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João Oliveira

@jvoliveira01

Software Engineer | Node.js, Typescript, NestJS, Python, Deep Learning | AI Researcher | Solutions Engineer | Tech Customer Ops

Brazil

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Software Engineer and AI Researcher with 6+ years of experience in backend development, REST APIs, open-source SDKs and plugins/modules, and currently pursuing an MSc in Computer Science (deep learning for medical imaging) at Universidade Federal de Viçosa.

Currently a Solutions Engineer at Efí Bank, defining internal processes, building operational playbooks and managing relationships with key accounts. Experienced in process mapping and in Scrum and Kanban delivery.

Author of a survey on deep learning for volumetric medical imaging (SIBGRAPI 2025). Proficient in English for communication and technical documentation, with experience presenting training and project content on video.

Experience

Work history, roles, and key accomplishments

Current

Solutions Engineer

Current

Efí Bank

Mar 2026 - Present (6 months)

Led architecture and technical operations workflows for the tech customer success team, scaling from 0 to 60+ monitored clients. Developed operational playbooks and managed relationships with 20+ strategic accounts, achieving 4.91/5 CSAT and 100% retention rate.

Process Mapping Playbooks Technical Documentation Customer Success KPI Tracking Salesforce NodeJS Express Git

Software Engineer II

Efí Bank

Jan 2024 - Mar 2026 (2 years 2 months)

Improved a Discord bot integrating with Salesforce Messaging API using Node.js, Express, and Git. Provided technical consulting in sales meetings and managed the team's shift schedule for 10 employees.

NodeJS Express Git Salesforce Messaging API Discord Technical Consulting Team Management

Software Engineer I

Efí Bank

Apr 2022 - Jan 2024 (1 year 9 months)

Developed the official Efí Bank WordPress/WooCommerce plugin for payment issuance via Boleto, credit card, Open Finance, and Pix. Built integration tests with Jest and Git, achieving 100% API endpoint coverage, and developed a web app for Pix certificate conversion.

PHP JavaScript Git WordPress WooCommerce Jest Integration Testing HTML CSS Pix Open Finance Boletos Credit Cards

Software Development Technician

Efí Bank

Jan 2021 - Apr 2022 (1 year 3 months)

Developed the open-source Node.js SDK for Efí Bank's Pix, Boleto, and Open Finance APIs, with 26 GitHub stars and ~2,100 weekly npm downloads. Provided technical customer support via tickets, Discord, and phone calls.

NodeJS SDK Development Open Source Pix Boletos Open Finance Customer Support

Backend Developer

Camaleão Softwares

Jan 2020 - Jan 2021 (1 year)

Built the Agileasy API, a NestJS/TypeScript backend for a mobile app connecting customers with service providers, with OAuth2 authentication, MongoDB, unit tests with Jest, and GitLab.

NestJS TypeScript OAuth MongoDB Jest Gitlab REST APIs

IT Assistant

Unimed Norte Fluminense

Sep 2020 - Dec 2020 (3 months)

Built Comunicados Diarios, an internal Node.js/Express system with an Electron client to broadcast daily notices across the corporate network. Created process flowcharts and internal documents to improve operations.

NodeJS Express Electron Process Mapping Documentation

IT Infrastructure Assistant

Unimed Norte Fluminense

Jan 2020 - Sep 2020 (8 months)

Configured basic networks, ran backup routines, and performed preventive and corrective maintenance on computers.

Network Configuration Backup Maintenance

IT Intern

Unimed Norte Fluminense

Oct 2018 - Dec 2019 (1 year 2 months)

Handled support tickets and provided support for the clinical system used by the health plan operator, serving 250+ users.

IT Support Ticketing Systems Clinical Systems

Web Developer

Couve Limão Agency

Sep 2017 - Jun 2018 (9 months)

Built blogs, corporate websites, and lead-capture and sales landing pages.

Web Development HTML CSS JavaScript Landing Pages

Education

Degrees, certifications, and relevant coursework

Universidade Federal de Viçosa

Master of Science, Computer Science

2024 -

Activities and societies: Research in AI applied to medical image segmentation; wrote and reviewed scientific papers.

MSc in Computer Science with research in AI applied to medical image segmentation, focusing on deep learning, self-supervised learning, and meta-learning. Expected completion in August 2027.