Freelance Backend Engineers in Masovian Voivodeship

Freelance Backend Engineers in Masovian VoivodeshipFreelance Backend Engineers in Masovian Voivodeship

Projects People

pro

Full-Stack Engineer | Replit & Cursor | AI Integration

5.0: Rating

23: Followers

expert

Full-Stack Engineer | Replit & Cursor | AI Integration

Cover image for OMA Health Marketing Website Development

OMA Health Marketing Website Development

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1

Cover image for Stripe Payment Webhook Integration

Stripe Payment Webhook Integration

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1

Cover image for CRUD API Workflow (Create Record) with Buildship

CRUD API Workflow (Create Record) with Buildship

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2

Cover image for Founder Portfolio — Product Builder & Co-Founder Website

Founder Portfolio — Product Builder & Co-Founder Website

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4

Backend Engineer(3)

Sergei Serafimovich

From vision to product, without the chaos: https://aegte.dev

New to Contra

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

0

Cover image for Computer Vision Backend for Comic Book Cover Detection

Computer Vision Backend for Comic Book Cover Detection

1

1

Cover image for Christmas Sweater Image Editor Development

Christmas Sweater Image Editor Development

1

1

Cover image for OctoSale

1

1

Backend Engineer(2)

Wiktor Witkowski

Software Engineer - Api, Automation, Scripts

Software Engineer - Api, Automation, Scripts

Cover image for Microservices Architecture System

Microservices Architecture System

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5

Cover image for Leasing Platform

Leasing Platform

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4

Cover image for Excel Automation

Excel Automation

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5

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Backend Engineer(2)

pro

AI & Web3 dev: bots, scrapers, automations, apps, crypto

17: 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.

27

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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.

3

538

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

3

241

Cover image for 👍 MVP mobile app for learning English for beginners Tech st...

👍 MVP mobile app for learning English for beginners Tech stack: Flutter (Dart) - iOS & Android - Audio-based quizzes/UI-UX.

2

3

283

Backend Engineer(1)

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

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63

Cover image for Secure Crypto Brokerage Platform Development

Secure Crypto Brokerage Platform Development

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2

Cover image for Luaka Bop Digital Music Platform

Luaka Bop Digital Music Platform

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1

Cover image for VannaAI Text-to-SQL over private databases

VannaAI Text-to-SQL over private databases

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60

Backend Engineer(1)