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Intern Full Stack Software Developer Jobs in Claymont, DE

Next Step Systems

Full Stack Developer

Philadelphia, PA · On-site

Full Stack Developer, Philadelphia, PA We are seeking a Full Stack Developer to work on a team building custom software for great customers using modern technologies and Agile methods. The Full Stack ...

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How much do intern full stack software developer jobs pay per hour?

As of Aug 21, 2026, the average hourly pay for intern full stack software developer in Claymont, DE is $22.34, according to ZipRecruiter salary data. Most workers in this role earn between $18.08 and $23.70 per hour, depending on experience, location, and employer.

What is an intern full stack software developer?

An Intern Full Stack Software Developer is a trainee who assists in building and maintaining both front-end and back-end components of web applications. They work with various programming languages, frameworks, and databases to develop software solutions under the guidance of senior developers. Responsibilities may include writing code, debugging, testing, and collaborating with teams to improve functionality. This role provides hands-on experience in full-stack development and helps interns build practical skills for a career in software engineering.

What do intern full stack software developers do?

As an Intern Full Stack Software Developer, you can expect to work on a variety of tasks spanning both the front-end and back-end of web applications, such as building user interfaces, developing APIs, troubleshooting bugs, and writing automated tests. You may also assist with integrating new features or improving the performance of existing software under the guidance of experienced developers. Collaboration is a big part of the role, so you’ll likely participate in team meetings, code reviews, and brainstorming sessions. These experiences offer valuable exposure to real-world software development processes and best practices, setting a strong foundation for future career growth.

What skills and qualifications are needed to thrive as an intern full stack software developer?

To thrive as an Intern Full Stack Software Developer, you need a solid understanding of both front-end and back-end programming languages such as JavaScript, HTML/CSS, and one or more back-end frameworks, often supported by ongoing studies in computer science or a related field. Familiarity with version control systems like Git, database technologies, and popular development tools or cloud platforms is highly beneficial. Strong problem-solving abilities, communication skills, and a willingness to learn make candidates stand out in this position. These skills and qualities enable interns to effectively contribute to diverse technical projects, collaborate with team members, and adapt quickly to the fast-paced software development environment.

What are the most commonly searched types of Full Stack Software Developer jobs in Claymont, DE?

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Intern Full Stack Software Developer jobs near you
Infographic showing various Intern Full Stack Software Developer job openings in Claymont, DE as of August 2026, with employment types broken down into 1% As Needed, 85% Full Time, 10% Part Time, and 4% Contract. Highlights an 89% Physical, 4% Hybrid, and 7% Remote job distribution, with an average salary of $46,457 per year, or $22.3 per hour.

Sr. Full Stack Software Developer

Holtec International

Camden, NJ • On-site

Full-time

Re-posted 5 days ago

Holtec International rating

8.0

Company rating: 8.0 out of 10

Based on 16 frontline employees who took The Breakroom Quiz

178th of 491 rated machine equipment manufacturers

Job description

Job Summary:
Holtec International is a company focused on innovative solutions in the engineering sector. They are seeking a Senior Full Stack Software Developer to design, develop, and maintain enterprise applications while serving as a technical subject matter expert and partnering with stakeholders to deliver high-quality software solutions.
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
Qualifications:
Required:
• 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
Company:
Holtec International is a global turnkey supplier of equipment and systems for the energy industry. Founded in 1986, the company is headquartered in Jupiter, USA, with a team of 501-1000 employees. The company is currently Late Stage.

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