Role: Application Developer Tech stack: Java, TypeScript, Endur Industry: Energy trading Day Rate: £500-600/d inside IR35 Location: London (hybrid) Contract: 6 months (strong extension potential) X4 Technology are partnered with a global energy trading company looking for a skilled Application Developer to join their team on a contract basis. In this role, you would join the agile IT team, supporting critical applications used in energy trading and asset management operations. You’d be working in a dynamic environment, contributing to the development and integration of solutions that support renewable energy trading, financial analytics, and risk management. Responsibilities of the Contract Application Developer (Java, Typescript, Endur) Develop, enhance and maintain applications using Java and TypeScript. Customise and support Endur (Openlink), including JVS and AVS scripting. Collaborate with product owners, business analysts, and other developers in an agile setting. Implement APIs and services for internal and external data integrations. Troubleshoot production issues and provide timely support and resolution. Participate in code reviews, design sessions, and continuous improvement initiatives. Ensure software quality through unit testing, automation, and documentation. Requirements of the Contract Application Developer (Java, Typescript, Endur): Proven experience in Java development (Spring Boot, REST APIs). Solid front-end experience with TypeScript and modern frameworks (e.g., Angular or React). Hands-on experience with Endur (Openlink), including JVS and AVS scripting. Familiarity with database technologies such as SQL Server or Oracle. Experience with CI/CD tools and version control (e.g., Git, Jenkins). The contract is for an initial 6 months with strong extension potential. The rate is £500-600/d inside IR35. Interviews are taking place from week commencing 26th May, so if you're an Application Developer with energy trading experience, please apply online for immediate consideration.