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Achievement: QuickdrawAchievement: Pull Sharkx2Achievement: YOLO

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Davi0416/README.md

Davi Asafe

Backend Developer | Java · Spring Boot · PostgreSQL

I build REST APIs and backend systems with business rules, authentication, relational databases, automated testing, messaging and caching.

Currently studying Software Engineering with an emphasis on Artificial Intelligence at Instituto Infnet and looking for backend internship or junior developer opportunities.

Featured projects

Solvo

Payment API with authentication, digital wallets, transfers, external authorization, idempotency and asynchronous notifications.

Stack: Java 25, Spring Boot 4, PostgreSQL, Redis, Kafka, JWT and Testcontainers.

Raw Java API

REST API built without Spring or another web framework to explore HTTP, routing, JSON serialization, persistence and error handling from the ground up.

Stack: Java, JDK HttpServer, Jackson, H2 and Flyway.

Vitalys

Clinic management system with authentication, role-based authorization, patient management and appointment scheduling.

Stack: Java 21, Spring Boot, Spring Security, JWT, MySQL, Docker and React.

Current project

Cobryn

Recurring billing platform being developed as a modular monolith, with a focus on domain modeling, organizations, customers, plans, subscriptions, invoices, payments and webhooks.

Stack: Java 25, Spring Boot 4, PostgreSQL, Flyway and Docker.

Practical experience

I developed a school management system for a real operational need that was adopted by a municipal public school.

This experience involved understanding requirements, designing the solution and delivering software for real users.

Core stack

Java 21/25 · Spring Boot · PostgreSQL · Docker · JUnit · Testcontainers · Flyway · Redis · Kafka

Contact

LinkedIn · Portfolio

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  1. solvo solvo Public

    Payment API with JWT authentication, wallets, transfers, Redis idempotency, Kafka notifications and integration tests.

    Java 1

  2. raw-java-api raw-java-api Public

    REST task API built without a web framework, using JDK HttpServer, Jackson, H2 and Flyway to explore HTTP from the ground up.

    Java

  3. StudyQuest StudyQuest Public

    Gamified desktop learning app with a Java/Quarkus backend, React/Electron frontend, offline-first sync and AI features.

    TypeScript 1

  4. cobryn-billing-platform cobryn-billing-platform Public

    Subscription billing platform in development as a modular monolith with Java 25, Spring Boot 4, PostgreSQL and Flyway.

    Java

  5. vocash vocash Public

    Voice-powered expense assistant built with Spring AI, Whisper, Groq tool calling and PostgreSQL.

    TypeScript