Freelance Frontend Engineers in Berlin
Freelance Frontend Engineers in Berlin
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Andrii Tovstonos
Berlin, Germany
Expert Website Maintenance & High-Performance Optimization
New to Contra
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Expert Website Maintenance & High-Performance Optimization
1
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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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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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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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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28
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Dave Waldorf
Berlin, Germany
Full-stack engineer
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Full-stack engineer
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davewaldorf/Style-Me
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9
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davewaldorf/CMS
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9
0
Lava
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6
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Ömer Tarakci
Berlin, Germany
iOS Dev | UX Designer | Sales Manager
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iOS Dev | UX Designer | Sales Manager
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Intuitive Note-Taking App: A Figma Prototype Showcase
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7
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Quran Harmony 4+
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5
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iOS/Android/UI-UX/Sales
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7
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Marketing Strategy: Target Audience Identification
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1
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Francisc (Frankie) Toth
Berlin, Germany
Framer Expert · Web Design & Development for Founders
2x
Hired
5.0
Rating
83
Followers
expert
Club
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Framer Expert · Web Design & Development for Founders
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Sales for Freelancers
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34
0
developed the Product Actions page for Peec AI using Framer and custom components like the 3 Tab component and a custom accordion component.
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49
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Built & designed in Framer with a fully CMS-driven structure — making it effortless for the team to publish updates, improvements, and fixes without touching the layout.
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57
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New CLI Landing Page for Layercode AI
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22
Frontend Engineer
(1)
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Catalin Waack
pro
Berlin, Germany
10+ yrs exp: Engineer | Expert REACT/NEXT/TS
$10k+
Earned
1x
Hired
2
Followers
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10+ yrs exp: Engineer | Expert REACT/NEXT/TS
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eLearning Platform for Mobile Development
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8
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Luxury Travel Agency
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6
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Digital Sommelier
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2
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David Pinheiro
Berlin, Germany
Full-Stack Dev · React, NestJS & AI integrations
New to Contra
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Full-Stack Dev · React, NestJS & AI integrations
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Dashboard Agency
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10
1
Export API Youtube V3
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17
1
Phase-Radar - own product
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24
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AI integration OCR x API calls x data engineering 🧠
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2
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Abdul Rafay
Berlin, Germany
Full Stack Dev focused on Next.js, WordPress, Shopify, AI
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Full Stack Dev focused on Next.js, WordPress, Shopify, AI
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Sublet Directory - Easy Sublet Finder
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2
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Recovered WordPress Hacked Website
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2
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xsavr - scrapes post data from x.com
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3
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Matthias Jakisch
15 Petershagen-Eggersdorf, Germany
25+ Years Experienced Software Engineer (Front/Back/AI/API)
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25+ Years Experienced Software Engineer (Front/Back/AI/API)
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Additional Product Details, configurable | Codixio
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3
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Add Product / Discount via URL to Cart | Codixio
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4
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PreOrder Function for UpComing Products | Codixio
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2
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