Senior Java Developer - UPI System

86400 (An Initiative By Mobileware Technologies); Mumbai; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

86400 (An Initiative By Mobileware Technologies) is looking for a Software Engineer (Java Development) in Mumbai. The ideal candidate will possess strong core Java skills and hands-on experience with UPI systems. The role involves designing and implementing UPI-based payment solutions, ensuring high availability and regulatory compliance.

Successful candidates will collaborate closely across the Software Development Lifecycle to deliver reliable and scalable banking applications that enhance the digital payments landscape.

Qualifications

• 4+ years of experience in Java backend development.
• Strong expertise in Core Java, OOP concepts, and design patterns.
• Hands-on experience in RESTful APIs/Web Services.

Responsibilities

• Design, develop, and maintain UPI-based payment solutions.
• Build scalable backend services using Java technologies.
• Develop APIs for UPI integrations.

Skills

Core Java

Java EE

RESTful APIs

Spring / Spring Boot

Multithreading

Education

Bachelor’s degree in computer science / IT / Electronics

Tools

MySQL

Hibernate

Apache Tomcat

Job description

Position: Software Engineer (Java Development) – UPI

Industry Preference: Banking/Digital Payments. Reports to: Tech Lead.

About the Role

We are looking for a skilled Java Developer with hands‑on experience in UPI to join our high‑performing engineering team. You will work on mission‑critical banking/payment applications that demand high availability, scalability, and security.

As a key contributor, you will help design and build robust backend systems aligned with our product strategy, ensuring seamless digital payment experiences across UPI and other payment rails.

Key Responsibilities

• Design, develop, and maintain UPI‑based payment solutions with high availability and performance
• Contribute across all phases of the Software Development Lifecycle (SDLC)
• Build scalable backend services using Java / Java EE technologies
• Develop APIs for UPI integrations (e.g., PSP, TPAP, bank integrations, NPCI switch connectivity)
• Write clean, efficient, and testable code following best practices
• Perform code reviews, debugging, and performance optimization
• Ensure applications comply with UPI/NPCI guidelines, security, and regulatory standards
• Work on real‑time transaction processing systems with strong focus on reliability and latency
• Prepare and manage releases of software components
• Convert business requirements into technical solutions
• Support continuous improvement through research of new technologies and tools
• Participate in architecture discussions and design reviews
• Maintain test environments and implement unit/integration testing
• Identify system bottlenecks and optimize performance
• Create technical documentation, user guides, and training materials

Required Skills & Experience

• Bachelor’s degree in computer science / IT / Electronics or equivalent
• 4+ years of experience in Java backend development
• Strong expertise in Core Java, Collections Framework, OOP concepts and design patterns, Java EE (JSP, Servlets)
• Experience with frameworks such as Spring / Spring Boot (preferred) or Struts
• Hands‑on experience in RESTful APIs / Web Services (SOAP & REST), XML and JSON processing
• Database knowledge: MySQL / PostgreSQL, ORM frameworks like Hibernate / JPA
• Experience with application servers like Apache Tomcat
• Strong understanding of multithreading and concurrency (important for UPI systems)
• Experience with unit testing frameworks like JUnit

UPI / Payments Domain Expertise

• Hands‑on experience with UPI integrations (PSP/TPAP/Banks)
• Understanding of NPCI specifications and UPI architecture
• Knowledge of UPI flows (Collect, Pay, Intent, QR)