core Java backend/system-level developer

Crisil; Maharashtra; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

Crisil in India seeks a strong Core Java developer to drive backend services using Java 17/21 in a Linux environment. You will own low-level performance, memory optimization and inter-service communication via REST and messaging while ensuring robust design and error handling.

You will collaborate with cross-functional teams, participate in CI/CD pipelines, and work on low-latency, distributed systems, focusing on writing efficient Java and keeping data fresh in memory.

Qualifications

• Strong core Java development experience (Java 1.8+; current projects in Java 17/21).
• Strong command of: OOP concepts, Java Collections, Exception handling, Multithreading & concurrency.
• Experience in inter‑service communication (REST, TCP, messaging).
• Experience with ZMQ for TCP-based communication and HTTP‑based communication in Python.
• Ability to work independently with minimal supervision.
• Hands‑on experience with caching, memory optimization and maintaining latest data in temp & process memory.
• Experience in distributed messaging systems.
• Comfort working in Linux environments.

Skills

Core Java

OOP concepts

Java Collections

Exception handling

Multithreading & concurrency

REST & Messaging

Linux

Inter-service communication

Distributed messaging systems

Caching & memory optimization

Python knowledge

CI/CD pipelines

Agile methodology

Tools

ZMQ

HTTP (Python)

Job description

Job Description (JD) –

Must Have (Core Skills)

• Strong Core Java developer (minimum Java 1.8; current work in Java 17/21)
• Strong command of: o OOP concepts o Java Collections o Exception handling o Multithreading & concurrency (locks, executors, sync, thread pools) o Experience in inter‑service communication (REST, TCP, messaging)
• Experience with: o ZMQ for TCP-based communication o HTTP‑based communication in Python (or any other language) components
• Ability to work independently with minimal supervision
• Hands‑on experience with Caching, memory optimization and maintaining latest data in temp & process memory
• Experience in distributed messaging systems
• Comfort working in Linux environments

Good to Have

• Working knowledge of Python
• Experience with Job Scheduler
• Familiarity with ReactJS (only optional, front‑end exposure)
• Experience with CI/CD pipelines and Agile methodology
• Exposure to low‑latency applications

Not Required

No requirement for Spring, Spring Boot, Hibernate or ORM experience.