Top Software Engineer Jobs in Belfast

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.

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.

Join the 3D graphics team at Mapbox, working on open source vector map rendering, graphics programming, and improving performance for location technologies.

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 develop AI tools integrated with game engines and services, focusing on C++ and automation for game development.

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.

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.

As a Senior Software Engineer, you will develop technical solutions to complex business problems, participate in software solution building, and contribute to an engineering culture.

As a Senior Software Engineer, you'll lead backend and edge/IoT engineering, implement scalable solutions, mentor peers, and collaborate with teams to deliver impactful AI solutions.

Lead Software Engineer responsible for backend and edge/IoT engineering, mentoring teams, designing scalable solutions, and implementing CI/CD processes.

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.

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.

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.

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.

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.

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.

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.

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.

The Staff Software Engineer will develop backend services for Tide's AI platform, integrate components, ensure reliability, and shape AI engineering patterns.

As a Technical Lead, you'll oversee technical projects, mentor engineers, ensure high-quality solutions, and influence strategic decisions in a collaborative environment.

The role involves architecting and developing cross-platform libraries in Rust and other languages, contributing to both mobile and web applications. Responsibilities include delivering complex features and ensuring a cohesive user experience across platforms.

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.

Join a remote EU-based talent pipeline as a senior C++ engineer working on a custom engine or UE5. Maintain and develop game features and tools, collaborate across disciplines, and debug, profile, and optimize code for Windows PC strategy games.

Lead design and implementation of high-performance agent runtimes, backend services, and self-hosted model/agent infrastructure. Build low-latency execution systems, real-time data pipelines, telemetry loops, CI/CD for zero-downtime deployments, and ensure fleet reliability on AWS/EKS.