Frontend Engineering
ReactNext.jsTypeScriptJavaScriptHTMLCSSTailwind CSSAccessibility
Curriculum vitae
Carlos Sierra
Senior Front-End Engineer
An overview of my frontend experience, core skills and selected project references.
Snapshot
- Location
- Melbourne, Australia
- Focus
- Frontend engineering, UI systems and delivery quality.
Professional summary
Frontend engineer focused on clear UI, structured implementation and reliable delivery.
I'm a Front-End Engineer with experience across websites, campaign delivery, eDM systems and modern responsive UI implementation. My work combines clean frontend execution, reusable structure, accessibility awareness and a practical understanding of how digital projects are delivered in real production environments.
Core skills
Core skills: How I use them in practice.
Interface Systems
Component architectureDesign systemsResponsive layoutsInteraction statesStructured content
Delivery
VercelGit workflowSanity (Headless CMS)CMS integrationCross-browser QAPerformance review
Highlights
Strengths that show up consistently in my work.
These themes reflect how I tend to approach frontend implementation across both product-style websites and campaign-driven environments.
Structured frontend systems
Built work that favours predictable structure and reusable patterns over fragile one-off execution.
Design-aware implementation
Strong experience in translating layouts, hierarchy and interface direction into polished frontend delivery.
Clear presentation of technical work
Able to describe and present implementation work clearly for both technical teams and hiring stakeholders.
Experience
Selected experience.
Frontend and digital production experience across websites, eDM systems, HTML5 banners and responsive UI delivery.
Current practice
Frontend Engineer
Freelance
Period
2015 - Present
Delivering websites, landing pages and eDM campaigns for businesses that need practical, modern web presence and reliable frontend implementation.
Designed, built and launched modern business websites with a focus on clarity, responsiveness and maintainable structure.
Delivered one-page sites, landing pages, eDM campaigns and animated banners across a range of business needs.
Handled implementation end to end, from frontend build and layout refinement through to deployment-ready delivery.
ReactTailwindTypeScriptFrontend DevelopmentQA ProcesseDMWeb Design
Marketing and delivery team
Senior Front-End Developer
MADE THIS
Period
Dec 2023 - Jan 2025
Delivered frontend development across landing pages, responsive eDMs and HTML5 animated banners, translating creative direction into polished, production-ready digital work.
Built responsive landing pages, eDMs and animated banner work across fast-paced campaign delivery environments.
Worked across React, Bootstrap, GSAP, JavaScript, Sass and production tooling including Node and npm.
Balanced visual quality, implementation accuracy and turnaround speed across campaign-led frontend delivery.
JavaScriptReactBootstrapGSAPNodeCMS WorkflowsPerformance Review
Earlier experience
Senior Front-End Developer
eg+ worldwide
Period
Jan 2018 - Jan 2025
Delivered frontend and digital production work across websites, responsive eDMs, HTML5 banners and landing pages, with a strong emphasis on scalable delivery and implementation quality.
Built responsive digital experiences across web, email and campaign formats in high-volume production environments.
Worked across React, Node, GSAP, Gulp, JavaScript and Sass to support efficient and reliable campaign delivery.
Contributed to workflow improvements and repeatable production patterns that supported faster execution and consistent output quality.
ReactNodeGSAPGulpMarketing CloudCampaign Production
Project references
Selected project references
A few projects that reflect how I approach frontend implementation, delivery and long-term usability.
Structural Assessments
An engineering services site built to improve clarity, trust and production readiness through structured frontend implementation.
anyMotion
An internal production tool focused on campaign automation, reusable build logic and faster banner delivery.
VAA
A content-driven website and CMS setup focused on reusable sections, dynamic event pages and easier day-to-day publishing.
Education and specialisation
Ongoing learning and technical development.
Alongside project work, I continue refining my frontend practice through structured learning, design-to-code execution and deeper work with modern UI systems.
Ongoing full-stack specialisation
Continuous learning across frontend systems, accessibility, performance and modern component-based workflows.
Design-to-code practice
Continued work on layout systems, interaction quality, UI patterns and translating visual direction into robust frontend implementation.
Tooling
Tools and technologies.
The tools below reflect the environments I've worked in most often across frontend build, interface implementation and digital delivery.
Build
ReactNext.jsTypeScriptTailwind CSSSemantic HTMLCSS
Interface
Component UIDesign tokensResponsive layoutAccessibilityRelease polish
Workflow
GitContent modellingCMS updatesReview cyclesRelease support
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