Full Stack Engineer / Application Owner

Role: Full Stack Engineer / Application Owner

Location: North Andover, MA - Onsite

Contract: Fulltime

Job Description

Role Overview

We are seeking a Full Stack Engineer experienced in building and managing modern web applications

with React, Node.js, AWS, MySQL, and PostgreSQL. The candidate will take responsibility for an

existing application, understand it end-to-end, and ensure a seamless transition from the current

resource.

The role requires strong technical depth across backend, frontend, and cloud infrastructure, combined

with an ownership mindset to manage application health, enhancements, and stakeholder

communication.

Key Responsibilities

• Take complete ownership of an existing full stack application hosted on AWS.
• Work closely with the current resource to understand the system's architecture, data model, APIs, and integrations.
• Maintain and enhance backend services built with Node.js, ensuring scalability, reliability, and
• performance.
• Develop and optimize frontend components using React for a seamless user experience.
• Manage and optimize relational databases (MySQL and PostgreSQL) for high availability and efficient performance.
• Implement application deployments, monitoring, and cost optimization strategies on AWS.
• Troubleshoot issues across the stack (frontend, backend, database, cloud).
• Collaborate with stakeholders and act as the single point of accountability for the application.

Required Skills & Experience

• Strong experience with AWS services (EC2, RDS, S3, Lambda, API Gateway, etc.).
• Proficiency in Node.js for backend development.
• Expertise in React.js for modern frontend development.
• Solid understanding and hands-on experience with MySQL and PostgreSQL (schema design,
• indexing, query optimization).
• Knowledge of REST APIs, authentication, and integration best practices.
• Ability to quickly analyze, document, and own existing systems.
• Strong problem-solving and debugging skills.
• Excellent communication skills for cross-functional collaboration.

Preferred Qualifications

• Familiarity with CI/CD pipelines and DevOps practices.
• Experience with containerization (Docker, Kubernetes) on AWS.
• Exposure to caching (Redis, Memcached) and messaging systems.
• Background in application transition or ownership roles