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

UKG•Lowell, MA

13d•$102,300 - $147,050

About The Position

We are looking for a Software Engineer III - Eng to join our dynamic Payroll team. This senior full stack role provides an opportunity to lead projects and contribute to high-impact software solutions used by enterprises and users worldwide. You will be responsible for the design, development, testing, deployment, and maintenance of complex web applications across the front end, backend, and database layers. You will also mentor junior engineers and contribute to the technical foundation of our flagship products and services.

Requirements

Bachelor’s degree in computer science, engineering, or a related technical field, or equivalent practical experience.
Minimum of five years of professional software development experience.
Strong experience building full stack web applications.
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).
Excellent communication and interpersonal skills.

Nice To Haves

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.
Knowledge of Agile development methodologies.
Familiarity with developing accessible and internationalized web applications.
Familiarity with AI spec-driven development (Spec Kit).
Experience mentoring engineers or providing technical leadership.
Dedication to supporting diversity and inclusion initiatives.

Responsibilities

Write clean, maintainable, test and efficient code across React and TypeScript user interfaces, Java services and REST APIs, and database components.
Contribute to the design, development, and deployment of complex software applications while ensuring high standards of quality and performance.
Manage the execution and delivery of features and projects, negotiate priorities and deadlines, and ensure timely, high-quality completion.
Participate in design reviews and the architectural design of front-end, backend, and data solutions while ensuring scalability, reliability, and maintainability.
Review code from other developers, provide feedback, and maintain a high bar for technical excellence, maintainability, observability, and automated 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.
Maintain the health and quality of applications and services, proactively identify and resolve issues, and use telemetry to optimize performance and prevent recurring incidents.
Take ownership from requirements and design through development, testing, deployment, monitoring, and production support.
Document new features, enhancements, and fixes, contribute to training materials, and share knowledge with the team.
Work with engineers, Product Management, UX, and external teams to ensure the integrity and quality of the complete solution.