your health, your future, and your career growth. This includes: Compensation: Annual compensation based on skills and experience ranging from $120,000 to $150,000 Benefits: Industry‑leading medical, dental, and vision coverage with a generous employer premium contribution and Day 1 eligibility! FLEX Program – Hybrid work opportunities available for eligible roles, where business needs and role requirements allow 401(k) retirement plan with up to a 5% company match and immediate vesting to support long‑term financial security Paid time off and 11 paid holidays to support rest, balance, and recharge Wellness program offering rewards for participation in company‑supported health initiatives Commuter benefits supporting mass transit and commuter parking options Company‑paid life and AD&D insurance for added peace of mind Education assistance to support continued education and professional growth Employee support and voluntary benefits, including an Employee Assistance Program and optional coverage such as disability, legal, identity theft, and insurance programs Benefits eligibility and offerings may vary based on role, location, and employment status If you’re driven to solve meaningful challenges and make a lasting impact, we invite you to build your career at Holtec—a generation ahead by design™.