Software Engineering Professional (Cloud Native Java Developer)

Why this job matters

Cloud Native Java Developer - To Individually contribute and Drive transformation of our existing Java microservices deployed on Amazon Elastic Kubernetes Service (EKS) to serverless AWS Lambda functions , below are the Roles and Responsibilities

Key Responsibilities

What you’ll be doing

• Develop and deploy serverless applications using Quarkus/Spring Boot and AWS Lambda
• Build RESTful APIs and event-driven microservices using cloud-native patterns
• Optimize cold-start performance using GraalVM native images
• Integrate with AWS services such as AWS API Gateway, S3, DynamoDB, CloudWatch and Postgres
• Implement and manage Lambda authorizers (custom and token-based) for securing APIs
• Design and configure AWS API Gateway for routing, throttling, and securing endpoints
• Integrate OAuth 2 -0 authentication flows using Azure Active Directory as the identity provider
• Descent Understanding of resilience patterns
• Write unit and integration tests using JUnit, Mockito, and Quarkus testing tools
• Collaborate with DevOps teams to automate deployments using AWS SAM, CDK, or Terraform
• Monitor and troubleshoot production issues using AWS observability tools
  
  

Migration Responsibilities

• Analyse existing Spring Boot microservices deployed on Kubernetes to identify candidates for serverless migration
• Refactor services to be stateless, event-driven, and optimized for short-lived execution
• Replace Kubernetes ingress and service discovery with API Gateway and Lambda triggers
• Migrate persistent state and configuration to AWS-native services (e.g., DynamoDB, S3, Secrets Manager)
• Redesign CI/CD pipelines to support serverless deployment workflows
• Ensure performance, cost-efficiency, and scalability in the new architecture
• Document migration strategies, patterns, and best practices for future reference
  
  

Technical Proficiency

Strong industry expereince of 4+ years with command of Java 8+, with deep understanding of:

• Functional interfaces (Function, Predicate, Supplier, Consumer)
• Streams API, lambda expressions, and Optional
• Proficiency in Java concurrency, including:
• Thread management, Executor Service, Completable Future, and parallel streams
• Designing thread-safe components and understanding concurrency pitfalls
• Understanding of AWS EKS (Elastic Kubernetes Service) , Docker Containers and Kubernetes fundamentals:
• Experience with resource requests and limits, pod autoscaling, and K8s networking
• Familiarity with transitioning workloads from EKS to serverless environments
  
  

With over 175 years of heritage, BT is now the flagship business brand of BT Group. We’ve brought together our best people and capabilities into a B2B powerhouse serving 1 -2 million business customers internationally.

We’re a global leader for secure connectivity and collaboration platforms for businesses of all shapes and sizes, from big household names and government departments, right through to sole traders and new start-ups. But it’s not just the technology that matters, it’s what it can do to help them build stronger, smarter, more secure businesses.

We value diversity and inclusion and believe in making a positive impact. We connect for good by championing digital inclusion and equipping people, businesses, and communities with digital skills to thrive.

As a member of our team, you will be part of an organisation that celebrates difference, fosters innovation and provides you with opportunities to be your best. With millions of businesses relying on us daily, joining BT means you can be part of a diverse and multi-skilled team that makes a significant impact to society.

A FEW POINTS TO NOTE:

Although these roles are listed as full-time, if you’re a job share partnership, work reduced hours, or any other way of working flexibly, please still get in touch.

We will also offer reasonable adjustments for the selection process if required, so please do not hesitate to inform us.

DON'T MEET EVERY SINGLE REQUIREMENT?

Studies have shown that women and people who are disabled, LGBTQ+, neurodiverse or from ethnic minority backgrounds are less likely to apply for jobs unless they meet every single qualification and criteria. We're committed to building a diverse, inclusive, and authentic workplace where everyone can be their best, so if you're excited about this role but your past experience doesn't align perfectly with every requirement on the Job Description, please apply anyway - you may just be the right candidate for this or other roles in our wider team.