Shaun O'Neill

Years Experience

50+

Projects Delivered

100k+

Lines of Code

15+

Happy Clients

Dublin, Ireland

About Me.

I'm a passionate Senior Software Engineer with over 6 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 S5, or tinkering with embedded systems and IoT projects in my home lab. I love the intersection of technology and automotive engineering.

ReactNext.jsTypeScriptNode.jsPythonAWSDockerGraphQL

~/home/shaunoneill

Featured Work

Featured Projects.

A showcase of my most impactful projects, from AI-powered SaaS applications to community-driven platforms serving thousands of users.

Featured

Live

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.

1,200+

Active Users

15K+

Searches

+45%

Growth

Next.jsTypeScriptVehicle Data APICommunity Platform

Featured

Live

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.

200+

Customers

4.9/5

Rating

50K+

Conversions

Next.jsAI/MLImage ProcessingTypeScript

More Projects Coming Soon

I'm constantly working on new projects and experiments. Currently exploring IoT, Machine Learning, and Web3 technologies.

React NativePythonMachine LearningIoTWeb3WebGL

Career Journey

Experience.

From intern to senior engineer at Rapid7, building enterprise security solutions.

Rapid7

2019 - Present • 6+ years

Senior Software Engineer

Current

Rapid7

Dublin, Ireland

Sep 2024 - Present

Present

Partner 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.

React.jsTypeScriptPlanning & ExecutionCross-Team CollaborationMentorshipFrontend Architecture

Software Engineer II

Promoted

Rapid7

Dublin, Ireland

Jan 2023 - Sep 2024

1 year 9 months

Designed 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.

React.jsTypeScriptDesign SystemsPerformance OptimizationMentorshipCross-Team Initiatives

Software Engineer I

Promoted

Rapid7

Dublin, Ireland

Jun 2020 - Jan 2023

2 years 8 months

Built 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.

React.jsJavaScriptFrontend DevelopmentAgile Collaboration

Software Engineering Intern

Promoted

Rapid7

Dublin, Ireland

Jun 2019 - Jun 2020

1 year 1 month

Supported 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.

React.jsJavaScriptCollaborationLearning & Adaptability

Automotive Photography

Photography.

Capturing the beauty of automotive engineering through my lens. From rolling shots to golden hour sessions with my Audi S5.

@ThatSexyAudi

Automotive Photography • Dublin, Ireland

2.5K

Followers

150+

Posts

500HP

Audi S5

Rolling Shots

Dynamic motion blur

Golden Hour

Perfect lighting

Car Details

Close-up beauty

View Post

Join 2.5K+ enthusiasts for automotive content

Get in Touch

Let's Connect.

Have a project in mind or want to chat about technology? I'm always open to discussing new opportunities and ideas.

Email

shaun@shaunoneill.com

Best for detailed inquiries

Let's connect

Professional networking

GitHub

View my work

Open source projects

Instagram

@ThatSexyAudi

Automotive photography

Usually responds within a few hours

Hey, I'mShaun O'Neill

About Me.

Featured Projects.

BehindTheBadge

AutoToonify

More Projects Coming Soon

Experience.

Rapid7

Senior Software Engineer

Key Achievements

Software Engineer II

Key Achievements

Software Engineer I

Key Achievements

Software Engineering Intern

Key Achievements

Photography.

@ThatSexyAudi

Let's Connect.

Email

LinkedIn

GitHub

Instagram