Senior Backend Engineer

Job Description

PayPay India is looking for a Senior Backend engineer to work on our payment system to deliver the best payment experience for our customers.

Main Responsibilities

• Design large scale systems with high complexity to support our high throughput applications.
• Understand how to leverage infrastructure for solving such large scale problems.
• Develop tools and contribute to open source wherever possible.
• Adopt problem solving as a way of life – always go to root cause! Support the code you write in production.
• [Extra requirements depending on the potential team it has been identified]

Tech Stack

We select the best combination of tech at times.

| Java, Kotlin, Scala

| Spring Boot, JUnit, Reselience4j, Feign

| MySQL/AuoraDB, DynamoDB, ELK, Kafka, Redis, TiDB

| Docker, Kubernetes, ArgoCD, AWS, GCP

| GitHub, IntelliJ, Gradle, Maven, npm/yarn, Flyway, Jenkins, snyk,

| Bigquery, Kibana, Spark

| PlantUML, draw.io, miro.com

| Slack, Zoom

Qualifications

• 6+ years of experience having excellent skills in Java & any other generalized programming language, such as Scala, Python, or Go.
• Interest and ability to learn other coding languages as needed.
• Experience with SQL and NoSQL databases, along with distributed cache.
• Strong fundamentals in data structures, algorithms and object oriented programming.
• In-depth understanding of concurrency and distributed computing.
• Experience implementing platform components such as RESTful APIs, Pub/Sub Systems, and Database Clients.
• Experience with microservices.
• Experience designing high traffic systems.
• Degree in Computer Engineering or Computer Science or 5+ years equivalent experience in SaaS platform development.
• Business of English or Japanese
• [Extra requirements depending on the potential team it has been identified]

Preferred Qualifications

• Experience in working for system development in finance, payment, or similar industries.
• Language ability in Japanese and English is a plus (We have a professional translator but it is nice to have language skills).
• Experience with AWS services.
• Leverage AI/LLM-based tools in daily workflows (e.g., code development, reviews, testing, debugging, documentation), while ensuring human oversight, judgment, and accountability drive the final product.
• [Extra requirements depending on the potential team it has been identified]