Nextroll Software Engineer Interview Questions + Guide in 2025

Nextroll is a leading marketing technology company that empowers businesses with innovative products to drive growth through data-driven marketing strategies.

As a Software Engineer at Nextroll, you will be an integral part of the Audiences & Identity team, collaborating closely with product managers and designers to create features that enhance customer engagement through advertising. Your responsibilities will include designing and shaping the architecture of evolving products, developing user interfaces and dashboards, and contributing to large-scale segmentation pipelines. You will be expected to have a strong foundation in programming languages such as JavaScript (React), Python, and Go, along with experience in building scalable systems and ETL pipelines.

Nextroll values teamwork and encourages engineers to take an active role in discussions about usability and user interaction, ensuring that every voice is heard in the development process. This position also involves mentoring junior engineers and tackling complex challenges in high-performance analytics, making it ideal for those who thrive in a collaborative, agile environment and are eager to learn and grow alongside their team.

This guide aims to equip you with the insights and knowledge necessary to excel in your interview for the Software Engineer role at Nextroll, helping you to align your skills and experiences with the company's mission and values.

The interview process for a Software Engineer at Nextroll is designed to assess both technical skills and cultural fit within the team. It typically consists of several stages, each aimed at evaluating different aspects of your capabilities and experiences.

1. Initial Phone Screen

The process begins with a phone screen, usually lasting around 30 minutes. During this call, a recruiter will discuss your background, the role, and Nextroll's culture. This is an opportunity for you to showcase your relevant experiences and express your interest in the position. The recruiter will also gauge your fit for the company and provide insights into what to expect in the subsequent stages.

2. Technical Assessment

Following the initial screen, candidates typically undergo a technical assessment, which may be conducted via a platform like CoderPad. This assessment usually involves solving coding problems that reflect real-world scenarios relevant to the role. Expect questions that test your proficiency in programming languages such as JavaScript (React), Python, and Go, as well as your understanding of databases and cloud services. The technical assessment is designed to evaluate your problem-solving skills and your ability to write clean, efficient code.

3. Onsite Interviews

The onsite interview consists of multiple rounds, typically five, each lasting about 45 minutes. These interviews are conducted by various team members and cover a range of topics, including system design, data manipulation, and case studies. You may also encounter behavioral questions that assess your teamwork and communication skills. The interviewers aim to create a conversational atmosphere, allowing you to engage with them as colleagues rather than feeling like you are being interrogated. This stage is crucial for demonstrating your technical expertise and your ability to collaborate effectively within a team.

4. Cultural Fit and Team Interaction

Throughout the interview process, Nextroll places a strong emphasis on cultural fit. Interviewers will be looking for candidates who align with the company's values and can contribute positively to the team dynamic. Expect discussions around your past experiences working in teams, how you handle challenges, and your approach to collaboration. This is also a chance for you to ask questions about the team culture and the work environment at Nextroll.

As you prepare for your interviews, consider the types of questions that may arise in each of these stages.

Here are some tips to help you excel in your interview.

Embrace the Collaborative Spirit

Nextroll values teamwork and collaboration, so approach your interviews as conversations rather than interrogations. Be prepared to discuss how you can contribute to a team environment, share your ideas openly, and engage with interviewers as if they were colleagues. Highlight experiences where you’ve successfully collaborated on projects, especially in agile settings, as this aligns with the company’s culture of treating engineers as equal partners in the development process.

Prepare for Technical Scenarios

Expect technical questions that are grounded in real business scenarios. Familiarize yourself with the types of problems you might encounter in the role, such as string parsing, data manipulation, and scalable system design. Practice articulating your thought process clearly, as interviewers appreciate candidates who can navigate through complex scenarios while staying focused on the business implications.

Showcase Your Full-Stack Expertise

As a software engineer at Nextroll, you’ll be expected to work across various technologies. Be ready to discuss your experience with programming languages like JavaScript (React), Python, and Go, as well as your familiarity with cloud services like AWS. Prepare examples that demonstrate your ability to design and implement features that enhance user experience, as this is a key aspect of the role.

Engage with Product and Design Perspectives

Since the role involves close collaboration with product managers and designers, be prepared to discuss how you approach user-centered design. Share your thoughts on usability and user interaction, and be ready to provide examples of how you’ve contributed to the design process in previous roles. This will show that you understand the importance of aligning technical solutions with customer needs.

Be Ready for a Mix of Questions

Expect a blend of technical and non-technical questions during your interviews. While technical proficiency is crucial, Nextroll also values cultural fit and interpersonal skills. Prepare to discuss your motivations, how you handle challenges, and your approach to problem-solving. This will help interviewers gauge not only your technical capabilities but also how well you align with the company’s values.

Follow Up with Insightful Questions

At the end of each interview, take the opportunity to ask thoughtful questions about the team dynamics, ongoing projects, and the company’s future direction. This not only demonstrates your interest in the role but also allows you to assess if Nextroll is the right fit for you. Consider asking about how the team measures success or how they incorporate feedback into their development process.

