Jonas is a Fullstack Developer combining technical experience, analytical abilities and good coding skills to produce scalable software solutions for clients - handling the dev lifecycle from conception to deployment. He is familiar with frontend and backend coding languages, development frameworks and 3rd-party libraries - ensuring compliance with non-functionals on scalability, resilience, configurability, upgradeability and responsiveness.
Designed, implemented and maintained solutions on the Gerência pesticide management and agric-traceability Android app.
Developed an event-driven GraphQL API with Rust, where all events are logged for later audit. Processed events (write side) into performant view data (read side) through CQRS pattern.
Integrated Keycloak’s user management, JWT and social login. Built React admin panel and Android app, which integrates Google Maps to delimit farm’s land.
Migrated legacy PHP backend to Kotlin (Spring/JVM) for greater maintainability and test coverage. Migrated inefficient PHP background tasks (pushes, delivery matching algorithm and third-party integrations) to Celery (Python async task queue) to scale throughput without increasing costs.
Designed and led the development of a public delivery API (Spring, Kong) to connect partner stores to professionals, as well as provided support directly to partners’ engineers.
Built a RabbitMQ event bus to stream data to API webhook, notification and websocket services. Cached user session and frequently used data with Redis to reduce latency and database usage. Worked with SQL modeling, Docker and servers (Haproxy, Nginx) and mentored new members.
Met with stakeholders and did requirement analysis for a Wind Turbine inspection app. Built and implemented a hybrid wind turbine inspection application for Delfos IM.
Developed a hybrid app with Ionic 2 (Node.js), backend with Flask (Python) and PostgreSQL and web dashboard with Angular 2 (Node.js). Deployed on AWS with ECS, S3, Docker and Nginx.
Identified, troubleshot and resolved complex issues on the new inspection application.
Designed a platform to match clients to personal trainers and for sport and fitness group classes.
Built a hybrid app with Ionic 2, backend and website with Django (Python) and MySQL. Integrated a payment system. Deployed on app stores and on AWS with Apache.
Developed the backend website application, built the frontend architecture and handled AWS deployment.
Led processes to design and develop a new Public Delivery API that connects partner stores to professionals - providing support directly to partner engineers. Delivered an event-driven system written in Kotlin to send notifications and webhooks through a RabbitMQ event bus and Python-based distributed asynchronous task queue.
Designed the Pesticide Management and Agriculture Traceability platform with an event-driven GraphQL API and Rust to log events for audits and integrated Keycloak for user management, JWT and social login. Built and implemented the React admin panel and Android app.
Worked on the Delfos hybrid wind turbine inspection application. Met stakeholders, handled requirement analysis, built the hybrid app, implemented backend solutions and web dashboard, and deployment to AWS.
