Java Developer

HCL Technologies Limited; Greater London; On-site; GBP 85,000 - 120,000; Full time

Job summary

HCLTech is a global technology company seeking a skilled Java microservices engineer in London. The role focuses on designing, developing, and maintaining high-performance microservices using Java 17 and Spring Boot, with reactive WebFlux and REST APIs.

You will collaborate across teams to deliver end-to-end solutions, implement event-driven messaging with IBM MQ and Kafka, and contribute to code quality, documentation, and continuous improvement.

Responsibilities

• Designing, developing, and maintaining high-performance, scalable microservices using Java 17 and Spring Boot framework
• Building reactive and non-blocking applications leveraging Spring WebFlux to handle high-concurrency workloads efficiently
• Developing and consuming RESTful APIs following industry best practices and ensuring proper documentation
• Implementing event-driven architecture using IBM MQ and Apache Kafka for seamless asynchronous communication between services
• Collaborating with cross-functional teams including frontend developers, architects, and product owners to deliver end-to-end solutions
• Writing clean, maintainable, and well-documented code adhering to coding standards and best practices. Participating in code reviews, providing constructive feedback, and ensuring code quality across the team
• Troubleshooting production issues, performing root cause analysis, and implementing effective fixes
• Contributing to continuous improvement initiatives by identifying opportunities for optimization and automation

Skills

Java 17

Spring Boot

Spring WebFlux

REST APIs

Microservices

IBM MQ

Kafka

Tools

IBM MQ

Kafka

Job description

HCLTech is a global technology company, home to 219,000+ people across 54 countries, delivering industry-leading capabilities centered on digital, engineering and cloud, powered by a broad portfolio of technology services and products. We work with clients across all major verticals, providing industry solutions for Financial Services, Manufacturing, Life Sciences and Healthcare, Technology and Services, Telecom and Media, Retail and CPG, and Public Services. Consolidated revenues as of $13+ billion.

For more information on how we process your personal data, please refer to HCLTech’ s Candidate Data Privacy Notice.

Job Description:

• Designing, developing, and maintaining high-performance, scalable microservices using Java 17 and Spring Boot framework
• Building reactive and non-blocking applications leveraging Spring WebFlux to handle high-concurrency workloads efficiently
• Developing and consuming RESTful APIs following industry best practices and ensuring proper documentation
• Implementing event-driven architecture using IBM MQ and Apache Kafka for seamless asynchronous communication between services
• Collaborating with cross-functional teams including frontend developers, architects, and product owners to deliver end-to-end solutions
• Writing clean, maintainable, and well-documented code adhering to coding standards and best practices. Participating in code reviews, providing constructive feedback, and ensuring code quality across the team
• Troubleshooting production issues, performing root cause analysis, and implementing effective fixes
• Contributing to continuous improvement initiatives by identifying opportunities for optimization and automation

Skill Matrix

Skill

Expert-level understanding of Java 17 features including records, sealed classes, pattern matching, and enhanced switch expressions

Spring Boot

Strong hands-on experience in building production‑grade applications using Spring Boot

Spring WebFlux

Proficiency in developing reactive, non‑blocking applications using Spring WebFlux and Project Reactor

REST APIs

Expertise in designing, developing, and securing RESTful APIs with proper versioning and error handling

Microservices

Solid experience in microservices architecture including service discovery, API gateway, circuit breakers, and distributed tracing

IBM MQ

Hands‑on experience with IBM MQ for enterprise messaging and integration

Strong knowledge of Kafka for building event‑driven systems, including producers, consumers, and stream processing.