What is a Software Engineer at A. O. Smith?

As a Software Engineer at A. O. Smith, you are stepping into a critical role at one of the world's leading manufacturers of residential and commercial water heating equipment and water treatment products. Software engineering here is not just about building isolated applications; it is about bridging the gap between digital innovation and physical hardware. Your work directly impacts the efficiency, sustainability, and user experience of products relied upon by millions globally.

In this position, you will be tackling complex challenges at the intersection of IoT (Internet of Things), cloud connectivity, and enterprise manufacturing systems. Whether you are developing smart-home integrations for the iCOMM™ platform, building internal tools to support continuous improvement on the factory floor, or writing firmware for next-generation water heaters, your code will have a tangible, real-world footprint.

You will frequently collaborate with cross-functional teams—including Thermal Mechanical Engineers, Quality Engineers, and Manufacturing Project Engineers across key hubs like Milwaukee, WI, and Ashland City, TN. This role requires a unique blend of traditional software engineering rigor and an appreciation for hardware reliability. If you are passionate about building scalable software that powers sustainable, physical products, this role offers an exceptional platform for your skills.

Common Interview Questions

Getting Ready for Your Interviews

Preparing for an interview at A. O. Smith requires a balanced approach. You must demonstrate strong technical fundamentals while showing that you can thrive in a highly collaborative, manufacturing-adjacent environment.

Expect your interviewers to evaluate you against the following core criteria:

Technical Execution and Architecture Your interviewers need to know you can write clean, maintainable, and scalable code. For A. O. Smith, this also means understanding how software interacts with hardware, cloud infrastructure, and potentially constrained embedded environments. You can demonstrate strength here by emphasizing reliability, security, and edge-case handling in your technical answers.

Cross-Functional Problem Solving Because you will be working alongside mechanical, electrical, and manufacturing engineers, you must be able to translate complex software concepts to non-software stakeholders. Interviewers will look for your ability to structure ambiguous challenges, gather requirements from diverse teams, and deliver pragmatic solutions.

Focus on Quality and Continuous Improvement A. O. Smith has a deep-rooted culture of manufacturing excellence and quality assurance. You will be evaluated on your approach to testing, CI/CD pipelines, and how you monitor software performance post-deployment. Highlighting your commitment to robust testing methodologies will strongly signal your alignment with their engineering values.

Adaptability and Culture Fit The company values integrity, innovation, and teamwork. Interviewers will assess how you navigate setbacks, handle shifting project requirements, and contribute to a positive, safety-conscious team culture.

Interview Process Overview

The interview process for a Software Engineer at A. O. Smith is designed to be thorough but practical. Unlike hyper-growth tech startups that might rely on obscure algorithmic puzzles, A. O. Smith grounds its technical evaluations in real-world scenarios relevant to their product lines. The process moves at a steady pace, usually spanning three to four weeks from the initial conversation to the final decision.

You will typically begin with a recruiter screen to discuss your background, location preferences (such as Milwaukee, WI, or Johnson City, TN), and high-level technical experience. This is followed by a technical screening with a hiring manager or senior engineer, which often involves discussing your past projects, architecture decisions, and a light coding or technical Q&A session.

The final stage is a comprehensive panel interview. This is usually conducted virtually or onsite and consists of multiple sessions covering system design, deep-dive coding, and behavioral/leadership principles. You will likely meet with engineers from adjacent disciplines, reflecting the company's highly collaborative environment.

This visual timeline outlines the typical stages you will progress through during the A. O. Smith interview loop. Use this to structure your preparation, focusing first on high-level resume narrative for the recruiter screen, and then diving deep into system architecture and coding practice for the technical rounds. Keep in mind that for specialized roles (like IoT or embedded software), the technical screen may heavily feature domain-specific questions.

Deep Dive into Evaluation Areas

To succeed, you need to understand exactly what the engineering team is looking for across different competencies. Here is a breakdown of the primary evaluation areas.

Software Architecture and System Design

For A. O. Smith, system design is heavily skewed toward IoT connectivity, telemetry data ingestion, and enterprise software scalability. Interviewers want to see that you can design systems that handle intermittent connectivity, secure data transfer, and large volumes of sensor data.

Be ready to go over:

• Data Ingestion pipelines – How to handle high-throughput telemetry data from thousands of connected water heaters.
• API Design – Creating robust, versioned APIs for mobile apps or third-party smart home integrations.
• Security and Authentication – Securing device-to-cloud communications and managing user access.
• Advanced concepts (less common) – Edge computing logic, MQTT protocol specifics, and real-time anomaly detection in hardware.

Example questions or scenarios:

• "Design a cloud architecture to ingest, store, and analyze temperature and usage data from 100,000 smart water heaters."
• "How would you handle firmware over-the-air (OTA) updates for devices that frequently lose Wi-Fi connectivity?"
• "Walk us through how you would secure an API endpoint used by our mobile application to control a user's boiler."

Coding and Algorithmic Problem Solving

While you will face coding challenges, A. O. Smith typically focuses on practical application over abstract theoretical problems. The goal is to see how you structure your code, name your variables, and handle edge cases.

Be ready to go over:

• Data Structures – Practical use of hash maps, queues, and trees for data processing.
• Object-Oriented Design – Structuring classes and interfaces for maintainability.
• Concurrency and Multithreading – Handling asynchronous tasks, especially relevant for hardware communication or background data processing.
• Advanced concepts (less common) – Low-level memory management (if applying for an embedded-leaning software role).

Example questions or scenarios:

• "Write a function to parse a continuous stream of sensor data and trigger an alert if the temperature exceeds a specific threshold for three consecutive readings."
• "Implement a rate limiter for an internal API used by our manufacturing execution system."
• "Refactor this block of legacy code to improve its time complexity and readability."

Cross-Functional Collaboration and Behavioral

Because you will interface with diverse engineering disciplines (like Thermal Mechanical and Materials Engineering), your ability to communicate effectively is paramount. The behavioral interview focuses heavily on your past experiences working in multidisciplinary teams.

Be ready to go over:

• Conflict Resolution – How you handle disagreements on technical direction with non-software stakeholders.
• Project Ownership – Examples of taking a feature from conception to deployment.
• Adaptability – How you pivot when hardware limitations force a change in software design.

Example questions or scenarios:

• "Tell me about a time you had to explain a complex software limitation to a hardware or manufacturing engineer."
• "Describe a situation where a project's requirements changed abruptly. How did you handle it?"
• "Give an example of a time you discovered a critical bug right before a major release. What steps did you take?"