We are looking for a Calypso Lead Developer with 6+ years of experience specialising in Calypso API development and Core Java customisation. You will lead the design, development, and delivery of Calypso-based solutions — building robust API integrations, custom extensions, and platform enhancements across our capital markets technology estate. You will combine deep Calypso platform expertise with strong Core Java and API development skills — delivering high-quality, scalable, and maintainable solutions that support trading, risk, back office, and regulatory requirements.Key ResponsibilitiesCalypso API & Core Java DevelopmentLead the design and development of Calypso API integrations — building robust, performant REST and Calypso-native API solutions that connect Calypso with internal and external systems.Develop complex Calypso customisations using Core Java — extending Calypso platform functionality for bespoke trading, back office, and accounting requirements.Design and implement Calypso event-driven integrations — configuring message-based interfaces using MQ, JMS, and SWIFT for real-time and batch data exchange.Build and maintain Calypso plugin extensions — developing custom calculators, workflow actions, and business logic extensions aligned to capital markets business requirements.Design and develop RESTful APIs that expose Calypso data and functionality to downstream consumers — risk systems, reporting platforms, and front office applications.Lead code reviews — enforcing Calypso development standards, Core Java best practices, and API design principles across the development team.Mentor and guide junior Calypso developers — sharing platform expertise, Java development skills, and capital markets domain knowledge.Calypso Platform Configuration & IntegrationConfigure and maintain Calypso modules — trade capture, back office, accounting, and risk — aligned to business and regulatory requirements.Design and implement Calypso interface configurations — SWIFT, FIX, MQ, XML, and REST — connecting Calypso with front office, risk, finance, and external counterparty systems.Manage Calypso static data configuration — counterparty, product, account,



and workflow definitions — ensuring accuracy and consistency across environments.Support Calypso platform upgrades — conducting impact assessments, updating customisations, and validating functional integrity across version transitions.Implement Calypso batch processing workflows — scheduling, dependency management, and failure handling for end-of-day and intraday processing cycles.Conduct Calypso performance tuning — optimising API response times, batch processing throughput, and database query performance for high-volume capital markets workloads.Technical Architecture & DeliveryContribute to technical architecture decisions — providing Calypso API and Core Java expertise to solution design, integration patterns, and platform evolution discussions.Design scalable, maintainable integration architectures — applying microservices patterns, event-driven design, and API-first principles to Calypso integration solutions.Write and maintain comprehensive unit and integration tests — JUnit, Mockito — ensuring code quality and regression confidence across all Calypso customisations and API solutions.Build and maintain CI/CD pipelines for Calypso development — automating build, test, and deployment workflows using Jenkins or GitLab CI.Produce clear technical documentation — API specifications, integration designs, customisation guides, and deployment runbooks.Collaborate with Solution Architects, Business Analysts, and Operations teams — translating capital markets business requirements into well-designed Calypso technical solutions.Capital Markets DomainApply strong capital markets domain knowledge — financial instruments (fixed income, FX, derivatives, equities, repos), trade lifecycle, and back office processes — to design accurate, fit-for-purpose Calypso solutions.Support front office, middle office, risk, and finance teams — providing Calypso API and technical expertise to resolve data, integration, and platform issues.Contribute to regulatory reporting initiatives — MiFID II, EMIR,



APRA — designing Calypso API solutions that accurately extract and deliver regulatory data to reporting platforms.What We're Looking For6+ years of Calypso platform development experience with deep expertise in Core Java customisation and API development in capital markets environments.Robust Core Java skills — advanced OOP, design patterns, multithreading, and performance optimisation — applied to Calypso platform customisation and extension development.Proven Calypso API development experience — REST API design and development, Calypso-native API integration, and event-driven interface implementation.Deep Calypso platform knowledge — trade capture, back office, accounting, and risk modules — with strong understanding of Calypso architecture and customisation framework.Strong capital markets domain knowledge — financial instruments, trade lifecycle, back office operations, and regulatory reporting requirements.Advanced SQL skills — Oracle / PostgreSQL — complex querying, stored procedures, and performance tuning for Calypso database layers.Experience with messaging technologies — MQ, JMS, SWIFT — for Calypso interface and integration development.Hands-on CI/CD experience — Jenkins or GitLab CI — for automated Calypso build, test, and deployment pipelines.Proven technical leadership — leading Calypso development teams, conducting code reviews, and mentoring junior developers.Excellent communication and stakeholder management skills — engaging business, operations, and technology stakeholders effectively.Nice to HaveSpring Boot experience — building microservices and REST APIs alongside Calypso integrations.Knowledge of FIX protocol — order and execution data integration with Calypso.Experience with cloud platforms — AWS or Azure — for Calypso infrastructure hosting and API deployment.Familiarity with Calypso collateral management and regulatory reporting modules.Knowledge of APRA regulatory reporting requirements and Australian market conventions.Exposure to containerisation — Docker / Kubernetes — for Calypso API microservices deployment.Calypso certification or formal Calypso training programme completion.Experience in Investment Banking, Capital Markets, or Asset Management environments.

📌 Calypso Lead Developer (Mumbai)
🏢 Accolite
📍 Mumbai