Senior Software Engineer – Asynchronous Java, Spring Boot, Vert.x, MongoDB

Location: Mumbai (Work-from-Office)

Department: Engineering | Industry: FinTech / SaaS

Experience: 4+ years | Compensation: Competitive (₹12–20 LPA based on fitment)

About Global PayEX

At Global PayEX, we build world-class AI-driven fintech platforms trusted by global banks and Fortune-scale enterprises. Our solutions power real-time reconciliation, payments, and working-capital automation for clients like JPMorgan, Citi, ITC, and Tata Group. We're now expanding our engineering team in Mumbai to strengthen our asynchronous, event-driven backbone that processes millions of financial transactions every day.

Role Overview

e're looking for a Senior Software Engineer with deep expertise in asynchronous Java, Vert.x, Spring Boot, and MongoDB. You'll architect and build scalable, low latency microservices that form the core of our enterprise-grade SaaS stack. This is a hands-on role for someone who thrives on solving performance challenges, optimizing concurrency, and leading by example within agile teams.

Key Responsibilities

• Design and implement non-blocking, event-driven microservices using Vert.x and Spring Boot.

• Optimize application performance, scalability, and resilience in high throughput environments.

• Design efficient MongoDB schemas and indexes for large-scale transactional workloads.

• Collaborate cross-functionally with DevOps, frontend, AI, and QA teams to deliver end-to-end solutions.

• Lead code reviews, write unit/integration tests, and uphold engineering best practices.

• Troubleshoot production issues and participate in on-call rotations when required.

• Mentor junior developers and contribute to architecture and sprint discussions.

• Participate actively in Agile ceremonies – planning, estimation, and retrospectives.

Required Skills & Experience

• 4+ years of backend development in Java.

• Strong understanding of asynchronous programming and event driven architectures.

• Proven expertise in Vert.x, including event bus, workers, and reactive patterns.

• Hands-on experience with Spring Boot microservices.

• Proficiency in MongoDB (aggregation framework, schema design, indexing).

• Solid experience with RESTful APIs and OpenAPI/Swagger documentation.

• Familiarity with Kafka, RabbitMQ, or message queues is a plus.

• Strong debugging, performance tuning, and concurrency optimization skills.

• Sound grasp of OOP, design patterns, and SOLID principles. Preferred Qualifications

• Experience in SaaS or FinTech/Banking systems.

• Exposure to Project Reactor or RxJava reactive frameworks.

• Familiarity with Docker, Kubernetes, and CI/CD pipelines (Jenkins, GitLab CI, etc.).

• Working knowledge of cloud environments (AWS/Azure/GCP).

Why Join Global PayEX

• Build cutting-edge asynchronous systems at global scale.

• Work alongside a world-class fintech engineering team.

• Collaborative, transparent, and innovation-driven culture.

• Direct exposure to AI agents and real-time financial data systems.

• Competitive compensation and a clear growth trajectory into tech leadership.

How to Apply:Send your CV or GitHub profile to [Confidential Information] with the subject line Senior Software Engineer – Asynchronous Java | [Your Name]