Top Software Engineer Jobs in Belfast

Lead architecture and technical direction across the full stack, solve ambiguous cross-cutting problems, deploy LLM-powered features into production, improve reliability and scale, mentor engineers, and make strategic build/buy and platform decisions that shape long-term product delivery.

As a Senior Software Engineer, you will develop and maintain Alpaca's platform services, including event streaming infrastructure and authentication systems, while ensuring software quality and reliability.

The Senior Software Engineer ensures the reliability and performance of the Mural editor, collaborates on technical projects, and designs APIs for real-time collaboration. Responsibilities include product engineering, mentoring, and improving team processes while focusing on performance and developer experience.

Lead decomposition of a PHP monolith into Go microservices, design and operate scalable distributed systems (Kafka, Temporal, OpenSearch, Memgraph), integrate network telemetry and third-party APIs, maintain Terraform-managed cloud infrastructure, enforce SLAs/SLOs and CI/CD quality, mentor engineers, participate in on-call rotations, and drive platform architecture and reliability.

The Senior Software Engineer II will design and implement generative AI services, drive architectural standards, mentor engineers, and collaborate across teams to enhance data solutions.

Lead the Market Making Engineering team in developing real-time quoting systems, collaborate with stakeholders, and enhance software and processes.

Lead architecture and implementation of Chainguard Repository services: build and operate high-availability backend systems in Go, design package registries and APIs, drive scalability, reliability, observability, and mentor engineers while partnering across teams to expand artifact support.

Lead technical direction and modernisation of customer platform systems; design, build and operate mission-critical services; drive DevOps, observability, performance and security; mentor senior engineers; influence product and technology strategy; promote engineering excellence, automation, and open-source engagement.

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.

Lead the development of software solutions for a logistics platform, overseeing technical strategy, mentoring teams, and ensuring high-quality software delivery.

Build and scale backend systems for a large social game. Design microservices and distributed systems, implement backend best practices, ensure reliability, security, and performance, collaborate cross-functionally, drive DevOps and testing, and continuously improve processes.

The role involves designing and maintaining scalable software platforms, troubleshooting complex problems, mentoring engineers, and establishing best practices to ensure software integrity.

Lead a small engineering team to deliver and operate large-scale Roblox game features. Drive technical planning, estimation, code quality, monitoring, releases, and mentorship while partnering cross-functionally to improve performance and player experience.

Design, build and optimise Python-based AI applications and data storage solutions. Collaborate with clients and teams, enforce code quality, CI/CD, testing practices, and deliver scalable production systems across cloud environments while travelling to client sites.

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.

Build and own end-to-end cloud partner integrations: design architecture (auth, multi-tenancy, data movement), implement backend systems, run and be on-call for infrastructure/CI/deployments, work with external platforms and internal teams, and write design docs to set team technical direction.

Develop reliable cloud services on the hyperscaler platform, contributing to cloud infrastructure, databases, and monitoring systems. Must write reliable code with team-oriented skills.

Manage and scale Kubernetes clusters, automate infrastructure, optimize performance, maintain blockchain nodes, and improve system reliability while collaborating with product teams.

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.

Lead technical design and delivery of supply chain and warehouse software at scale. Drive architecture, DevOps, observability, reliability and performance practices; mentor senior engineers; influence product and technology strategy; promote clean code and engineering excellence across teams; support recruitment and outreach.

Lead development of robust, scalable backend systems and integrations. Provide technical leadership, architecture and design, code reviews, mentorship, and operational excellence. Collaborate with product and business stakeholders, implement observability and testing best practices, and propose innovative solutions to improve performance, security, and customer service.

Work with experienced engineers to develop and support live-service mobile game features. Fix bugs, write clean C# Unity code, collaborate with designers/QA, and learn using mentoring and AI-assisted tools.

Design and evolve systems for Motion's infrastructure, focusing on reliable and secure operations across APIs, Linux systems, and cloud environments with a focus on hands-on coding and engineering judgment.

Design, build, and ship production-ready software; decompose ambiguous problems into system architectures; modernise legacy systems and develop greenfield features; own technical decisions, testing, observability, and documentation; collaborate with product and design and ensure operational readiness.

Lead architecture and strategy for Athena: build production-grade distributed systems that validate, deduplicate, and route vulnerability data; move prototypes to reliable, observable pipelines; set technical standards, scale the team, and partner on product and operational decisions.