Top Software Engineer Jobs in Belfast

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

Lead design and delivery of core platform systems for an AI-driven insurance ecosystem. Build scalable backend services, APIs, workflow engines, and integration layers; define standards for reliability, observability, and extensibility; mentor engineers; collaborate with product, operations, QA, and DevOps; own production stability, incident response, and reliable releases.

Lead technical direction and modernise international commerce platforms. Design scalable integrations for product, pricing, fulfilment, partner/marketplace flows. Promote engineering excellence, DevOps ownership, observability, and mentor teams while aligning technology strategy with business goals.

As a Software Development Engineer II, you will develop and maintain web services for navigation solutions, ensuring reliability and performance while collaborating with the team.

The Senior Software Engineer will focus on backend development, designing and maintaining APIs and services, collaborating on features, and enhancing integrations at Motion.

As a Staff Unity Client Engineer, you will own game features and collaborate across teams for high-quality game client development, focusing on full lifecycle responsibilities.

Design and build an internal AI enablement platform and developer tooling. Implement Microsoft identity/authentication integrations, prototype and productionize LLM-driven workflows, use AI-assisted development (Claude), collaborate with execs and cross-functional teams, and ensure secure, observable, maintainable platform delivery.

As a Senior SDET, you will enhance testing practices, improve CI pipelines, mentor engineers, and ensure platform reliability through comprehensive testing strategies.

The Staff Engineer will enhance developer workflows and platforms, focusing on local development, integration of AI in SDLC, and collaboration to improve CI/CD and productivity metrics.

The Staff Software Engineer will develop AI tools integrated with game engines and services, focusing on C++ and automation for game development.

This role involves enhancing Firefox development workflows, mentoring team members, and improving integration and automation processes while working in a distributed team.

The Staff Software Engineer will lead a team in developing cloud-enabled products, manage technical design, mentor junior engineers, and enhance G-P's platform with integrations and API management.

Lead design and development of scalable full‑stack solutions for Warehouse Continuity in Supply Chain. Provide technical leadership, architecture, code reviews, mentorship, DevSecOps adoption, observability, and modernisation of integrations and legacy systems while collaborating with product and business stakeholders to ensure performance, security, and operational excellence.

Lead design and development of scalable full‑stack systems and integrations for supply chain/transport. Provide technical leadership, code review, mentorship, DevSecOps implementation, observability, and stakeholder collaboration to ensure robust, secure, and performant solutions.

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.

Senior Software Engineer will be a founding member of a Learner Experience pod owning end-to-end delivery: discovery, solution design, production, iteration and outcome measurement. Work across full stack with strong front-end/UX focus, use AI-assisted development, uphold TDD and code review standards, coach peers, and collaborate closely with non-technical stakeholders to shape impactful edtech features.

Develop and maintain high-concurrency C# services for real-time emergency call-taking and dispatch. Implement SIP signaling, RTP/RTCP media handling (MCPTT/MCVideo), MCData handlers, XCAP/XML processing, and secure media via OIDC and MIKEY-SAKKE. Work in an Agile team, apply asynchronous network programming, and contribute to CI/CD workflows.

Lead backend and edge/IoT engineering, implementing scalable solutions and mentoring team members while collaborating with Data Science teams.

The Senior Full Stack Engineer will design, build, and own scalable SaaS applications, focusing on performance, reliability, and future-ready architectures, while mentoring engineers and collaborating with Product and Design teams.

Lead Systems Engineer responsible for designing, implementing, and maintaining PLC/SCADA automation systems, industrial networks, and OT cybersecurity. Provides technical leadership, mentors teams, oversees system architecture, commissioning, risk assessments, and vendor/client coordination to deliver secure, standards-compliant projects on time and within budget.

Build and operate a managed PostgreSQL service for AI workloads: develop control plane and lifecycle automation in Go, tune PostgreSQL internals and ecosystem tooling, create migration tooling, integrate vector search, run SRE practices (SLOs, observability, incident response), and work directly with customers on architecture and escalations.

The role involves building production-grade software for AI-driven IT solutions, focusing on backend services, architecture, and direct customer engagement.

Design and develop software solutions from scratch, collaborating on government projects, and participating in the software development lifecycle.

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.