Freelancers for "Engineering" in San Francisco
Freelancers for "Engineering" in San Francisco
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Igor Khatybov
pro
Huntsville, USA
Clean up tech messes. Plan for growth. No drama.
$50k+
Earned
1x
Hired
5.0
Rating
9
Followers
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Clean up tech messes. Plan for growth. No drama.
0
From AWS to WPEngine: A Clean Migration Blueprint
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20
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GA4 Migration and Multi-Platform Analytics Setup
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11
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Subscription Recovery Integration with Vindicia
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9
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Architecture Roadmap for Subscription Management Overhaul
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10
Systems Engineer
(2)
Platform Engineer
(2)
Data Engineer
(2)
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Alexandru X
Warsaw, Poland
Polymath | Strategic Innovator | Versatilist
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Polymath | Strategic Innovator | Versatilist
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Multi-VM Honeypot Network Setup and Log Analysis
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14
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AI Data Extraction and Processing
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21
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Automation System - SEO/Marketing Agency
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25
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Łukasz Bazan
Głogów Małopolski, Poland
Fractional AI Architect | Deterministic GraphRAG Expert
New to Contra
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Fractional AI Architect | Deterministic GraphRAG Expert
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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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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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78
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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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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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92
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(2)
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Neil Hanlon
Bedford, USA
Open Source Infrastructure Expert & Linux Guru
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Open Source Infrastructure Expert & Linux Guru
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Resilient Monitoring Stack for Hybrid Infrastructure
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15
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Deployment Stack Revamp with IaC and GitOps
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19
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Zero-Trust Mesh VPN with Nebula
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4
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Pablo Pelaez Fundora
Phoenix, USA
Systems Engineer: C++, Linux, & Autonomous Security.
New to Contra
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Systems Engineer: C++, Linux, & Autonomous Security.
1
Openbot Semantic Firewall Development
1
1
0
ASA DataFest Arizona Data Analysis under NDA
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20
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Autonomous AI agents pose serious security risks when executing unverified system actions. To solve this, our team built an OS-level security layer and telemetry pipeline to safely sandbox and monitor any autonomous agent
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29
1
Chess: Evolve is a roguelite tower-defense game where you deploy chess pieces as units and defend your King from waves of enemies. Each run gives you a random set of piece cards. Drag to place them on the board, or sacrifice cards to gain mana and redraw!
1
42
Systems Engineer
(2)
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(1)
Data Engineer
(1)
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Pavlo Krasnytsia
Lviv, 79000
Tech Leader | AI, Blockchain & Technology Architect
New to Contra
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Tech Leader | AI, Blockchain & Technology Architect
1
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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171
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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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162
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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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123
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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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115
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(1)
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(1)
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Cory Schmaltz
Denver, USA
Full Stack Engineer & AI System Architect & Network Engineer
New to Contra
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Full Stack Engineer & AI System Architect & Network Engineer
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Obsidian Network Architect
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23
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NLP pipeline for Federal Document Processing
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22
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Logistics System for US Army
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21
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AI-Powered Automatic Marketing System
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29
Security Engineer
(1)
Systems Engineer
(1)
Data Engineer
(1)
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Grey Newell
Atlanta, USA
Expert AWS consulting, AI solutions, and machine learning.
$100k+
Earned
1x
Hired
13
Followers
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Expert AWS consulting, AI solutions, and machine learning.
1
Schema-Driven Astro Starter Kit Development
1
22
1
musegpt: Local LLMs in your Digital Audio Workstation!
1
20
2
Event-Driven Resilience & Invoice Processing at Scale
2
45
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