Top Backend Jobs in Belfast

Manage a cross-functional engineering team building GitLab Duo Chat's AI-powered features. Define requirements with product and UX, contribute to architecture for scalable agentic AI, drive delivery and roadmap execution, improve testing, observability, performance, and coach engineers to foster an inclusive, high-performing team.

Design and deliver end-to-end features for DAP onboarding and repository/background flows. Build autonomous and scheduled agents that act on customer codebases, improve onboarding experience, collaborate on shared interfaces, review code and designs, and contribute to an async-first, distributed team's technical quality and ownership culture.

Design, build, and operate the high-availability event and trigger system that links GitLab and third-party events to AI-powered Duo Flows. Work in GitLab's Rails monolith, scale for high throughput, influence architecture, add trigger types, collaborate cross-functionally, and participate in Tier 2/3 on-call rotations to troubleshoot production issues.

The Senior Software Engineer will lead the development of backend systems for payment processing, collaborating with teams, setting goals, and fostering quality and ownership in code development.

Lead and unify the agency's design technology practice, managing engineering teams, delivery across multiple engagements, technical strategy, architecture, standards, prototyping, AI-assisted tooling, and cross-disciplinary collaboration with designers and clients to ensure consistent, high-quality outcomes.

As a Staff Backend Engineer at GitLab, you'll enhance backend infrastructure for CI, integrate AI features, and ensure reliability and performance in CI/CD workflows.

The Backend Software Engineer will manage the lifecycle of short-term projects, perform reliability analysis on applications, and interface with teams to deliver features.

As a Senior Backend Engineer at DuckDuckGo, you'll lead backend projects, mentor engineers, and develop AI-enhanced features for the company's privacy-centric product line.

Build and maintain backend AI capabilities for GitLab Duo Chat: design flow components and agentic flows in Python/LangGraph, integrate LLMs and multi-agent orchestration, implement and maintain APIs in the Rails monolith, improve observability and reliability, and participate in on-call rotations and cross-functional collaboration to deliver safe, scalable AI chat features.

Build tooling, workflows, and guidance to make GitLab easier to deploy, validate, and operate across cloud-native and self-managed environments. Evolve deployment guidance, improve production-like ephemeral environments, and maintain consistent deployment artifacts and environment contracts across development through production.

Senior PHP backend engineer to develop and maintain the Xodo Sign eSign platform. Work in a Scrum team across requirements, design, implementation, testing, and maintenance; build and scale REST APIs; optimize performance and security; perform code reviews; research and propose product enhancements; and promote engineering best practices.

Build and operate distributed backend services and genomic reasoning engines that combine whole genome bioinformatics with AI. Design scalable data models, retrieval and vector search systems, and deterministic guardrails to ensure scientifically accurate, explainable genomic AI for production use.

As a Backend Software Engineer, you'll develop and maintain REST APIs using Django, manage cloud infrastructure, and oversee CI/CD pipelines to support consumer fintech applications.

The Backend Engineer will implement new SDK and Indexer features, automate testing, support integration, and oversee production releases.

The role involves owning product feature development, participating in system design, and maintaining software performance in an agile setting.

The Senior Staff Backend Engineer will lead technical direction for systems, manage engineering standards, mentor teams, and ensure alignment with broader company goals. Responsibilities include hands-on coding, architecture, and partnership with product teams to maximize impact.

As a Senior Backend Engineer, you will collaborate with cross-functional teams to build resilient software and support various banking operations using technologies like Go and Kubernetes.

As a Staff Backend Engineer, you will collaborate across teams to build and improve backend systems using various technologies, focusing on customer-centric solutions and resilient software.

Own end-to-end features across Java backends and a TypeScript/Angular frontend for a multi-tenant SaaS platform. Design APIs, schema and queries (MySQL/ClickHouse), build performant UIs, write unit/integration/e2e tests, deploy via containers/CI-CD, and integrate LLM/agentic workflows to help users find and fix data quality issues.

Build and own backend services and APIs in Java for a multi-tenant SaaS. Ship end-to-end product features, operate services on AWS/EKS and Kubernetes, improve reliability, scalability, CI/CD/GitOps, observability, and platform tooling that enables agentic development. Drive architecture and work directly with product and customers.

Design and build distributed backend services for the cloud monetization platform, focusing on correctness, consistency, scalable microservices, distributed transactions, and reliable asynchronous workflows. Influence system architecture, own service implementations, and collaborate across teams to support billing, reservations, payments, and revenue flows.

Remote junior backend developer who troubleshoots and analyzes code/data, helps design new features, records/reporting, and pursues ongoing training to stay current with best practices and languages.

Design and implement backend solutions using Umbraco and Microsoft .NET. Build back-office editors and templates, integrate RESTful APIs and third-party services, implement job search features, ensure performance, security, and test coverage, and collaborate in an Agile/Scrum team.

Design, develop, deploy, and maintain backend services using Django and Python. Implement RESTful APIs, task automation with Celery, microservices integrations, CI/CD deployments, and ensure security, performance, and maintainable code while collaborating with frontend teams and stakeholders.

Design, upgrade, and maintain scalable back-end systems for a cloud-based accounting platform. Develop Java services, implement AWS solutions (CDK, Lambda), and solve complex backend challenges to deliver high-impact, globally used features.