Experienced Software Engineer: Backend, APIs & Cloud

Quantum Technologies LLC; Columbia (SC); On-site; USD 90,000 - 130,000; Full time

Job summary

Quantum Technologies. LLC in Columbia, SC is seeking an experienced Software Engineer to design, develop, test, and maintain scalable software applications.

The role spans frontend and backend tasks, including building RESTful APIs and microservices, with modern UI work in React.js, Angular, or Vue.js. You will design and optimize databases, implement security and authentication, and collaborate across product, QA, and operations teams while participating in CI/CD and Agile practices on cloud

Qualifications

• Experience with modern development frameworks and scalable software design.
• Strong programming skills and ability to build high‑performance applications.
• Experience with frontend and backend development, APIs and microservices.

Responsibilities

• Design, develop, and maintain scalable software applications.
• Develop backend services, APIs, and microservices architectures.
• Build responsive front-end applications using React.js, Angular, or Vue.js.
• Design and optimize relational and NoSQL databases.
• Develop and integrate RESTful APIs and third-party services.
• Implement application security, authentication, and authorization.
• Perform unit testing, integration testing, and debugging.
• Participate in code reviews and technical design discussions.
• Collaborate with product managers, QA engineers, and cross-functional teams.
• Troubleshoot production issues and improve application performance.
• Work with CI/CD pipelines and cloud platforms such as AWS, Azure, or GCP.
• Follow Agile/Scrum methodologies and participate in sprint planning.

Tools

HTML5

CSS3

React.js

Angular

REST APIs

GraphQL

JSON

JUnit

Selenium

Jest

Postman

Job description

Quantum Technologies. LLC in Columbia, SC is seeking an experienced Software Engineer to design, develop, test, and maintain scalable software applications.

The role spans frontend and backend tasks, including building RESTful APIs and microservices, with modern UI work in React.js, Angular, or Vue.js. You will design and optimize databases, implement security and authentication, and collaborate across product, QA, and operations teams while participating in CI/CD and Agile practices on cloud