Fullstack Integration Engineer

• 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

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., * 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, * 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

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.

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.