Desenvolvedor Full Stack | Java | Spring Boot | Streamlit
Freelancer
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Leonardo Simões Email & Phone Number
Desenvolvedor Full Stack | Java | Spring Boot | Streamlit
at
Freelancer
LinkedIn matched
✓ Verified July 2026
3 data sources
Profile completeness 86%
Current company
Freelancer
Role
Desenvolvedor Full Stack | Java | Spring Boot | Streamlit
Location
Rio De Janeiro, Brazil
Who is Leonardo Simões? Overview
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Quick answer
Leonardo Simões is listed as Desenvolvedor Full Stack | Java | Spring Boot | Streamlit at Freelancer, based in Rio De Janeiro, Brazil. AeroLeads shows a matched LinkedIn profile for Leonardo Simões.
Leonardo Simões previously worked as Full Stack Developer | Java | Spring Boot | Python | Streamlit at Freelancer and Back-End Developer | Java | Spring Boot at Quantum. Leonardo Simões holds Bachelor Of Science - Bs, Computer Engineering from Universidade Do Estado Do Rio De Janeiro.
Profile bio
About Leonardo Simões
I am a Software Developer with over 3 years of professional experience, specializing in back-end development with Java and Spring. I have also worked as a full-stack developer and on data projects.Currently, I work as a freelancer on software development and web page projects, data analysis and engineering, machine learning, and artificial intelligence applications.I began my journey in the field of technology and programming by enrolling in the technical course in Informatics at Cefet/RJ, where I studied HTML, CSS, JavaScript, C, C++, Java, SQL, and UML to design and develop complete systems, from client-side visual parts to server-side logic. Subsequently, I started my bachelor's degree in Computer Engineering, where I deepened my knowledge in mathematics and programming. During this period, I gained my first professional experiences as a developer, working on a scientific initiation project and an internship.In addition to academic courses, I have always sought to improve my knowledge and skills through various online courses, especially through bootcamps and nanodegrees.Skills:• Front-end: HTML, CSS, JavaScript, TypeScript, Bootstrap• Back-end: REST API, MVC, SOAP, GraphQL, ORM, CRUD• Data: SQL, MySQL, PostgreSQL, H2, SQLServer, NoSQL, MongoDB, Redis, Microsoft Power BI• DevOps: Docker, Shell Script, CI/CD, AWS, Git, GitHub• Java: Spring Framework, Spring Boot, Quarkus, Hibernate, JUnit, Mockito, JPA, JDBC• Python: Django, Flask, FastAPI, Streamlit, Pandas, Numpy, Scikit-learn, Matplotlib, Seaborn, Plotly, Jupyter Notebook• JavaScript: Node.js, Express.js, Fastify.js, Vue.js, React.jsCertifications:• AWS Certified Cloud Practitioner (CLF-C02)Portfólio: https://leonardosimoes.streamlit.app/ GitHub: https://github.com/leosimoes
Current workplace
Leonardo Simões's current company
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Freelancer
4 roles
Leonardo Simões work experience
A career timeline built from the work history available for this profile.
Full Stack Developer | Java | Spring Boot | Python | Streamlit
Current
Freelancer
Software and Data Development ProjectsIn software engineering projects, working as a front-end, back-end, or full-stack developer, I utilized Java, JavaScript, TypeScript, and Python. My activities included:• Creating web pages from provided layouts, including landing pages.• Developing REST, RESTful, GraphQL, and SOAP APIs.• Adding new endpoints to APIs.• Fixing bugs.• Implementing new features and tests.Data projects typically involve SQL and Python, as well as tools like Microsoft Power BI and Jupyter Notebook. My activities included:• Generating reports with query results.• Creating graphs and dashboards in Microsoft Power BI.• Developing web pages with Streamlit.• Conducting statistical tests, such as A/B testing.• Analyzing data and building machine learning models in Jupyter Notebook.• Performing ETL and ELT processes.• Creating pipelines and automating processes.• Evaluating machine learning models for regression and classification.
Jan 2022 - Present
Back-End Developer | Java | Spring Boot
Internship as a Java and Spring Boot Developer at a company specialized in developing solutions to access, analyze, compare, monitor, manage, and present financial information in an easy, consistent, and efficient manner.Key activities:• Development of new functionalities for the company's internal and external systems.• Creation and adjustment of screens.• Bug fixing.• Refactoring of legacy code.• Extraction, transformation, and loading of financial data from API consumption and web scraping.• Creation and modification of database tables.Utilization of:• Agile methodology (Scrum).• Test-driven development (TDD).• Systems analysis, software design, coding, software testing, data modeling, and database table creation.
Jul 2019 - Dec 2019
Back-End Developer | Java
Pibic/Uerj
Scientific Initiation Project: Advanced Multiplatform Multimedia Programming Techniques for VideogamesThe project involved developing a personality simulator with gamification elements, using Java and the PlayN engine. By building the project with Maven, the program was exported to HTML and iOS versions, in addition to the Java version, making it a multiplatform project that was easy to refactor. All technologies used in the project were open-source software.
Feb 2014 - Jan 2016
3 education records
Leonardo Simões education
Bachelor Of Science - Bs, Computer Engineering
Nanodegree Programs, Computer Science
Técnico Em Informática, Ciências Da Computação E Informática
FAQ
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Quick answers generated from the profile data available on this page.
What company does Leonardo Simões work for?
Leonardo Simões works for Freelancer.
What is Leonardo Simões's role at Freelancer?
Leonardo Simões is listed as Desenvolvedor Full Stack | Java | Spring Boot | Streamlit at Freelancer.
Where is Leonardo Simões based?
Leonardo Simões is based in Rio De Janeiro, Brazil while working with Freelancer.
What companies has Leonardo Simões worked for?
Leonardo Simões has worked for Freelancer, Quantum, and Pibic/Uerj.
How can I contact Leonardo Simões?
You can use AeroLeads to view verified contact signals for Leonardo Simões at Freelancer, including work email, phone, and LinkedIn data when available.
What schools did Leonardo Simões attend?
Leonardo Simões holds Bachelor Of Science - Bs, Computer Engineering from Universidade Do Estado Do Rio De Janeiro.
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