A Software Engineer at Resideo plays a pivotal role in shaping the future of smart home technology, residential thermal comfort, and home security systems. As a company spun off from Honeywell, Resideo builds highly integrated hardware and software ecosystems that simplify home management for millions of users worldwide. In this role, you will write the software that connects physical devices—such as smart thermostats, water leak detectors, and security panels—to robust cloud platforms and intuitive consumer-facing applications.

The impact of your work in this position is immediate and highly visible. You will solve complex engineering challenges related to IoT scalability, low-latency data streaming, API development, and responsive user interfaces. Whether you are optimizing embedded logic, building robust backend microservices, or crafting front-end experiences in modern frameworks, your contributions directly impact home safety, energy efficiency, and peace of mind for global customers.

Candidates entering this role will find themselves working at the intersection of hardware and software. This requires a unique mindset that balances traditional software engineering principles with an understanding of physical device constraints and cloud connectivity. It is a highly collaborative environment where you will work alongside product managers, hardware engineers, and systems architects to deliver seamless, end-to-end user experiences.

The following questions are representative of what candidates face during the Resideo hiring process, compiled from real reported interview experiences across global offices. Because Resideo recruits for a wide range of teams—from embedded systems to web platforms—the questions you encounter will be tailored to your specific domain, but they consistently follow these core thematic patterns.

Technical & Core Programming

• Explain the difference between interface-based programming and inheritance in Java or C++. How do you decide which to use?
• How does memory management differ between a compiled language like C and a managed language like Python or Java?
• Write a function to reverse a linked list, both iteratively and recursively, and explain the space complexity of both approaches.

Successful preparation for the Resideo interview process requires a balanced approach. You must demonstrate strong fundamental computer science knowledge while highlighting your practical, hands-on development experience.

Role-Related Knowledge – You must show a deep understanding of the language and stack specified in your target job description. If you are applying for a front-end position, expect deep dives into React and TypeScript. For backend or embedded roles, be prepared to discuss C/C++, Java, or Python, along with core database design.

Problem-Solving & Logic – Interviewers want to see how you break down complex, multi-layered problems. You should practice verbalizing your thought process during coding exercises, showing how you move from a brute-force approach to an optimized, clean solution under time constraints.

Agile & Collaboration Mindset – Because Resideo operates on cross-functional product teams, you will be evaluated on your familiarity with Agile and Scrum methodologies. Be prepared to discuss how you collaborate with non-technical stakeholders, manage your sprint tasks, and handle shifting project priorities.

The interview process at Resideo is structured to evaluate both your theoretical foundations and your practical execution capabilities. While the exact steps can vary slightly depending on the office location and the seniority of the role, the sequence generally follows a standard progression designed to test technical depth and cultural alignment.

The journey typically begins with an initial recruiter phone screen to discuss your background, career goals, and basic alignment with the role. Following this, candidates are usually invited to complete an online technical assessment. This assessment is highly focused on core computer science concepts, including data structures, logic, and basic mathematical aptitude.

If you pass the initial screening phases, you will move on to more intensive technical rounds. These include deep-dive coding sessions, system design discussions, and resume-based conversations where you will walk through your past projects in detail. Depending on the location and team, you may also participate in a collaborative hackathon or be asked to complete a take-home coding challenge to showcase your practical implementation skills.

The visual timeline above outlines the typical progression a candidate goes through during the Resideo hiring cycle. You should interpret this timeline as a guide to pace your preparation, focusing first on algorithmic fundamentals and language-specific syntax, before transitioning to system design and behavioral scenarios. Note that some international locations may combine or add rounds, such as on-site manager panel interviews or localized technical assessments.

To excel in the Resideo interview process, you must understand the specific areas where interviewers focus their evaluation. The technical rounds are designed to test your coding efficiency, architectural thinking, and your ability to work within structured development frameworks.

Algorithmic Logic & Core Coding

This area evaluates your ability to write clean, efficient, and bug-free code under a time limit. Interviews frequently leverage platforms like HackerRank to test your understanding of data structures and your ability to implement logical solutions to medium-difficulty problems.

