João Vitor Verona Biazibetti, Developer in Curitiba - State of Paraná
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João Vitor Verona Biazibetti

Software Developer

Curitiba - State of Paraná

Toptal member since March 8, 2026

Expertise
Slack DevelopmentJavaKotlinSpring BootPostgreSQLJavaScriptDockerReact.jsTypeScriptLinuxWindows DevelopmentGolangCC++MySQL
Bio

João is a software engineer with 7+ years of experience building end-to-end projects across fintech, logistics, and government, scaling systems to five million monthly users. He has expertise in cloud and back-end systems, as well as front-end and mobile development, and has contributed to open-source projects like Google's Gson and Vercel's SWR. Driven by a passion for impactful products, he built Skiley, a hobby project that reached over 400,000 users, and is an Oracle Certified Professional.

Portfolio

Wildlife Studios
Java, Kotlin, Spring Boot, PostgreSQL, Go, Amazon Web Services (AWS), Docker...
PicPay
Java, Kotlin, Amazon EC2, Amazon Web Services (AWS), Linux, Spring Boot...
Iteris CGA
Java, Spring Boot, PostgreSQL, IntelliJ IDEA

Experience

  • Java - 8 years
  • Kotlin - 8 years
  • Spring Boot - 8 years
  • PostgreSQL - 8 years
  • Java 11 - 8 years
  • IntelliJ IDEA - 8 years
  • Docker - 8 years
  • Amazon EC2 - 8 years

Preferred Environment

Slack, Linux, Windows, IntelliJ IDEA, WebStorm, Java, Kotlin, Spring Boot, PostgreSQL

The most amazing...

...solution I've developed is Skiley (skiley.net), with 400,000 registered users, built entirely by me across back end, front end, infrastructure, and mobile apps.

Work Experience

Senior Software Engineer

2023 - PRESENT
Wildlife Studios
  • Owned the development of a new core monetization feature, which directly contributed to a 16% gross revenue increase of the project.
  • Deployed new features weekly, maintaining the game API and infrastructure, retrocompatibility, and integrating with multiple external services such as matchmaking, game instance management, data ingestion pipelines, etc.
  • Managed on-call rotations, monitoring and alerting systems, incident responses, post-mortems, and production issue debugging.
  • Contributed to a modern API service built with Go, using an in-house RPC framework similar to gRPC for communication between microservices.
Technologies: Java, Kotlin, Spring Boot, PostgreSQL, Go, Amazon Web Services (AWS), Docker, Kubernetes, Terraform

Staff Software Engineer

2021 - 2023
PicPay
  • Achieved government certification for open finance readiness on day one, making PicPay the second finance service out of more than 300 to earn this distinction and securing a significant market lead.
  • Designed an event-driven architecture (CQRS-ES) and implemented multiple open finance APIs and business logic that had to adhere to extensive rules from the government.
  • Participated in staff projects and discussions about the business unit's tech efforts and decisions. Led the communication and integration between services maintained by distinct teams.
  • Mentored and directed three mid-level engineers through onboarding, code reviews, feature design, and task delegation.
Technologies: Java, Kotlin, Amazon EC2, Amazon Web Services (AWS), Linux, Spring Boot, PostgreSQL

Senior Software Engineer

2020 - 2021
Iteris CGA
  • Guided the implementation of new finance report generations and data ingestion pipelines from monolithic services.
  • Implemented the back end of critical features, such as government tax calculators and business analytics of consumers.
  • Served as the squad's tech lead in the latter half of the period, mentoring and guiding three mobile engineers.
Technologies: Java, Spring Boot, PostgreSQL, IntelliJ IDEA

Software Engineer

2018 - 2020
Viptech
  • Built a back-end architecture using Kotlin and a Java virtual machine (JVM) with a type-safe ORM, migrating from an old Java Servlet service, achieving around 20% infrastructure cost savings, and increasing test coverage to around 90% from 60%.
  • Created an npm package to integrate with Google Maps using React.
  • Collaborated with a small team to rework a vehicle tracking system, migrating from JavaServer Faces (JSF) to React with RESTful APIs.
Technologies: Java, Kotlin, React, Spring Boot, MySQL

Experience

Skiley

http://skiley.net
Skiley is a hobby project that I have been working on since 2018. It's a platform—a website and an application—that helps Spotify users have an improved experience. Skiley has 400,000 registered users and an average of 35,000 unique users monthly. I built it from the ground up, including the back end, front end, infrastructure, and mobile apps.

Education

2014 - 2019

Bachelor's Degree in Computer Science

Federal University of Technology of Paraná (UTFPR) - Campo Mourão, Paraná, Brazil

Certifications

APRIL 2021 - PRESENT

Oracle Certified Professional: Java SE 11 Developer

Oracle

Skills

Libraries/APIs

React, Node.js

Tools

Slack, IntelliJ IDEA, WebStorm, Terraform, Mocha, Cucumber

Languages

Java, Kotlin, JavaScript, TypeScript, Java SE (Core Java), Java 11, C, C++, Go, C#

Frameworks

Spring Boot, Unity, JUnit

Platforms

Docker, Amazon EC2, Linux, Windows, Amazon Web Services (AWS), Kubernetes, AWS IoT, Apache Kafka, Firebase, JBoss

Storage

PostgreSQL, MySQL, Redis, Amazon DynamoDB

Other

Testcontainers

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