Freelance Frontend Engineers in BerlinFreelance Frontend Engineers in Berlin
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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/Style-Me
davewaldorf/Style-Me
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Cover image for davewaldorf/CMS
davewaldorf/CMS
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9
Cover image for Lava
Lava
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6
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Frontend Engineer(2)
Catalin Waack's avatar
Catalin Waack
pro
Berlin, Germany
10+ yrs exp: Engineer | Expert REACT/NEXT/TS
$10k+
Earned
1x
Hired
2
Followers
10+ yrs exp: Engineer | Expert REACT/NEXT/TS
Cover image for eLearning Platform for Mobile Development
eLearning Platform for Mobile Development
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Cover image for Luxury Travel Agency
Luxury Travel Agency
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Cover image for Digital Sommelier
Digital Sommelier
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2
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Frontend Engineer(3)
David Pinheiro's avatar
David Pinheiro
Berlin, Germany
Full-Stack Dev · React, NestJS & AI integrations
New to Contra
Full-Stack Dev · React, NestJS & AI integrations
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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Cover image for AI integration OCR x API
AI integration OCR x API calls x data engineering 🧠
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Frontend Engineer(3)
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)