Freelance Backend Engineers in Masovian Voivodeship

Freelance Backend Engineers in Masovian VoivodeshipFreelance Backend Engineers in Masovian Voivodeship

Projects People

+ 12 years Full-Stack & Data Engineer | CRM | AI Integration

1x: Hired

5.0: Rating

32: Followers

expert

+ 12 years Full-Stack & Data Engineer | CRM | AI Integration

Cover image for Stripe Payment Webhook Integration

Stripe Payment Webhook Integration

0

3

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

CRUD API Workflow (Create Record) with Buildship

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5

Cover image for OMA Health Marketing Website Development

OMA Health Marketing Website Development

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1

Cover image for FaithAwake Alarm App Development

FaithAwake Alarm App Development

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13

Backend Engineer(3)

Jacob Dzikowski

proWarsaw, Poland

Fullstack Engineer | AI Engineer | 6+ years of experience

$5k+: Earned

2x: Hired

5.0: Rating

34: Followers

Fullstack Engineer | AI Engineer | 6+ years of experience

Cover image for AI Real Estate Agent Development

AI Real Estate Agent Development

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4

Cover image for RAG AI Agent & Chatbot

RAG AI Agent & Chatbot

1

64

Cover image for AI/ML Engineering & Development

AI/ML Engineering & Development

9

484

Cover image for AI Agent for Financial Analysis & Data Scraping

AI Agent for Financial Analysis & Data Scraping

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10

Backend Engineer(2)

Sergei Serafimovich

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

2

Cover image for Computer Vision Backend for Comic Book Cover Detection

Computer Vision Backend for Comic Book Cover Detection

1

7

Cover image for Christmas Sweater Image Editor Development

Christmas Sweater Image Editor Development

1

4

Cover image for OctoSale

1

3

Backend Engineer(2)

Wiktor Witkowski

Software Engineer - Api, Automation, Scripts

Software Engineer - Api, Automation, Scripts

Cover image for Leasing Platform

Leasing Platform

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7

Cover image for Microservices Architecture System

Microservices Architecture System

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7

Cover image for Excel Automation

Excel Automation

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9

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Backend Engineer(2)

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

21: 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

493

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.

1

67

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

600

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

308

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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136

Cover image for Paramark SaaS Marketing Analytics Platform Redesign

Paramark SaaS Marketing Analytics Platform Redesign

1

3

Cover image for Travala Online Booking Platform Redesign and Optimization

Travala Online Booking Platform Redesign and Optimization

1

3

Cover image for Cross-Platform AI SaaS Enhancement for Sintra

Cross-Platform AI SaaS Enhancement for Sintra

1

3

Backend Engineer(1)

Full-Stack Engineer · AI & Real-Time Systems

New to Contra

Full-Stack Engineer · AI & Real-Time Systems

Cover image for Architected RESTful backend with Node.js,

Architected RESTful backend with Node.js, deployed on AWS Lambda for scalability. • Integrated AWS Kinesis for real-time stream processing and updates. • Implemented GraphQL (Apollo Server) endpoint for reporting dashboard. • Engineered FastAPI backend with SQLAlchemy ORM supporting 10,000+ concurrent translation jobs.

1

29

Cover image for AI Integration Boilerplate is a

AI Integration Boilerplate is a complete starting point for an AI web product: backend, frontend, database, and local infrastructure in one repo.

1

29

Cover image for A full-stack app with metamask

A full-stack app with metamask pairing, smart contracts interaction, which sends ethereum devnet tokens to campaign wallets. The platform enables users to create and manage crowdfunding campaigns, make donations, and track funding progress in real-time.

1

17

Cover image for Engineered WebSocket communication layer using

Engineered WebSocket communication layer using Node.js and CRDT strategies. • Leveraged Kafka for real-time event distribution and conflict resolution. • Improved session throughput by 60%.

1

20

Backend Engineer(2)

Lead Product & Full-Stack Engineer with 10+ years of exp.

New to Contra

Lead Product & Full-Stack Engineer with 10+ years of exp.

Cover image for Job Application Tracker

Job Application Tracker

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0

Cover image for BareScript language

BareScript language

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0

Cover image for Aleh Belski | Full-Cycle Software Partner

Aleh Belski | Full-Cycle Software Partner

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0

Cover image for Forensic Audit to Detect Billing Discrepancies

Forensic Audit to Detect Billing Discrepancies

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2

Backend Engineer(1)