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 ship native Android features in Kotlin for an AI-enabled neobank. Design clean mobile flows for payments, insurance and financial services, integrate backend APIs, improve performance and reliability, use analytics and on-device ML (TensorFlow Lite) to enhance user journeys, and collaborate with product and design.

Build scalable, low-latency backend APIs, event-driven services, integration layers, and microservices supporting personalization and recommendation experiences. Partner with AI/ML and data engineers to deploy models, expose AI services, and develop React applications. Improve security, observability, reliability, performance, scalability, and operational efficiency while using AI-assisted engineering tools to enhance delivery and code quality.

Design, build, deploy, and operate software and systems supporting Firefox engineering. Develop developer tooling, CI/CD, workflow automation, and AI-assisted development tools. Own complex problems across software, cloud, and operations while improving reliability, performance, observability, and cost efficiency. Collaborate across engineering and infrastructure teams, use telemetry and metrics for technical decisions, contribute to architecture and strategy, and help establish reusable operational standards and patterns.

Develop privacy, anti-tracking, and phishing protections for Firefox and improve the Gecko browser engine. Build performant, low-latency C++, Rust, and JavaScript software while independently delivering complex features within release windows. Collaborate asynchronously with a distributed international team and communicate technical decisions clearly.

Build and operate scalable, low-latency backend services, APIs, event-driven systems, integrations, and frontend applications supporting membership, loyalty, rewards, and consumer engagement. Configure and integrate Antavo with commerce, CRM, CDP, marketing, and data platforms. Apply secure, observable, resilient engineering practices, troubleshoot production issues, and optimize performance. The role requires strong Java and Spring Boot expertise, plus working knowledge of React, Node.js, Kafka, and SQL/NoSQL databases.

Build scalable, low-latency backend APIs, event-driven services, model-serving layers, and integrations supporting real-time and batch personalization and recommendation experiences. Design reliable, secure, observable distributed systems using Java and Spring Boot, optimize performance and operational efficiency, and integrate LLM and AI services into production applications. Collaborate with engineering leadership and use AI-assisted development tools to improve delivery and code quality.

Designs and executes functional, integration, API, automated, exploratory, and end-to-end tests for personalization, recommendation, experimentation, and consumer intelligence capabilities. Builds test suites, validates AI-driven outputs and consumer journeys, manages test data, performs cross-browser testing, partners with engineering and product teams, and improves automation coverage, regression efficiency, and defect detection.

Evaluate AI coding-agent interactions for quality, engineering judgment, reasoning, explanations, and user trust. Provide clear written feedback, distinguish response-quality levels, help define evaluation standards, and record short video explanations. The role requires senior-level software engineering experience, strong TypeScript/JavaScript or Python skills, familiarity with OpenAI Codex, Claude Code, or Cursor, and excellent English communication.

Design, develop, and maintain high-performance consumer-facing web applications using React, TypeScript, and JavaScript. Lead frontend architecture, performance optimization, accessibility, reusable component development, API integration, experimentation, production troubleshooting, and CI/CD support. Collaborate with Product, Design, QA, Platform, and Architecture teams while mentoring engineers, conducting code reviews, supporting Agile delivery, and improving engineering quality and operational excellence.

Build BLP’s core software across infrastructure, backend, machine learning, and product extension platforms. Responsibilities include operating secure and observable cloud infrastructure, developing performant distributed systems, applying AI to business problems, and enabling customer process automation. The role emphasizes formal reasoning, correctness by construction, maintainable systems, type systems, and functional programming. Work is available onsite in Zurich or remotely within Europe.

Build and operate production AI infrastructure powering intelligent agents at scale. Develop high-performance Rust services for model inference, orchestration, and execution; design scalable distributed systems; establish MLOps, observability, guardrails, and failure recovery; and optimize latency, throughput, reliability, and cost. Partner with agent systems and infrastructure teams to turn prototypes into hardened services serving millions of users.

Build and maintain internal and public-facing APIs and services powering the Web App and developer experience. Develop API functionality, Admin API systems, WebSocket and REST behavior, and usage and billing integrations with Stripe. Investigate production issues and security vulnerabilities, write and review tested code, make technical decisions, and collaborate across engineering, Product, and Design teams.

Build and maintain scalable backend payment systems covering payment methods, fund capture, recipient creation, orchestration, transaction records, and fiat and crypto wallets. Improve secure payment flows across products, ensure observability through dashboards and alerting, and collaborate with backend, mobile, and full-stack teams. The role requires ownership of reliable, well-tested, maintainable APIs and services supporting high-volume cross-border money movement.

Build and architect scalable software using Ruby on Rails, React, and AWS. Lead full-lifecycle development, modernize legacy platforms, establish secure and reliable engineering practices, and promote AI-assisted development. Collaborate with product and engineering stakeholders, provide technical leadership, review code, mentor engineers, estimate work, and deliver roadmap initiatives through production. The role also emphasizes automated testing, CI/CD, system scalability, data accuracy, security, and regulatory alignment.

Lead the development of Runware's serverless platform by building core systems for AI workload management and providing technical guidance to the team.

Lead development of Runware’s AI platform, including scalable backend APIs, SDKs, developer tools, and inference orchestration systems. Design high-performance distributed architectures, optimize image and video model integrations, improve reliability and observability, shape technical direction, and mentor engineers. Collaborate across platform, infrastructure, and product teams to deliver robust developer experiences and maintainable systems.

Diagnose and verify long-tail Firefox WebCompat bugs, reproduce and triage site-breakage reports, write WebCompat interventions, and implement simple AI-assisted fixes. The role converts reported breakages into actionable or resolved bugs and requires strong HTML, CSS, JavaScript, browser DevTools, and cross-browser debugging skills.

Lead the technical direction and architecture of the Foundations platform team, owning authentication, authorization, SSO, secrets management, tenancy, and core platform services. Design APIs, drive services through launch, make technical decisions, establish engineering standards, and mentor engineers without formal management authority. Partner with engineering and product leaders to align execution with priorities.

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.

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.