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Internship Junior Mern Stack Developer Jobs (NOW HIRING)

Reailize

AI Full Stack Developer

Middletown, NJ · On-site

Internally, the applications are built on a MERN stack (MongoDB, Express.js, React, Node.js ... Do prompt engineering, tool/function calling, and agent workflows on top of AI SDKs. * Design ...

campus4tech

Mid-Level Node.js Developer

New Port Richey, FL · On-site

$46 - $59.50/hr

Full Stack developer, specializing in Back-end development with JavaScript & MERN stack * Work i ng in an Cloud environment, with Microservices architecture and Agile / DevOps practices ...

Spartan Technologies, Inc.

MERN Developer

Atlanta, GA · On-site

MERN Developer Full Stack Developer Are you looking for a fast-paced, engaging new challenge? We currently have an opportunity for a PERN/MERN Full Stack Developer on our CaseHub product, a web-based ...

Two95 International Inc.

Senior MERN Developer

$55.75 - $73.75/hr

Senior MERN Developer Location: 100% REMOTE Duration: Permanent with client Salary: Best Possible ... A minimum of three years working in the MERN Stack with expert skills in Node.js and Express * A ...

Tech Tammina LLC

Jr. Full-Stack Developer

Warren, MI · On-site

Role: Jr. Full-Stack Developer Location: Warren, MI Duration: Long term About the role: · We're ... internships, or personal projects welcome) · Familiarity with full-stack development using React ...

TECH Tammina

Jr. Full-Stack Developer

Warren, MI · On-site

Role: Jr. Full-Stack Developer Location: Warren, MI Duration: Long term What You'll Do: Make ... coursework, internships, or personal projects welcome) Familiarity with full-stack development ...

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How much do internship junior mern stack developer jobs pay per year?

As of Jul 17, 2026, the average yearly pay for internship junior mern stack developer in the United States is $88,976.00, according to ZipRecruiter salary data. Most workers in this role earn between $67,000.00 and $87,000.00 per year, depending on experience, location, and employer.

What are the key skills and qualifications needed to thrive as an Internship Junior MERN Stack Developer, and why are they important?

To thrive as an Internship Junior MERN Stack Developer, you need a foundational understanding of JavaScript, HTML, CSS, and core concepts of MongoDB, Express.js, React, and Node.js, usually gained through coursework or self-study. Familiarity with version control systems like Git, as well as experience using code editors and basic debugging tools, is typically expected. Strong problem-solving abilities, eagerness to learn, and effective communication skills help you integrate with teams and adapt to new challenges. These skills are essential for building functional web applications, collaborating in agile environments, and growing into more advanced development roles.

What is an Internship Junior MERN Stack Developer?

An Internship Junior MERN Stack Developer is an entry-level developer who is learning to build web applications using the MERN stack, which includes MongoDB, Express.js, React.js, and Node.js. During their internship, they assist with coding, debugging, and testing web applications under the guidance of senior developers. This role helps interns gain practical experience with full-stack JavaScript development and prepares them for more advanced positions in web development.

What types of projects can an Internship Junior MERN Stack Developer expect to work on, and how are tasks typically assigned within the team?

As an Internship Junior MERN Stack Developer, you will often work on real-world web applications, assisting with both front-end and back-end development tasks using MongoDB, Express.js, React, and Node.js. Tasks are usually assigned by senior developers or a project manager, and may include bug fixing, implementing new features, writing unit tests, or improving user interfaces. You'll likely participate in daily stand-up meetings and collaborate closely with other developers, designers, and sometimes even clients, gaining exposure to agile development practices. This collaborative environment helps you build both technical and teamwork skills, preparing you for more advanced roles in the future.
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Internship Junior Mern Stack Developer jobs near you
Infographic showing various Internship Junior Mern Stack Developer job openings in the United States as of July 2026, with employment types broken down into 100% Full Time. Highlights an 100% In-person job distribution, with an average salary of $88,976 per year, or $42.8 per hour.

AI Full Stack Developer

Reailize

Middletown, NJ • On-site

Full-time

Posted 8 days ago

Job description

Join Reailize - where innovation meets impact. We're on a mission to help global enterprises work smarter, faster, and more efficiently at the cutting edge of AI, data, and cloud. By combining deep expertise, advanced engineering, and patented software, we transform complexity into opportunity. Here, curiosity, collaboration, and bold ideas aren't just welcomed - they're celebrated.
What makes us different?
We are a private & global group of companies with 20+ years of proven track record, supporting leading organizations in Telecom, Security, and Real Estate across North America, Europe, the Middle East, and Latin America.
About the Role
We are looking for an AI Full Stack Developer to design, build, and deploy intelligent web applications powered by large language models and AI SDKs. You will own features end to end from the user interface and backend services to the LLM-based capabilities that drive them and ship them into production.
Note on tech stack: Internally, the applications are built on a MERN stack (MongoDB, Express.js, React, Node.js). Direct experience with this stack to build web based application is a plus, but we're primarily hiring for strong full-stack and AI-building ability the right candidate can ramp on our specific stack quickly.
Work Model: For US candidates, please note that this role is based in Middletown, NJ and is 100% onsite. For candidates in Quebec, this is a hybrid role, 3 days onsite out of our Montreal office.
Responsibilities:
  • Design, build, and maintain full-stack web applications with AI-powered features.
  • Build and integrate LLM-based features chat, copilots, summarization, extraction, and retrieval-augmented generation into products.
  • Do prompt engineering, tool/function calling, and agent workflows on top of AI SDKs.
  • Design evaluation and guardrail patterns for AI features (quality, safety, cost, latency).
  • Develop scalable, secure backend services and APIs that wrap AI capabilities.
  • Create responsive, reusable, maintainable user interfaces for AI features.
  • Integrate AI SDKs, embedding models, and vector retrieval with internal services.
  • Deploy applications and AI services to cloud environments.
  • Set up CI/CD and monitor production AI features for latency, cost, and quality drift.
  • Troubleshoot issues across the full stack.
  • Work with product, design, and engineering teams in an Agile environment.
  • Apply security best practices across applications and AI integrations.

Qualifications:
  • Degree in computer science, AI, data science, or a related field (or equivalent experience).
  • Strong programming skills, including a primary web-focused language and a language commonly used for AI/ML work.
  • Direct experience with the MERN stack (MongoDB, Express.js, React, Node.js).
  • Experience building AI agents or multi-step LLM workflows.
  • Proven experience building production web applications end to end.
  • Experience building features on top of large language models and AI SDKs prompt engineering, retrieval, and function/tool use.
  • Experience building responsive user interfaces and robust backend services and APIs.
  • Experience designing and integrating APIs and service-oriented architecture.
  • Familiarity with embeddings, vector retrieval, and retrieval-augmented generation patterns. • Familiarity with containers and automated deployment pipelines.
  • Understanding of cloud deployment and infrastructure.
  • Strong understanding of authentication, authorization, and API security.
  • Comfort with version control and collaborative development workflows.
  • Strong debugging and problem-solving skills.

Interview Integrity:
During the interview process, we're evaluating your individual problem-solving skills, creativity, and approach to challenges. While AI tools like ChatGPT, Claude, and Cursor are part of your daily toolkit once you join B-Yond, all interviews, assessments, and take-home assignments must be completed independently.
You may not use AI tools, third-party services, coaching platforms, or content-farming services during any part of the interview process unless we explicitly permit it. We will clearly communicate when AI tools are allowed for specific assessments.
Any indication of third-party assistance or AI-generated responses will result in immediate disqualification.

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