Freelance Frontend Engineers in Petershagen-EggersdorfFreelance Frontend Engineers in Petershagen-Eggersdorf
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Andrii Tovstonos's avatar
Andrii Tovstonos
Berlin, Germany
Expert Website Maintenance & High-Performance Optimization
New to Contra
Expert Website Maintenance & High-Performance Optimization
Cover image for Firewood Delivery Logic & Maps
Firewood Delivery Logic & Maps Integration ➤ The Challenge: A local firewood supplier needed to automate delivery quotes. Manual distance checking was slow and prone to errors. ➤ The Solution: I built a custom Vanilla JS tool with deep Maps API integration: • Google Maps API: Automated real-time distance calculation for every order. • Dynamic Pricing: Logic that factors in wood type, volume, weight, and mileage. • UX/UI: Lightweight, mobile-first interface for instant customer quotes. ➤ The Result: • Automation: Zero manual checks needed; instant pricing for customers. • Efficiency: Eliminated pricing disputes and optimized the booking flow. • Performance: High-speed tool with zero external library dependencies.
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Cover image for Industrial B2B Growth & Maintenance
Industrial B2B Growth & Maintenance Value ➤ The Challenge: A legacy industrial site was invisible to engineers. Goal: Transform it into a lead-gen tool via technical excellence. ➤ The Solution: I deployed a comprehensive technical and content strategy: • Custom JS Engineering: Developed an intricate lifespan calculator for parts. • 100/100 Speed: Reached perfect performance scores via deep code refactoring. • Expert Content: Launched a research-driven blog that dominated technical search intent. ➤ The Result (The Evidence): • Growth Spike: Deployment led to a 400% surge in organic traffic. • The Maintenance Gap: As shown in the chart, the cessation of expert support ("Too Expensive") coincided with a clear loss of momentum. • Proven ROI: Technical excellence isn't just a setup - it's the engine that sustains market leadership.
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Cover image for Achieving 99/100 Mobile Speed &
Achieving 99/100 Mobile Speed & Breaking the Traffic Plateau ➤ The Challenge: The site was stuck in the "Yellow Zone" (~70 PageSpeed). High-quality content was held back by technical overhead, resulting in a stagnant traffic plateau. ➤ The Solution: I executed a deep technical overhaul to unlock the site's ranking potential: • 0ms Blocking Time: Eliminated JS execution delays for instant interactivity. • Visual Stability: Achieved a 0.001 CLS, ensuring a perfect UX. • Speed: Optimized the rendering path to hit 0.9s FCP and 99/100 Mobile score. ➤ The Result: • Plateau Broken: Technical fixes (last green dot on chart) acted as a catalyst for new organic growth. • Elite Performance: Sustained 99+ PageSpeed scores on mobile. • Business Impact: Improved rankings and higher conversion rates.
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Cover image for 100% Organic Growth via Technical
100% Organic Growth via Technical Refactoring The Challenge: Stagnant traffic and poor mobile UX due to bloated legacy scripts (jQuery), unoptimized media, and weak semantic structure. The Solution: I executed a deep technical overhaul to modernize the stack: • Vanilla JS Migration: Replaced jQuery with pure, high-performance JavaScript. • Smart Media: Implemented WebP/AVIF, responsive sizes, and lazy-loading. • SEO Foundation: Cleaned HTML semantics and added Schema.org microdata. • On-Page: Refreshed Meta Tags to align with search intent. • Bootstrap 5 Tuning: Optimized CDN delivery and CSS path for zero speed impact. The Result: 99–100 Mobile PageSpeed: Perfect scores even with a CSS framework. Traffic Surge: Organic growth from 14K to 30K+ monthly sessions in 12 months.
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Frontend Engineer(3)
Dave Waldorf's avatar
Dave Waldorf
Berlin, Germany
Full-stack engineer
Full-stack engineer
Cover image for davewaldorf/CMS
davewaldorf/CMS
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Cover image for davewaldorf/Style-Me
davewaldorf/Style-Me
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Cover image for Lava
Lava
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Frontend Engineer(2)
Malik A.'s avatar
Malik A.
