Software Engineer III- Eng (Full Stack Java/React)

UKG; Lowell (MA); On-site; USD 120,000 - 180,000; Full time

Job summary

UKG in Lowell, MA is seeking an experienced Senior Software Engineer to contribute across front-end, back-end, and data layers. You will write clean, scalable code in React/TypeScript and Java, design REST APIs, and collaborate with product and UX teams to deliver impactful software.

You will own features end-to-end, implement tests with tools like JUnit and Selenium, and help maintain system health with telemetry and CI/CD practices.

Qualifications

• Bachelor's degree or equivalent practical experience in CS or engineering.
• 6+ years of professional software development experience.
• Strong proficiency in Java, React/TypeScript, and SQL.
• Experience building REST APIs and integrating with front-end apps.
• Experience with SQL and NoSQL databases.
• Knowledge of cloud platforms and DevOps principles.

Responsibilities

• Develop and maintain full-stack applications across front-end, back-end, and data components.
• Lead design reviews and ensure scalable, reliable software.
• Manage feature delivery, priorities, and deadlines.
• Write automated tests (unit, integration, API, E2E).
• Maintain service health using telemetry and proactive monitoring.
• Collaborate with product, UX, and external teams to ensure quality.

Skills

Java

React/TypeScript

SQL

REST APIs

GitHub/Jira

Cloud & DevOps

Education

Bachelor's degree in CS/Engineering or equivalent

Tools

GitHub

Jira

CI/CD tools (Jenkins/TeamCity/GH Actions)

Selenium/Cucumber

Job description

Responsibilities

• Full Stack Development: Write clean, maintainable, test and efficient code across React and TypeScript user interfaces, Java services and REST APIs, and database components.
• Technical Leadership: Contribute to the design, development, and deployment of complex software applications while ensuring high standards of quality and performance.
• Project Management: Manage the execution and delivery of features and projects, negotiate priorities and deadlines, and ensure timely, high-quality completion.
• Architectural Design: Participate in design reviews and the architectural design of front-end, backend, and data solutions while ensuring scalability, reliability, and maintainability.
• Code Review: Review code from other developers, provide feedback, and maintain a high bar for technical excellence, maintainability, observability, and automated testing.
• Testing: Build testable software and automate unit, integration, API, and end-to-end tests using tools such as JUnit, React Testing Library, Cucumber, or Selenium.
• Service Health and Quality: Maintain the health and quality of applications and services, proactively identify and resolve issues, and use telemetry to optimize performance and prevent recurring incidents.
• DevOps Model: Take ownership from requirements and design through development, testing, deployment, monitoring, and production support.
• Documentation: Document new features, enhancements, and fixes, contribute to training materials, and share knowledge with the team.
• Collaboration: Work with engineers, Product Management, UX, and external teams to ensure the integrity and quality of the complete solution.

Requirements

• Bachelor's degree in computer science, engineering, or a related technical field, or equivalent practical experience.
• Minimum of six years of professional software development experience.
• Strong proficiency in Java, React/TypeScript and SQL.
• Experience developing REST APIs and integrating them with front-end applications.
• Demonstrated experience working with SQL and NoSQL databases.
• Extensive knowledge of software development practices and design patterns.
• Experience leveraging AI tools in software development (Claude, Copilot or Windsurf).
• Proficiency with version control systems such as GitHub and work-tracking systems such as Jira.
• Solid understanding of cloud technologies and DevOps principles.
• Experience with automated unit, integration, and end-to-end testing (JUnit, React Testing Library, Selenium, Cucumber).
• Experience with Azure, AWS, or Google Cloud Platform.
• Familiarity with CI/CD tools such as Jenkins, TeamCity or GitHub Actions.
• Experience with front-end, backend, and API test automation tools.
• Familiarity with developing accessible and internationalized web applications.
• Familiarity with AI spec-driven development (Spec Kit).
• Dedication to supporting diversity and inclusion initiatives.