Full Stack Engineering Intern

Annual releases gave way to two-week sprints years ago, and the platform now handles over 200 million API calls a day. Thomas Systems employs 1,000 people across engineering hubs in New York City and three other locations, building ERP software for mid-market manufacturers.

About the internship

Thomas Systems is hiring a Full Stack Engineering Intern for Jan 2027. Thomas Systems needs a web development intern to help build and maintain our customer dashboard and marketing pages. The stack is React, Node.js and MongoDB. You can work from home anywhere in the US. We have no office requirement. A quiet workspace and good internet are required.

What you'll do

• Convert Figma designs into responsive pages using React, HTML, CSS and Tailwind.
• Build reusable UI components and add them to the shared component library.
• Push code to GitHub through feature branches and pull requests.
• Connect frontend screens to REST APIs and handle loading and error states properly.
• Check pages with Lighthouse and fix accessibility issues such as missing alt text and low contrast.
• Attend sprint planning and the twice-weekly standup over Google Meet.
• Write simple Express.js routes and MongoDB queries for new features.

Who you are

• Available 40 hours a week for the full internship.
• Based in the US for the duration of the internship.
• Laptop that can run Node.js and VS Code smoothly, and a stable internet connection.
• Basic Git: cloning, branching, committing and opening a pull request.
• Clear written English for Slack updates and ticket comments.
• Willing to learn new tools quickly and ask questions when blocked.

Preferred qualifications

• Experience with Next.js or TypeScript.
• Projects deployed on Vercel, Netlify or Render.
• Some knowledge of MongoDB, MySQL or Firebase.

What you get out of it

• Proper Git workflow with branches, reviews and release tags.
• Writing frontend code that other people can read and maintain.
• Strong interns get a full-time offer or a paid extension.

Program dates: Jan 2027, 12 weeks.

Intern pay: $39.50-$55.50/hr

Perks

• Final presentation to leadership.
• Return offer opportunities.
• Company laptop.

Thomas Systems is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status.

Duration: 12 weeks. Start: Jan 2027.

Demo job created on 11jobs for testing and demonstrations. It is not an actual opening at Thomas Systems LLC.