Top Software Engineer Jobs in Belfast

Work on YDB distributed storage and database systems to maximize performance on modern and legacy hardware (NVMe, HDD, DPUs). Reengineer components for low-latency, high-throughput workloads, profile and debug production systems, and design resilient distributed storage primitives. Collaborate on incident resolution and production deployments to support Nebius cloud services.

Build and maintain a distributed, fault-tolerant, high-performance block and filesystem storage system. Work on virtualization (virtio-blk, virtio-fs, QEMU, vhost-user), high-throughput VM-to-storage networking (TCP, RoCEv2/RDMA), and core storage features like replication, consensus, self-healing, and data migration. Debug and optimize performance-critical I/O paths while writing reliable, maintainable code in a collaborative team environment.

Design, develop, and maintain secure, scalable backend services and mobile SDKs for payment device integrations. Lead architecture, improve CI/CD and testing, mentor engineers, ensure security and compliance (PCI/OWASP), investigate performance issues, participate in on-call rotation after onboarding, and collaborate cross-functionally to deliver reliable payment solutions.

Lead analysis and resolution of system performance issues across Akamai's distributed Linux platform. Design and implement scalable software and tools for performance detection, mentor engineers, and collaborate across teams to deploy efficient solutions.

Lead design and development of Windows desktop applications. Ensure performance, maintainability, and accessibility, while driving feature lifecycle and collaborating cross-functionally.

Join a collaborative development team to design, implement, and maintain SaaS solutions, writing clean code and participating in Agile methodologies.

A mid-level C# .Net Back End Software Engineer responsible for the software development lifecycle, collaborating with teams, and maintaining software applications with a focus on Azure cloud services.

Develop microservices and cloud services for Magnify's platform, collaborate with data science, and lead complex software projects in a startup environment.

Join the Guardian test team to design, execute and maintain manual and automated test suites for a critical call-taking and dispatch platform. Participate in Agile sprints, create detailed bug reports, support release and on-site customer testing, and collaborate with developers to ensure product quality. Drive automation efforts and help improve test strategies and processes.

The Senior Software Engineer will develop features for Phantom's web platforms, lead new product initiatives, interface with users, and contribute to team culture.

The Sr. Software Engineer (FE) will lead the development of scalable frontend applications using React. Responsibilities include systems design, testing strategy, performance optimization, AI integration, and mentoring.

Ownership of backend Loyalty platform services: design, build, deploy, monitor and optimise scalable, distributed systems. Collaborate across teams to shape technical direction, improve developer experience, and maintain reliability, observability and operational excellence for customer-facing Sparks journeys.

Develop, optimize, and upstream hardware-accelerated video encode/decode/transcode pipelines on Intel graphics using Quick Sync, oneVPL/VPL, VA-API and D3D backends; engage with open-source communities and ISVs, perform performance and quality analyses, author patches and technical content, and advise Intel product teams to improve media solutions.

Develop, prototype, and optimize Vulkan-based GPU compute solutions across Windows, Linux, and ChromeOS. Work with ISVs, open-source communities, and internal teams to profile, debug, and tune workloads on Intel platforms, provide technical consultation and documentation, and influence hardware/software architecture to improve performance and adoption across client systems.

The Senior Software Engineer will lead technical decisions, mentor colleagues, and develop scalable web applications using C#, .NET, and SQL. Responsibilities include ensuring quality delivery and implementing best practices in code and CI/CD.

Design, prototype, and maintain high-performance systems software with emphasis on firmware, device drivers, hardware interfaces, and real-time communication (WebRTC/WebSockets/REST). Debug and resolve low-level issues, collaborate with cross-functional teams, participate in code reviews, ensure security and compliance, and contribute to continuous improvement and POCs.

Lead the design and implementation of scalable, distributed systems, focusing on Reporting and Insights applications for clients. Guide software initiatives, mentor team members, and drive engineering best practices.

Build and maintain internal Web Platform tooling and libraries used by M&S engineering teams. Own end-to-end platform features, improve CI/CD, monorepo health, testing, observability, and reliability. Mentor engineers, collaborate across teams, and operate platform services with a production-first mindset.

Build and evolve web platform capabilities — shared tooling, libraries, CI/CD and monorepo architecture — to improve developer productivity. Set technical direction, own architecture decisions, collaborate with teams, and mentor engineers.

Lead technical direction and deliver large-scale authentication systems (OAuth/OIDC/SAML/LDAP/SCIM) in Go. Drive cross-team architecture, mentor senior engineers, ensure low-latency multi-tenant reliability, and represent Grafana in the identity community.

Senior backend engineer role building scalable, resilient Go-based backend services and APIs for cloud environments (AWS/Azure/GCP). Work with containers, Docker, Kubernetes, TDD, and performance optimisation while collaborating with client teams in a remote-first consultancy.

Design, build, and optimize high-performance AI infrastructure systems to support intelligent agents, ensuring reliability and scalability for millions of users.

The Senior Software Cybersecurity Engineer analyzes software for security, performs threat modeling, leads security efforts, mentors teams, and integrates security throughout the development lifecycle.

The Staff Software Engineer will lead the design and development of a scalable network data platform for Confluent Cloud, focusing on performance, reliability, and security while managing complex software projects across teams.

Lead the architecture of Tide's agentic platform, ensuring reliable, scalable services. Collaborate across teams to design APIs and integration standards, focusing on developer experience and analytics.