Top Software Engineer Jobs in Belfast

Lead design and implementation of scalable AI-centric systems for offensive security, develop agentic AI capabilities (LLMs, RAG), own feature lifecycle to production, mentor engineers, run design reviews, and integrate AI into microservice architectures with cloud, container, and messaging technologies.

Build and ship native Android features in Kotlin for an AI-enabled neobank. Design clean mobile flows for payments, insurance and financial services, integrate backend APIs, improve performance and reliability, use analytics and on-device ML (TensorFlow Lite) to enhance user journeys, and collaborate with product and design.

Design, implement, and maintain full-stack web features for a dairy farm management system. Own development lifecycle, ensure quality and reliability, support customers and technicians, and collaborate across cross-functional teams.

Lead quality engineering across the software lifecycle by designing scalable automated testing frameworks, developing API and UI automation, improving CI/CD testing infrastructure, researching AI-enabled testing approaches, defining test strategies and metrics, and mentoring engineers. The role requires strong programming, cloud, database, automation, and cross-functional collaboration skills in a hybrid Belfast fintech SaaS environment.

Build and maintain scalable, reliable agentic AI systems for biomedical research, integrating LLMs, tool-calling, and data platforms. Drive technical decisions, optimize analytical workflows, deploy agents on the data platform, mentor teammates, and participate in on-call rotation to ensure performance, security, and continuous improvement.

Analyze and optimize ClickHouse database performance, develop performance tests, support engineering teams, collaborate with core teams, and engage with the open-source community.

Lead the design and development of complex Rails features, mentor junior engineers, define technical direction, and ensure high-quality code while collaborating with stakeholders.

Design, build, and operate resilient Java and Spring Boot backend services for inventory availability, order promising, and fulfillment. Develop event-driven Kafka integrations, concurrency and consistency controls, caching strategies, observability, and graceful degradation mechanisms. Own services from design through production, optimize performance and reliability, integrate with commerce and enterprise platforms, conduct code reviews, document architecture decisions, and mentor junior engineers.

Own quality strategy, automated testing, and test execution for omnichannel commerce capabilities. Build scalable API, integration, contract, event-driven, and end-to-end test frameworks; manage complex test data; integrate quality gates and regression testing into CI/CD pipelines; define quality metrics; validate order, inventory, fulfillment, returns, and post-purchase workflows; and mentor engineers on quality practices and automation.

Own technical direction and hands-on execution for major products and systems. Design scalable, reliable architectures across backend, frontend, APIs, databases, and infrastructure; write code; lead architecture decisions; solve production problems; improve testing, security, observability, and development practices; and mentor engineers across teams.

Lead technical direction and hands-on execution for major products, systems, and engineering initiatives. Design scalable and reliable backend, frontend, API, database, and infrastructure solutions; write code; make architecture trade-offs; solve production problems; improve testing, security, observability, and development practices; and mentor engineers across teams.

Own technical direction and hands-on execution for major products and systems. Design scalable, reliable architectures across backend, frontend, APIs, databases, and infrastructure; write code; lead architecture decisions; solve production issues; improve engineering quality, testing, security, and observability; and mentor engineers across teams.

Build and scale production inference infrastructure and customer-facing APIs for AssemblyAI’s voice AI models. Partner with researchers and applied engineers to productionize model capabilities, transforming prototypes into reliable, low-latency, well-documented products. Contribute across backend services, SDKs, inference systems, and internal tooling while incorporating customer feedback into product and research direction.

Develop and maintain the backend ecosystem for the Alta Video Management System, focusing on cloud-based distributed systems and coding quality.

Lead the design and implementation of core authentication infrastructure at Phantom, focusing on secure authentication systems, secrets management, and API integrations.

As a Software Engineer, you'll develop trading APIs and systems, enhance user experiences, and lead initiatives for blockchain support and new products.

As a Software Engineer - L3 Support, you will resolve complex Ubuntu-related issues, collaborate with teams, and participate in upstream communities to drive bug fixes and improvements.

As a Software Engineer, you will resolve complex customer issues related to Ubuntu and open source software, participate in upstream communities, and develop and review code across multiple layers of the software stack.

Develop and maintain enterprise applications using Camunda BPMN, Java and Spring Boot. Implement front-end features with Angular/Vue/React, integrate microservices, use source control and IDEs, write documented and tested code, and work independently in cloud-based environments. Containerization and orchestration (Docker/Kubernetes) are advantageous.

Leads technical strategy and architecture for People and Labour systems, modernising Azure microservices, integrations, APIs, data flows, and SaaS platforms. Guides event-driven design, resilience, observability, CI/CD, security, and AI adoption. Mentors senior engineering talent, aligns technology with HR and workforce stakeholders, and makes enterprise-level build-versus-buy and architectural decisions across business-critical platforms.

Owns the technical strategy and roadmap for HR and workforce-management technology. Leads Azure microservices modernization, system architecture, APIs, event-driven integrations, SaaS integration, resilience, observability, incident management, CI/CD, and AI adoption. Partners with HR, payroll, workforce management, security, data, and product stakeholders to align technology with business goals. Mentors senior engineering talent and drives technical excellence across complex, business-critical systems handling sensitive workforce data.

Lead design and delivery of order management and promising services: build resilient APIs and integrations, own features end-to-end, improve observability and operational excellence, mentor engineers, and shape technical direction to enable accurate delivery promises and scalable fulfilment.

Design, build, and operate backend platform capabilities for content and media: federated GraphQL, event-driven pipelines, APIs, automation, and developer/editor tooling. Lead architecture, deliver production-quality code, and enable teams via scalable, reliable services.

The Staff Software Engineer will lead the design and delivery of robust order management solutions, ensuring reliability and scalability, while mentoring junior engineers and collaborating across teams.

The Staff Software Engineer will design and build backend platforms for content and media, develop APIs, lead architecture design, and act as a technical authority.