Full Stack · Backend & AI Developer
Hi, I'm Thiago Mandrik
I'm a full-stack developer focused on backend and AI. I handle the behind-the-scenes — APIs, data and automation — turning ideas into solid products ready to scale.
Tooling
The technologies I use to build and run production systems.
Track record
From data analysis to backend & AI technical leadership.
Technical and coordination lead across three projects: logistics routing (.NET 8 → FastAPI migration), hotel management and an AI-agent market research platform (LangChain/LangGraph).
AI agents and NLP pipelines with LangChain/LangGraph integrated to OpenAI and Anthropic. FastAPI APIs with Pydantic and JWT. AWS cost optimization (ECS, RDS, SQS, Lambda) with Grafana/Prometheus observability.
Technical lead on full-stack apps with Django and React, RESTful API design and data modeling. LLMs with LangChain for fiscal-document insight extraction. Java legacy refactoring and AWS cost management.
Internal systems in Django — notably a corporate Helpdesk (tickets, SLA and dashboards). PHP (Laravel) and Django legacy maintenance, Python automations and BI dashboards with Qlik and SQL.
Selected work
Three production systems I led and built at WK Technology.
Technical lead on the full backend conception and build: architecture definition, stack selection and data pipeline design. Orchestration of AI agents with LangChain/LangGraph integrated to LLMs for automatic analysis and insight generation.
Built and maintained RESTful APIs for bookings, occupancy and operational management, ensuring performance and scalability of the production solution.
Backend technical lead and frontend coordination. Led the full migration of a legacy .NET 8 API to FastAPI (Python), rethinking architecture, authentication, access control and external integrations.
Background
Contact
Open to backend, full-stack and AI roles. Reach out through the channels below.