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

1 week ago

Mumbai, Maharashtra, India Global PayEX Full time

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

We'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 

with the subject line 

"Senior Software Engineer – Asynchronous Java | [Your Name]"

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