Junior Software Developer jobs in United Kingdom

We are looking to bring onboard a Senior Developer - Java & React who will be guiding the Security Financing & Collateral Management (SFCM) team through the transformation of its legacy desktop-based trading platform into a modern, web-based solution. This transformation will include developing a new front end built with React and Redux, as well as enhancing the Java-based backend application server to fully support this modernization effort.In this role, you will be responsible for upholding architectural standards, defining and promoting best practices, and ensuring the delivery of a scalable, high‑performance, and maintainable user interface.**Responsibilities:** Work with other Java back-end developers to Design and implement scalable back-end services suitable to ensure seamless integration between services and the new user interface.Lead code reviews, technical sessions, and hands-on mentorship to build team competence and ensure sustainable knowledge transfer. Partner with QA and DevOps teams to align development with quality, security, and regulatory requirements specific to financial services. Implement secure coding standards, validate user inputs, manage authentication and authorization flows, and ensure alignment with enterprise and regulatory security requirements throughout the development lifecycle.**Requirements:** **Education:** **Experience:** * and Service-oriented or micro-services based back-end java development.* Strong experience with React and related libraries.* Proficient in JavaScript and TypeScript.* Experienced in state management using Context API or Redux.* Experienced with data grids, such as AG Grid or similar tools.* Skilled in CSS, including tools like styled-components.* Background in Spring Boot and core Java development.* Proficient in building and integrating RESTful APIs.* Experience with designing and implementing front end migration into React with Redux.* Ability to work well as a guide of an existing development team.* Ability to effectively communicate with the existing development team and management.* Enthusiastic and professional, with a drive to work on challenging projects.* Experience with coordinating/managing teams. 8+ years of professional development experience with minimum of 3+ years in front-end development experience with modern frameworks**Preferred Qualifications:*** C++ development experience* Familiarity with web-based testing practices (automation)* Experience with designing and implementing front end migration into React with Redux.* Experience working within an Agile squad model, collaborating closely with Product Owners, Business Analysts, and QA teams.* Deploying and hosting a web based application in a production environmentVersion Control: Git (preferred) or experience with similar systems such as Perforce. DevOps / CI-CD (desirable): Familiarity with containerization, deployment pipelines, and related automation tools.