Alexandru Marius

SwiftUI + Python 3.10 (AWS Lambda) + PostgreSQL/pgvector + Amazon Bedrock (Claude 3.5) + Terraform

• Full-stack RAG application with hybrid semantic search (BM25 + dense cosine + HyDE + Reciprocal Rank Fusion)
• Python backend with 14+ REST endpoints, JWT auth, LRU embedding cache
• Terraform-managed VPC with private subnets; 62 backend pytest tests + 18 iOS unit tests

Python/FastAPI + Claude/Gemini + Docker Compose + Supabase

• Orchestrates multiple LLM providers with adaptive difficulty; SSE streaming; containerized deployment

React + TypeScript + AWS SAM/Lambda + Bedrock AI + Vitest

• Full-stack serverless app with AI-assisted writing, encrypted storage, and document export (DOCX/PDF)

Python/FastAPI + VADER + Transformers + Detoxify + spaCy

• Standalone microservice for sentiment analysis, toxicity detection, and empathy scoring

Operations & IT Services | Tier 3 Escalation Engineering | Remote

• Serve as a senior-level engineer in Amazon's Operations & IT Services group, providing advanced technical support across Windows, macOS, Linux, servers, network, and systems infrastructure
• Troubleshoot and resolve escalated incidents that Tier 1/2 teams are unable to fix, including complex hardware failures, OS conflicts, network outages, and server issues
• Support and maintain IT infrastructure in Amazon facilities (fulfillment centers, corporate sites, Whole Foods), including on-site deployment, racking, connectivity, and remote diagnostics
• Act as an escalation point during 24/7 incident response; prioritize issues based on SLA, business impact, and escalation policies
• Diagnose and resolve advanced technical issues on servers, networking devices, thin clients, printers/scanners, and handheld terminals
• Build automation (Python/Bash) to reduce recurring incident resolution time and eliminate manual processes
• Mentor Tier 1/2 engineers; develop knowledge base articles and deliver training sessions
• Collaborate with partner teams and vendors on change management and continuous improvement

Bucharest | 1 year

• Administered network services and enterprise infrastructure
• Automated workflows with WinAutomation and Power BI reporting
• Managed ticketing systems and cross-platform troubleshooting

Bucharest | 8 months

• Managed network servers, workstation deployment, and access controls
• Built internal wiki with technical documentation and IT policies
• Maintained systems security through backups, firewalls, and access management

Bucharest | 1 year 7 months

• Led regression testing teams and supervised trainee testers
• Performed root cause analysis on defects using systematic testing methodologies
• Executed functionality, compatibility, regression, and exploratory testing
• Managed test cases in TestRail; tracked defects in Jira and DevTrack

Mathematics-Informatics | Bucharest