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Głogów Małopolski, Poland

Fractional AI Architect | Deterministic GraphRAG Expert

New to Contra

Fractional AI Architect | Deterministic GraphRAG Expert

Cover image for PAY-SENTINEL is a highly deterministic

PAY-SENTINEL is a highly deterministic architectural framework designed to eliminate financial leakage in FinTech refund and payment automation pipelines. This document is a redacted portfolio version of the Master Blueprint, demonstrating how to replace probabilistic "AI Wrappers" with hard, stateful logic. The primary achievement of this architecture is the complete eradication of "Semantic Drift" and False Approval Rates (FAR). By weaponizing Pydantic V2 and GraphRAG, the system incarcerates stochastic AI outputs within rigid JSON schemas, forcing 100% SLA and KYC compliance before any transaction API is triggered. [ARCHITECTURAL IP & LIABILITY NOTICE] This document is a redacted sample of a Master Engineering Blueprint. It is intended exclusively for demonstrating architectural methodology and strategic framework design. It does not constitute a completed engineering source of truth for any third-party production environment. All proprietary frameworks and "Zero-Trust Fail-Safe" methodologies contained herein are the exclusive intellectual property of Łukasz Bazan. As a Fractional Architect, I provide the "Engineering Brain." I do not perform direct application coding. Any attempt to implement these patterns by internal teams is done at the Client’s own risk.

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Cover image for NEXUS-FORGE is a proprietary Tier-0

NEXUS-FORGE is a proprietary Tier-0 architecture designed for global supply chains operating on enterprise-grade ERP systems (SAP/Oracle). This document is a redacted portfolio version of the Master Blueprint, which eliminates the risk of "Stochastic Deadlock" and API Exhaustion by implementing an Asynchronous Sidecar pattern. The primary achievement of this architecture is the transformation of unpredictable AI forecasts into a deterministic "Digital Twin" model powered by a Neo4j Knowledge Graph. This enables the prediction of cascading failures and the calculation of a logistical "Blast Radius" with mathematical precision, completely isolating core operational databases from probabilistic AI models. [ARCHITECTURAL IP & LIABILITY NOTICE] This document is a redacted sample of a Master Engineering Blueprint. It is intended exclusively for demonstrating architectural methodology and strategic framework design. It does not constitute a completed engineering source of truth for any third-party production environment. All proprietary frameworks and "Zero-Trust Fail-Safe" methodologies contained herein are the exclusive intellectual property of Łukasz Bazan. As a Fractional Architect, I provide the "Engineering Brain." I do not perform direct application coding. Any attempt to implement these patterns by internal teams is done at the Client’s own risk.

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Cover image for LEX-SENTINEL is an advanced legal

LEX-SENTINEL is an advanced legal engineering architecture designed for high-stakes Mergers & Acquisitions (M&A). This document is a redacted portfolio version of the Master Blueprint, showcasing how to eliminate the severe legal liabilities (such as "Frankenstein Clauses") generated by probabilistic Naive RAG systems. The primary achievement of this architecture is the deployment of a Spatial Knowledge Graph. Instead of destroying document structure through standard OCR, the system maps exact (X, Y) coordinates of legal PDFs. It guarantees a 100% verifiable, Zero-Paraphrase policy, compressing cross-document liability analysis from weeks to sub-minute, mechanically verifiable audits. [ARCHITECTURAL IP & LIABILITY NOTICE] This document is a redacted sample of a Master Engineering Blueprint. It is intended exclusively for demonstrating architectural methodology and strategic framework design. It does not constitute a completed engineering source of truth for any third-party production environment. All proprietary frameworks and "Zero-Trust Fail-Safe" methodologies contained herein are the exclusive intellectual property of Łukasz Bazan. As a Fractional Architect, I provide the "Engineering Brain." I do not perform direct application coding. Any attempt to implement these patterns by internal teams is done at the Client’s own risk.

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Cover image for CYBER-AEGIS is a proprietary Tier-0

CYBER-AEGIS is a proprietary Tier-0 architecture designed for Enterprise Security Operations Centers (SOC). This document is a redacted portfolio version of the Master Blueprint, showcasing an autonomous SOC Swarm engineered to eliminate Alert Fatigue and probabilistic hallucinations. The primary achievement of this architecture is the mechanical grounding of SIEM logs within a Zero-Trust Knowledge Graph (Neo4j). By utilizing OCSF normalization and a LangGraph Swarm, the system compresses the Mean Time To Detect (MTTD) for complex threats from days to sub-minute resolution, algorithmically rejecting over 90% of false-positive noise before human escalation. [ARCHITECTURAL IP & LIABILITY NOTICE] This document is a redacted sample of a Master Engineering Blueprint. It is intended exclusively for demonstrating architectural methodology and strategic framework design. It does not constitute a completed engineering source of truth for any third-party production environment. All proprietary frameworks and "Zero-Trust Fail-Safe" methodologies contained herein are the exclusive intellectual property of Łukasz Bazan. As a Fractional Architect, I provide the "Engineering Brain." I do not perform direct application coding. Any attempt to implement these patterns by internal teams is done at the Client’s own risk.

