Shay Brennan-Kelly
Founder & Lead Engineer, SpectrumCoach
◎ Dublin, Ireland
Founder & Lead Engineer, SpectrumCoach
◎ Dublin, Ireland
Biography
Shay Brennan-Kelly is a Staff/Principal-level full-stack software engineer with over 10 years of experience designing and delivering secure, scalable applications across start-ups, regulated SaaS platforms, and enterprise environments. Known for translating complex requirements into maintainable, high-quality solutions while mentoring engineers and driving best practices, Shay has strong expertise in cloud architecture, technical leadership, and accessibility-first development. Currently founding SpectrumCoach, an accessibility-focused SaaS platform, Shay continues to champion inclusive technology and diversity leadership.
Building accessibility-first SaaS platform for neuroinclusive coaching using TypeScript, React and Python. Designed modern React TypeScript frontend optimised for WCAG 2.1 accessibility standards. Developed APIs for authentication, scheduling, client workspaces, and billing. Delivered full-stack features through AWS cloud deployment.
Delivered production-grade AI/ML platforms in Python and Java, meeting compliance and quality standards. Embedded CI/CD quality gates and testing frameworks. Mentored engineers on API standards, code review practices, and architectural design patterns.
Led solution design and delivery of regulated AML/KYC SaaS platform using microservices on AWS. Built secure REST APIs for internal and third-party applications. Migrated monolithic services to AWS, improving resilience and scalability. Cut bugs 50% through quality checks implementation. Mentored 10+ engineers across 30+ global engineering group.
Delivered cloud-native SaaS systems for government border security. Architected Kafka-driven microservices supporting real-time data pipelines on AWS. Led full-stack platform development for COVID travel health certification POCs. Implemented automated security testing in DevSecOps workflows.
Improved API performance 25%, cut AWS costs 40%, and delivered clear technical documentation.
Built and maintained internal sales support systems using Java, MySQL, React while improving documentation and release processes to enhance cross-team collaboration.
Built blockchain KYC products for trade finance, integrating APIs and smart contracts using React and TypeScript.
Built enterprise software in private and public sectors, including a reporting tool saving €500k annually.