Berlin, Germany
Software Engineer and Product designer
48
Followers
Software Engineer and Product designer
Cover image for Portfolio Projects
Portfolio Projects
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Cover image for Discover Aura: The First Emotion-Adaptive Interface System
Aura - The World's First Emotion-Adaptive Interface System Designed with Google Stitch. As a developer, I've used plenty of AI tools that can generate screens, but I was curious about something different with Stitch: Could I use it to create an experience-first interface that felt alive rather than just another website? That question became AURA — an experimental emotion-adaptive interface that transforms its visual environment based on how users want to feel. Instead of approaching the challenge as a traditional landing page, I wanted to explore a more immersive direction. What if an interface could behave like a living environment? What if changing an emotional state could alter the atmosphere, motion, lighting, color palette, and overall experience? To test that idea, I designed AURA as a digital experience where users can explore emotional worlds such as Joy, Peace, Wonder, Creativity, Ambition, and Reflection. How Stitch fit into the workflow I didn't start with prompts, I started with ideas. The first step was sketching rough wireframes and visual concepts to establish the structure and flow of the experience. I then created a custom design.md (http://design.md) document containing the creative direction, emotional worlds, visual principles, motion goals, typography, color systems, and overall artistic vision for the project. After importing those references into Stitch, the process became incredibly fluid. The streaming generation experience was one of the most impressive parts of the workflow. Instead of waiting for a final output, I could literally watch the interface take shape directly on the canvas and react to ideas in real time. Once the foundation was generated, I spent most of my time using in-place AI edits. I'd select sections, experiment with different visual treatments, adjust atmosphere, refine layouts, introduce new interactions, and push the experience closer to the vision I had in mind without having to restart from scratch. That iterative loop felt much closer to actual design work than traditional prompting. Motion was another area where Stitch stood out. Since the challenge theme was "Build interfaces that feel alive," I focused heavily on creating smooth transitions, hover interactions, atmospheric movement, environmental effects, and immersive visual storytelling. The result feels less like a conventional website and more like a digital art installation. New Stitch features I leaned on 📄 Imported custom design.md (http://design.md) creative direction document 📄 Imported rough wireframe concepts and visual references 🌊 Streaming generations directly to the canvas ⏩ In-place AI edits using prompts and point-and-click interactions 🎥 Motion-rich interactions, hover states, and immersive transitions 🎨 Rapid visual experimentation and iteration 🚀 Export-ready workflow for deployment Feedback on Stitch Most AI workflows involve repeatedly prompting, waiting, evaluating, and starting over. Stitch felt different, The streaming canvas made the process feel much more collaborative and interactive. Watching designs appear in real time created a stronger sense of momentum and made iteration feel natural. The ability to import references and then refine sections through in-place edits was probably my favorite part of the experience. Rather than constantly rewriting long prompts, I could focus on improving specific parts of the design while preserving everything that was already working. As someone who enjoys experimenting with interface concepts, that workflow felt significantly closer to how designers and developers naturally think. One feature I'd love to see expanded further is even more granular visual control directly within the canvas, allowing creators to tweak generated elements while maintaining the speed of the AI workflow. Overall, Stitch helped shorten the distance between a rough idea and a polished interactive experience. Live Prototype: https://8d2a7837-aura-living-interface-system.netlify.app/ Link to Stitch: https://stitch.withgoogle.com/projects/6682479894200923414 (https://stitch.withgoogle.com/projects/6682479894200923414?pli=1)
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Cover image for Arizona In home caregivers
Arizona In home caregivers
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Cover image for Paylink
Paylink
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Frontend Engineer(1)
David Pinheiro's avatar
David Pinheiro
Berlin, Germany
Full-Stack Dev · React, NestJS & AI integrations
5.0
Rating
1
Followers
Full-Stack Dev · React, NestJS & AI integrations
Cover image for DJ Tracklist Identification and Playlist Conversion
DJ Tracklist Identification and Playlist Conversion
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Cover image for Dashboard Agency
Dashboard Agency
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Cover image for Export API Youtube V3
Export API Youtube V3
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Cover image for Phase-Radar - own product
Phase-Radar - own product
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Frontend Engineer(4)
Abdul Rafay's avatar
Abdul Rafay
Berlin, Germany
Full Stack Dev focused on Next.js, WordPress, Shopify, AI
Full Stack Dev focused on Next.js, WordPress, Shopify, AI
Cover image for Sublet Directory - Easy Sublet Finder
Sublet Directory - Easy Sublet Finder
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Cover image for Recovered WordPress Hacked Website
Recovered WordPress Hacked Website
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Cover image for xsavr - scrapes post data from x.com
xsavr - scrapes post data from x.com
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Frontend Engineer(1)
Matthias Jakisch's avatar
Matthias Jakisch
15 Petershagen-Eggersdorf, Germany
25+ Years Experienced Software Engineer (Front/Back/AI/API)
25+ Years Experienced Software Engineer (Front/Back/AI/API)
Cover image for Additional Product Details, configurable | Codixio
Additional Product Details, configurable | Codixio
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Cover image for Add Product / Discount via URL to Cart | Codixio
Add Product / Discount via URL to Cart | Codixio
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Cover image for PreOrder Function for UpComing Products | Codixio
PreOrder Function for UpComing Products | Codixio
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Frontend Engineer(1)