Fullstack Integration Engineer

System One • Virginia, Virginia • 9h ago

Senior Full-Stack Integration Engineer

Location: Remote - United States

Experience: 5+ years of professional software engineering experience

We are seeking a Senior Full-Stack Integration Engineer to design, build, and support cloud-based applications, APIs, and external partner integrations. This position is best suited for a backend-leaning full-stack engineer with strong experience in Node.js, TypeScript, React, AWS, and production database environments.

The ideal candidate will have hands-on experience developing partner-facing APIs, integrating third-party systems, and building reliable cloud services used by external customers and business partners.

Responsibilities

Design, develop, test, and maintain backend services using Node.js and TypeScript

Build and enhance frontend application features using React and TypeScript

Design and develop REST and/or GraphQL APIs for use by external partners

Integrate applications with third-party platforms, vendors, and partner systems

Build and operate cloud-based services within AWS

Develop serverless applications using services such as AWS Lambda and API Gateway

Design and maintain production data models using relational or document databases

Collaborate with product, engineering, and external partner teams to define integration requirements

Troubleshoot API, data, and integration issues across distributed systems

Participate in code reviews, testing, deployment, and ongoing application support

Help establish scalable development practices for partner integrations and cloud services

Required Qualifications

5+ years of professional software engineering experience

Strong backend development experience with Node.js

Advanced TypeScript experience across backend and frontend applications

Professional frontend development experience using React

Production experience with a relational or document database, preferably PostgreSQL or MongoDB

Experience building and operating applications or services within AWS

Hands-on experience integrating with third-party or external partner systems

Experience designing and developing externally consumed REST and/or GraphQL APIs

Strong understanding of API security, authentication, error handling, and data validation

Ability to work effectively in a remote, collaborative engineering environment

Preferred Qualifications

Experience with NestJS

Production experience with MongoDB

Experience developing GraphQL APIs

Experience with AWS serverless technologies, including Lambda and API Gateway

Previous government or public-sector delivery experience

Experience supporting applications with multiple external partner integrations

Familiarity with automated testing, CI/CD pipelines, monitoring, and production support

This is a remote opportunity available to candidates located within the United States.

System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.

M1

LI-CS1

Ref: #851-Rockville-S1

System One, and its subsidiaries including Joulé, ALTA IT Services, CM Access, TPGS, and MOUNTAIN, LTD., are leaders in delivering workforce solutions and integrated services across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible full-time employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

Similar Jobs

Software Development Engineer

CVS Health • West Virginia, West Virginia • 49min ago

IT & Engineering

We're building a world of health around every individual - shaping a more connected, convenient and compassionate health experience. At CVS Health®, you'll be surrounded by passionate colleagues who care deeply, innovate...

49min ago

Go to Apply

Software Development Engineer

CVS Health • California, California • 49min ago

IT & Engineering

49min ago

Go to Apply

Software Development Engineer

CVS Health • Michigan, Michigan • 53min ago

IT & Engineering

53min ago

Go to Apply

Software Development Engineer

CVS Health • Virginia, Virginia • 54min ago

IT & Engineering

54min ago

Go to Apply

Web & Mobile Content Developer

System One • Virginia, Virginia • 9h ago

IT & Engineering

Job Title: Web & Mobile Content Developer Location: Vienna, VA Work Schedule: hybrid, onsite 3 days per week and remote 2 days per week Pay Rate: W2 only Position Type: Multiyear Contract Senior Web Content & Sea...

9h ago

Go to Apply