João Rafael Martins

Senior Backend Developer

Xapo Bank

Jan 2021 - Current (5 years 9 months)

● Improved back-end performance through the optimization of database queries and the implementation of caching mechanisms, resulting in faster and more efficient transactions. ● Developed new features and modules for the platform using Python and Flask, resulting in increased efficiency and scalability. ● Implemented new 3rd party integrations (such as Circle and Lightspark) to improve the platform’s functionality and user experience. ● Managed the maintenance and iteration of REST APIs, as well as the infrastructure using Terraform and AWS/Azure, ensuring high availability and security. Show less

Software Engineer

Collective

Jan 2020 - Jan 2021 (1 year 1 month)

● Contributed to the development and maintenance of the company’s web platform using Django and Celery for the back-end, and React for the front-end, resulting in a seamless user experience. ● Development of a tax calculation system for S-Corps companies in the USA, greatly simplifying the tax filing process for clients and achieving high user satisfaction. ● Developed ML applications using GPT-3, and predictive systems for user forecasting and customer support optimization using automated FAQ, improving efficiency and accuracy in these processes. Show less

Full stack Developer / Machine Learning engineer

Xapo Bank

Jan 2018 - Jan 2020 (2 years 1 month)

● Developed and maintained the pipeline of all virtual transaction analysis in real-time, ensuring the detection and prevention of fraudulent activities. ● Led the development of the entire AI pipeline, from ETL to real-time predictive models and model interpretability, resulting in more accurate and reliable predictions.

Software Developer

Olist

Jan 2017 - Jan 2018 (1 year 1 month)

● Developed and maintained private and open-source software, as well as the deployment and monitoring of microservices, ensuring high availability and scalability. ● Developed predictive models for churn detection, document classification, and other data science projects, as well as natural language processing tasks, resulting in improved business insights and decision-making. ● Used technologies such as Heroku, AWS products, Python, Django, React, NPM, jQuery, Redis, PostgreSQL, Docker, Sci-kit learn, TensorFlow, Keras, and PyTorch, to create robust and efficient software solutions. Show less

S

Software Developer

Jan 2015 - Jan 2017 (2 years 1 month)

● Developed web systems using Python and the Django Framework, as well as PHP, resulting in scalable and reliable web platforms. ● Created high-performance and scalable software using NodeJS, Python, and Go, resulting in faster and more efficient processes. ● Maintained and optimized front-end components using technologies such as ES6, React, and jQuery, resulting in a modern and user-friendly interface. ● Used TDD methodology and wrote unit, integration, and acceptance tests, ensuring the quality and reliability of the codebase. ● Maintained CI and CD servers, and created native packages (deb and rpm), streamlining the deployment process. ● Used agile methodologies such as Scrum, to efficiently plan and manage development tasks. ● Develope

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Web Developer

Jan 2014 - Jan 2015 (1 year 1 month)

● Developed a web platform using PHP with a custom framework, and front-end interfaces using Jade and Handlebars, resulting in a user-friendly and intuitive platform. ● Created a REST API and integrated with other platforms, such as Facebook, Mercado Libre, and OLX, greatly expanding the capabilities and functionality of the application. ● Performed database administration and maintenance, ensuring the security and integrity of the data. ● Used technologies such as PHP, MySQL, JavaScript, HTML, jQuery, CSS, and Bootstrap, to create high-quality web applications. Show less

Full-stack Developer

Self Employed

Jan 2009 - Jan 2014 (5 years 1 month)

● Developed and maintained web systems using PHP and the Laravel Framework, as well as front-end interfaces using jQuery and Bootstrap, resulting in functional and user-friendly web applications. ● Created custom CMS solutions and e-commerce platforms, meeting the specific requirements and needs of clients. ● Integrated with payment gateways and APIs from other platforms, expanding the capabilities and functionality of the applications. ● Performed database administration and maintenance, ensuring the integrity and security of the data. Show less

João Rafael Martins

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João Rafael Martins

About

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