Back End Developer

ACL Digital; India; On-site; INR 1,500,000 - 2,100,000; Full time

Job summary

ACL Digital is seeking a Senior Backend Engineer with strong Core Java and Spring Boot to design and build high-performance transactional systems for fintech applications. You'll contribute to a microservices architecture and ensure security and low latency in a banking context.

The role involves collaborating with cross-functional teams, mentoring juniors, and driving best practices in CI/CD and TDD in an Agile environment.

Qualifications

• At least 4 years of backend development experience in fintech or banking.
• Experience with Spring Boot, REST APIs, and microservices.
• Strong knowledge of Java memory management and multithreading.

Responsibilities

• Design, develop, and deploy scalable microservices using Java and Spring Boot.
• Optimize performance, address multithreading and memory issues.
• Securely integrate RESTful APIs with financial systems and gateways.
• Lead code reviews and promote CI/CD and TDD practices.

Skills

Core Java

Spring Boot

Microservices

Concurrency

REST APIs

Tools

Kafka

RabbitMQ

SQL databases

Linux

Shell scripting

Job description

Job Description: Senior Backend Engineer (Java, Spring Boot, Fintech/Banking)

Position Title: Senior Software Engineer / Lead Engineer — Backend

Experience Level: 4 to 8 Years

Location: (Insert Location / Remote / Hybrid)

Department: Core Engineering / Payments & Transaction Platforms

About the Role

We are seeking a highly skilled Senior Backend Engineer with a deep expertise in Core Java and distributed systems to join our core banking/fintech engineering team. In this role, you will design, build, and maintain high-performance, fault-tolerant transactional systems that handle millions of requests per day. You will play a pivotal role in evolving our microservices architecture, ensuring high availability, low latency, and rock-solid security for our financial products.

Key Responsibilities

• Design & Architecture: Architect, develop, and deploy scalable, low-latency microservices using Core Java and Spring Boot.
• Performance Optimization: Optimize applications for maximum speed, scalability, and efficiency. Troubleshoot complex multithreading, concurrency, and memory management (Garbage Collection) issues.
• System Integration: Securely design and integrate RESTful APIs with internal and external financial systems, clearing networks, or payment gateways.
• Database & Messaging: Manage data persistence using relational (SQL) or NoSQL databases and handle asynchronous data pipelines using message brokers like Kafka or RabbitMQ.
• Linux Environment Management: Own application deployment and troubleshooting inside Linux environments. Write efficient shell scripts to automate monitoring and log analysis.
• Technical Leadership: Lead code reviews, mentor junior engineers, and drive best practices in CI/CD pipeline management and test-driven development (TDD).

Required Technical Skills & Qualifications

• Core Technical Stack
  • Java Mastery: Deep, production-level knowledge of Core Java (Java 8 or higher) with a strong grasp of data structures, OOPs principles, collections, JVM memory models, and multithreading/concurrency.
  • Frameworks: Hands-on experience developing enterprise-grade microservices using Spring Boot, Spring MVC, Spring Security, and Hibernate/JPA.
  • Architecture: Proven experience in designing distributed systems and microservices patterns (API Gateway, Service Discovery, Circuit Breaker).
• OS & Scripting: Strong proficiency in Linux/Unix operating systems, shell commands, and debugging in a command-line environment.
• Domain & Data Stack
  • Fintech/Banking Domain: Min. 2 years of experience working in banking tech, investment banking GCCs, payment systems, digital lending, wallets, or financial transactional platforms.
  • Databases: Solid understanding of relational databases (PostgreSQL, Oracle, or MySQL) and query optimization.
  • Messaging Systems: Experience with event-driven architectures utilizing Kafka, RabbitMQ, or AWS SQS.
• Soft Skills & Culture Fit
  • Excellent problem-solving, analytical, and troubleshooting skills.
  • Strong communication skills with the ability to articulate complex technical ideas to domain stakeholders.
  • Experience working in an Agile/Scrum environment.