Top Software Engineer Jobs in Belfast

Design, build, and operate high-performance platform services for SailPoint’s Identity Security Cloud. Develop Golang microservices, Angular and TypeScript features, automated tests, and AWS-based distributed architectures. Collaborate with data scientists on AI-driven capabilities, optimize low-latency services and databases, improve CI/CD pipelines, participate in a 24x7 on-call rotation, and contribute to technical design, mentoring, and platform strategy.

Build and maintain Ruby on Rails backend features for vulnerability management, including security dashboards, reports, and ingestion pipelines. Improve system performance, reliability, and scalability; collaborate across backend, frontend, product, design, and security teams; review code; address technical debt; and participate in on-call rotations. The role requires relational database experience, distributed-team collaboration, technical problem-solving, and contributions across the stack when needed.

Collaborate on designing, developing, testing, debugging, and maintaining software applications. Write efficient, documented code, participate in code reviews, contribute software ideas, and learn development tools, frameworks, methodologies, and industry practices alongside senior developers.

Join the International Accelerator full-stack team to design, build, and operate Direct-to-Consumer products across international markets. Break projects into tasks, collaborate with PM/design/analytics, build and monitor APIs and web apps, support on-call and availability, participate in hiring and team growth, and write clear, well-tested, maintainable code.

Architect and deliver resilient, high-performance cloud services for SailPoint’s identity platform using Golang and Angular. Design synchronous and event-driven microservices, build scalable SaaS features, improve performance and reliability, conduct architecture and code reviews, and mentor engineers. The role includes collaboration with product and architecture teams, participation in a 24x7 on-call rotation, and leadership across Policy Engine and agentic identity initiatives.

Design, build, deploy, and operate full-stack microservices for SailPoint’s Policy Engine. Develop scalable distributed systems using Golang and Angular, write unit and integration tests, debug and profile complex services, participate in on-call support, lead design reviews, mentor engineers, and contribute to technical roadmaps and architectural initiatives.

Build and provide technical direction for Mission Control, an enterprise interface and API platform for deploying, monitoring, and controlling AI security agents. Develop React and TypeScript full-stack applications, integrate designs, define API contracts, automate deployments and testing, and support cloud-native systems. Collaborate across product and engineering teams, mentor engineers, manage stakeholders, improve accessibility and front-end security, and participate in on-call rotations.

Designs and develops components of Satori, Proofpoint’s enterprise AI agent platform. Responsibilities include building agent runtimes and SDKs, creating evaluation suites, safety checks, telemetry, and authentication controls, transforming integrations into reusable platform capabilities, and supporting production-grade microservices. The role involves debugging distributed systems, cloud-native deployment automation, architectural collaboration, mentoring, and participation in an on-call rotation.

Build features and production services for Proofpoint’s Satori enterprise AI agent platform. Implement agent runtimes and SDK components, contribute to evaluation suites, safety checks, telemetry, authentication, release readiness, and rollback processes. Collaborate with senior engineers, debug services, support cloud-native microservices, ship production code, and participate in an on-call rotation.

Own and evolve GitLab’s authorization systems across its Ruby on Rails monolith and next-generation Rust policy engine. Design fine-grained permissions for users, tokens, roles, and AI agents; secure GraphQL and REST APIs; lead feature-flagged rollouts and migrations; improve performance and reliability; and collaborate across authentication, platform, AI, and modular-service teams in a distributed asynchronous environment.

Design and develop scalable, secure frontend web applications for connected embedded systems. Lead frontend architecture, collaborate with backend/embedded teams, implement device provisioning, telemetry visualization, and remote management UIs. Optimize performance, accessibility, and maintainability; mentor engineers, participate in reviews, and drive frontend best practices.

Set long-term technical strategy for backend identity systems, lead major distributed-system initiatives, ensure operational availability, establish engineering quality standards, collaborate cross-functionally, and mentor engineers. Build and launch highly available systems supporting international expansion, KYC verification, identity data management, decisioning, regulatory compliance, and global risk models.

