Iurie Cristea
I am a Full-Stack Developer with 15+ years of experience in Go, Python, JavaScript and PHP, specializing in high-load systems, system architecture, and DevOps. I build custom applications end-to-end — from backend and APIs to modern, responsive frontends — and have led cross-functional teams and modernized legacy infrastructures. I train and fine-tune ML models (classification, information extraction) and build RAG systems with hybrid vector search and self-hosted LLMs.
I build custom systems: APIs, integrations, high-load systems, legacy modernization and AI/ML — end-to-end, from architecture to deployment.
- You work directly with the person who writes the code, not a sales manager.
- Your code and data stay yours — self-hosted, on request.
- I take over and modernize existing systems, not just build from scratch.
Full-stack web apps with modern, responsive interfaces — SPAs, dashboards, admin panels and client portals.
Corporate sites, landing pages and online stores — fast, mobile-friendly and SEO-ready.
Custom CRM, ERP and internal tools — process automation, booking, inventory and reporting tailored to your business.
Robust REST, gRPC and GraphQL services with clean data models and documented, maintainable APIs.
Architectures built to scale — performance tuning, caching and message queues (Redis, RabbitMQ, Kafka) for heavy traffic.
Third-party and e-government integrations, CI/CD pipelines, Docker and Kubernetes deployments.
Custom model training and fine-tuning (classification, information extraction) and RAG systems — semantic search over your data with self-hosted or cloud LLMs.
Technical consulting, architecture review and performance audits of existing systems — not just building from scratch.
- Designed and built a scalable backend system from scratch, acting as both architect and developer.
- Developed a platform connecting multiple vendors and buyers, ensuring reliability and data consistency.
- Defined system architecture, APIs, and core data models.
- Deployed and managed services on Kubernetes using Google Cloud Platform.
- Implemented CI/CD pipelines and ensured system performance, monitoring, and security.
- Trained and fine-tuned transformer models (XLM-RoBERTa, LoRA) for spam detection, support-ticket classification across 53 categories, and confirmation-number extraction (token classification + CRF), served via FastAPI on Kubernetes.
- Built RAG systems: hybrid retrieval (Qdrant, dense + sparse embeddings) with cross-encoder reranking and self-hosted LLMs (vLLM), plus a Text-to-SQL agent using schema retrieval over 300+ database tables.
- Deep Modernization of B2G API
- Overhauled the API layer for seamless communication between services in a legacy project.
- Integrated modern technologies to enhance system performance and maintainability.
- 999.md — Moldova's largest aggregator
- Led development of the "Booster" functionality: reduced RAM consumption and increased processing speed by ×1000.
- Revamped core architecture for scalability and stability.
- Architectural decisions, team coordination, code reviews, backend development.
- studii.md — Electronic Diaries & Grade Books
- Developed an online platform for parents, teachers, and students.
- Applied Machine Learning and Data Science for advanced analytics.
- achizitii.md — Public Procurement & Auctions
- Modernized procurement platform backend.
- Integrated with Mpay, Mpass, Msign (e-government services).
- eGrădinița.md — Kindergarten Enrollment
- Full backend development for kindergarten enrollment management in Chișinău.
- Designed and developed web solutions for various clients, including e-commerce and event services platforms.
- Designed and maintained company websites and custom applications.
- Administered servers and networks, ensuring uptime, performance, and security.
- Developed Moldova's first dental software program.
- Full stack: Frontend + Backend + DevOps.