Hey, I'mShaun O'Neill
I design and build exceptional digital experiences with a focus on performance, accessibility, and user delight.
About Me.
I'm a passionate Senior Software Engineer with over 5 years of experience building scalable web applications and innovative digital solutions.
Currently crafting exceptional user experiences at Rapid7, where I lead frontend architecture and mentor junior developers in Dublin's thriving tech scene.
When I'm not coding, you'll find me behind the camera capturing automotive photography with my Audi, or tinkering with embedded systems and IoT projects in my home lab. I love the intersection of technology and automotive engineering.
Featured Projects.
A showcase of my most impactful projects, from AI-powered SaaS applications to community-driven platforms serving thousands of users.
BehindTheBadge
Comprehensive vehicle information lookup service for Irish vehicle registrations. Search any registration number to discover detailed vehicle specifications, make, model, power details, and more. Features community-driven insights with user comments and experiences, plus unique Instagram integration for social discovery.
AutoToonify
AI-powered photo transformation service that converts photos into stunning artistic illustrations. Features multiple styles including cartoon, watercolor, and 3D effects with instant results. Offers full commercial rights to users and has served over 200 satisfied customers with a 4.9/5 rating.
More Projects Coming Soon
I'm constantly working on new projects and experiments. Currently exploring IoT, Machine Learning, and Web3 technologies.
Experience.
My journey at Rapid7, from intern to senior engineer, building enterprise security solutions that protect thousands of organizations.
Rapid7
Cybersecurity • Dublin, Ireland
2019 - Present • 5+ years
Senior Software Engineer
Current RolePartner with product managers and engineering leadership on quarterly and sprint planning, ensuring alignment between technical priorities and business goals.
Key Achievements
Collaborate with engineers across multiple teams to deliver company-wide initiatives, focusing on consistency, scalability, and a seamless user experience across the platform.
Provide technical leadership by shaping frontend architecture, promoting best practices in React and TypeScript, and ensuring long-term maintainability of the codebase.
Mentor and support teammates through code reviews, design discussions, and knowledge sharing, fostering a collaborative and high-performing team culture.
Technologies & Skills
Software Engineer II
PromotedDesigned and implemented advanced React components and patterns, enabling faster development and greater consistency across teams.
Key Achievements
Took an active role in mentorship and onboarding, supporting new engineers and interns, and helping to raise overall code quality.
Collaborated closely with UX, product, and backend teams to translate complex requirements into polished, accessible, and responsive user interfaces.
Contributed to company-wide initiatives to unify the customer experience, ensuring cohesive design and technical alignment across multiple teams.
Technologies & Skills
Software Engineer I
PromotedBuilt and maintained interactive, high-performance web applications using React.js, with seamless backend integrations.
Key Achievements
Participated in code reviews and knowledge sharing, ensuring adherence to best practices and consistency across projects.
Worked closely with designers to deliver responsive, user-friendly experiences that aligned with customer needs.
Helped improve frontend workflows by adopting modern libraries and tooling, streamlining development and reducing technical debt.
Technologies & Skills
Software Engineering Intern
PromotedSupported the development of React-based web applications, gaining experience with modern frontend tools and practices.
Key Achievements
Learned and applied best practices through active participation in code reviews and pair programming with senior engineers.
Collaborated with designers to implement UI features that improved usability and consistency.
Assisted in refining development workflows by contributing to internal tooling and documentation.
Technologies & Skills
Photography.
When I'm not coding, I'm behind the lens capturing the beauty of automotive engineering. Follow my journey on Instagram where I showcase my Audi and other stunning vehicles.
@ThatSexyAudi
Automotive Photography • Instagram
@ThatSexyAudi
Automotive photography featuring golden hour shots, scenic drives, and the journey with my modified Audi S5
Join the community for daily automotive photography and exclusive content
Let's Connect.
I'm always excited to connect with fellow developers, potential collaborators, or anyone interested in discussing technology and innovation. Let's build something amazing together!
shaun@shaunoneill.com
Send me an email
Connect professionally
Let's connect on LinkedIn
GitHub
Check out my code
View my repositories
@ThatSexyAudi
Automotive photography