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Daniel – Ruby on Rails, PostgreSQL, Java, experts in Lemon.io

Daniel

From Brazil (GMT-3)

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Back-end Web DeveloperSenior
Hire developer
23 years of commercial experience
Banking
Consulting services
E-commerce
Fintech
Legal tech
Retail
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Daniel – Ruby on Rails, PostgreSQL, Java

Meet Daniel, a back-end developer with over 20 years of expertise, including extensive tech-leading and consulting experience. He is proficient in Java, covering core Java, classes, abstractions, string pools, and Java heap memory management. Daniel excels in database management, including ACID properties, transactions, and locks. He is also skilled in the Spring framework, handling bean scopes and application contexts efficiently. Additionally, Daniel has valuable experience with Ruby, Ruby on Rails, cloud technologies, and NoSQL databases. With Daniel on your team, you gain an exceptional developer with a wealth of skills and leadership qualities.

Main technologies
Ruby on Rails
15.5 years
PostgreSQL
8.5 years
Java
20 years
Spring
16 years
Additional skills
Apache Solr
MySQL
ElasticSearch
Typescript
Angular
Scala
React
Oracle
Ready to start
June 24
Direct hire
Potentially possible

Experience Highlights

Principal Technical Consultant
Jul 2014 - Ongoing9 years 10 months
Project Overview

Daniel worked as a technical consultant responsible for assisting customers. His role involved providing training, offering architecture guidance, and developing custom extensions on behalf of customers. More recently, he joined a team responsible for creating cloud product innovations aimed at addressing the functional gaps in certain products for specific industries and regions.

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Responsibilities:
  • Supported a dozen customers to overcome huge surge events (such as Black Fridays) with zero instability and downtime;
  • Implemented several product features, including performance improvements in data import processes and promotion evaluation;
  • Successfully supported several customers' migration from on-prem to the cloud.
Project Tech stack:
Java
Spring
React
Angular
Tech lead/Senior Back-end developer
Nov 2019 - Jun 20233 years 6 months
Project Overview

A product designed to assist law firms in handling litigation cases more effectively.

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Responsibilities:
  • Successfully upgraded Ruby on Rails from 4.2 to 6.1;
  • Made performance improvements;
  • Implemented several valuable product features, including integration with 3rd-party DAM providers, simplifying the document processing pipeline, and document searching.
Project Tech stack:
Ruby on Rails
React
Tech lead
Jan 2013 - Jun 20141 year 4 months
Project Overview

Shipment Tracking is a module designed to support Brazil's e-commerce operations and provide its customers with an easy-to-use and accurate method for tracking the delivery of their orders.

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Responsibilities:
  • Did the integration with 40+ logistic operators in Brazil;
  • Effectively led a team of 18 software developers, testers, scrum masters, and Product Owners on a large-scale logistics/e-commerce project;
  • Managed the successful development of a new (agile philosophy-based) delivery tracking and carrier relationship system on schedule and budget, increasing revenue by 60% that year;
  • Conducted code reviews and performance tests. Uncovered and fixed errors or inefficiencies by improving architecture to optimize performance.
Project Tech stack:
Ruby on Rails
Oracle
Scala
Tech lead/Architect
Dec 2011 - Jan 20131 year 1 month
Project Overview

An electronic payment processing company that operates within the Brazilian e-commerce ecosystem.

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Responsibilities:
  • Implemented a subscription-based payment model, which supported several new business use cases;
  • Designed and implemented customer ledger, so customers could have a better user experience managing their payments and incoming revenue;
  • Made performance improvements to support customers during Black Friday.
Project Tech stack:
Java
Ruby on Rails
Scala

Education

2004
Computer Sciences
Bsc

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