Senior Java Developer

Jobtailor; Cardiff; On-site; GBP 60,000 - 90,000; Full time

Job summary

Jobtailor in the United Kingdom is seeking a senior software engineer to design, develop and maintain enterprise applications using Java 17+/21 and Spring Boot. You will collaborate in Agile teams, mentor developers, and drive improvements in software delivery practices.

Responsibilities include building RESTful APIs, microservices, cloud-native solutions on AWS, and ensuring quality through automated testing and CI/CD. Strong problem-solving and stakeholder engagement are essential.

Qualifications

• Strong commercial experience developing enterprise applications using Java 17+/21.
• Strong experience with Spring Boot and related ecosystem frameworks.
• Proven experience designing and developing RESTful APIs and microservices-based architectures.
• Strong understanding of distributed systems, event-driven architectures, and asynchronous processing patterns.
• Experience with relational databases such as PostgreSQL, MySQL, or SQL Server, including query optimisation and data modelling.
• Good understanding of modern software architecture principles, including microservices, domain-driven design (DDD), CQRS, and API-first development.
• Experience with cloud-native development and deployment, ideally within AWS, including ECS, Lambda, API Gateway, ECR, S3, RDS, and CloudWatch.
• Hands-on experience with Docker and orchestration/deployment pipelines.
• Strong knowledge of automated testing, including unit, integration, and end-to-end testing using JUnit, Mockito, and Testcontainers.
• Experience using Git and GitHub
• Familiarity with CI/CD pipelines and modern software delivery practices.

Responsibilities

• Contribute to design, development, and maintenance of enterprise applications and platforms.
• Collaborate across Technology and business to improve systems and deliver new capabilities.
• Gather, analyse, and document requirements and translate into user stories and technical solutions.
• Design, develop, test, and maintain code for web, mobile, and desktop apps using Agile practices.
• Investigate, troubleshoot, and resolve production issues including incidents and escalations.
• Contribute to architectural discussions and technical decision-making for scalable solutions.
• Participate in design reviews and peer code reviews.
• Support releases, deployments, and platform enhancements.
• Work with QA teams to meet functional, performance, security, and reliability standards.

Skills

Java 17+/21 Development

Spring Boot Framework

RESTful API Design

Microservices Architecture

Cloud-Native Development (AWS)

Docker

GitHub

CI/CD Pipelines

Automated Testing

Agile/Scrum Methodologies

Tools

AWS (ECS, Lambda, API Gateway, ECR, S3, RDS, CloudWatch)

Docker

GitHub

Job description

• Contribute to the design, development, and maintenance of business-critical applications, services, and platforms


• Support continuous improvement of team practices, processes, and ways of working


• Collaborate across Technology and the wider business to improve systems, streamline processes, and deliver new capabilities


• Gather, analyse, and document business requirements and translate them into user stories and technical solutions


• Design, develop, test, and maintain code for web, mobile, and desktop applications using Agile development practices


• Investigate, troubleshoot, and resolve production issues, including critical incidents and service escalations


• Contribute to architectural discussions and technical decision-making for scalable, secure, and maintainable solutions


• Participate in design reviews and peer code reviews


• Support application releases, deployments, and platform enhancements


• Work with quality assurance teams to meet functional, performance, security, and reliability standards


• Provide third-line technical support for complex application and platform issues


• Mentor and support other developers


• Learn and work with new technologies, programming languages, frameworks, and platforms as required


• Monitor emerging technologies, industry trends, and development practices and recommend improvements


• Own technical deliverables and ensure alignment with business objectives


• Report to the Development Manager

Requirements

• Strong commercial experience developing enterprise applications using Java 17+/21


• Strong experience with Spring Boot and related ecosystem frameworks


• Proven experience designing and developing RESTful APIs and microservices-based architectures


• Strong understanding of distributed systems, event-driven architectures, and asynchronous processing patterns


• Experience with relational databases such as PostgreSQL, MySQL, or SQL Server, including query optimisation and data modelling


• Good understanding of modern software architecture principles, including microservices, domain-driven design (DDD), CQRS, and API-first development


• Experience with cloud-native development and deployment, ideally within AWS, including ECS, Lambda, API Gateway, ECR, S3, RDS, and CloudWatch


• Hands-on experience with Docker and orchestration/deployment pipelines


• Strong knowledge of automated testing, including unit, integration, and end-to-end testing using JUnit, Mockito, and Testcontainers


• Experience using Git and GitHub


• Familiarity with CI/CD pipelines and modern software delivery practices


• Ability to investigate and resolve complex production issues, including performance tuning and root cause analysis


• AI literacy, with practical experience using GitHub Copilot, Claude, or similar AI-assisted development tools


• Strong problem-solving skills and ability to work independently and take ownership of technical solutions


• Experience working effectively within Agile/Scrum delivery teams


• Excellent communication, stakeholder engagement, and collaboration skills


• Commitment to continuous improvement, engineering excellence, and ongoing professional development


• Desirable: experience with React and TypeScript


• Desirable: experience with Kafka


• Desirable: knowledge of Terraform or AWS CDK


• Desirable: experience in highly regulated, compliance-driven, or security-focused environments


• Desirable: experience mentoring developers and leading technical initiatives


• Desirable: experience contributing to architecture decisions and engineering standards across multiple teams


• Desirable: exposure to mobile application development frameworks


• Located within commuting distance of Cardiff

Core Competencies

Demonstrates expertise in developing enterprise applications using Java 17+/21 and Spring Boot, with a strong focus on RESTful APIs and microservices architectures. Proven ability to collaborate within Agile teams, mentor developers, and drive continuous improvement in software delivery practices.

Highest-signal resume keywords

• Java 17+/21 Development


• Spring Boot Framework


• RESTful API Design


• Cloud-Native Development (AWS)


• Automated Testing (JUnit, Mockito)

ATS Optimization Keywords

Hard Skills

• Java Development


• Spring Boot


• RESTful API Development


• Microservices Architecture


• Relational Databases (PostgreSQL, MySQL, SQL Server)


• Cloud-Native Development


• Docker


• Automated Testing


• Git


• Agile/Scrum Methodologies

Soft Skills

• Problem-Solving


• Communication


• Collaboration


• Stakeholder Engagement


• Mentoring

Industry Keywords

• Enterprise Applications


• Continuous Improvement


• Software Architecture Principles


• Compliance-Driven Environments


• Technical Decision-Making

Tools & Technologies

• AWS (ECS, Lambda, API Gateway, ECR, S3, RDS, CloudWatch)


• Docker


• GitHub


• CI/CD Pipelines


• GitHub Copilot