Celso is available for hire

Celso Wo

Verified Expert in Engineering

Software Developer

Location

Sorocaba - State of São Paulo, Brazil

Toptal Member Since

March 18, 2020

Celso has worked in the retail, financial, health, and gaming industries. He is passionate about building products that have a positive impact on people's lives and enjoys teaching new programmers. His work has reduced production times at companies and helped doctors and parents improve children's ability to listen and focus. His experience encompasses DevOps, infrastructure, applications, and deployment.

Full-stack Front-end Java JavaScript SQL MySQL PostgreSQL iOS Android REST APIs Mobile Development Ruby Ionic Ruby on Rails (RoR)CSS

Portfolio

Cora

Kubernetes, Docker, React, JavaScript, Go, Kotlin, Microservices...

Freelancer

React, React Native, JavaScript, APIs, REST, Expo, Mobile Development, Android...

Cheroke Security

Helm, Jenkins, Java, IBM Cloud, Kubernetes, Docker, Python, Microservices...

Experience

JavaScript - 10 years PostgreSQL - 10 years MySQL - 10 years Ionic - 7 years Ruby on Rails (RoR) - 7 years React Native - 6 years React - 5 years Kotlin - 4 years

Availability

Part-time

Preferred Environment

Kubernetes, Docker, Ruby, JavaScript, Java, Kotlin

The most amazing...

...application I've built improved sales reporting times from ten minutes to ten seconds, by changing the way the data was stored and retrieved.

Work Experience

Software Engineer

2019 - PRESENT

Cora

Developed a Kotlin, Go, and JavaScript-based API for financial services such as money transfers and digital account management.
Developed a Google Chrome extension to extract profile data from LinkedIn. Filled in a database for future searches.
Assisted with the product conception with suggestions. Spoke with clients to understand their needs.

Technologies: Kubernetes, Docker, React, JavaScript, Go, Kotlin, Microservices, Ruby on Rails (RoR), AWS Lambda, REST APIs, Test-driven Development (TDD), Unit Testing, Lambda Functions, Figma

React Native Developer

2018 - PRESENT

Freelancer

Developed a multiplatform app for a Brazilian real state startup that brokers used to sell apartments. The app was built using React Native with Expo and GraphQL.
Developed a multiplatform app for a Brazilian construction company to residential lands. The app was built using React Native with Expo and Access REST API.
Built a multiplatform music app for a Persian company, similar to Tidal. The app was built using React Native with bare workflow and Access REST API.
Created a multiplatform institutional app for a Brazilian clinical laboratory. The app was built using React Native with bare workflow.

Technologies: React, React Native, JavaScript, APIs, REST, Expo, Mobile Development, Android, iOS, Figma

DevOps Engineer

2018 - 2019

Cheroke Security

Developed a pipeline in Jenkins for the software engineer teams that built and deployed applications using IBM Cloud and Kubernetes clusters.
Created and maintained custom Helm charts for internal applications.
Monitored and configured infrastructure applications like Redis, RabbitMQ, and SonarQube.

Technologies: Helm, Jenkins, Java, IBM Cloud, Kubernetes, Docker, Python, Microservices, Ruby on Rails (RoR), Amazon Web Services (AWS), AWS Lambda, REST APIs, Terraform, Lambda Functions

Software Engineer

2017 - 2018

HubFintech

Developed Java, Ruby on Rails (RoR), and .NET core microservices for financial services.
Built a pipeline in Jenkins from code to application deployment.
Participated in product roadmap conception. Helped the teams accomplish their goals.

Technologies: C#, Ruby, Docker, Java, Microservices, REST APIs

Technical Lead

2015 - 2017

GO Varejo

Developed an application in Java for store stock monitoring.
Built a mobile application in JavaScript and C# to collect store stock information.
Integrated with client's enterprise resource planning (ERP) system to complete product setup and make a usage follow-up.
Managed a small team of three developers, a quality assurance (QA) analyst, and a business analyst.

Technologies: C#, NativeScript, JavaScript, Java, REST APIs, Mobile Development, Android, iOS, Minimum Viable Product (MVP)

Experience

Goffitunes

https://play.google.com/store/apps/details?id=br.com.profono.goffitunes

Created a desktop and mobile application that plays songs in different frequencies to help children to improve their listening ability. This application is used by doctors and their patients. I built the app with Corona SDK using Lua. It was published for Android, iOS, Windows, and macOS.

Lyra Music

https://play.google.com/store/apps/details?id=com.lyramusic.app

Developed a music app for the Persian market available on web and mobile platforms (iOS and Android). The web version I built uses Ionic with React.
The mobile app was built with React Native using TypeScript, Redux, and Saga.

Portal do Corretor

https://play.google.com/store/apps/details?id=br.com.guerini.portaldocorretor

Created a real estate app for a Brazilian construction company to help their brokers to sell more. The back end was built using Node.js, Express.js, and PostgreSQL. I built the mobie app using React Native.

Skills

Languages

CSS, Java, JavaScript, Ruby, PHP, SQL, Python, Kotlin, Visual Basic .NET (VB.NET), Visual Basic, Go, TypeScript, C#, C, Lua, HTML

Frameworks

Ionic, React Native, Ruby on Rails (RoR), Corona SDK, NativeScript, .NET, Laravel, Express.js, Angular, Next.js

Libraries/APIs

React, REST APIs, Puppeteer, Vue, Node.js

Paradigms

Microservices, Mobile Development, Test-driven Development (TDD), Unit Testing, Continuous Delivery (CD), Continuous Integration (CI), REST

Platforms

Docker, iOS, Android, Firebase, DigitalOcean, Amazon Web Services (AWS), AWS Lambda, Kubernetes

Storage

MySQL, PostgreSQL, Amazon DynamoDB

Other

Full-stack, Front-end, Minimum Viable Product (MVP), Lambda Functions, IBM Cloud, APIs, Software Engineering

Tools

Figma, Jenkins, Helm, Expo, Terraform

Education

2009 - 2015

Bachelor’s Degree in Systems Development and Analysis

Faculdade de Tecnologia de Sorocaba - Sao Paulo, Brazil

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