We are expanding our world-leading Calypso practice at First Derivative and seeking experienced Calypso Developers to join high-profile transformation and implementation programmes within global capital markets environments. Calypso is a large-scale, front-to-back trading platform supporting trading, risk management and post-trade processing across asset classes, built on a robust Java-based architecture. This is an opportunity to work on complex greenfield implementations, upgrades and transformation initiatives, collaborating with global teams across EMEA, North America and APAC. Responsibilities Design, develop and deliver Calypso solutions across the full trade lifecycle within large-scale implementation and transformation programmes Collaborate closely with Front Office, Risk, Operations and Technology stakeholders to translate business requirements into technical solutions Support greenfield implementations, version upgrades and transformation initiatives across global capital markets environments Integrate Calypso with external systems through APIs, messaging and batch processing Contribute to the full software development lifecycle, from analysis and design through to deployment and post-go-live support Develop and maintain unit and integration tests to ensure high-quality deliverables Partner with development and testing teams across EMEA, North America and APAC to deliver within complex, fast-paced programmes Provide technical expertise on the Calypso object model and architecture to guide design decisions Troubleshoot and resolve complex technical issues across trading, risk and post-trade processes Requirements Proven experience as a Calypso Developer on implementation, upgrade or transformation programmes Hands-on expertise in Calypso (v16+ preferred) along with strong understanding of the Calypso object model and architecture Solid Java development skills including Spring and Hibernate Background in the full software development lifecycle (SDLC) with excellent object-oriented analysis and design skills Understanding of the trade lifecycle covering front office, risk and back-office processes Knowledge of one or more asset classes such as Rates, FX, Credit, Equities or Commodities Skills in integrating Calypso with external systems via APIs, messaging and batch processing Proficiency in SQL and relational databases Competency in writing unit and integration tests Strong problem-solving ability in fast-paced delivery environments Capability to collaborate effectively with development and testing teams