Full-Stack Software Engineering Intern

Who We Are

Lennox (NYSE: LII) Driven by 130 years of legacy, HVAC and refrigeration success, Lennox provides our residential and commercial customers with industry-leading climate-control solutions. At Lennox, we win as a team, aiming for excellence and delivering innovative, sustainable products and services. Our culture guides us and creates a workplace where all employees feel heard and welcomed. Lennox is a global community that values each team member's contributions and offers a supportive environment for career development. Come, stay, and grow with us.

What Drives Success

As an AI-Enabled Full Stack Software Engineering Intern, you will work across frontend development, backend services, data modeling, testing, and documentation activities. This is an excellent opportunity to gain experience with modern software engineering, AI-assisted development workflows, and enterprise-scale application modernization projects.

Successful interns will have the potential opportunity of joining Lennox Full-Time upon graduation. Relocation and/or travel may be required for your position.

Why You'll #LoveLennox:

• Impactful Projects: Work on meaningful assignments that drive real business results. Your ideas matter here.

• Intern Community: Connect with peers through social events, team-building activities, and engagement programs.

• Innovation Exposure: Dive into cutting-edge tech and trends shaping the HVAC and manufacturing industries.

• Learning and Development: Access workshops, training sessions, and resources to level up your skills and expand your knowledge.

• Competitive Pay and Relocation Support: Receive a competitive compensation package and relocation support if needed.

WHAT YOU'LL BE DOING

Full Stack Application Development

• Design, build, and refine production-quality web application features under the guidance of experienced software engineers.

• Develop frontend components and user experiences using Angular, TypeScript, HTML, and CSS.

• Build and enhance backend services using Java, Spring Boot, and REST APIs.

• Translate business requirements and user feedback into scalable software solutions.

AI-Enabled Software Delivery

• Support the development and validation of reusable AI skills, agents, scaffolding patterns, and iterative delivery workflows.

• Explore and improve AI-assisted development techniques to increase quality, speed, and repeatability.

• Assist in documenting and refining AI development practices for future project teams.

• Contribute to the creation of reusable playbooks, development standards, and delivery frameworks.

Application Modernization & Product Development

• Support modernization efforts for strategic enterprise applications, including the ADP Compass platform.

• Develop user-facing capabilities such as search functionality, configuration tools, optimization results, and comparison views.

• Assist in enhancing solution resiliency, performance, and maintainability.

• Participate in feature reviews, demonstrations, and sprint-based development activities.

Data & Domain Modeling

• Work with relational databases, data models, and application schemas.

• Support the creation and validation of data sets used for testing and solution verification.

• Assist in analyzing application outputs and ensuring alignment with business requirements.

• Collaborate with technical teams to improve data quality, performance, and reliability.

Quality Engineering & Continuous Improvement

• Create and execute unit, integration, and user interface tests.

• Develop test cases and support validation efforts to ensure software quality.

• Assist with debugging, troubleshooting, and defect resolution.

• Capture lessons learned and recommendations to improve future software delivery initiatives.

WHAT WE ARE LOOKING FOR

• Currently pursuing a Master's degree in Computer Science, Software Engineering, Computer Engineering, Information Technology, Management Information Systems, or a related technical field

• Experience with Java and Spring Boot or a comparable backend development framework

• Experience with Angular, TypeScript, HTML, and CSS

• Understanding of REST API design and integration principles

• Knowledge of SQL, relational database concepts, and data modeling

• Familiarity with Git and GitHub version control practices

• Strong analytical and problem-solving skills

• Ability to learn quickly, work through ambiguity, and adapt to changing priorities

• Strong written and verbal communication skills

• Ability to work effectively in a collaborative, cross-functional environment

Preferred Qualifications

• Experience with GitHub Copilot, Claude Code, AI coding assistants, agent workflows, or prompt engineering

• Understanding of reusable AI development patterns, skills, or MCP-based integrations

• Experience with automated testing frameworks such as JUnit, Playwright, Jest, Jasmine, or Karma

• Familiarity with Azure, AKS, CI/CD pipelines, containers, authentication, or observability tools

• Exposure to optimization algorithms, data modeling, or complex business domains

• Interest in large-scale data processing, performance tuning, and data-intensive applications

WHAT YOU'LL GAIN

• Hands-on experience developing enterprise-grade full stack applications

• Exposure to AI-enabled software engineering and emerging development practices

• Opportunities to work with experienced software engineers, architects, and technology leaders

• Experience building modern frontend and backend solutions using enterprise technologies

• Development of technical, analytical, testing, and solution delivery skills

• Insight into how AI can accelerate software development, improve quality, and transform engineering workflows

• Experience contributing to strategic modernization and digital transformation initiatives

This role offers a unique opportunity to work at the intersection of software engineering, artificial intelligence, and digital innovation while helping shape the future of AI-enabled application development within a global organization.

Requires a high school diploma or an equivalent combination of education and experience. Entry Level. Developing professional knowledge in the area of expertise. Solid written and verbal communication skills. Proficient in Microsoft Office.

What We Offer

Compensation: This is an hourly non-exempt role. The starting pay range for this role and market is between $22.50 – $25.00/hour. This rate is based on the intern's current year in their respective university programs. Graduate students may receive a higher rate of pay based on their year in school. Employees in this role are also eligible to earn overtime when they work more than 40 hours in a week (or as otherwise required by state law).

Our Culture: At Lennox, our Core Values of Integrity, Respect & Excellence are ingrained in the fabric of the organization. They define our culture – which is about how we do business and how we treat others. Lennox is not just a workplace; we are a global community that values each team member's contributions. As an equal opportunity employer, we are committed to recruit, develop, and retain talented individuals from a wide range of backgrounds, ensuring that everyone has the opportunity to succeed and contribute to our continued growth and success. At Lennox, you'll take pride in our brands, knowing you are part of something special. Come, stay, and grow with us!

Disclaimers: The compensation and benefits information is accurate as of the date of this posting. Lennox reserves the right to modify this information at any time, with or without notice, subject to applicable law.

We may use automated tools, including artificial intelligence, to support parts of our hiring process, such as application review and interview scheduling. These tools assist our teams but do not replace human decision-making. If you need an accommodation or have questions, please contact CandidateAccommodations@Lennox.com.