Top Software Engineer Jobs in Belfast

As a Software Engineer II at Affirm, you will develop backend systems, collaborate with product teams, and support operations, ensuring timely project delivery while fostering team engagement and growth.

Develop and maintain high-volume exchange connectivity software, work within an agile team, write efficient code, and mentor team members.

The Senior Software Engineer will develop and maintain backend systems for Apex's Margin product, focusing on scalability, performance, and collaboration with cross-functional teams. Responsibilities include backend development, microservices engineering, API design, and mentorship of junior engineers, ensuring secure and efficient solutions for financial systems.

The Senior Software Engineer will design and build backend services for health data, improve reliability, and deliver robust solutions to enhance patient care.

The Software Engineer will build customer-facing products for healthcare, focusing on full-stack feature development and user experience, while engaging with customers and iterating on the product based on feedback.

Design and implement billing systems while optimizing performance and mentoring engineering teams. Collaborate with finance and compliance to translate business needs into technical solutions.

Senior engineer responsible for end-to-end delivery of scalable, reliable features. Design and implement Python-based services, work with Kubernetes and cloud platforms, contribute to architecture, champion testing/monitoring, and mentor junior engineers while partnering with product and UX teams to meet customer needs.

The role requires training large language models to improve code quality, involving code review, ranking, and feedback integration for reinforcement learning.

As a Software Engineer, you'll train large language models to write quality code, review code snippets for performance and correctness, and provide feedback for ongoing improvements in a remote, independent contractor role.

The role involves training large language models to improve code quality by reviewing and refactoring AI-generated code, providing feedback to enhance the learning process.

The engineer will train large language models to write code, review and refactor AI-generated code, and inject feedback into a reinforcement learning pipeline.

The Software Deployment Engineer will oversee Guardian deployments, ensuring alignment with requirements, capturing customer needs, and integrating solutions, alongside documentation and stakeholder communication.

Responsible for setting technical strategy, collaborating across teams on backend systems, ensuring operational reliability, fostering team culture, and developing team talent.

As a Software Engineer II, you will build and maintain features on Stora's Rails-based platform, improve app stability, and collaborate with a small team on various domains.

The role involves developing software solutions for credit risk management, applying cloud principles, and enhancing business processes while ensuring compliance standards.

Seeking a Senior Software Engineer for designing, developing, and maintaining software solutions; focusing on billing platforms and collaboration across teams.

The role involves training large-language models to improve code generation, reviewing and editing AI-generated code, and providing feedback for reinforcement learning refinement.

As a Software Engineer, you will help train large language models by ranking and repairing code, ensuring correctness and efficiency while providing feedback to enhance training processes.

As a Software Engineer, you will help train large-language models in code evaluation and training, focusing on Ruby, with an emphasis on code review and improvement.

Responsible for training large-language models by reviewing, ranking, and improving AI-generated code. Requires strong software engineering skills.

Develop and deploy AI-powered applications, collaborate with data scientists, drive improvements, and mentor team members in a full-stack environment.

Develop and maintain the SystemOperations application suite and own platform infrastructure for OT/IT environments. Implement IAM, device credential workflows, MQTT optimization, containerized deployments, GraphQL/SQL services, and Angular components while ensuring security and IEC-62443 compliance.

Build and evolve device and service monitoring for OT systems: design data ingestion, time-series structures, dashboards, alerting, logging and audit trails aligned with IEC-62443; develop backend services with NestJS, contribute to Angular dashboards, integrate devices, improve data quality, and enable ML-ready analytics for anomaly detection and predictive insights.

Develop and maintain SystemOperations applications (NestJS, Angular, GraphQL, SQL, MQTT). Own and improve CI/CD pipelines, release automation, tooling (GitHub, Atlassian, Nexus, SonarQube), environment administration, and observability while ensuring IEC-62443 security alignment and cross-functional collaboration.

Citi seeks a Senior Software Engineer (Java) to design and develop complex, high-performance systems for fixed income trade processing, utilizing Java and Spring technologies.