Top Software Engineer Jobs in Belfast

Lead the design, development, testing, and maintenance of scalable backend software applications. Provide technical leadership through mentoring, code reviews, architectural decisions, and best-practice adoption. Collaborate with product, design, and stakeholders to define requirements, manage technical risks, and deliver secure, reliable solutions. Champion continuous integration, code quality, automated testing, data protection, and compliance while driving innovation and fostering a high-performing engineering culture.

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.

Lead large-scale technical initiatives and build scalable product functionality and infrastructure using TypeScript, React, and Node.js. Partner with product and design teams to develop privacy features for SaaS customers, make architectural tradeoffs, mentor engineers, support hiring, and establish engineering excellence across a growing organization.

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 test automation frameworks and QAOps infrastructure for UI, API, backend, and end-to-end testing across multi-cloud environments. Integrate automation into CI/CD pipelines, analyze test and production telemetry to identify risks, support release validation and QA sign-off, and drive quality engineering best practices across distributed teams.

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.

Design, develop, and maintain scalable web applications using .NET backend and Angular/React frontend. Collaborate on requirements, implement RESTful APIs, optimize performance, debug, maintain documentation, support end-users, and work within CI/CD and DevOps workflows.

Design, develop, customize and integrate Microsoft Dynamics 365 CRM/CE solutions. Build entities, forms, workflows, plugins, reports and dashboards using CRM SDK, C#, JavaScript, ASP.NET and SQL. Troubleshoot issues, estimate implementation approaches, collaborate with stakeholders, document solutions, and mentor junior developers. Banking domain experience preferred.

Build and maintain backend-first features and integrations for Triptease's marketing channels. Work across the full stack (primarily backend), design scalable distributed systems, implement CI/CD on cloud platforms, collaborate closely with product teams, pair program, write tests (TDD), and contribute to squad strategy and product quality.

Build and improve Mozilla’s Add-ons platform, including Python/Django applications, automated moderation pipelines, reviewer tools, DevHub, internal developer platforms, and CI/CD systems. Establish engineering standards, observability, safe deployment practices, documentation, and incident response processes. Debug complex production systems, improve reliability, collaborate across distributed teams, mentor peers, and contribute to open-source development.

As a Senior Software Engineer, you will enhance the REDAPL platform, leading initiatives in data ingestion, processing, and supporting infrastructure-related projects while mentoring other engineers.

Leads a software development team through the full product lifecycle, including user research, product strategy, roadmap planning, application development, testing, code reviews, documentation, team performance management, budgeting, partnerships, and user support. The role also manages Agile processes, reports metrics, develops funding proposals, and participates in conferences and periodic travel.

Develop and support Python microservices, web applications, APIs, integrations, and internal tools. Design reliable, secure, observable distributed systems and deploy services across Kubernetes environments. Collaborate with stakeholders and DevOps engineers on architecture, roadmaps, and delivery while protecting customer data. Investigate complex issues, improve data and automation workflows, and mentor junior engineers in a remote-first team.

Automate testing and quality assurance for cloud-native data platforms, including data lakehouses, pipelines, APIs, and front-end applications. Responsibilities include creating test plans, executing manual and automated tests, managing test data, defining acceptance criteria, reporting quality metrics, supporting UAT and SIT, and improving QA frameworks, onboarding, training, and SDLC processes within an agile cross-functional team.

Senior backend engineer role building scalable, resilient Go-based backend services and APIs for cloud environments (AWS/Azure/GCP). Work with containers, Docker, Kubernetes, TDD, and performance optimisation while collaborating with client teams in a remote-first consultancy.

Responsible for building and maintaining Android applications with AI features. Focus on performance, UX design, and collaboration with backend and ML engineers.

Build and ship native Android features using Kotlin and Jetpack Compose. Design clean user flows for financial services, integrate backend APIs, improve performance and stability, use analytics and production feedback, and implement AI-assisted on-device experiences where beneficial.

The Software Engineer will develop and maintain cross-platform desktop applications, focusing on performance, reliability, and integration of AI features. Responsibilities include optimizing applications, managing local data, and ensuring stability on macOS and Windows.

As a Software Engineer in Sustaining Engineering, you will resolve complex issues related to Ubuntu and open-source software, engage with upstream communities, and develop bug fixes while maintaining close collaboration with support and product teams.

As a Python and Kubernetes Software Engineer, you will develop data analytics solutions using open source tools, collaborating with a distributed team.