Backend Engineer
First seen by Alion on Oct 7, 2026.
Job Description:
PayPay India is looking for a 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.
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:
- 4+ years of Experience in using Java under professional environment, or if you are non-Java user, excellent skills in generalized programming languages, such as Scala, Python and Go.
- Interest and ability to learn other coding languages as needed.
- Experience with NoSQL databases and distributed cache.
- Strong fundamentals in data structures, algorithms and object oriented programming.
- In-depth understanding of concurrency and distributed computing.
- Degree in Computer Engineering or Computer Science or 5+ years equivalent experience in SaaS platform development.
- Business of English or Japanese
Preferred Qualifications :
- Experience with implementing platform components such as RESTful APIs, Pub/Sub Systems, Database Clients.
- Experience with AWS services.
- Experience in working for system development in finance, payment, or similar industries
- Experience in system design, development of web system which handles massive amount of transactions or requires scalability
- Experience in microservices
- 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.
Remarks :
- Please note that you cannot apply for PayPay (Japan-based jobs) or other positions in parallel or in duplicate.
PayPay 5 senses :
- Please refer PayPay 5 senses to learn what we value at work.
Skills
Scala, Python, Golang, Backend Architecture, NoSQL, Microservices Architecture, Payment System, Java, Spring Boot, Data Structure, Algorithm