Freelance Backend Engineers in Masovian VoivodeshipFreelance Backend Engineers in Masovian Voivodeship
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Jacob Dzikowski's avatar
Jacob Dzikowski
proWarsaw, Poland
Fullstack Engineer | AI Engineer | 6+ years of experience
$5k+
Earned
2x
Hired
5.0
Rating
41
Followers
Fullstack Engineer | AI Engineer | 6+ years of experience
Cover image for AI Real Estate Agent Development
AI Real Estate Agent Development
0
11
Cover image for RAG AI Agent & Chatbot
RAG AI Agent & Chatbot
1
75
Cover image for AI/ML Engineering & Development
AI/ML Engineering & Development
9
640
Cover image for AI Agent for Financial Analysis & Data Scraping
AI Agent for Financial Analysis & Data Scraping
0
22
Backend Engineer(2)
Sergei Serafimovich's avatar
Sergei Serafimovich
Warsaw, Poland
From vision to product, without the chaos: https://aegte.dev
From vision to product, without the chaos: https://aegte.dev
Cover image for AI Assistant Backend Development for Comic Book App
AI Assistant Backend Development for Comic Book App
1
3
Cover image for Computer Vision Backend for Comic Book Cover Detection
Computer Vision Backend for Comic Book Cover Detection
1
9
Cover image for Christmas Sweater Image Editor Development
Christmas Sweater Image Editor Development
1
5
Cover image for OctoSale
OctoSale
1
7
Backend Engineer(2)
Wiktor Witkowski's avatar
Wiktor Witkowski
Warsaw, Poland
Software Engineer - Api, Automation, Scripts
Software Engineer - Api, Automation, Scripts
Cover image for Leasing Platform
Leasing Platform
0
9
Cover image for Microservices Architecture System
Microservices Architecture System
0
9
Cover image for Excel Automation
Excel Automation
0
10
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Backend Engineer(2)
Emerald Empire's avatar
Emerald Empire
Warsaw, Poland
We are studio that create dynamic premium sites and webapps
New to Contra
We are studio that create dynamic premium sites and webapps
Cover image for Symbolic Rocks Format: A full-fledged
Symbolic Rocks Format: A full-fledged SPA application in React 18 with 11+ pages. Features: Centralized state management (cart, user, chats, language, theme) via modern React hooks. Architecture: Functional components with advanced rendering logic, responsive product grids, custom routing. Localization: Automatic browser language detection + manual switching between RU, UZ, and EN. Features: Shopping cart, admin panel with CRUD operations, admin chat, authorization system, and user profile. Themes: A full-fledged light and dark theme with a signature purple-blue palette.
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130
Cover image for Symbolic Rocks Premium Landing Client Story The
Symbolic Rocks Premium Landing Client Story The artist initially sold unique paintings through Telegram. However, to reach a wider audience and test demand outside of the messenger, he needed a website. Emerald Empire Solution We developed a premium prototype landing page that became a tool for market validation and artwork presentation. The design was tailored to the client’s vision: highlighting the visual aesthetics and ensuring easy navigation. Results The landing page allowed testing demand beyond Telegram. While the main online store is still under development, the landing serves as a showcase and sales point. The paintings impressed the Emerald Empire team so much that we purchased 50% of his business, becoming partners in its growth. Key Features of the Landing Page Premium design emphasizing the artistic works. Simple structure for quick navigation. Future integration with the upcoming online store. Conclusion This case demonstrates how a premium prototype can serve not only as a market validation tool but also as the beginning of a strategic partnership between the studio and the client.
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51
Cover image for Symbolic Rocks Format Full-featured SPA built with
Symbolic Rocks Format Full-featured SPA built with React 18, comprising 11+ pages and optimized for production deployment. Architecture and Stack Functional components with advanced rendering logic and performance optimizations. Centralized state management for cart, user, chats, language, and theme implemented via modern React hooks and context patterns. Responsive product grids, custom routing, and client-side caching for snappy UX. Modular component library designed for reuse across product and admin interfaces. Localization and Themes Automatic browser language detection plus manual switching between RU, UZ, and EN. Full light and dark themes with a signature purple-blue palette and tokenized design tokens for easy theming. Core Features Shopping cart with persisted state and checkout flows. Authorization system and user profile management. Admin panel with CRUD operations for products, users, and content. Admin chat for internal support and moderation. Advanced product mechanics: filters, sorting, variant support, and conversion-focused interactions. Release Update and Enhancements Chat authorization requirement — creating persistent chats now requires user authentication; authenticated chats are saved to user history and support extended features. Guest chat support — ephemeral chat mode allows unregistered users to start conversations with limited lifetime and reduced functionality. Updated product cards — redesigned card layout with improved interactive states, quick actions (buy, wishlist, preview), variant selectors, and analytics hooks for conversion tracking. Admin panel modernization — enhanced CRUD workflows, role-based access control, bulk actions, improved analytics and activity logging, and streamlined chat/content management tools. Implementation Notes Chat flows: token-based authentication for persistent chats; guest mode creates temporary contexts that expire and are not persisted to the main database. UX considerations: clear guest limitations and prompts to register for history and advanced features; progressive disclosure for admin bulk operations. Handoff: component library and Figma assets, API specs for chat, auth, roles, and bulk endpoints, plus test cases for chat persistence and guest expiry.
