Founding Engineer (Core Full-Stack) @ Mainder · Automation / Integrations / AI Systems
📍 Barcelona, Spain

I build production software across backend, frontend, automation, and infrastructure.
Most of my work sits at the intersection of integrations, worker systems, automation, and LLM-enabled workflows.

Frontend

• Next.js · React · TypeScript
• Tailwind · shadcn/ui

Backend

• Ruby on Rails · Node.js (ecosystem)
• Worker systems, scheduled execution, and job orchestration

Databases

• PostgreSQL · MySQL · MongoDB

Infra / Ops

• AWS (Flow & Ops)
• Railway
• Docker

Jobs / Queues

• Sidekiq
• Redis (queues, coordination, rate limiting patterns when needed)

Automation / Scraping

• Python · Playwright
• Browserless orchestration
• Robust automations (timeouts, retries, UI variance, popups/modals)

APIs / Integrations

• Third-party API integrations
• Webhooks, API contracts, authentication flows, and reliability patterns

LLMs / AI

• OpenAI · Gemini · Perplexity (API-driven workflows)
• Prompt-based automation patterns and structured outputs

AI Coding / Dev Tools

• Cursor · Codex · Claude Code
• MCP-based integrations to automate coding + operational workflows

I’m a founding engineer at Mainder (HRTech / Recruiting SaaS). We built the product from the start and we’ve owned critical systems across core backend, automation, and frontend:

• We designed and implemented the multiposting system as a Ruby on Rails microservice
• We built execution + orchestration around Redis + Sidekiq (scheduled/background workloads)
• We worked on database workflows, reliability patterns, and operational robustness

• We built and maintained backend workflows connecting product features, integrations, and data integrity
• We implemented production-grade worker flows and third-party API integrations

• I’m currently focused on the frontend with Next.js + TypeScript
• I’m reworking product flows with a modular, maintainable architecture

• I rebuilt the InfoJobs Worker: an autonomous worker that scrapes InfoJobs and performs actions inside the portal
• Implemented in Python + Playwright, designed to run end-to-end without manual intervention
• Built to handle layout changes, dynamic UI behavior, and real-world variance

I collaborate with TRAQEER on automation systems for detection + enforcement:

• Automated DMCA form submissions end-to-end (Playwright-based flows)
• Built pirated content discovery via search queries using ScrapingDog
• Integrated with the public Reddit API to find/report content and support takedown workflows
• Redesigning the onboarding flow with React

I built an AI conversational bot for an e-commerce context:

• Conversation flows for discovery, support, and product guidance
• Backend integrations to connect the assistant with catalog and business logic

• Email: emilianorozas@gmail.com
• Website: https://emiliano-rozas.com/
• LinkedIn: https://www.linkedin.com/in/emilianorozas/
• GitHub: https://github.com/HxrmxStudio