Senior Software Engineer with more than a decade of experience building software, APIs, automation platforms, cloud solutions, developer tools and data-driven applications.
Throughout my career I've worked across backend development, frontend applications, infrastructure, cloud platforms, databases, automation, artificial intelligence and developer productivity tooling.
I enjoy understanding complex systems, learning new technologies and delivering practical solutions that solve real business problems.
- Design and build scalable backend systems
- Develop APIs and web applications
- Create automation and data processing solutions
- Work with cloud infrastructure and DevOps practices
- Build AI-powered applications and integrations
- Develop internal tools and developer platforms
- Explore new technologies and engineering approaches
- Python
- Rust
- TypeScript
- JavaScript
- Java
- SQL
- Bash
- FastAPI
- Django
- Flask
- Express.js
- Axum
- Pyramid
- Bottle
- REST APIs
- Vue.js
- HTML5
- CSS3
- jQuery
- Bootstrap
- Snowflake
- Snowpark
- PostgreSQL
- MySQL
- Redis
- Neo4j
- DuckDB
- ETL Pipelines
- AWS
- Azure
- Docker
- Kubernetes
- Terraform
- Serverless Architectures
- Linux
- CI/CD
- LLM Applications
- AI Agents
- OpenAI Integrations
- Computer Vision
- Recommendation Systems
- Web Scraping
- Browser Automation
- Workflow Automation
- Pytest
- API Testing
- QA Automation
- Swagger / OpenAPI
Building APIs, services and applications focused on maintainability, performance and scalability.
Designing and deploying solutions using modern cloud-native practices and Infrastructure as Code.
Experimenting with LLMs, AI agents, automation and practical AI applications.
Working with analytical databases, graph databases and data processing pipelines.
Creating tools, automation and workflows that improve productivity and reduce operational complexity.
- Investment portfolio management systems
- Banking APIs
- Brazilian payment and boleto generation libraries
- Expense Detective AI
- Voice Command GPT
- AI-powered assistants and automation projects
- Snowflake applications
- Data engineering experiments
- Neo4j recommendation systems
- Graph data modeling projects
- Terraform environments
- AWS laboratories and experiments
- Infrastructure automation projects
- Web crawlers and scrapers
- Browser automation
- Bots and developer tooling
- Rust backend applications
- Axum-based services
- Performance-oriented experiments
- Backend Engineering
- Full Stack Development
- Cloud Architecture
- Distributed Systems
- Artificial Intelligence
- Data Platforms
- Developer Experience
- Automation
- Open Source
- Performance Optimization
I enjoy working across the entire software development lifecycle—from designing APIs and backend services to cloud infrastructure, frontend applications, automation and data platforms.
Strong engineering fundamentals matter more than any specific framework or technology. My focus is on understanding problems, choosing the right tools and delivering solutions that provide long-term value.
- LinkedIn: https://www.linkedin.com/in/jaymetosineto/
- GitHub: https://github.com/kalkehcoisa
I prefer calm environments, clear ownership and engineering decisions that age well.