Java Developer - Contract Inside IR35 - Reading/Croydon

Cactus IT Solutions UK Ltd; London Borough of Croydon; On-site; GBP 70,000 - 110,000; Full time

Job summary

Cactus IT Solutions UK Ltd in Croydon is seeking a senior Java developer to design and deliver robust microservices and APIs. You will own significant components, mentor juniors, and drive quality through TDD/BDD and code reviews.

You will work with Spring, Spring Boot, Hibernate, Docker, Jenkins, and Kubernetes in a collaborative agile environment, translating complex requirements into reliable software while communicating technical concepts to non-technical stakeholders.

Qualifications

• Extensive server-side, hands-on Java 8+ development with Spring/Spring Boot and Hibernate.
• Strong microservice architecture understanding and REST API design.
• Experience with TDD/BDD, unit and integration testing (JUnit, Mockito).
• CI/CD with Docker, Jenkins, and Kubernetes, plus shell scripting and AWS basics.
• Frontend basics: HTML, JavaScript, jQuery; tooling like Mustache templates.

Responsibilities

• Lead a team of Java developers to deliver high-quality software solutions.
• Design and develop Java applications, APIs, and microservices.
• Collaborate with other teams for seamless integration of components.
• Conduct code reviews and ensure coding standards and best practices.
• Participate in architectural and design discussions in an Agile environment.

Skills

Java

Spring / Spring Boot

Hibernate

Microservices

REST APIs

JUnit / Mockito

Agile (Scrum, Kanban)

Mentoring

Code reviews

Communication

PostgreSQL

Shell scripting

AWS basics

Camel / ActiveMQ

Tools

Docker

Kubernetes

Jenkins

JUnit

Mockito

PowerMockito

WireMock

Apache Camel

ActiveMQ

Mustache Templates

Job description

• Extensive server-side, hands-on Java 8+ development experience with strong Spring, Spring Boot & Hibernate
• Strong understanding of Microservice architecture
• Experience building web services and APIs on REST
• Strong understanding of unit & integration tests, following TDD/BDD
• Experience using test frameworks like Junit, Mockito, Power Mockito & Wire mock.
• Experience and understanding of CICD pipeline of Docker, Jenkins, and Kubernetes
• Experience with Front End technologies: HTML, JavaScript, jQuery, Mustache Templates
• Led a team of Java developers to deliver high-quality software solutions.
• Design and develop Java applications, APIs, and microservices.
• Work collaboratively with other teams to ensure seamless integration of software components.
• Conduct code reviews and ensure adherence to best practices and coding standards.
• Actively participating in architectural & design discussions
• Experience with Agile development methodologies (Scrum, Kanban)
• Mentor junior developers and provide technical guidance to the team.
• Take ownership of scrum team's timelines and deliverables
• Proposing solutions to complex problems that are in the boundary of the existing system architecture.
• Have an ability to communicate technical concepts to a non-technical audience.
• Understanding of all the agile ceremonies.
• Experience in Relational Database Management System (eg PostgreSQL)

Nice to have skills:

• Knowledge of Workflow/Business Process Management tools
• Experience with Performance and Monitoring tools: JMeter, Kibana, Splunk, Dynatrace
• Experience writing Shell script.
• Understanding of Python
• Good understanding on AWS services (EC2, ECS, EKS, API Gateway and Serverless technologies)
• Integration Engine tools: Apache Camel and Active MQ for messaging, web services and distributed systems