Top Software Engineer Jobs in Belfast

As a Senior Blockchain Engineer, you will design and optimize smart contracts and blockchain infrastructure, collaborate with teams to ensure secure solutions, and lead development efforts in the DeFi ecosystem. You will analyze technologies, mentor staff, and enhance performance while maintaining security best practices.

As a Software Development Engineer II at Mapbox, you'll contribute to the Studio team, build tools for map designers, solve complex architecture problems, and ensure code quality and performance while mentoring teammates.

The role involves designing, developing, and maintaining high-throughput systems for the billing platform, collaborating with teams, leading technical discussions, and mentoring other engineers.

Optimize Ubuntu integration across latest IoT and server-class hardware, lead customer engagements, and work with open source communities in a remote, collaborative environment.

As a Software Support Engineer, you will troubleshoot and resolve complex issues related to Ubuntu and open source technologies, collaborate with teams, and contribute to community development.

The Sr. Software Engineer will develop public APIs, build integrations with HRIS, maintain platform services, and enhance code quality using Generative AI tools.

Build pixel-accurate UI from Figma and Claude-generated templates using TypeScript/React, and contribute to C# backend services/APIs. Establish AI-native workflows with Claude, implement telemetry, troubleshoot full-stack issues, and improve tooling and maintainability.

Lead design and delivery of reliability frameworks, tooling, and platform capabilities to improve uptime, observability, and operational maturity. Embed reliability into services, define observability and incident practices, contribute to production code, mentor engineers, drive cross-team technical direction, and participate in on-call rotations while reducing operational load through automation and standards.

Design, develop, and enhance Cority software and client solutions. Lead technical decisions and teams, produce production-ready code, implement CI/CD, perform code reviews, mentor junior developers, collaborate with Product Owners, support and maintain systems, and own functional areas or projects.

Lead the design and development of complex Rails features, mentor junior engineers, define technical direction, and ensure high-quality code while collaborating with stakeholders.

The Senior Software Engineer will lead the design and management of cloud infrastructure, automate systems, ensure security, and enhance developer experience while mentoring the team.

Lead prototyping and delivery of high-impact software solutions by researching and applying emerging technologies, building and maintaining modern applications, contributing to architecture and technical decisions, mentoring juniors, and communicating technical trade-offs to stakeholders.

Lead architecture and multi-quarter initiatives for Tempo, Grafana's distributed tracing backend. Own ingestion, storage, query, APIs, and operational SLOs; mentor engineers, participate in on-call, collaborate with product and sibling teams, and contribute to the open-source project to improve performance, scalability, and AI/agent-friendly interfaces.

Develop and improve Firefox desktop features for installs, updates, and OS integration. Implement platform-specific enhancements (Windows/macOS), debug complex issues, participate in design and code reviews, collaborate with a distributed team, and use data to guide product decisions.

Lead design, development, and maintenance of enterprise eCommerce platforms (Shopify Plus, Adobe Commerce/Magento). Build scalable storefronts, custom modules, APIs and integrations (payments, ERP/CRM, shipping). Optimize performance, security, SEO and user experience. Troubleshoot production issues, enforce engineering best practices, contribute to CI/CD, mentor juniors, and drive architecture and platform improvements.

Senior Software Engineer contributing across the full stack within a product-focused, cross-functional team. Build, deploy, and support scalable cloud-native services using event-driven architectures, improve observability and test automation, collaborate with product and customers, and champion engineering best practices to deliver high-value features.

The Senior Software Engineer will architect and develop the Solver network, ensuring performance, collaborating with teams, and leading engineering standards.

Join Reedsy to develop and improve a collaborative word processor, adding features and ensuring performance and security for users.

Design and maintain Golang infrastructure services for the Confluent Cloud Platform, ensuring performance, availability, and capacity planning of the service.

Lead development of ClickHouse's Python connector and SDKs, build integrations with orchestration and transformation tools, drive AI/LLM integration strategy for production data workflows, engage with open-source community, and collaborate across product and platform teams to deliver enterprise-grade data integrations.

Hands-on Staff Software Engineer owning core product architecture and delivery. Design multi-component systems, write code, produce usable design docs, build AI-powered features (RAG, function calling, evaluation), set tooling and patterns, manage cross-team dependencies, and mentor/hire engineers.

Senior SDET who contributes across frontend and backend systems by building and maintaining features with a strong testing mindset. Develop and maintain automated tests, improve test coverage and CI/CD, investigate bugs, support regulatory and compliance testing strategies, and balance automation with exploratory and risk-based testing.

Lead technical direction and modernise international commerce platforms. Design scalable integrations for product, pricing, fulfilment, marketplace and partner flows. Champion engineering excellence, DevOps practices, reliability, observability and run-first ownership. Mentor engineers, align multi-team delivery and shape technology strategy to support international growth.

Lead technical direction and modernise international commerce platforms. Design scalable integrations for product, pricing, fulfilment, partner/marketplace flows. Promote engineering excellence, DevOps ownership, observability, and mentor teams while aligning technology strategy with business goals.

Lead architecture, design and delivery of scalable, cloud-native microservices for retail trading. Provide technical leadership, ensure observability and resilience, drive CI/CD and operational excellence, and mentor engineering teams.