Build and operate full-stack features for elastic.co using React, TypeScript, and backend services. Own deployment pipelines, performance monitoring, observability, security vulnerability remediation, production troubleshooting, code reviews, and on-call support in a globally distributed team.

Develop and scale software supporting Firefox’s build, test, and release pipelines. Improve developer experience through release automation, collaborate with distributed engineering teams, participate in code reviews, maintain existing tools and codebases, and respond to critical service outages during normal working hours.

Design and build distributed systems for a high-performance CI/CD execution platform. Responsibilities include orchestrating Supabase Branch lifecycle operations, provisioning ephemeral sandboxed environments on AWS, scheduling concurrent builds, optimizing pipelines through caching and artifact reuse, handling retries and failures, instrumenting observability, and developing configuration and infrastructure integrations. The role requires strong Go and TypeScript skills, cloud infrastructure experience, and a production operations mindset.

The Software Engineer will design, develop, and maintain backend services and APIs for Speechify, ensuring they meet business and scalability requirements. The role involves collaboration on B2B solutions and aligning backend architecture with product strategy.

Designs and delivers scalable AI-centric software for offensive security, including agentic vulnerability detection, automated penetration testing, workflow optimization, and threat intelligence. Owns features from ideation through deployment and monitoring, contributes to architecture and testing, and collaborates across teams. Requires Python or Go, AI technologies, microservices, APIs, messaging, databases, Docker, Kubernetes, and cloud experience.

Design, develop, test, deploy, maintain, and enhance enterprise IoT software products. Contribute to the architecture of a global multi-cloud, multi-region platform, enforce SDLC and DevSecOps practices, support CI/CD pipelines, conduct technology research and proofs of concept, and provide technical leadership, mentoring, and direction. Collaborate with partner teams to deliver scalable, secure, reliable systems that enable real-time IoT monitoring and data-driven decision-making.

As a Software Engineer II, you will build and maintain features on Stora's Rails-based platform, improve app stability, and collaborate with a small team on various domains.

Develop and enhance web-based digital farm management solutions for the dairy industry. The role involves designing maintainable software, contributing across the full development lifecycle, supporting users and technicians, testing and optimizing applications, and collaborating with developers, testers, and product managers. The position uses Java, Spring, TypeScript, Angular, PostgreSQL, Docker, and Azure-based development tools in a hybrid Belfast environment, with occasional international travel.

Build and architect Base360.ai: design and launch booking, pricing, payments, operations, and AI-powered automation. Integrate platforms (Airbnb, Stripe, Twilio, OpenAI), scale systems internationally, and embed AI workflows to automate operations and optimize revenue.

Build and own backend systems for card issuing, payments, reconciliation, double-entry accounting, webhooks, API versioning, and compliance workflows. Responsibilities include making architectural decisions, writing RFCs, delivering features from customer problem to production, monitoring and debugging live systems, improving engineering practices, and mentoring teammates. The role requires strong distributed systems and software fundamentals, functional programming or fintech expertise, and comfort working autonomously in a collaborative startup environment.

Build and maintain production-grade iOS applications using Swift and SwiftUI, integrating AI through backend APIs. Design reliable AI interaction patterns, optimize performance and memory, support concurrency and background tasks, capture user feedback, and collaborate with backend and machine learning engineers. Maintain App Store quality, monitor production issues, and deliver responsive, stable, and efficient user experiences.

Design and maintain automation solutions for contact centre platforms and integrations. Build and maintain automated functional, API, integration, regression and end-to-end tests; embed testing in CI/CD; review requirements for quality risks; investigate defects; support release readiness and continuous improvement while engaging stakeholders.

Own end-to-end design, development, deployment, and support of CreatePay’s AWS-based PayFac and acquiring platform. Design resilient distributed, event-driven, serverless systems; build APIs and integrations with payment, KYC/KYB, fraud, and banking providers; develop data models and pipelines; and ensure secure, PCI-aware, observable infrastructure. Act as a technical partner to the CTO and de facto product owner, independently defining scope, validating third-party work, and applying AI and automation to improve delivery.