Top Tech Jobs & Startup Jobs in Belfast

Leads development and optimization of complex Ab Initio ETL applications supporting Citi’s Oracle General Ledger. Collaborates with finance users and technology teams, manages the SDLC in Agile environments, investigates data issues using SQL and Oracle, develops automation utilities, performs testing, supports implementations, and resolves production defects. The role requires technical leadership, strong financial technology experience, and expertise in data engineering, RDBMS, UNIX, shell scripting, and Jira.

Develop scalable full-stack financial applications using Java or Python, backend frameworks, modern JavaScript, and cloud platforms. Design application architecture, coding and testing standards, and system enhancements. Integrate generative AI APIs and technologies such as LLMs, vector search, prompt engineering, and agent workflows. Analyze complex technical and business problems, manage risk and compliance, and mentor mid-level developers and analysts.

Leads data strategy and architecture for fund accounting, administration, ETFs, IBOR, ABOR, regulatory reporting, and client reporting. Designs data models, warehouses, lakes, integration patterns, governance, lineage, metadata, and reporting structures. Gathers requirements, supports implementation, evaluates technologies, and partners with fund operations, accounting, reporting, and engineering stakeholders. Requires extensive financial services and funds-domain expertise, strong SQL and database skills, and leadership experience.

Design, develop, and maintain high-performance, low-latency electronic trading systems for equities execution. Collaborate with traders, quantitative researchers, product teams, infrastructure, support, and QA to deliver algorithmic trading, smart order routing, connectivity, market data, monitoring, reconciliation, and recovery capabilities. Improve testing frameworks, development tools, Agile practices, CI/CD, and platform reliability while contributing technical leadership in a globally distributed environment.

Lead a team developing and optimizing regulatory reporting frameworks and large-scale data pipelines. Design microservices and data integration components using Java and Spring Boot, process distributed datasets with Spark, Hadoop, and Hive, and build Kafka streaming solutions. Translate regulatory requirements into technical specifications, oversee testing and secure coding practices, mentor engineers, and support Agile delivery. Integrate AI and automation concepts for anomaly detection and data classification while optimizing MongoDB and relational database performance.

Develop enterprise-scale Python applications for Citi’s Wholesale Credit Risk Technology team. Build solutions using Python, FastAPI, Java, MCP, LLMs, and RAG architectures; work with onshore, offshore, and matrix teams; use CI/CD and Kubernetes; investigate bugs and production issues; resolve complex technical problems; and communicate progress to project leadership.

Design, develop, and operate a scalable GenAI prompt security platform protecting AI and LLM applications from adversarial attacks and prompt injection. Build automated security testing frameworks, secure APIs, and libraries; contribute to architecture, reliability, and scaling; deploy containerized solutions; and collaborate with Engineering, Operations, SRE, and global stakeholders.

Develop and deliver Java/Kotlin swap-processing components for Citi’s Strategic Swaps Platform. Responsibilities include test-driven development, automated testing, CI/CD, technical design, analysis, documentation, production support, reliability improvements, and collaboration across technology and business teams. The role also involves advising junior developers, contributing to Agile planning, resolving complex technical issues, and supporting continuous improvements to coding, testing, and deployment standards.

Develop and maintain Java-based market access gateways connecting Citi’s trading systems to EMEA exchanges. Translate internal trading messages, support application systems, troubleshoot issues, identify vulnerabilities, test and debug code, and implement enhancements. Collaborate with users and technology teams, provide application support, advise junior analysts, and operate independently while managing risk and compliance. The role also values Python, containerization, DevOps, Unix scripting, and low-latency coding experience.

Develop and maintain Java-based BDD test automation using Cucumber, execute API and database testing with SQL, and create test plans, cases, estimates, and regression suites. Identify and track defects, serve as a quality gate, investigate production issues, collaborate with development and business teams, and improve scalable QA processes. The role supports financial applications within Citi’s Equity Finance transformation program.