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Data Engineer(4)

Security Engineer(3)

Systems Engineer(2)

Full-Stack & AI Dev | TypeScript, Next.js, React, Node

$25k+: Earned

4x: Hired

5.0: Rating

59: Followers

Full-Stack & AI Dev | TypeScript, Next.js, React, Node

Cover image for Containerized Automated Quality Control Pipeline

Containerized Automated Quality Control Pipeline

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5

Cover image for Landing page for an ai

Landing page for an ai company.

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499

Cover image for Langflow Multi-Agent Research Framework Development

Langflow Multi-Agent Research Framework Development

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Cover image for Roxy: Premium HYROX Training App Development

Roxy: Premium HYROX Training App Development

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12

Systems Engineer(2)

Mobile Engineer(1)

Platform Engineer(1)

PADMANAVA PARUI

Bengaluru, India

Full-Stack Dev | React, Node & FastAPI | Fixing bugs fast.

New to Contra

Full-Stack Dev | React, Node & FastAPI | Fixing bugs fast.

Cover image for Economic Intelligence Dashboard: Predictive Modeling

Economic Intelligence Dashboard: Predictive Modeling & Real-Time Visualization: Architected a high-fidelity full-stack platform designed to aggregate and visualize macroeconomic indicators from the World Bank Open Data API. This project combines live data orchestration with machine learning to provide predictive insights into global GDP, inflation, and labor trends. Technical Deep-Dive: Data Pipeline: Engineered a Python/Flask backend to normalize and serve real-time macroeconomic data, ensuring consistent data structures across diverse international sources. Predictive Analytics: Implemented a regression-based forecasting tool that utilizes historical time-series data to project future GDP growth with interactive user-input variables. Geospatial & Statistical UI: Developed a responsive frontend using React and Leaflet.js, featuring dynamic map hotspots and complex statistical overlays using Plotly. Insight-Driven Design: Optimized the platform for data storytelling, allowing users to reveal hidden correlations between variables like inflation and unemployment through interactive scatter plots.

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Cover image for Enterprise News Aggregator: Clean Architecture

Enterprise News Aggregator: Clean Architecture & State Orchestration: Architected a production-ready news aggregation platform using Flutter and Dart, centered on strict Clean Architecture principles and the MVVM pattern. This project serves as a blueprint for scalable, decoupled application design, featuring an event-driven state management system (BLoC). Technical Deep-Dive: State Orchestration: Leveraged the BLoC pattern to handle complex UI states, ensuring a strictly reactive and predictable data flow. Scalable Architecture: Implemented a decoupled Data Layer with the Repository Pattern, allowing for seamless swapping of data sources (e.g., GNews, NewsData) without affecting business logic. Advanced Networking: Engineered a robust networking layer using Dio, featuring custom interceptors for error logging and automated retry logic. Optimized UX: Developed a "Smart Search" functionality with debouncing to minimize API overhead and improve client-side performance.

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Cover image for Autonomous Task Orchestration & Power

Autonomous Task Orchestration & Power Grid Simulation Engine:

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Cover image for B2B (Bike Sharing) Demand Forecasting

B2B (Bike Sharing) Demand Forecasting & Seasonality Engine

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Mobile Engineer(1)

Systems Engineer(1)

Data Engineer(1)

Polymath | Strategic Innovator | Versatilist

Polymath | Strategic Innovator | Versatilist

Cover image for Multi-VM Honeypot Network Setup and Log Analysis

Multi-VM Honeypot Network Setup and Log Analysis

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Cover image for AI Data Extraction and Processing

AI Data Extraction and Processing

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Cover image for Automation System - SEO/Marketing Agency

Automation System - SEO/Marketing Agency

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Data Engineer(2)

Security Engineer(1)

Systems Engineer(1)

Pavlo Krasnytsia

Tech Leader | AI, Blockchain & Technology Architect

New to Contra

Tech Leader | AI, Blockchain & Technology Architect

Cover image for Built a secure key management

Built a secure key management and programmable policy platform for Web3 infrastructure, enabling teams to enforce transaction rules, automate approval logic, and protect sensitive signing workflows using hardware-backed controls. This project signals senior-level expertise in security architecture, backend systems, and blockchain operations.

