I build and support production software across web, mobile, backend APIs, cloud infrastructure, automation, and LLM-enabled workflows.
- Full-stack product delivery with Flutter, Python/FastAPI, TypeScript, React/Next.js, REST APIs, PostgreSQL, Docker, Linux, and AWS.
- Android/mobile validation, ADB, UI Automator, QA automation, device troubleshooting, and CI/CD-oriented validation workflows.
- Cloud and self-hosted infrastructure using AWS ECS/ECR/EC2/S3, Route 53, CloudFront, Application Load Balancer, Docker, Ubuntu Server, Nginx, DNS, VPN, and operational support.
- Applied AI and automation with LLM workflows, OpenAI/Gemini API concepts, LangChain/LangGraph exposure, RAG concepts, prompt engineering, data processing, and documentation workflows.
- Delivered production B2B systems covering frontend, backend APIs, relational databases, AWS infrastructure, DNS, CDN, load balancing, Docker, Linux, and support.
- Built a low-cost self-hosted homologation environment with Ubuntu Server, Docker, Tailscale VPN, AWS EC2 routing, Route 53 DNS, and Nginx reverse proxy.
- Automated 400+ mobile QA test cases and internal processes, reducing manual validation effort by around 60%.
- Reduced manual client workflows by up to 70% through API integrations, automation, and production business systems.
- Published SBIE 2024 research on a voice and LLM-based virtual assistant for visually impaired students.
| Area | Technologies |
|---|---|
| Backend | Python, FastAPI, Flask, TypeScript, Node.js, Express.js, NestJS exposure, REST APIs, Swagger/OpenAPI |
| Frontend | React, Next.js, TypeScript, JavaScript, Tailwind CSS, HTML, CSS |
| Mobile | Flutter, Dart, Android, Java Android, ADB, Android Studio, UI Automator |
| Cloud/DevOps | AWS ECS/ECR/EC2/S3, Route 53, CloudFront, ALB, Docker, Linux, Ubuntu Server, Nginx, Tailscale VPN, CI/CD |
| Quality | Python QA automation, pytest, Cypress, Playwright, Jest exposure, regression workflows, Gerrit, Jenkins, Azure DevOps |
| Applied AI | LLM integration, prompt engineering, RAG concepts, semantic search, OpenAI/Gemini workflows, LangChain/LangGraph exposure |
| Data | PostgreSQL, MySQL, SQL, SQLAlchemy exposure, Pandas/NumPy academic and project exposure |
Production administrative system for a transportation company. I owned full-stack development, backend APIs, database setup, AWS deployment, DNS, CDN, load balancing, Docker/Linux operations, and support.
- Stack: Flutter Web, backend APIs, PostgreSQL, Docker, AWS ECS/ECR/EC2, CloudFront, Application Load Balancer, Route 53
- Live: https://administracaopedlog.ipenaconsultoria.com.br/
- Source code: confidential due to business/client policy
Low-cost homologation environment created to validate releases without duplicating production AWS costs or exposing a home network directly.
- Stack: Ubuntu Server, Docker, Tailscale VPN, AWS EC2 routing, Route 53 DNS, Nginx reverse proxy, repurposed hardware
- Context: production support, validation, networking, deployment, and operational troubleshooting
B2B website for a software house focused on ERP consulting, TOTVS Protheus contexts, API integrations, custom software, and technical credibility.
- Stack: Next.js, SEO, AWS S3, Route 53, B2B positioning
- Live: https://ipenaconsultoria.com.br/
- Source code: confidential/business-owned
Research project and SBIE 2024 publication focused on supporting visually impaired students with voice interaction and LLM-based workflows.
- Areas: LLMs, accessibility, voice UX, education, applied AI
- Publication: https://sol.sbc.org.br/index.php/sbie/article/view/31461
Public Flutter/Dart project migrating legacy Android workflows into a cross-platform implementation.
- Stack: Flutter, Dart, Android, cross-platform migration
- Repository: https://github.com/nickolaslivero/Flutter-Project---Callidus
- Portfolio: https://nickolaslivero.github.io/
- LinkedIn: https://www.linkedin.com/in/nickolaslivero/
- Email: nickolasjl.work@gmail.com