Job Title: Senior Java Developer Location: Glasgow- 5 days in the office Day Rate: £410 inside ir35 Duration- Until December 2026- may be extended Job Type: Contract Job Description We are seeking an experienced Senior Java Developer to join our growing development team. The ideal candidate will be responsible for designing, developing, and maintaining scalable, high-performance software applications using modern backend and frontend technologies. This role requires strong hands-on expertise in Java-based frameworks, cloud platforms, and relational databases, along with exposure to modern frontend tools. Key Responsibilities Design, develop, and maintain high-quality software solutions using Java, Spring Boot, Spring MVC, AWS, SQL, JavaScript, and MySQL Collaborate with cross-functional teams to define requirements, design solutions, and deliver new features Apply hands-on knowledge of React JS, Redux, HTML5, and CSS3 to support frontend development Work with frontend testing tools such as Jest (exposure preferred) Ensure application performance, scalability, quality, and responsiveness Identify performance bottlenecks, troubleshoot issues, and fix bugs efficiently Maintain high standards of code quality, organization, and automation Implement security best practices and data protection measures Perform software analysis, programming, testing, debugging, and documentation Oversee and contribute to technical documentation across the SDLC Provide technical guidance and mentorship to team members Participate in code reviews to ensure adherence to best practices Stay current with emerging technologies and industry trends Continuously improve applications by evaluating and adopting new tools and technologies Required Skills & Qualifications 9-13 years of hands-on experience in Java Full Stack development Strong expertise in Java, Spring Boot, Spring MVC Experience working with AWS and relational databases ( MySQL / SQL ) Proficiency in JavaScript and exposure to modern frontend frameworks Working knowledge of React JS, Redux, HTML5, CSS3 Familiarity with frontend testing frameworks such as Jest Strong problem-solving, debugging, and analytical skills Excellent communication and collaboration abilities If you are interested in this opportunity, please apply now with your updated CV in Microsoft Word/PDF format. Disclaimer Notwithstanding any guidelines given to level of experience sought, we will consider candidates from outside this range if they can demonstrate the necessary competencies. Square One is acting as both an employment agency and an employment business, and is an equal opportunities recruitment business. Square One embraces diversity and will treat everyone equally. Please see our website for our full diversity statement.