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Cover image for Created a real-time blockchain data

Created a real-time blockchain data platform that streams on-chain data into developer and analytics workflows with low-latency pipelines, indexing, and database delivery. This project showcases strong full-stack architecture, data engineering, and blockchain infrastructure capabilities for modern financial applications.

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Cover image for Developed a real-time on-chain threat

Developed a real-time on-chain threat detection platform that monitors smart contracts, wallets, governance actions, and protocol activity to surface emerging attacks before damage occurs. This project demonstrates strong blockchain security engineering, alerting architecture, and production-grade risk monitoring at scale.

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Cover image for Developed AI-powered semantic search systems

Developed AI-powered semantic search systems using Weaviate as the core vector database. Designed hybrid search (keyword + vector) architecture and integrated large language models for contextual retrieval and summarization. Optimized schema design, embedding pipelines, and indexing strategies to support large-scale document corpora and conversational AI systems.

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Security Engineer(2)

Systems Engineer(1)

Data Engineer(1)

Ship your SaaS MVP in weeks - web, mobile, payments.

$10k+: Earned

14x: Hired

4.9: Rating

87: Followers

Expert

Mentor

+1

Ship your SaaS MVP in weeks - web, mobile, payments.

Cover image for Unexposed – The Document Vault That Can't See Your Documents

Unexposed – The Document Vault That Can't See Your Documents

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Cover image for Cross Platform Mobile App development

Cross Platform Mobile App development

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Cover image for Togethr – Turn Community Voice into Product Momentum

Togethr – Turn Community Voice into Product Momentum

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Cover image for Introducing Realm - Your *full-stack

Introducing Realm - Your *full-stack Saas Template* for launching your next software product in a day. Available on Contra: Check it out (https://contra.com/products/c7HPzB4W-realm-convex-tan-stack-saa-s-starter) Realm gives you all the plumbing you need so you can focus on your core product feature. It comes with: ✅ Better-auth - Authentication with Org, Member, Roles, Permissions and Invitation. ✅ Convex - Real-time backend with database, file storage . ✅ Stripe and Polar - Payment with lifecycle management for subscription - Choose your preference. ✅ Autosend - Transactional and Marketing email with email templates and webhook setup. ✅ S3 Seam - File storage for private or public file upload to any S3 storage provider of choice - S3, R2, Tigris, etc. ✅ Tanstack Start - Modern web framework - Optimized for Speed, SEO and perfomance. ✅ Dinachi UI - Prebuilt 40+ accessible React UI Component. Live demo at: https://dub.sh/realm-launch

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Mobile Engineer(1)

Security Engineer(1)

Software Engineer · iOS/Android · Big Data · AI · UX/UI

$5k+: Earned

2x: Hired

5.0: Rating

68: Followers

expert

expert

+6

Software Engineer · iOS/Android · Big Data · AI · UX/UI

Cover image for Hospitality & Retail - Scalable AWS Data Engineering Pipeline

Hospitality & Retail - Scalable AWS Data Engineering Pipeline

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Cover image for Epos Now - Azure-Powered Data Engineering Pipeline

Epos Now - Azure-Powered Data Engineering Pipeline

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Cover image for UBER - Data Engineering Project with GCP

UBER - Data Engineering Project with GCP

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Cover image for Automated ELT Pipeline Development

Automated ELT Pipeline Development

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Data Engineer(13)

Mobile Engineer(3)

proKarachi, Pakistan

Helping you ship your MVP in 2 weeks

$10k+: Earned

7x: Hired

5.0: Rating

21: Followers

Helping you ship your MVP in 2 weeks

Cover image for Student Grit Score Data System

Student Grit Score Data System

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Cover image for The Student Grit Score Data

The Student Grit Score Data System is a real-time, effort-focused performance tracking system designed to replace traditional report cards with continuous feedback centered on consistency, engagement, and growth. The system captures daily teacher-observed signals across effort, mastery, reading, and behavior, calculates a daily and weekly Grit Score, and presents insights through clear, role-appropriate dashboards for teachers and parents.

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Cover image for Maqsad - Large-Scale EdTech Mobile Application

Maqsad - Large-Scale EdTech Mobile Application

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Cover image for Misk Events Platform - Enterprise Events & Programs App

Misk Events Platform - Enterprise Events & Programs App

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3

Data Engineer(2)

Mobile Engineer(1)