Senior Full Stack Software Developer - Node.js & React

For 75 years, Charles River employees have worked together to assist in the discovery, development and safe manufacture of new drug therapies. When you join our family, you will have a significant impact on the health and well‑being of people across the globe. Whether your background is in life sciences, finance, IT, sales or another area, your skills will play an important role in the work we perform.

In return, we’ll help you build a career that you can feel passionate about.

As a Senior Full Stack Engineer at Charles River, you will help shape how users interact with our applications by designing and building cloud‑native, modern web systems across the stack - from responsive user interfaces to resilient APIs and robust backend services. You will play a pivotal role in driving the architecture, scalability, and quality of digital solutions that support life‑saving therapies.

Note:

This role requires strong proficiency in Node.js and React. It is a fully remote position with occasional travel depending on business needs.

• Design, develop, and deploy full stack applications using modern JavaScript frameworks (React, Node.js).
• Build and maintain robust, scalable RESTful APIs and backend services.
• Develop responsive and intuitive front‑end UIs integrated with system APIs.
• Ensure code adheres to industry best practices, coding standards, and is well‑documented.
• Write and maintain automated unit, integration, and end‑to‑end tests (Jest, Playwright, etc.).
• Collaborate closely with cross‑functional teams including Product, Design, and Dev Ops.
• Architect and implement secure, performant systems using modern Dev Sec Ops  practices.
• Refactor and modernise legacy systems while maintaining business continuity.
• Stay up to date with advancements in web technologies, AI‑assisted development tools, and industry trends.
• Participate in code reviews, sprint planning, and retrospectives as part of an Agile team.

• Bachelor’s degree in Computer Science, Engineering, Information Systems, or equivalent experience.
• Proven experience with Node.js and React in building production‑grade applications.
• Proficiency in HTML / CSS / JavaScript, and experience with CSS preprocessors like SCSS / LESS.
• Experience building and consuming RESTful APIs;
  Graph
  
  QL is a plus.
• Knowledge of modern Dev Ops and CI/CD practices, cloud‑native development, and containerization (Docker, Kubernetes).
• Experience with data layers (e.g., Postgre
  
  SQL, Mongo
  
  DB, Redis).
• Strong understanding of software architecture, SOLID principles, and security best practices.
• Familiarity with observability tools (e.g., Open Telemetry, Prometheus) and logging frameworks.
• Experience integrating or utilising AI/ML tools (e.g., Git Hub Copilot, OpenAI API) is a plus.
• Excellent problem‑solving skills and ability to take ownership of features from design to deployment.

The Corporate Functions provide operational support across Charles River in areas such as Human Resources, Finance, IT, Legal, Sales, Quality Assurance, Marketing, and Corporate Development. They partner with their colleagues across the company to develop and drive strategies and to set global standards. The functions are essential to providing a bridge between strategic vision and operational readiness, to ensure ongoing functional innovation and capability improvement.

Charles River is an early‑stage contract research organization (CRO). We have built upon our foundation of laboratory animal medicine and science to develop a diverse portfolio of discovery and safety assessment services, both Good Laboratory Practice (GLP) and non‑GLP, to support clients from target identification through preclinical development. Charles River also provides a suite of products and services to support our clients’ clinical laboratory testing needs and manufacturing activities.

Utilizing this broad portfolio of products and services enables our clients to create a more flexible drug development model, which reduces their costs, enhances their productivity and effectiveness to increase speed to market.

With over 20,000 employees within…