Senior Full-Stack MERN Developer (Contract / Hybrid)

Calqulate; Chicago (IL); Hybrid; USD 140,000 - 180,000; Full time

Job summary

Calqulate is seeking an experienced Senior Full-Stack MERN Developer for a 6-month hybrid contract in downtown Chicago. You will design, develop, test, and deploy data analytics solutions and modules across the full stack using MongoDB, Express.js, React.js, Node.js, SQL, and AWS.

The role requires 6–10 years of professional experience with MERN, strong SQL and AWS skills, and the ability to mentor junior developers while following CI/CD practices in a hybrid work model.

Qualifications

• 6–10 years of professional full-stack web development experience focusing on MERN stack.
• Strong proficiency in SQL databases and data manipulation.
• Hands-on experience deploying and managing applications on AWS.
• Deep experience with Git and collaborative workflows.
• Knowledge of software design patterns, unit testing, CI/CD, and documentation.
• Must reside locally in the Chicago metro area and be able to work 3 days/week on-site in downtown Chicago.

Responsibilities

• Independently design, develop, test, and debug web applications using the MERN stack and SQL databases.
• Deploy, manage, and maintain AWS-based application environments.
• Support data migrations and analytics integration for complex workflows.
• Manage Git workflows, branching, PR reviews, and CI/CD pipelines.
• Mentor junior developers and provide Tier-3 technical support as needed.
• Leverage AI-driven developer tools to accelerate feature delivery.

Skills

MERN stack

Full-stack development

SQL databases

AWS

Git/DevOps

CI/CD

Tools

MongoDB

Express.js

React.js

Node.js

SQL

AWS

Job description

Location: Chicago, IL (Loop / Downtown – Hybrid 3 Days On-Site)

Employment Type: 6-Month Contract (Potential for extension)

Industry: Financial Services / Commercial Insurance Technology

Experience Level: Mid-Senior (6–10 Years)

Job Function: Software Engineering / Full-Stack Development

Visa Sponsorship / Relocation: Not Available (Local Candidates Only)

About the Role

We are seeking an experienced Senior Full-Stack MERN Developer for a 6-month hybrid contract engagement with a global enterprise insurance technology group in downtown Chicago.

In this role, you will design, develop, test, and deploy custom data analytics solutions and application modules. You will work across the full stack utilizing MongoDB, Express.js, React.js, Node.js, SQL, and AWS infrastructure, supporting complex data migrations and modern client-facing applications.

Key Responsibilities

• Full-Stack Engineering: Independently design, develop, code, test, and debug web applications and technical modules using the MERN stack (MongoDB, Express, React, Node) and relational SQL databases.
• Cloud & Infrastructure Maintenance: Deploy, manage, and maintain application environments on AWS infrastructure (utilizing EC2, S3, Lambda, RDS, and related services).
• Data & Analytics Integration: Support custom data analytics solutions, complex SQL database queries, data migrations, and application integration.
• DevOps & Version Control: Manage source code repositories using Git (branching, merging, PR reviews) while following established deployment and testing workflows.
• Technical Mentorship & Support: Serve as a senior technical resource and mentor for junior developers; assist with escalated tier-3 technical troubleshooting and root-cause resolution.
• AI & Modern Workflow Adoption: Leverage modern AI-driven developer tools and automated practices to optimize coding efficiency and accelerate feature delivery.

Must-Have Qualifications

• Experience: 6 to 10 years of professional full-stack web development experience with a heavy focus on the MERN stack (MongoDB, Express.js, React.js, Node.js).
• SQL & Database Mastery: Strong proficiency in SQL databases, including complex query writing, schema design, and data manipulation.
• Cloud Services: Hands-on experience deploying and managing applications on AWS cloud infrastructure.
• Version Control: Deep experience with Git version control and collaborative developer workflows.
• Engineering Best Practices: Proven expertise in software design patterns, unit testing, debugging, CI/CD, and documentation.
• Location & Work Model: Must reside locally in the Chicago metro area and be able to work 3 days/week on-site in downtown Chicago.

Preferred / Bonus Skills

• Experience within the Insurance, Commercial Claims, or Risk Management domain.
• Hands-on experience with TypeScript and modern containerization technologies (Docker, Kubernetes).
• Experience handling enterprise data migrations and custom analytics engine builds.