Top Software Engineer Jobs in Belfast

As a Principal Engineer at M&S, you'll drive technical strategy, influence architecture, and mentor engineers while delivering on personalization, search, and machine learning features in collaboration with cross-functional teams.

Develop and optimize performance-critical components of a low-latency trading platform (pricing engines, gateways, market-data, messaging). Own design, deployment, production support, observability, and architectural decisions. Mentor engineers, conduct reviews, and ensure reliability in cloud-native AWS and colocated environments.

Build and maintain low-latency trading infrastructure on Linux using modern C++ and Go. Work on pricing engines, connectivity, market-data pipelines, FIX integrations, messaging, observability, and production support. Own design, deployment, incident response, and continuous performance optimization.

Lead design and delivery of scalable, secure payment platform capabilities across stores and digital channels. Own end-to-end payment product outcomes, ensure reliability, security and performance, implement SRE/DevOps and CI/CD practices, drive observability and incident management, shape architecture, mentor engineers and promote engineering excellence.

Lead quality engineering for POS and Self-Checkout platforms: define quality strategy, build scalable test automation, drive CI/CD and observability, mentor engineers, support production releases and incident investigations to improve platform reliability and performance.

Lead technical strategy and architecture for personalization, search, and recommendation systems. Deliver scalable ML-powered features, mentor senior engineers, and improve engineering quality across cross-functional teams.

Lead design and delivery of scalable, secure payment platform capabilities. Own reliability, performance and resilience, drive DevOps/CI-CD, observability and incident management, and mentor engineers to improve platform engineering practices.

Lead QA for retail platforms (POS, Self-Checkout), shape quality strategy, build scalable test automation, drive operational excellence, mentor engineers, support CI/CD and production releases.

Design, implement, and ship customer-facing AI features end-to-end. Architect scalable, secure systems for high-volume data and complex workflows. Improve grounding, citations, and evaluation for auditable AI outputs. Collaborate with Product and Design to iterate and optimize latency, cost, and user experience.

Advance Firefox security architecture and cryptography stack by designing and implementing web platform security features. Improve browser reliability, performance, and memory efficiency. Debug and resolve security-sensitive, multi-threaded issues, contribute to standards-based implementations, and collaborate across teams on security initiatives, technical design, and planning.

Lead design, development and maintenance of scalable, secure international pricing platforms and integrations. Provide technical leadership, conduct code reviews, champion DevSecOps and automated testing, mentor engineers, and drive observability, incident management and operational excellence across cloud-native systems.

Lead design and build of scalable, secure international pricing platforms and integrations. Provide technical leadership, code reviews, DevSecOps practices, observability, mentoring, and collaborate with product and stakeholders to deliver robust backend systems for multiple markets and channels.

Design, build, and maintain production-grade microservices and web applications to power personalization and recommendations. Implement model-serving and inference integrations, ensure resiliency, observability, and low-latency performance, work with event-driven and caching patterns, collaborate with AI/ML and data teams, drive technical designs, mentor engineers, and operationalize services for production readiness.

Design, build, and operate scalable web applications, APIs, services, and AI-enabled workflows. Use AI tools across the development lifecycle, ensure reliability, performance, and observability, contribute to technical decisions, iterate from user feedback, and own production quality and delivery as part of cross-functional squads.

Design, develop, and support scalable software solutions using TypeScript, JavaScript and Angular. Work independently in an Agile team, write clean code and unit tests, troubleshoot performance and integration issues, collaborate with product and stakeholders, and contribute to continuous improvement and AI-enabled initiatives.

Senior Software Engineer on the Customer Analytics Engineering team building scalable backend services in Java (JDK11+). Design, develop, and maintain analytics platform features, optimize SQL for MySQL and Snowflake, troubleshoot production issues, improve architecture and performance, participate in code reviews, mentor teammates, and drive modernization and technical debt reduction.

Build internal AI enablement tools, workflows, and guardrails to help engineers use coding agents safely and productively. Evaluate models and agents, partner with teams to apply AI, track adoption and impact, and provide documentation, training, and advocacy across the engineering organization.

The Solutions Engineer will support the integration of Near Intents, assist developers, enhance product stability, and provide technical support to ecosystem partners.

Senior full-stack product engineer owning large product areas end-to-end: research, write specs, design wireframes, implement features across frontend and backend, and collaborate closely with product, design, and infra. Focus on solving customer problems, building durable abstractions, and shipping high-quality, scalable software.

Senior full‑stack product engineer owning a large product area end-to-end: research customers, write specs and wireframes, design and implement features across frontend and backend, collaborate with product and design, and ship high-quality scalable software.

Build, ship, and operate Cloudbeds' POS: work across React Native/Expo frontend, Python/FastAPI backend, PostgreSQL, synchronization/offline patterns, and cloud-native infrastructure (Terraform, Kubernetes, Argo CD). Own API design, reliability, testing, observability, production support, and cross-team collaboration to deliver dependable, scalable POS experiences for hospitality.

The role involves leading compliance quality initiatives, designing test automation frameworks, collaborating with teams, and ensuring compliance in software development.

Owner of backend APIs and platform primitives enabling customer onboarding, entitlements, and policies. Design and build Go-based REST/gRPC services, integrate across teams, extend AI into customer experiences, mentor engineers, and drive features end-to-end from design through rollout.

Design, build, test, and operate IAM and platform services across the stack. Implement APIs, models, workflows, and orchestration surfaces. Research and prototype AI agent identity solutions, collaborate with product and UX, participate in design, coding, testing, rollout, and production support, and mentor other engineers.

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.