JÔNATAS LUIZ DE OLIVEIRA
Python & Rust Backend Developer

CONTACT
Email: contact@jonatasoliveira.dev
Phone: +49 1515 6919449
Location: Lörrach, Germany (Basel Region)
LinkedIn: https://www.linkedin.com/in/jonatasoliveirame/
GitHub: https://github.com/jonatasoli
Forgejo: https://forgejo.singularjourney.org/devjonatas
Blog: https://blog.jonatasoliveira.dev/
YouTube: https://www.youtube.com/@devjonatas

PROFESSIONAL SUMMARY
Senior backend developer with 7+ years of professional experience and a strong track record across 4+ companies, focused on high-performance APIs, distributed system architecture, and cloud infrastructure. Deep expertise in Python and Rust for building scalable APIs, event-driven systems, and async pipelines. Proven leadership as Tech Lead, delivering robust CI/CD pipelines and cloud-native solutions on Kubernetes, GCP, and AWS. Proactive, organized, and creative — with strong adaptability and a passion for solving complex engineering challenges.

CORE SKILLS

Programming Languages:
- Python (expert)
- Rust (advanced)

Backend / APIs:
- FastAPI
- Flask
- Django / Django REST Framework
- Axum (Rust)
- Actix-web (Rust)

Architecture & Distributed Systems:
- Event-driven and aspect-oriented architecture
- Message queues and brokers
- Asynchronous systems
- High-performance APIs
- Microservices and service integration

Async Systems / Queues:
- Celery
- FastStream
- AMQP / amqp-client-rust
- Rust Task Queue
- Apache Kafka

DevOps / Cloud:
- Kubernetes / Docker Swarm / Docker
- CI/CD Pipelines (CircleCI, GitHub Actions)
- Google Cloud Platform (GCP)
- Amazon Web Services (AWS)
- Dokku / Heroku
- Grafana Observability Stack

Frontend:
- Svelte / SvelteKit
- Vue.js / Nuxt.js

Game Development:
- Bevy (Rust)
- Macroquad (Rust)

WORK EXPERIENCE

Singular Journey — Freelance Software Engineer & Architect
Lörrach, Germany | September 2023 – Present

- Designed and built high-performance REST APIs in Rust using Axum and Actix-web
- Developed scalable backend APIs in Python (FastAPI, Flask, Django REST Framework)
- Architected distributed systems with event-driven, async pipeline patterns
- Implemented message queue infrastructure using Celery, FastStream, and AMQP
- Structured cloud-native infrastructure with Kubernetes and Docker Swarm on AWS/GCP
- Established CI/CD pipelines and DevOps workflows for client projects
- Built modern full-stack web applications with Vue.js, Nuxt.js, and Svelte
- Consulted with companies to improve API design and cross-system integrations

Technologies: Python, Rust, FastAPI, Flask, Django REST Framework, Axum, Actix-web, Celery, FastStream, AMQP, Kubernetes, Docker Swarm, AWS, GCP, Grafana, Vue.js, Nuxt.js, Svelte


Mendelics — MeuDNA — Software Engineer (Python Specialist)
São Paulo, Brazil | April 2021 – October 2023

- Led technical team at a pioneering Brazilian genetic analysis laboratory
- Built and maintained scalable Python/FastAPI backend APIs for genomic data processing
- Designed and implemented payment processing and billing API integrations
- Championed automated testing culture with comprehensive Pytest test suites
- Owned and evolved CI/CD infrastructure using CircleCI
- Drove architecture decisions to improve API reliability and performance

Technologies: Python, FastAPI, Pytest, CircleCI, REST APIs, PostgreSQL


Simbiose — Tech Lead
São Paulo, Brazil | November 2021 – April 2022

- Led development team for a startup serving education, gaming, and healthcare sectors
- Defined technical architecture and translated business requirements into engineering solutions
- Coordinated agile Scrum ceremonies and sprint planning
- Developed modern REST APIs with FastAPI, Django, and IOHttp
- Onboarded and mentored junior developers
- Negotiated technical solutions directly with clients and stakeholders

Technologies: Python, FastAPI, Django, IOHttp, TypeScript, Vue.js


Partyou — Software Engineer (Python Specialist)
São Paulo, Brazil | March 2018 – November 2021

- Built REST APIs and web applications for a fintech startup managing university events and payments
- Implemented async task systems using Celery and Kafka for high-throughput processing
- Automated Kubernetes infrastructure management using Rust CLI tools (TUI.rs)
- Designed DevOps and CI/CD pipelines on GCP and AWS
- Developed Nginx plugin using Lua for custom request routing
- Built modern SPA front-ends with Vue.js and Nuxt.js

Technologies: Python, Flask, FastAPI, Celery, Kafka, Kubernetes, AWS, GCP, Vue.js, Nuxt.js, Rust, TUI.rs, Lua, Nginx

OPEN SOURCE PROJECTS

Keyrunes — https://github.com/Keyrunes/keyrunes
Authentication and authorization tool built in Rust, with SDKs for Python and Rust.
- Modern auth system supporting multiple application integrations
- Clean SDK for easy adoption in Python and Rust projects

Capicart — https://forgejo.singularjourney.org/Capivara-Industries
E-commerce platform focused on the Brazilian market with integrated local vendor system.
- Built with FastAPI (backend) and Svelte (frontend)
- Modern event-driven web application architecture

TECHNICAL CONTENT

YouTube Channel: https://www.youtube.com/@devjonatas
- Technical content in Portuguese: programming, Rust, Linux, dev tools, editors, productivity

Technical Blog: https://blog.jonatasoliveira.dev/
- Articles on backend development, Linux, Rust, and Python best practices

EDUCATION

Bachelor of Science, Computer Engineering
Faculdade de Engenharia de Sorocaba (FACENS)
Sorocaba, Brazil

LANGUAGES
- Portuguese: Native
- English: Upper-Intermediate (B2)
- German: Intermediate (B1)