Mariusz Εazarz
Software Engineer & AI Developer
AI-focused Fullstack Engineer building scalable backend systems, cloud infrastructure, and intelligent automation β bridging backend engineering with LLMs, RAG, and vector search.
Who I Am
About Me
3+
Years Exp.
AI-focused engineer building intelligent, scalable systems
I'm an AI-focused Fullstack Engineer with 3+ years of experience building scalable backend systems, cloud infrastructure, and AI-powered automation features. I combine strong backend engineering skills β Node.js, Python, FastAPI, REST β with modern AI tooling: LLMs, RAG pipelines, embeddings, vector search, OCR, and autonomous agents.
I design secure, modular, and maintainable systems deployed on AWS (EC2, Lambda, IAM, S3), Dockerized environments, and CI/CD pipelines. I care deeply about clean architecture β defining clear module boundaries, data flows, and API contracts that make systems easy to extend and onboard into.
At Havenocode I work as an AI Software Engineer β shipping production platforms that automate public tender submissions, process scanned contracts with OCR, power multilingual service marketplaces, and handle large-scale investment operations with enterprise-grade auth and GDPR compliance.
Previously at Piwik PRO as a Technical Support Engineer, where I built internal tooling, automated data pipelines, and shipped an OpenAI-powered chatbot that resolved 70% of client queries automatically.
Portfolio
My Work
A selection of projects spanning full-stack web development, AI/ML systems, and API engineering.
AI Digest Newsfeeder
Newsfeeder is an automated AI/ML news digest tool that aggregates articles from 27+ RSS feeds, filters them by keywords, and summarizes each one using OpenAI GPT-4o-mini. It also tracks Claude Code changelog updates and delivers everything as a formatted HTML email via Gmail SMTP. Designed to run daily via cron with persistent state to avoid duplicate notifications.
Expertise
My Skills
Technologies and tools I work with daily β hover to pause.