Top Backend Jobs in Belfast

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.

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.

Ownership of backend features for Agentic Tools: design and implement GraphQL/REST APIs, build secure scalable Ruby on Rails services, improve RSpec automated tests, collaborate across product and AI teams, participate in Tier 2 on-call, and shape architecture for AI agent interactions with GitLab.

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.

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.

The Senior Backend Engineer will develop reliable cloud services, engage in teamwork, and address complex challenges primarily using Golang, Java, and Python.

Work as a senior backend engineer on cross-functional teams building APIs, tools and integrations. Design, ship and maintain secure, reliable, scalable production systems; propose and implement agentic/automation workflows with verification loops; participate in code reviews, mentoring, support rotations, and cross-team initiatives; contribute to platform improvements, observability, and product feedback.

As a Backend Engineer, you will design scalable APIs, create Engineering Requirement Documents, and build test suites for product analytics and performance.

The role involves leading the mk8s Core Team, managing technical projects, coaching engineers, and participating in hands-on coding and incident response.

The backend developer will build backend software focusing on reliable APIs, ensure high-quality output, and collaborate with teams.

As a Senior Python Backend Engineer at VidRush, you'll build AI-driven video production systems, ship production-level ML/LLM services, and work closely with product teams while ensuring high autonomy and delivery speed.

Build and scale core observability services for high-volume telemetry ingestion, distributed storage, query engines, alerting pipelines, and AI-assisted troubleshooting. Work on reliability, performance, and production incident resolution across a cloud AI platform.

Develop and maintain the backend ecosystem for the Alta Video Management System, focusing on cloud-based distributed systems and coding quality.

Design, build, and maintain backend services, APIs, and integrations using Elixir/Phoenix and Postgres. Lead team-scoped projects, propose and implement agentic/automation workflows with verification loops, participate in cross-team initiatives, mentor engineers, perform code reviews, debug production issues, and contribute to platform improvements and CI/CD-driven deployments.

The Senior Back-End Developer builds and maintains server-side operations for cloud solutions, collaborating with teams to deliver software, support users, and document features.

Design, build and operate backend services in AWS for a multi-service hospitality platform. Implement new features, payment and EPOS integrations, improve performance, monitoring and deployment automation using TypeScript/Node.js and databases like Mongo Atlas, Postgres RDS or DynamoDB. Collaborate in a UK development team and automate infrastructure, CI/CD and QA.

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

As a Backend Engineer, you will build scalable and secure backend solutions, contribute to innovative projects, and uphold high security standards.

Build and maintain backend services and APIs for onboarding, accounts, payments, cards, transfers, rewards, FX, KYC and risk. Design reliable, secure, observable systems that handle real customer transactions at scale, integrate with partners and AI services, and improve operational workflows through automation.

As a Senior Backend Engineer, you'll develop features using Python and various AWS services, focusing on AI-driven solutions for the insurance sector.

Build and scale backend systems for a managed cloud platform: design APIs, database schemas, optimize queries, ensure reliability, security, observability, and contribute to architecture and developer SDKs. Work with open source community, write docs, and participate in product-led growth activities.

Design, build, operate, and maintain scalable alerting backend systems. Drive features end-to-end, contribute to open-source, participate in on-call rotations, mentor teammates, and collaborate remotely to improve reliability, performance, and alert evaluation at scale.

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

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.