Be ready to go over:

• Data Structures – Thorough knowledge of arrays, linked lists, trees, hash maps, and graphs.
• Algorithm Optimization – Analyzing and improving the time and space complexity (Big O notation) of your code.
• Aptitude & Math – Core logical reasoning, basic probability, and mathematical problem-solving often integrated into the initial written tests.
• Advanced concepts (less common) – Dynamic programming, complex graph traversal algorithms, and bit manipulation.

Example questions or scenarios:

• "Given an array of integers, find the contiguous subarray that has the largest sum and return its sum."
• "Implement an algorithm to detect a cycle in a directed graph."
• "Write a program to find the shortest path between two nodes in a network representing connected smart home devices."

Object-Oriented Design & Frameworks

For software engineering roles, Resideo looks for strong software engineering discipline, focusing on clean code, modular design, and appropriate use of modern frameworks.

Be ready to go over:

• OOP Principles – Solid understanding of encapsulation, inheritance, polymorphism, and abstraction.
• Design Patterns – Practical applications of patterns like Singleton, Factory, Observer, and Decorator.
• Frontend/Backend Stacks – Deep domain knowledge in frameworks like React and TypeScript for web roles, or Java and Python for backend services.
• Advanced concepts (less common) – Microservices architecture, API gateway design, and state management at scale.

Example questions or scenarios:

• "Design the class structure for a home security system that manages different types of sensors (motion, door, smoke)."
• "How would you design a reusable component library in React that maintains consistent styling and state across different applications?"
• "Explain how you would implement dependency injection in a backend application to improve testability."

Project Walkthroughs & Agile Practices

This area focuses on how you apply your technical skills in real-world team environments. Interviewers will dive deep into your resume, asking you to explain the architectural decisions, trade-offs, and methodologies used in your past projects.

Be ready to go over:

• System Architecture – Explaining the end-to-end flow of a system you built, including data storage, APIs, and client interactions.
• Agile & Scrum – Your understanding of sprint cycles, backlog grooming, retrospectives, and cross-functional collaboration.
• Testing & Quality Assurance – Your approach to unit testing, integration testing, and maintaining code quality.

Example questions or scenarios:

• "Walk me through the architecture of the most complex system you have worked on. What were the main bottlenecks, and how did you resolve them?"
• "Describe a scenario where a feature deployment failed in production. How did you identify the issue, roll back, and prevent it from happening again?"
• "How do you estimate the effort required for a user story during sprint planning when there are significant technical unknowns?"

As a Software Engineer at Resideo, your daily work will span the entire software development lifecycle. You will be responsible for translating product requirements into robust, maintainable, and scalable technical solutions.

On a day-to-day basis, you will collaborate closely with product managers to refine user stories, write clean and well-documented code, and participate in peer code reviews to maintain high quality standards. You will also work alongside hardware and firmware teams to ensure seamless integration between physical smart home devices and cloud APIs.

Additionally, you will be expected to actively participate in your team's Agile processes. This includes contributing to daily stand-ups, sprint planning sessions, and retrospectives. Depending on your seniority, you may also mentor junior developers, drive architectural decisions, and lead initiatives to modernize existing codebases and deployment pipelines.

To be competitive for a Software Engineer position at Resideo, you should possess a strong foundation in computer science combined with practical, real-world development experience.

Technical Requirements

• Strong proficiency in at least one major programming language such as Java, C++, Python, or JavaScript/TypeScript.
• Solid understanding of data structures, algorithms, and object-oriented programming design principles.
• Experience working with relational databases like MySQL or PostgreSQL, including writing optimized queries.
• Familiarity with modern web development frameworks, particularly React and Node.js, for full-stack and frontend positions.
• Understanding of cloud services (AWS or Azure) and containerization tools like Docker is highly desirable.

Experience & Soft Skills

• A Bachelor's or Master's degree in Computer Science, Software Engineering, or a related technical discipline, or equivalent practical experience.
• Proven experience working within an Agile/Scrum software development environment.
• Strong communication skills, with the ability to clearly explain technical concepts to both technical and non-technical team members.
• A proactive, problem-solving mindset with a strong sense of ownership over your deliverables.