WebLive
Orbit Dashboard
Analytics concept built from metric definitions first: every panel shows its formula, its comparison and how fresh the data is.
- TypeScript
- React
- Next.js
- PostgreSQL
- 1 more technology
Senior Full Stack Software Engineer
Júlio L. Müller
Complex problems. Thoughtful engineering. Software that matters.
01About
Who I am and how I work
I'm a software engineer driven by curiosity and a problem-solver by nature. I enjoy understanding how things work, questioning assumptions, and finding better ways to solve problems. My journey into software started with process automation, which gave me a perspective that goes beyond code: understanding the people, processes, and real-world needs behind every solution.
I value ownership, continuous learning, and thoughtful engineering. I like getting involved, collaborating, and turning ambiguous ideas into useful, reliable products. I'm technology-agnostic by choice, always more interested in solving the right problem than following the latest trend.
Lately, I've been exploring AI-driven and agentic software development, rethinking how we build software without losing sight of what matters: quality, maintainability, and the people who use it.
10+
years building software
40+
projects shipped
99.9%
uptime on flagship projects
02Stack
Technologies I work with
The tools I reach for, grouped by where they fit in a system. A map of breadth, not a scoreboard.
Languages15
- JavaScript
- TypeScript
- HTML5
- CSS3
- SQL
- Go
- Java
- Python
- PHP
- Lua
- Ruby
- C
- Kotlin
- Bash
- VBA
Frontend17
- React
- Vue.js
- Next.js
- Tailwind CSS
- Nuxt
- React Native
- Expo
- Electron
- Vite
- AngularJS
- Sass
- Bootstrap
- Material UI
- Redux
- jQuery
- Zustand
- TanStack Query
Backend & APIs17
- Node.js
- Express
- GraphQL
- Bun
- NestJS
- Fastify
- Prisma
- gRPC
- Swagger
- FeathersJS
- Laravel
- Spring
- Apache
- Socket.io
- Axios
- Composer
- npm
Data & messaging10
- PostgreSQL
- Redis
- MongoDB
- MySQL
- RabbitMQ
- Kafka
- Google Cloud Pub/Sub
- BigQuery
- DynamoDB
- Elasticsearch
Cloud & DevOps16
- AWS
- Google Cloud
- Docker
- Git
- GitHub
- Vercel
- Kubernetes
- GitHub Actions
- Terraform
- Android
- GitLab
- ArgoCD
- CircleCI
- Firebase
- Datadog
- Linux
Integrations & automation15
- Okta
- Stripe
- Sanity
- SAP
- Figma
- Postman
- Jira
- Mapbox
- Cypress
- Jest
- ESLint
- Babel
- Excel / Power Query
- Power BI
- SharePoint
AI agents & tooling6
- Cursor
- VS Code
- Claude
- GPT
- Gemini
- Lovable
Practices and concepts
- REST API design
- Clean Architecture
- SOLID
- Domain-Driven Design
- Microservices
- Microfrontends
- Design systems
- Observability
- CI/CD
- Spec-driven development
- LLMs and AI
- Payment APIs and systems
- Solution architecture
- Tech leadership
- Open source contribution
- Automation
03Work
Selected work
A few projects I am glad to talk about. Each one links to the context, the trade-offs and what came out of it.
MobileIn progressPocket Ledger
Mobile finance concept that records expenses in two taps, syncs when a connection returns and never loses an entry.
- TypeScript
- React
- Node.js
- PostgreSQL
IntegrationLivePay Bridge
Integration concept between a storefront and a payment provider, with idempotent requests, a durable queue and readable reconciliation reports.
- Node.js
- TypeScript
- Stripe
- RabbitMQ
- 1 more technology
04Résumé
Work and education
The short version of where I have worked and studied. Download the PDF or open LinkedIn for the rest.
Senior Full Stack Engineer · Lumen Works
– PresentRemoteI lead the web platform of a fictional scheduling product, from the database schema to the design system.
- Cut the median page load from 3.1 s to 1.2 s by moving reports to server rendering.
- Designed the public API now used by 30 partner integrations.
- Mentored four engineers through their first on-call rotation.
Technologies
- TypeScript
- React
- Next.js
- Node.js
- PostgreSQL
- AWS
- Docker
Lead Frontend Engineer · Northbridge Labs
– Curitiba, Brazil (hybrid)I led a team of five building the customer portal of a fictional logistics company.
- Shipped a shared component library adopted by three product teams.
- Raised automated test coverage of the portal from 35% to 82%.
Technologies
- TypeScript
- Vue.js
- Nuxt
- GraphQL
- Google Cloud
Software Engineer · Fable & Co.
– Curitiba, BrazilI built internal tools and integrations for the back office of a fictional retail group.
- Automated a monthly reconciliation that used to take two people a full week.
- Migrated 12 legacy reports from spreadsheets to a single SQL data mart.
Technologies
- JavaScript
- PHP
- SQL
- AngularJS
- VBA
05Contact
Let’s build something that lasts
Have a hard problem, a product idea or a role in mind? Let’s talk.
06Recommended
Worth following
People whose work taught me something. Go read, watch or follow them.
Ada Sample
Staff Engineer
Writes the clearest explanations of distributed systems I know. Her posts on retries changed how I design queues.
Visit profile
Marco Placeholder
Product Designer
Turns vague briefs into flows that engineers can build in a week. Follow him for practical critiques of real interfaces.
Visit profile
Lin Example
Developer Advocate
Short, honest videos about web performance. Every one of them ends with something you can try that afternoon.
Visit profile