Senior Frontend Engineer & Studio Founder
11+ years building high-performance marketing websites for B2B SaaS companies. Specializing in Astro, Next.js, and headless CMS architectures that score 100 on Lighthouse.
Senior Frontend Engineer based in Berlin. I've spent 11 years helping SaaS companies turn slow, bloated websites into fast, conversion-driven platforms — and I care deeply about the craft of every pixel and every millisecond.
I'm a Senior Frontend Engineer based in Berlin with over 11 years of experience building marketing websites and web applications for B2B SaaS, fintech, and enterprise companies across Europe.
From legacy jQuery rewrites to full-stack headless builds, I've shipped production software at every scale — solo, in distributed teams, and as a lead across multi-client agency environments.
Today I run my own studio, helping companies replace slow, bloated websites with fast, CMS-driven platforms.
Delivered 10+ B2B SaaS marketing websites, contributing to 15–30% conversion rate improvements via performance and UX optimization.
Reduced average page load time by 30–50% using SSR optimization, code splitting, and asset strategies.
Led frontend architecture for reusable component systems, cutting new page dev time by 25–35%.
Refined Core Web Vitals — LCP under 2.5s on key pages with measurable SEO ranking lifts.
Built enterprise frontend apps for finance, telecom, and industrial clients — serving 50,000+ users per platform.
Developed reusable component libraries in React and Vue.js across 8+ enterprise applications.
Integrated REST APIs handling 10k–100k+ daily requests depending on client system.
Led migration of legacy jQuery systems to modern frameworks, reducing maintenance effort by 40%.
Built responsive UI components for enterprise portals serving 10,000–30,000+ users per client.
Delivered financial intelligence platforms using Next.js and data-driven page architectures.
Assisted migration of legacy frontend systems, improving maintainability and long-term stability.
Decreased recurring UI bugs by 20% through structured fixes and regression testing.
Client work across fintech, energy, SaaS, and enterprise — all built for performance, SEO, and editorial experience.
Financial Intelligence Platform
High-performance marketing website for the leading debt capital markets intelligence platform. Built data-driven content pages, editorial CMS workflows with Sanity, and real-time data visualizations for a global fintech audience.
Energy Intelligence & Analytics
Marketing website and content hub for an energy data analytics platform. Architected a scalable content model in Sanity supporting multiple editorial teams, with SSG pages delivering sub-second load times.
Streaming SQL & Live Data Platform
Full redesign and rebuild of the marketing site for a real-time streaming SQL platform. Implemented a component-driven design system in Svelte, authored developer-facing documentation pages, and shipped A/B tested landing pages.
AI-Powered Customer Support
Rebuilt the marketing website from scratch with a strong focus on conversion rate optimization and Core Web Vitals. Introduced reusable section components and deep CMS integration for rapid campaign landing pages.
Enterprise Technology Consulting
Component library and marketing platform rebuild for a global technology consultancy. Delivered a scalable design system with 40+ components, and migrated the legacy WordPress site to a headless CMS architecture.
B2B Marketing Website Agency
Agency's own marketing website and component platform, serving as a blueprint for all client deliverables. Performance-first architecture used as a reference implementation for Lighthouse 100 across all four categories.
30+ marketing websites shipped across fintech, SaaS, and enterprise. Every project gets the right stack — chosen for performance, DX, and long-term maintainability.
Whether you need a new marketing site, a Sanity migration, or a performance audit — I'm ready to talk.
osvaldo.martini.dev@gmail.com