Freelance Backend Engineers in Masovian Voivodeship
Freelance Backend Engineers in Masovian Voivodeship
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Sergei Serafimovich
Warsaw, Poland
From vision to product, without the chaos: https://aegte.dev
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From vision to product, without the chaos: https://aegte.dev
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AI Assistant Backend Development for Comic Book App
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Computer Vision Backend for Comic Book Cover Detection
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Christmas Sweater Image Editor Development
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OctoSale
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Backend Engineer
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Wiktor Witkowski
Warsaw, Poland
Software Engineer - Api, Automation, Scripts
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Software Engineer - Api, Automation, Scripts
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Microservices Architecture System
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5
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Leasing Platform
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Excel Automation
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Yevhenii Rozov
Warsaw, Poland
AI & Web3 dev: bots, scrapers, automations, apps, crypto
21
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AI & Web3 dev: bots, scrapers, automations, apps, crypto
27
😍 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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🚀 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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🚀 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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🙌 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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Backend Engineer
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Jacek Adamski
Warsaw, Poland
Frontend-Driven AI Full Stack | AI Automation & Headless CMS
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Frontend-Driven AI Full Stack | AI Automation & Headless CMS
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Softr: Internal admin systems
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133
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Paramark SaaS Marketing Analytics Platform Redesign
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Travala Online Booking Platform Redesign and Optimization
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Cross-Platform AI SaaS Enhancement for Sintra
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Backend Engineer
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