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55
Cover image for Case Study: Zarafet Shop —
Case Study: Zarafet Shop — A Modern Multilingual E‑Commerce Platform Challenge The client needed an online store that would: Present products clearly and elegantly. Ensure a smooth and intuitive shopping experience. Work seamlessly across devices. Support multiple languages to reach a diverse audience in Uzbekistan. Solution We built Zarafet Shop, a sleek e‑commerce website focused on usability and aesthetics: 🛒 Product cards — clean layout with optimized images and clear structure. 📱 Responsive design — equally convenient on mobile, tablet, and desktop. ⚡ Streamlined checkout flow — minimal steps for maximum convenience. 🎨 Minimalist visual style — premium look that keeps the focus on products. 🌍 Multilingual support — the site is available in four languages: Russian, Uzbek, English, and Chinese, reflecting the most popular languages in Uzbekistan. 🔍 Performance optimization — fast loading times for a smooth shopping experience. Result Zarafet Shop demonstrates how an online store can be: functional, visually refined, user‑friendly, and accessible to a multilingual audience. This project reflects Emerald Empire’s philosophy: minimalist design, premium aesthetics, and attention to detail — tailored to both local and international users.
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73
Backend Engineer(1)
Yevhenii Rozov's avatar
Yevhenii Rozov
Warsaw, Poland
AI & Web3 dev: bots, scrapers, automations, apps, crypto
22
Followers
AI & Web3 dev: bots, scrapers, automations, apps, crypto
Cover image for 😍 Created payments flow +
😍 Created payments flow + admin dashboard for a mobile app: login, checkout, recurring subscription, invoices, and payment history. I used Stripe for payments (Checkout + Subscriptions) and Prisma for the database layer. Implemented webhook handling for subscription status updates, invoice history, and access control. Also built an admin dashboard to manage users, plans, and transactions.
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508
Cover image for 🚀 I recently built a
🚀 I recently built a custom AI automation system with 50+ AI agents designed to run business workflows automatically. The system includes specialized agents such as: • CEO agent (task coordination) • LinkedIn lead generation agent • Telegram lead finder • Email scraping & outreach agent • Job monitoring agent • AI response assistant • Data analysis agents All agents communicate through a centralized hub and can work 24/7 without manual supervision. The system handles tasks like: lead generation data scraping automated outreach monitoring opportunities workflow automation Tech stack used: Python • OpenAI / Claude • Automation agents • Web scraping • API integrations If you're looking to build custom AI agents for your business workflows, feel free to reach out.
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87
Cover image for 🚀 Content Marketing - My
🚀 Content Marketing - My Real Cases Over the past 5+ years I’ve been building and scaling crypto-focused content ecosystems, combining short-form video, Telegram growth, and performance-driven funnels. Here are some real numbers behind my work: • Built a crypto Telegram community to 25K+ subs, monetized via ads & partnerships • Reached 100K+ total followers across all social platforms • Created and published 10000+ content posts • Generated $200K+ total revenue through crypto content, traffic funnels, and marketing collaborations • Produced high-volume short-form content (TikTok / YouTube Shorts / Reels) • Created and launched my own crypto products and tools • Work with 100+ influencers • Built a full growth funnel & “content factory” - strategy, converting views into subscribers and revenue.
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623
Cover image for 🙌 Some of my Telegram chatbot development projects 1. PARSE...
🙌 Some of my Telegram chatbot development projects 1. PARSER + AI WRITER 2. TIKTOK Viral Scanner 3. YOUTUBE VIDEO TRANSLATOR 4. CRYPTO HEDGER 5. REPOST TT TO SHORTS And 20+ others
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327
Backend Engineer(1)
Jacek Adamski's avatar
Jacek Adamski
Warsaw, Poland
Frontend-Driven AI Full Stack | AI Automation & Headless CMS
New to Contra
Frontend-Driven AI Full Stack | AI Automation & Headless CMS
Cover image for Softr: Internal admin systems
Softr: Internal admin systems
0
147
Cover image for Paramark SaaS Marketing Analytics Platform Redesign
Paramark SaaS Marketing Analytics Platform Redesign
1
4
Cover image for Travala Online Booking Platform Redesign and Optimization
Travala Online Booking Platform Redesign and Optimization
1
6
Cover image for Cross-Platform AI SaaS Enhancement for Sintra
Cross-Platform AI SaaS Enhancement for Sintra
1
4
Backend Engineer(1)
Eugene Panchenko's avatar
Eugene Panchenko
Warsaw, Poland
AI Agents & Automation for Small Business & Hospitality
New to Contra
AI Agents & Automation for Small Business & Hospitality
Cover image for A private AI assistant that
A private AI assistant that runs on your own server and talks to you through Telegram. It remembers context across days, sends morning and evening digests, drafts replies in your voice, follows up on open threads, and monitors what you point it at — alerting you only when something needs a decision. Private by design: each person gets their own isolated assistant. Running in daily production use, multi-tenant from the start.
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91
Cover image for Telegram invoice bot: 484 documents, zero manual entry
Telegram invoice bot: 484 documents, zero manual entry
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4
Cover image for Market research you can act on — a decision brief
Market research you can act on — a decision brief
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72
Cover image for A monitor that does your
A monitor that does your job-searching for you: it polls job boards on a schedule, pulls in new postings, de-duplicates against what you've seen, and filters to the roles and criteria you care about. You get one daily digest instead of a dozen open tabs, plus a record of what you've applied to. New sources plug in as connectors, each tested against the live site so the monitor keeps working when a board changes format.
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88
Backend Engineer(1)