Java Backend Lead

We are looking for an experienced Java Backend Lead with 8 - 10 years of overall experience and at least 7 years of strong hands-on experience in Java Backend Development.

The ideal candidate should have deep expertise in Core Java 11, Spring Boot, Microservices, Multithreading, Data Structures & Algorithms, Design Patterns, Spring Security, Kafka, JPA/Hibernate, and AWS Cloud services.

The candidate will be responsible for designing, developing, and maintaining highly scalable, secure, and high-performance backend applications.

This role requires a strong hands-on engineer who can contribute to architecture and technical design, drive development best practices, troubleshoot complex production issues, and mentor other developers.

The ideal candidate should have a strong understanding of Java internals and be comfortable working on distributed systems, concurrent applications, event-driven architectures, and cloud-native backend services.

Key Responsibilities :

- Design, develop, and maintain scalable backend applications using Java 11 and Spring Boot.

- Lead the development of robust, highly available, and performance-oriented microservices.

- Translate business and technical requirements into scalable backend solutions.

- Participate in application architecture and technical design discussions.

- Define and implement appropriate design patterns, coding standards, and development best practices.

- Develop RESTful APIs and backend services for integration with internal and external applications.

- Implement secure APIs and application components using Spring Security.

- Develop and maintain distributed, event-driven services using Apache Kafka.

- Design and implement asynchronous processing and messaging workflows.

- Work with AWS services, including Amazon MSK, Amazon S3, and AWS Lambda.

- Develop and deploy serverless functions using AWS Lambda where appropriate.

- Design applications for scalability, reliability, performance, and fault tolerance.

- Analyze application performance and optimize code, database queries, APIs, and service interactions.

- Troubleshoot complex technical issues across application, database, messaging, and cloud layers.

- Conduct code reviews and ensure adherence to clean-code and engineering standards.

- Mentor and guide junior and mid-level developers on Java, Spring Boot, microservices, and software engineering practices.

- Collaborate with product managers, architects, QA engineers, DevOps teams, and other stakeholders.

- Participate in Agile/Scrum ceremonies including sprint planning, technical discussions, reviews, and retrospectives.

- Contribute to continuous improvement of development processes, architecture, and engineering practices.

- Ensure production-ready implementation through appropriate unit testing, integration testing, logging, monitoring, and error handling.

Required Technical Skills :

- 7+ years of hands-on experience in Java Backend Development.

- Strong proficiency in Core Java 11.

- Strong understanding of Java Collections Framework, Exception Handling, Generics, Streams, Lambda Expressions, Functional Interfaces, and Java 8+ features.

- Strong knowledge of Object-Oriented Programming (OOP) principles.

- Good understanding of JVM concepts and memory management.

- Strong understanding of Java concurrency and multithreading.

- Strong hands-on understanding of Java Multithreading and Concurrency.

- Experience working with threads, executors, thread pools, synchronization, locks, and concurrent collections.

- Understanding of race conditions, deadlocks, thread safety, and synchronization mechanisms.

- Ability to design high-performance concurrent applications.

- Strong knowledge of Data Structures and Algorithms.

- Hands-on understanding of arrays, linked lists, stacks, queues, trees, graphs, hash-based data structures, sorting, searching, and complexity analysis.

- Strong problem-solving and analytical skills.

- Ability to select appropriate data structures and algorithms based on application requirements.

- Strong understanding of HashMap internals, including :

1. Hashing mechanism.

2. Hash buckets and indexing.

3. Collision handling.

4. equals() and hashCode() contract.

5. Load factor and capacity.

6. Rehashing/resizing.

7. Collision resolution mechanisms.

8. Performance considerations.

9. Differences between HashMap, ConcurrentHashMap, LinkedHashMap, and other collection implementations.

- 6+ years of hands-on experience with Spring Boot.

- Strong knowledge of Spring Core and dependency injection.

- Experience building production-grade REST APIs and microservices using Spring Boot.

