Architecting high-volume systems and agentic AI infrastructure.
Full-stack engineer & technical consultant specialized in scalable backend solutions, database optimization, distributed queues, microservices, and enterprise RAG systems handling multi-terabyte datasets.
01 / Industrial Experience
7 rolesSenior Software Engineer
Building highly scalable, multi-distributed services — heavy backend, computation, and data migrations on AWS, with Lambda-based serverless workloads across a global affiliate network.
Technical Consultant & Architect — Full-Stack (Contract)
Leading a 3-engineer team delivering a large-scale Law Case Management System for hundreds of users across ERP, legal operations and cross-functional teams. Owning architecture, infrastructure, and AI systems end-to-end.
Deployed AI RAG (Gemini + OCR) over 3TB+ vector data in Qdrant — secure semantic search across millions of records.
Multi-layer agent flow: query routing, tool orchestration, reranking, parallel search — for high-accuracy retrieval.
AWS via CloudFormation with full CI/CD across dev / staging / prod. Microsoft Outlook, Azure AD, OneDrive, Blob integrations.
Database & backend designed for millions of entities and high-volume transactional workloads.
Full-stack Developer (Contract)
Maintaining and extending an internal operations dashboard across warehouse, cold callers, pickers and couriers — automating gift validation, courier dispatch, and delivery status tracking.
Full-stack Developer (Full-time)
Built and maintained internal dashboard + backend (5 Java microservices) for Winston, Ploom, Sobranie, Camel — orders, online payments, invoicing, inventory, FAN Courier integrations.
Manipulated and optimized 50B+ customer actions and data from 4M+ clients via Kafka clusters & clustering algorithms (k-means).
Rewrote entire app UI in Next.js 14 (from Angular 1) — added roles, QR/Datamatrix/Barcode scanning with phone & ZEBRA scanner.
Founder & Engineer
Built and launched LazySEO — a full-stack AI SEO platform that automates the entire content pipeline from keyword research to publishing. Live with paying customers.
Bump (fast/cheap) vs Smart (multi-step reasoning) with automatic mode selection based on article complexity.
Distributed processing with Bull + Redis — parallel article generation, retries, priority queues, fault-tolerant workers.
Founder & Engineer
Autonomous growth engine for LinkedIn. Proprietary Voice DNA engine dissects past high-performing content to replicate tone — built on a 100k+ viral post dataset.
Full Stack Developer
Integrated a new payment processing system reducing transaction fees, led a platform redesign boosting retention, and set up server infrastructure with Nginx load balancing.
02 / Selected Systems
11 projectsVisiTrack
SaaS · Visitor Tracking
Visitrack.app — live product for tracking and analyzing visitor activity, built and shipped end-to-end.
Outsoci
SaaS · Live
Live product at outsoci.com — designed, built and shipped as a full-stack system.
LetsLaunch
SaaS · Live
Live product at letslaunch.today — designed, built and shipped as a full-stack system.
Devista Legal RAG
Enterprise · Agentic AI
Multi-layer agentic RAG over 3TB+ of legal documents. Gemini + OCR ingest, Qdrant vector search, query routing, tool orchestration, reranking, parallel retrieval — serving hundreds of legal professionals.
- ▸3TB+ indexed across millions of records
- ▸Sub-second semantic search
- ▸AWS CloudFormation · full CI/CD
LazySEO
SaaS · AI Orchestration
Autonomous SEO platform — research → outline → generation → fact-check → SEO → publish. Dual-mode AI orchestration with automatic complexity routing. 44+ built-in SEO tools, multi-tenant dashboard, Stripe billing.
- ▸2,500+ word articles, fully automated
- ▸BullMQ + Redis distributed workers
- ▸Perplexity / Google / Gemini grounding
LinkPilot
AI Growth Engine
Autonomous LinkedIn growth for B2B founders. Proprietary Voice DNA replicates tone, library of 100k+ viral posts powers structural framework detection. Competitor intel, viral theme tracking, automated scheduling.
- ▸100k+ viral post dataset
- ▸Persona-tailored strategy
- ▸300%+ engagement lift
PaperChat
RAG · Documents
AI chat over PDFs. tRPC for end-to-end type safety, Pinecone for tokenized retrieval, Stripe subscriptions, Google Analytics, OpenAI streaming.
notiq.study
AI Note Generation
Turns YouTube videos into structured study notes — transcript ingest, semantic chunking, AI-generated outlines and summaries.
Outbound Enrichment
AI · Sales Automation
Lead enrichment from CSV / LinkedIn URLs. AI analyzes background, education, interests, socials — and writes uniquely personalized outbound emails at scale via RabbitMQ workers.
Collaborative Whiteboard
Realtime · Sockets
Multi-user canvas — room join/leave events, live participant count, synchronized drawing via sockets.
Pathfinding Visualiser
Algorithms · Viz
Animated grid pathfinding — Dijkstra, A*, BFS, DFS. Draw walls, control animation speed, switch algorithms live.
03 / Engineering Core
Languages
- TypeScript / Node.js
- Java / Spring Boot
- Python (AI/Data)
- SQL / PL-SQL
Frameworks
- Next.js 14
- NestJS
- Express
- React
- Spring Boot
AI / RAG
- Gemini · OpenAI
- Qdrant · Pinecone
- OCR pipelines
- Agentic orchestration
Data & Queues
- PostgreSQL · MongoDB
- Kafka · RabbitMQ
- Redis · BullMQ
- Vector DBs
Infra & DevOps
- AWS · CloudFormation
- Docker · Nginx
- GitHub Actions
- Linux
Integrations
- Stripe · Paddle
- Azure AD · OneDrive
- MS Outlook
- FAN Courier · ZEBRA
Academic
Master's — Data Modeling, Warehousing & DBA
University POLITEHNICA of Bucharest · 2023 – 2025
Bachelor's — Computer Science
University POLITEHNICA of Bucharest · 2019 – 2023
What I do best
Heavy backend. Database design and query optimization at scale. Async processing, queues, microservices. Production-grade RAG and agentic LLM systems. Full ownership of architecture, infrastructure, and delivery — from CloudFormation templates to the front-end pixels.
04 / Get in touch
Building something that needs to scale?
Available for technical consulting, architecture work, and senior full-stack roles. Remote-first, based in Bucharest.
Contact
- linkedin.com/in/costin-gheorghe →
- Bucharest, Romania
- Remote — global