Top Software Engineer Jobs in Belfast

Provides technical leadership for hospitality technology platforms, defining architecture and technical strategy across multiple teams. Designs scalable distributed systems, reusable platforms, tooling, and services while improving resilience, observability, incident management, and performance. Partners with architects, vendors, engineers, and stakeholders on technology decisions and investment priorities. Mentors engineers, promotes engineering excellence, and contributes to recruitment and technical community development.

Build, maintain, and release reliable cloud software for the Customer Data Platform. Lead complex feature delivery, make architectural decisions, improve code quality, testing, observability, security, and operational reliability. Collaborate with Product, Design, and adjacent engineering teams, participate in on-call support, contribute to planning and OKRs, and mentor engineers through pairing, reviews, and technical guidance.

Lead technical strategy and software engineering excellence across customer platform systems supporting warehouse operations. Design and launch complex, high-impact solutions; promote clean architecture, DevOps, security, observability, reliability, performance engineering, and testing practices. Influence technology and product investment decisions, mentor senior engineers, improve engineering processes, support recruitment and outreach, and foster innovation, autonomy, and engineering maturity across cross-functional teams.

Design, develop, deliver, and support Java-based compliance and supervision technology for global markets. Build API-first, event-driven, microservices, and cloud-native solutions integrating vendor platforms, proprietary systems, and enterprise data services. Partner with Compliance, Risk, Data, Security, Architecture, and business stakeholders. Ensure solutions satisfy regulatory obligations through auditability, traceability, entitlement controls, monitoring, and evidencing. Participate in Agile delivery, continuous improvement, audits, regulatory reviews, and remediation programs.

Design, develop, and optimize Citi’s ultra-low-latency risk engine for cash equities electronic trading. Build real-time pre-trade risk checks, position limits, and exposure controls using high-performance concurrent architectures. Integrate risk services with connectivity, market access, and market data systems while tuning JVM, native code, operating systems, networking, and hardware for minimal latency and jitter. Mentor engineers, guide architecture, coordinate global delivery, and collaborate with trading, quantitative, infrastructure, QA, and support teams.

Build and launch scalable backend features and services for restaurant partners. Own projects end to end, collaborate with product and engineering teams, identify high-impact technical opportunities, and maintain reliable production systems through testing, monitoring, logging, and DevOps practices. The role uses Python and Flask primarily, with flexibility to work in Go, Ruby, and other technologies on a distributed remote team.

Develop and evolve the Olo Android app, owning complex features from design through production. Responsibilities include mentoring engineers, leading code reviews, improving technical debt and performance, designing scalable systems, maintaining production services, optimizing CI/CD and testing automation, collaborating with Product, and participating in on-call support. The role also contributes to roadmap planning, architecture, shared components, development tooling, and continuous team improvement.

Develop and maintain the Olo iOS app, delivering complex features, improving architecture, addressing technical debt, and optimizing performance and reliability. Lead code reviews, mentor engineers, contribute to roadmap and technical decisions, improve CI/CD and testing automation, maintain production services, participate in architecture design, and support on-call operations. Collaborate with Product and stakeholders to deliver scalable, maintainable mobile software.

Design, develop, modernize, test, deploy, and support full-stack enterprise applications using Java and modern frontend technologies. Own complex features end to end, troubleshoot performance and scalability issues, contribute to architecture and technical decisions, apply clean code and automated testing practices, and use AI tooling throughout the development lifecycle. Collaborate with product, QA, and UX teams, mentor junior engineers, document systems, and participate in Agile planning and process improvement.

Design, develop, modernize, test, deploy, and support full-stack enterprise applications using C# and .NET. Build backend services and frontend applications, troubleshoot complex issues, participate in architecture and code reviews, and champion clean code, automated testing, reliability, security, and AI-assisted development. Collaborate with product, QA, UX, and other stakeholders while mentoring junior engineers, documenting systems, and contributing to sprint planning and continuous improvement.

Develops full-stack features for live operational metrics, including backend services, APIs, and real-time frontend dashboards. Responsibilities include improving system scalability and stability, integrating business logic, troubleshooting software, documenting technical changes, and collaborating with stakeholders. Requires frontend JavaScript or TypeScript experience and backend .NET development with C# and ASP.NET. The role is primarily remote with occasional Bristol or London office visits.