- Strong understanding of Spring configuration, profiles, dependency management, and application lifecycle.

- Experience with Spring Security for authentication and authorization.

- Experience with JAX-RS and RESTful web services.

- Knowledge of service-to-service communication and distributed application design.

- Experience with Hystrix or equivalent circuit-breaker/resilience frameworks.

- Strong hands-on experience designing and developing Microservices Architecture.

- Understanding of service decomposition and bounded contexts.

- Experience with inter-service communication.

- Knowledge of synchronous and asynchronous communication patterns.

- Understanding of service discovery, fault tolerance, resiliency, and scalability.

- Experience handling distributed transactions and failure scenarios.

- Understanding of API versioning and backward compatibility.

- Experience building independently deployable services.

- Strong working knowledge of Apache Kafka.

- Experience developing event-driven applications using Kafka.

- Understanding of producers, consumers, topics, partitions, offsets, and consumer groups.

- Experience designing asynchronous communication between microservices.

- Understanding of Kafka scalability, fault tolerance, and message-processing patterns.

- Exposure to Amazon MSK (Managed Streaming for Apache Kafka) is required.

- Strong experience with Spring Data JPA.

- Strong understanding of Hibernate ORM.

- Experience designing entities, relationships, repositories, and database access layers.

- Knowledge of JPQL, native queries, pagination, sorting, and transaction management.

- Understanding of lazy/eager loading and entity lifecycle.

- Ability to identify and resolve common ORM performance issues such as N+1 queries.

- Strong understanding of database transactions and concurrency.

- Experience developing serverless Lambda functions.

- Understanding of event-driven serverless architecture.

- Ability to integrate Lambda with APIs, messaging systems, storage, and other AWS services.

- Understanding of scalability, execution limits, error handling, and monitoring.

- Experience using S3 for object storage.

- Knowledge of buckets, objects, access policies, lifecycle management, and secure application integration.

- Experience integrating S3 with backend applications and serverless workflows.

- Hands-on exposure to Spring WebFlux.

- Understanding of reactive and non-blocking programming.

- Experience building reactive APIs and services.

- Knowledge of Project Reactor is an advantage.

- Experience using Spring WebClient for asynchronous/non-blocking HTTP communication.

- Understanding of connection management, timeout handling, retries, and error handling.

- Prior experience working in the e-commerce domain will be highly desirable.

- Exposure to high-volume transactions, order management, payment integrations, inventory, product catalogues, customer journeys, or marketplace systems will be an advantage.

- Experience building scalable systems capable of handling high traffic and transaction volumes is preferred.

- Provide technical leadership to backend engineering teams.

- Review technical designs and provide constructive architectural feedback.

- Conduct code reviews and establish coding best practices.

- Mentor developers and support technical skill development.

- Identify technical risks and propose appropriate solutions.

- Collaborate effectively with architects, product teams, QA, DevOps, and business stakeholders.

Skills :

- Take ownership of backend components from design through development, deployment, and production support.

- Bachelor's or Master's degree in Computer Science, Information Technology, Engineering, or a related discipline.

- 8 - 10 years of overall software development experience.

- Minimum 7 years of relevant Java Backend Development experience.

- Minimum 6 years of Spring Boot experience.

- Strong hands-on experience in microservices and distributed systems.

- Strong problem-solving and analytical capabilities.

- A strong hands-on Java Backend Engineer / Technical Lead.

- Highly proficient in Java 11 and Spring Boot.

- Strong in Microservices, Multithreading, DSA, Design Patterns, and Java internals.

- Comfortable designing scalable and high-performance backend systems.

- Experienced with Kafka and AWS cloud services.

- Strong in debugging, performance optimization, and production issue resolution.

- Capable of mentoring developers while remaining technically hands-on

Skills

Java, Spring Boot, AWS, Microservices Architecture, Kafka, Design Patterns, JPA, Hibernate, Java 11