Top Software Engineer Jobs in Belfast

Develop backend software in C# .NET within an agile delivery team. Responsibilities include system design, coding, technical documentation, automated testing, collaboration with product managers and test engineers, and maintaining high-quality mission-critical software. The role is remote with occasional travel and supports a UK emergency call-taking and dispatch platform.

Build and scale Base360.ai’s short-term rental platform, including customer-facing applications, APIs, automation engines, AI-powered workflows, third-party integrations, and cloud infrastructure. Develop systems for reservations, pricing, payments, guest communication, property operations, reporting, and financial workflows. Own projects end to end, make architectural decisions, ensure reliability, and deliver scalable products in a remote-first startup environment.

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.

Lead full-stack engineering initiatives across architecture, development, testing, reliability, performance, and security. Provide technical leadership, establish coding standards, conduct code reviews, mentor engineers, champion AI-assisted development, resolve complex technical issues, and partner with Product Management to deliver solutions within a .NET-based environment.

Contract software engineering role for a remote Europe-based engineer building scalable, resilient backend products with client teams. Responsibilities include backend development in Go, API and SaaS platform development, cloud infrastructure, distributed systems, containerized deployment with Docker and Kubernetes, testing with TDD, and performance optimization. The role also involves technical communication, collaborative problem-solving, and thoughtful use of AI tools.

Lead quality engineering for membership and loyalty capabilities, designing and executing functional, integration, API, contract, automation, and end-to-end tests. Build reliable test suites, validate loyalty points and personalized recommendations, manage test data, ensure cross-browser and cross-device quality, define testing strategies, and improve coverage using AI-assisted tools. Collaborate with engineering and product teams throughout the software development lifecycle while leading quality engineers in the loyalty and personalization area.

Build and optimize high-performance Elixir/Phoenix backend systems with PostgreSQL at scale. Design efficient schemas, queries, indexes, batching strategies, migrations, and concurrency patterns. Diagnose database bottlenecks, support large document volumes, and improve reliability across cloud and self-hosted deployments. Contribute to AI-assisted engineering workflows, platform architecture, tooling, and customer success while collaborating with a remote-first team.

Develop and support scalable Java and Spring Boot backend microservices powering omnichannel inventory availability, order promising, allocation, fulfilment, and post-purchase experiences. Build event-driven processing with Kafka, integrate OMS, WMS, ERP, commerce, and fulfilment platforms, and ensure services are secure, observable, reliable, and performant. Own features from design through production, write tested code, participate in reviews, troubleshoot production issues, and improve operational efficiency.

Designs, automates, and executes functional, integration, API, contract, regression, concurrency, and performance tests for inventory, order promising, sourcing, and fulfillment platforms. Investigates defects, validates fixes, maintains regression coverage, integrates quality tests into CI/CD pipelines, and supports release readiness. The role collaborates with product and engineering teams to validate distributed commerce systems, integrations, business rules, data consistency, scalability, resilience, and consumer-impacting workflows.

Develop cloud-based Java microservices for CC Responder using agile Scrum practices. Responsibilities include full software development lifecycle ownership, system integration, testing, documentation, customer support, mentoring junior engineers, code reviews, architectural guidance, and establishing code quality standards.

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.

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.

Build and operate high-performance backend systems and distributed services using Elixir and Phoenix. Design declarative infrastructure with Terraform, Terramate, FluxCD, Kubernetes, and Helm; manage AWS cloud workloads, cluster upgrades, GitOps workflows, observability, and databases. Collaborate with a remote engineering team on architecture, product development, debugging, reliability, and customer success.

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.

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.

Build and maintain full-stack services for TP ICAP’s AWS-based Fusion Platform. Own software design, development, testing, deployment, and production support across low-latency, event-driven systems. Drive engineering improvements, architectural discussions, refactoring, estimation, and delivery within an Agile team. Develop reusable microservices using TypeScript and AWS technologies, maintain high code quality through automated testing, and mentor junior engineers. Occasional out-of-hours support may be required for production incidents.

Design, build, scale, and support reliable distributed systems integrating Proofpoint threat defense with Microsoft and Google email platforms. Develop Python services, maintain business-critical systems, ship code through CI/CD, monitor production environments, address security vulnerabilities, and process sensitive data at high volume with low latency. The role emphasizes DevOps, scalability, reliability, experimentation, and data-informed product improvements.

Own end-to-end development of automation and AI-driven systems across tenant find, property management, or payments. Responsibilities include understanding complex operational workflows, identifying automation opportunities, designing scalable architectures, collaborating with product managers, making pragmatic AI and agentic system decisions, and delivering reliable solutions from concept through production. The role requires strong product judgment, technical ownership, and the ability to improve business outcomes in a fast-changing 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.

Lead the technical vision and development of Elasticsearch’s core search infrastructure, including indexing, retrieval, query execution, and relevance. Research search algorithms and data structures, contribute to Lucene, guide technical roadmaps, collaborate across teams, mentor senior engineers, and build high-performance distributed search systems. Serve as a subject-matter expert while driving projects from concept through completion.

Design, develop, test, and maintain scalable backend applications, services, and APIs using modern engineering practices. Responsibilities include architecture and solution design, unit and integration testing, troubleshooting, code reviews, technical discussions, Agile collaboration, continuous improvement, and mentoring junior engineers. The role emphasizes performance, reliability, scalability, security, maintainability, and translating business requirements into high-quality technical solutions.

Build and maintain scalable backend systems using Java, Node.js, Spring, AWS, microservices, and REST APIs. Lead architecture and technical design, promote secure and reliable engineering practices, drive automated testing and CI/CD, mentor engineers, collaborate with clients and cross-functional teams, and evaluate AI and emerging technologies to improve software delivery.

Build AI-powered product quality infrastructure for capturing, synthesizing, routing, and acting on customer feedback. Develop bug intake and triage systems, dashboards, data pipelines, analytics tooling, and integrations with ticketing, payment, CRM, and data warehouse systems. Partner with support engineers and domain specialists to improve product quality and ship internal tools quickly.

The Backend Software Engineer will develop and maintain backend systems for data processing related to coffee farming, utilizing Python and PostgreSQL. Responsibilities include feature development, problem-solving, and adapting systems to regulatory changes while ensuring system resilience.

The Edge Functions Engineer will evolve the Supabase Edge Runtime, implement monitoring and optimizations, manage features, and work closely with the Deno open-source teams.