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Senior Software Engineer - Search United Kingdom, Belfast Jobs

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Senior Software Engineer - Build AI Tools
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Join Citi's new GenAI Security team in Belfast as a Senior Software Engineer. Design and build a scalable security platform to protect AI applications from adversarial attacks. Leverage your expertise in Python/Go and secure APIs within a collaborative, cutting-edge environment. This role offers ...
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United Kingdom , Belfast
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Citi
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Until further notice
Senior Software Engineer
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Join Citi's Developer Enablement team in Belfast as a Senior Software Engineer. You will build internal platforms and tools using Java/Kotlin, microservices, and Kafka to improve the SDLC for thousands of engineers. We seek expertise in cloud-native tech, DevOps, and CI/CD. Enjoy excellent benefi...
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United Kingdom , Belfast
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Citi
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Until further notice
Senior Software Engineer
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Join Arqit, a leader in quantum-safe cybersecurity, as a Senior Software Engineer in Belfast. Develop mission-critical, scalable encryption software using Python, with opportunities in Rust and AngularJS. Enjoy a comprehensive benefits package including equity, bonus, and private medical insuranc...
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United Kingdom , Belfast
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Arqit
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Senior Principal Software Engineer
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Lead architectural development for cybersecurity products as a Senior Principal Software Engineer at Rapid7 in Belfast. This role requires 12+ years of Java experience and expertise in designing complex, scalable enterprise software. You will drive technical strategy, foster innovation, and champ...
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United Kingdom , Belfast
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Rapid7
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Until further notice
Are you searching for Senior Software Engineer jobs? This critical role represents the pinnacle of technical expertise and leadership within software development teams. Senior Software Engineers are seasoned professionals who architect, build, and maintain complex, scalable software systems that form the backbone of modern digital products and services. They move beyond simply writing code to owning entire technical domains, making high-stakes architectural decisions, and mentoring the next generation of engineering talent. In this profession, individuals typically engage in the full software development lifecycle, from conceptual design and system architecture to implementation, testing, deployment, and ongoing optimization. A core responsibility is translating high-level business requirements into robust, efficient, and maintainable technical solutions. They are expected to write clean, production-quality code while also designing the underlying frameworks and infrastructure that enable other developers to contribute effectively. Senior Engineers proactively identify technical debt, performance bottlenecks, and potential scalability issues, advocating for and implementing strategic improvements. Common responsibilities across Senior Software Engineer jobs include leading the technical direction for major features or entire product modules, conducting rigorous code reviews to ensure quality and knowledge sharing, and collaborating closely with product managers, designers, and other engineering teams to align on goals and execution. They are often the go-to experts for solving the most complex technical challenges, debugging intricate system-wide issues, and establishing best practices for coding, testing, and deployment. A significant part of the role involves elevating the entire team through mentorship, technical guidance, and fostering a culture of continuous learning and engineering excellence. Typical skills and requirements for these positions are extensive. Employers generally seek candidates with 5+ years of deep, hands-on experience in one or more core programming languages and technology stacks relevant to the domain, such as C++, Java, Python, JavaScript/TypeScript, or frameworks like React Native. Proficiency in system design, data structures, algorithms, and software architecture patterns is non-negotiable. Senior Engineers must possess strong expertise in relevant areas like cloud services (AWS, Azure, GCP), database design, API development, and DevOps practices including CI/CD pipelines. Equally important are the soft skills: exceptional problem-solving abilities, strategic communication to explain technical trade-offs to non-technical stakeholders, a proactive ownership mindset, and a proven track record of leading significant technical initiatives from conception to delivery. For those exploring Senior Software Engineer jobs, success hinges on this powerful combination of advanced technical mastery and influential leadership.

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