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Senior Software Engineer - Reconciliation 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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Until further notice
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
Discover rewarding Senior Software Engineer jobs where technical mastery meets strategic impact. A Senior Software Engineer is a pivotal role in the technology industry, representing an experienced professional who designs, builds, and maintains complex software systems. These individuals are far beyond entry-level coding; they are responsible for architectural decisions, mentoring peers, and ensuring the delivery of high-quality, scalable, and performant applications that drive business value. Professionals in these jobs act as technical leaders within their teams, translating product vision into robust technical solutions and setting standards for engineering excellence. Typically, the common responsibilities of a Senior Software Engineer encompass the full software development lifecycle. This includes architecting system design, writing clean and efficient code, conducting thorough code reviews, and troubleshooting sophisticated technical issues. They own significant features or services from conception through deployment and monitoring. A key aspect of the role is collaboration, working closely with product managers, designers, and other engineers to refine requirements and align on solutions. Furthermore, they champion best practices in testing, security, and performance optimization, often integrating these principles into CI/CD pipelines. Mentorship is a fundamental duty, as they guide less experienced engineers and help elevate the entire team's capabilities. The typical skills and requirements for these positions are extensive. A strong foundation in computer science principles is essential. Expertise in one or more modern programming languages (such as JavaScript/TypeScript, Python, Java, C++, or Go) and relevant frameworks (like React, React Native, Node.js, or .NET) is expected. Senior engineers possess deep architectural fluency, understanding how to design systems for scalability, reliability, and maintainability. They are proficient with development tools, version control, and cloud platforms (AWS, Azure, GCP). Soft skills are equally critical: strategic communication, proactive problem-solving, and a performance-first mindset. Experience with agile methodologies, a commitment to continuous learning, and the ability to navigate trade-offs between speed, quality, and technical debt are hallmarks of a seasoned professional. Ultimately, Senior Software Engineer jobs are for those who seek to solve the most challenging problems, build foundational technology, and lead by example. It's a career path defined by continuous growth, ownership, and the tangible impact of one's work on products and users. If you are an engineer ready to take on greater technical leadership and architectural responsibility, exploring Senior Software Engineer opportunities is the next logical step.

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