Stay Positive and Professional

While some candidates have reported less-than-ideal experiences with the recruitment process, maintaining a positive and professional demeanor throughout your interviews is essential. Be respectful and patient, and remember that the interviewers are also assessing how you handle challenges and setbacks. Your attitude can leave a lasting impression, regardless of the outcome.

By following these tips, you’ll be well-prepared to showcase your skills and fit for the Software Engineer role at Nextroll. Good luck!

In this section, we’ll review the various interview questions that might be asked during a software engineering interview at Nextroll. The interview process will likely focus on your technical skills, problem-solving abilities, and your experience working in collaborative environments. Be prepared to discuss your past projects, your approach to coding challenges, and how you can contribute to the team.

Technical Skills

1. Can you explain the differences between REST and GraphQL?

Understanding the nuances between these two API architectures is crucial for a software engineer at Nextroll, especially when working on customer-focused features.

How to Answer

Discuss the fundamental differences in how data is requested and delivered, and highlight the advantages and disadvantages of each approach.

Example

“REST APIs provide fixed endpoints for data retrieval, which can lead to over-fetching or under-fetching of data. In contrast, GraphQL allows clients to request exactly the data they need, which can optimize performance and reduce bandwidth usage. However, REST can be simpler to implement and cache, making it suitable for certain applications.”

2. Describe a challenging bug you encountered in a project and how you resolved it.

This question assesses your problem-solving skills and your ability to work under pressure.

How to Answer

Provide a specific example, detailing the steps you took to identify the bug, the tools you used, and how you ultimately resolved the issue.

Example

“In a recent project, I encountered a memory leak that caused the application to crash under heavy load. I used profiling tools to identify the source of the leak, which was a forgotten event listener. After removing it and optimizing the code, the application’s performance improved significantly.”

3. How do you ensure the quality of your code?

Quality assurance is vital in software development, especially in a collaborative environment.

How to Answer

Discuss your approach to writing clean, maintainable code, and the practices you follow to ensure quality, such as code reviews and testing.

Example

“I follow best practices like writing unit tests and conducting code reviews with my peers. I also use static analysis tools to catch potential issues early in the development process. This not only improves code quality but also fosters a culture of collaboration and learning within the team.”

4. What is your experience with cloud services, particularly AWS?

Given the emphasis on cloud technologies at Nextroll, familiarity with AWS is essential.

How to Answer

Share your experience with specific AWS services and how you have utilized them in past projects.

Example

“I have extensive experience with AWS, particularly with EC2 for hosting applications and S3 for storage. In my last project, I set up an auto-scaling group in EC2 to handle varying loads, which improved our application’s reliability and reduced costs.”

5. Can you explain how you would optimize a SQL query?

Optimizing database queries is a key skill for a software engineer, especially when dealing with large datasets.

How to Answer

Discuss the techniques you would use to analyze and improve query performance, such as indexing and query restructuring.

Example

“To optimize a SQL query, I would first analyze the execution plan to identify bottlenecks. I might add indexes to frequently queried columns and rewrite the query to reduce complexity. Additionally, I would ensure that I’m only selecting the necessary columns to minimize data retrieval time.”

Problem Solving

1. How would you approach designing a new feature for our advertising platform?

This question assesses your design thinking and ability to work collaboratively.

How to Answer

Outline your process for gathering requirements, brainstorming solutions, and iterating on designs.

Example

“I would start by collaborating with product managers and designers to gather requirements and understand user needs. Then, I would sketch out potential solutions and create prototypes for feedback. After iterating based on input, I would work on the implementation while ensuring that the feature aligns with our overall architecture.”

2. Describe a time when you had to learn a new technology quickly. How did you approach it?

This question evaluates your adaptability and willingness to learn.

How to Answer

Share a specific instance where you had to quickly get up to speed with a new technology and the steps you took to do so.

Example

“When I needed to learn React for a project, I dedicated time to go through the official documentation and completed several online tutorials. I also built a small project to apply what I learned, which helped solidify my understanding and allowed me to contribute effectively to the team.”

3. How do you prioritize tasks when working on multiple projects?

Time management is crucial in a fast-paced environment.

How to Answer

Discuss your approach to prioritization, including any tools or methodologies you use.

Example

“I prioritize tasks based on their impact and urgency, often using a Kanban board to visualize my workload. I also communicate regularly with my team to ensure alignment on priorities and deadlines, which helps us stay on track.”

4. Can you give an example of how you’ve worked in a team to solve a complex problem?

Collaboration is key at Nextroll, and this question assesses your teamwork skills.

How to Answer

Provide a specific example that highlights your role in the team and the outcome of your collaboration.

Example

“In a previous project, our team faced a significant performance issue. I organized a brainstorming session where we collectively analyzed the problem. By leveraging each member’s expertise, we identified the root cause and implemented a solution that improved performance by 40%.”

5. How would you handle a disagreement with a team member regarding a technical decision?

Conflict resolution is an important skill in any collaborative environment.

How to Answer

Discuss your approach to resolving disagreements constructively and maintaining a positive team dynamic.

Example

“I believe in addressing disagreements openly and respectfully. I would initiate a discussion to understand their perspective and present my reasoning. If we still disagreed, I would suggest involving a third party, such as a team lead, to help mediate and find a solution that aligns with our goals.”