Demo

Lead Application Developer (MERN)

Vertex Solutions Inc.
Princeton, NJ Contractor
POSTED ON 5/19/2026
AVAILABLE BEFORE 6/17/2026

Lead Applications Developer needed for a 6 month contract role HYBRID to Princeton NJ 3 days a week. Must have MERN stack (MongoDB, Express, React, Node) expertise and AI development is a plus.


Only direct W2 candidates - NO candidates from 3rd parties will be considered


Looking for a Lead Applications Developer. You will be responsible for application development of key systems on the new modern technology stack while focusing on quality code, automation and best practices.


WHAT YOU CAN EXPECT?

Lead Applications Developer is responsible for developing complex custom software solutions


In this role you will:

Conduct Code reviews

Implement business logic from business requirements and design specification

Development of key systems using new open-source technology stack

Focus on quality code, automation and good practices

Contribute to and be part of the Development Center of Excellence in driving up the quality and value of software development and delivery across the enterprise

Proactively contribute to our system architecture and stack design, toolset, agile and DevOps approach

Collaborate closely with Agile Dev team members, Product Owners and business users to deliver business value

Develop and test software solutions and review code quality

Automate build, test (unit, functional and performance) and deployment of the code part of the CI/CD pipeline by working closely with Platform Engineer


We will count on you to:

Perform code reviews

Lead Applications Developer owns the design of the application and is responsible for the implementation with the development team and ensure the design is properly incorporated into the deliverables

Act as technical design authority collaborating with the solution architect to implement the solution

Provide application design feedback to the project team on an ongoing basis

Review detailed design, code deliverables, and ensure quality

Assist the Enterprise architects in defining, implementing and overseeing technical standards, policies and tools

Provide technical oversight to development teams. Work with technical staff to understand problems with software and develop specifications to resolve them.

Responsible for effective application development including integration with other Guy Carpenter systems.

Responsible for operational effectiveness of the environment; adhere to Guy Carpenter Process Framework.

Proactively contribute to our system architecture and stack design, toolset, agile and DevOps approach

Collaborate closely with Dev team members, Product Owners and business users to deliver business value

Automate build, test (unit, functional, security vulnerability and performance) and deployment of the code part of the CI/CD pipeline by working closely with System Engineer

Mentor developers on both technical topics and with Agile/DevOps adoption

Estimate Development efforts for new initiatives; help define and build Development teams by working with stakeholders


What you need to have:

A degree in Computer Science or related field or have relevant experience

5 years of development experience in applications/product development using MEAN/MERN Stack


Must have experience or working knowledge of:

JavaScript, TypeScript, JSON, XML, HTML, SASS/LESS/CSS

Web platforms such as NODE, Angular, React, MEAN/MERN Stack

Microservices, Micro frontend Architecture, API Management (Apigee)

REST API first design and Open API Specification, specifically using Swagger

Agile – TDD (Junit, Mockito, Jasmine, Karma) BDD (Cucumber) Pair Programming, Scrum/Kanban

DevOps – GitHub, Git Actions, Azure DevOps, CI/CD pipelines, Selenium, Artifactory, Docker/Kubernetes, Datadog/Splunk, JMeter, Whitehat

Databases: MongoDB, PostgreSQL, SQL Server

Cloud – Azure, Private Cloud

OS – Linux, VM Architectures

Will be a plus if experience includes:

Have developed backend services using NestJS


Vertex Solutions Inc. is an Equal Opportunity Employer and does not discriminate on the basis of race, color, creed, national origin, ancestry, religion, age, citizenship, sex, marital or veteran status, disability or handicap, sexual orientation or any other basis prohibited by applicable law.

Hourly Wage Estimation for Lead Application Developer (MERN) in Princeton, NJ
$73.00 to $92.00
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