Leads technical direction and hands-on execution for major products and systems. Designs scalable backend, frontend, API, database, and infrastructure solutions; writes code; drives architecture decisions; solves production issues; improves engineering quality, reliability, security, testing, and observability; and mentors engineers across teams.

Lead technical direction and hands-on execution for major products, systems, and engineering initiatives. Design scalable and reliable backend, frontend, API, database, and infrastructure solutions; write code; make architecture trade-offs; solve production issues; and improve testing, security, observability, and development practices. The role also leads critical initiatives, mentors engineers, and translates ambiguous product challenges into clear technical plans.

Own technical direction and execution for major products and systems. Design scalable, reliable architectures across backend, frontend, APIs, databases, and infrastructure; write production code; lead architecture decisions; solve complex production problems; improve engineering quality, testing, security, and observability; drive critical initiatives; and mentor engineers across teams.

Manage and scale AWS EKS Kubernetes clusters, automate infrastructure with Terraform or Pulumi, optimize system performance, maintain blockchain nodes, scale databases handling terabytes of data, and improve reliability through monitoring and observability. Collaborate with backend and product teams to support feature development and platform scalability.

Architect and develop production-grade business systems across Salesforce, NetSuite, and integrated enterprise platforms. Build quoting, subscription, and entitlement engines; create automation pipelines and API integrations; establish architecture, security, documentation, and code-review standards; and translate commercial policies into scalable technical solutions. The role partners with Finance, Sales Operations, Customer Success, and product stakeholders while maintaining system reliability, auditability, observability, and production readiness.

Build scalable Java backend systems using Spring, REST APIs, microservices, databases, messaging, Docker, and cloud platforms. Lead architecture and technical design, promote engineering excellence, mentor engineers, drive delivery, improve automation, and evaluate emerging technologies and AI capabilities. Collaborate with clients and cross-functional teams to deliver secure, resilient software with measurable business value.

Lead technical design and delivery of supply chain and warehouse software at scale. Drive architecture, DevOps, observability, reliability and performance practices; mentor senior engineers; influence product and technology strategy; promote clean code and engineering excellence across teams; support recruitment and outreach.

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.

Design, implement, test, and ship Firefox security and hardening features for enterprise users. Improve browser security architecture across operating systems, including privilege isolation, trust boundaries, cryptographic protocols, WebPKI, and security-sensitive web APIs. Investigate security issues, deliver maintainable fixes, and resolve stability, correctness, performance, memory, and multithreading challenges in a complex native codebase.

The Senior Software Engineer will enhance the core product by developing features and tools for Chainguard Images, collaborating with teams and ensuring product quality.

Own and design high-impact components of Chainguard's container image platform. Build and improve image build systems, tooling, and services at scale. Drive technical direction, participate in roadmap planning, collaborate cross-functionally, and mentor engineers to raise engineering quality.

Build innovative software products in the Special Projects Division addressing public health, agriculture, education, and aid-related challenges in Sub-Saharan Africa. Responsibilities include designing software architectures, developing on UNIX-based platforms, participating in code reviews, using disciplined version control, collaborating with teams, and potentially applying Django, React, Android, or PyTorch. The role may involve travel to Africa to understand local contexts.

Design, build, and evolve customer-facing backend services and public APIs supporting multiple Chainguard products. Own features end-to-end, create technical design documents, collaborate with Product and Experience teams, and contribute to a fast-paced, product-driven roadmap. Build reliable, observable cloud-native services and shared platform capabilities, including authentication and notifications.

Build and operate high-throughput backend services for financial crime detection across WorldRemit and Sendwave. Responsibilities include developing alerting, screening, risk-rating, and agentic AI investigation workflows; integrating third-party compliance platforms; improving observability, reliability, and auditability; collaborating with compliance teams; reviewing designs and code; and participating in on-call production support. The role requires strong Java and Spring expertise, event-driven systems experience, and familiarity with cloud and infrastructure tooling.