Senior Backend Engineer - job 1 of 2

The Senior Backend Engineer at PayPay will primarily focus on designing large scale systems that support our high throughput applications. This role involves developing tools, participating in code reviews, and providing technical guidance to team members. Additionally, the engineer will work on optimizing performance and ensuring that the applications are scalable and fast. Collaborating with product managers and other stakeholders to gather requirements and deliver features on time is also essential.

To qualify for the Senior Backend Engineer position at PayPay, candidates should possess excellent skills in Java or another similar programming language, such as Scala or Python. Strong knowledge of SQL and NoSQL databases, as well as experience with microservices and designing high traffic systems, are crucial. A degree in Computer Engineering or Computer Science or equivalent experience in SaaS platform development is also required, along with proficiency in English or Japanese.

The Senior Backend Engineer position at PayPay makes use of a diverse tech stack including Java, Kotlin, and Scala. Frameworks such as Spring Boot and tools like Docker, Kubernetes, and AWS are essential components of our infrastructure. Additionally, experience with data handling technologies like MySQL, DynamoDB, and Kafka will be valuable in this role.

Yes! The Senior Backend Engineer position at PayPay offers a flexible Work From Anywhere arrangement. You can enjoy the freedom of working remotely while being part of an innovative team that thrives on collaboration across different time zones.

At PayPay, the work culture emphasizes collaboration, innovation, and a problem-solving mindset. We believe in embracing challenges and maintaining high standards of quality in our work. Our team encourages members to be proactive in identifying performance improvements, sharing knowledge, and contributing to open-source projects when possible.

PayPay provides a robust benefits package for Senior Backend Engineers, including social insurance (health, employment, and pension), a 401K plan, and various paid leave options. Additionally, there are allowances for remote work and opportunities for professional growth through our supportive work environment.

A Senior Backend Engineer at PayPay plays a crucial role in enhancing the payment system's performance, scalability, and security. By designing effective solutions and collaborating closely with product managers, your expertise will directly contribute to improving customer experience and supporting PayPay's remarkable growth in the FinTech industry.

When answering this question, share specific examples of systems you've designed or worked on that managed high traffic. Highlight your understanding of load balancing, distributed computing, and any metrics you used to measure performance. Emphasize your problem-solving approach when challenges arose.

Discuss your strengths in programming languages like Java or Kotlin. Explain why you're passionate about them, including specific projects that showcase your skills. It's also beneficial to mention your willingness to learn new languages, aligning with PayPay's emphasis on continuous learning.

Be prepared to discuss various techniques such as optimizing algorithms, implementing caching strategies, and profiling applications to identify bottlenecks. Mention any tools you’ve used to monitor performance and how your optimizations benefited past projects.

Describe your philosophy on code reviews, focusing on collaboration and learning. Explain how you provide constructive feedback and support team members in improving code quality while maintaining a respectful and inclusive atmosphere.

Discuss any experience you have with AWS, GCP, or other cloud platforms. Highlight specific services you've utilized and why you appreciated them. Make sure to align your response with PayPay's tech stack to show familiarity with their infrastructure.

Share a relevant situation where you identified and resolved a complex production issue. Discuss the steps you took to investigate the problem, the tools you used, and how your actions positively impacted the project and the team's workflow.

Be prepared to explain an instance where you've implemented or worked with microservices. Discuss the benefits and challenges you've experienced, and focus on how you ensured communication between services and managed data consistency.

Emphasize your commitment to continuous learning by mentioning specific resources like blogs, podcasts, online courses, or conferences. Share instances where you've implemented new technologies in past projects to illustrate your proactive approach.

Discuss your typical process for a new project, including planning, development, testing, and deployment. Highlight any methodologies you follow such as Agile or Scrum and how you ensure quality control throughout each stage.

Express your enthusiasm for PayPay's growth and innovation in the FinTech space. Discuss how PayPay’s mission aligns with your values and how your skills and experiences make you a perfect fit for the role. This is an opportunity to reflect your knowledge of the company and its engineering culture.