Senior Full Stack Engineer (Contract)

NextSource Inc.; United States; Remote; USD 110,000 - 124,000; Full time

Benefits offered by this job

Healthcare Benefits including Medical,

Prescription, Vision & Dental Coverage

401(k) Retirement Planning

Discount Program

Job summary

nextSource is seeking a Senior Full Stack Software Engineer to design, build, and modernize user-facing applications on AWS. You will deliver full-stack features with React and Node in a serverless environment, and drive automation and framework improvements across the team.

The role requires strong JS, Node.js, and React expertise, plus deep AWS serverless knowledge. You will collaborate remotely with cross-team partners and contribute early in projects.

Qualifications

• Minimum 7 years of professional software development experience.
• Strong hands-on JavaScript (ES6).
• Strong hands-on Node.js development, meaning real coding depth rather than package management alone.
• Strong hands-on React.js.
• Deep working knowledge of AWS serverless architecture: Lambda, S3, SNS/SQS, Kinesis, RDS, and DynamoDB.
• Experience with both relational and NoSQL databases.
• Experience designing, building, and monitoring microservices.
• Hands-on CI/CD experience with Jenkins or AWS CodePipeline.
• Strong unit testing discipline plus automated API integration testing.
• Working experience with automated device and browser testing.
• Strong fundamentals in object-oriented design and core computer science principles.
• Knowledge of systems analysis and design (OOAD, UML) and database design.
• Solid grasp of SDLC and modern software engineering practices.
• Ability to code alongside agentic AI tools as part of your normal workflow.

Responsibilities

• Design, develop, and ship full-stack features across React front ends and Node.js services.
• Build serverless solutions on AWS that support data quality, process automation, and data integrity at scale.
• Own complex development work and manage defined sections of ongoing projects against firm deadlines.
• Create design specifications, unit tests, and technical documentation.
• Build and monitor microservices, applying distributed design patterns where they fit.
• Improve automation and testing frameworks alongside feature delivery.
• Work directly with cross-team partners and internal customers, keeping those relationships professional and predictable.

Skills

JavaScript (ES6)

Node.js

React.js

AWS serverless

Relational & NoSQL databases

Microservices design

CI/CD (Jenkins / CodePipeline)

Unit testing & API integration testing

Automated device/browser testing

OO design fundamentals

OOAD/UML & database design

SDLC & modern software practices

Agentic AI tools integration

Tools

AWS

Jenkins

AWS CodePipeline

GitHub CI/CD

Serverless framework

Job description

Senior Full Stack Software Engineer

Remote (Central or Eastern time zone) | Long term contract

We are hiring a Senior Full Stack Software Engineer to build and modernize external, user-facing applications on AWS. The work spans new product development and the redesign of legacy systems into modern React and Node applications on serverless infrastructure. Teams here operate in a poly-skilled way, so core feature development sits alongside automation work and ongoing improvements to the frameworks the team tests against.

This role fits an engineer who can operate with minimal guidance, communicate clearly in a remote setting, and start contributing early.

What you will do

• Design, develop, and ship full-stack features across React front ends and Node.js services
• Build serverless solutions on AWS that support data quality, process automation, and data integrity at scale
• Own complex development work and manage defined sections of ongoing projects against firm deadlines
• Create design specifications, unit tests, and technical documentation
• Build and monitor microservices, applying distributed design patterns where they fit
• Improve automation and testing frameworks alongside feature delivery
• Work directly with cross-team partners and internal customers, keeping those relationships professional and predictable

Required qualifications

• Minimum 7 years of professional software development experience
• Strong hands-on JavaScript (ES6)
• Strong hands-on Node.js development, meaning real coding depth rather than package management alone
• Strong hands-on React.js
• Deep working knowledge of AWS serverless architecture: Lambda, S3, SNS/SQS, Kinesis, RDS, and DynamoDB
• Experience with both relational and NoSQL databases
• Experience designing, building, and monitoring microservices
• Hands-on CI/CD experience with Jenkins or AWS CodePipeline
• Strong unit testing discipline plus automated API integration testing
• Working experience with automated device and browser testing
• Strong fundamentals in object-oriented design and core computer science principles
• Knowledge of systems analysis and design (OOAD, UML) and database design
• Solid grasp of SDLC and modern software engineering practices
• Ability to code alongside agentic AI tools as part of your normal workflow

Preferred qualifications

• Event-driven architecture and stream processing patterns
• Hands-on use of agentic AI or LLM-based tooling (Claude, Copilot, LangChain, or similar) for development acceleration and automation
• Infrastructure as code (AWS CloudFormation, CDK, or similar)
• Fluency with KMS, ALB/ELB, Route 53, and VPC
• GitHub-based CI/CD workflows
• Background in high-frequency data monitoring or tooling
• Agile and Scrum experience with a collaborative, team-first approach
• Exposure to Java or Python as an addition to strong React and Node depth
• Relevant AWS or professional certifications

Pay Rate Range: $80-$90 per hr (Depending on Experience)

nextSource is proud to be an Equal Employment Opportunity and Affam…

We do not discriminate based upon race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, veteran status, marital status, parental status, cultural background, organizational level, work styles, tenure, and life experiences or for any other reason.

nextSource is committed to providing reasonable accommodation for qualified individuals with disabilities in our job application procedures. If you need assistance or accommodation due to a disability, you may contact us at

What nextSource Provides:

• Healthcare Benefits including Medical, Prescription, Vision & Dental Coverage | United Healthcare
• Voluntary STD & LTD | New York Life
• 401(k) Retirement Planning | Fidelity
• Discount Program

*You are Eligible to participate in the benefits program if you are considered a full-time employee of nextSource, working at least 30 hours per week on a consistent basis. Your coverage will be effective on the 1st of the month following 60 days of employment.