Luciano Greiner dos Santos, Full-stack Developer in Porto Alegre - State of Rio Grande do Sul, Brazil
Luciano Greiner dos Santos

Full-stack Developer in Porto Alegre - State of Rio Grande do Sul, Brazil

Member since June 9, 2016
Luciano is a seasoned professional with a decade and a half of experience developing Java enterprise applications. Currently, he's focused on big-data technologies such as Spark, Cassandra, Kafka, and Elasticsearch. He's capable of working as a full-stack engineer, having also worked with JavaScript and AngularJS in the past. Luciano is also fluent in English, has a native level in Portuguese, and has basic Spanish speaking abilities.
Luciano is now available for hire

Portfolio

Experience

Location

Porto Alegre - State of Rio Grande do Sul, Brazil

Availability

Full-time

Preferred Environment

VS Code, Git, IDEA IDE

The most amazing...

...thing I've done was extract 100,000 of the most popular people and what their professions are from one year of raw Twitter data.

Employment

  • Lead Blockchain engineer

    2022 - PRESENT
    Alchemy - w3aas
    • Lead engineer and manager of NFT projects for remarkable clients of Entertainment, Hospitality and Restaurant industries.
    • Architecture and development of an automated platform to customize and deploy standardized smart contracts.
    • Development of several Web3 components to interact with smart contracts and backend services.
    • Development of advanced blockchain monitoring and analytics tools to keep on-chain data in sync with high-performance cache stores.
    Technologies: Web3.js, Ethers.js, Ethereum, Solidity, Rust, TypeScript, AWS, IPFS, GraphQL, Full-stack, React
  • Blockchain Consultant

    2022 - 2022
    Creator Networks Inc.
    • Training/Lectures about NFT development standards and good practices.
    • Training/Lectures about Blockchain Subgraph development.
    • Advisory of a project to empower Youtube Content creators to sell and share revenue from their channels though NFTs.
    Technologies: Non-fungible Tokens (NFT), Solidity, Full-stack
  • Lead Web3 and Blockchain engineer

    2022 - 2022
    OffStage Holdings
    • Development of Ethereum smart contract in Solidity using ERC721 standard for a NFT collection.
    • Development of a Web3 frontend to mint and collect payments for NFTs, show user assets and process utility orders.
    • Deployment of a scalable and secure Web3 infrastructure using Openzeppelin Defender and AWS.
    Technologies: Web3.js, Solidity, Blockchain, GraphQL, Figma, React
  • Director of Engineering - Blockchain

    2020 - 2022
    Omni
    • Planned and put together an engineering team for a disrupting Blockchain-based social media platform that will reward regular users with crypto and mint NFTs for every post created to give back true content ownership.
    • Defined and implemented software architecture and blockchain technologies.
    • Managed the development of a new smart contract for a social media token.
    • Participated in developing Web3 components to let users sign in to our DApp. This enabled them to check their token allocations, use other functions like username reservation, and participate in special promotions.
    • Collaborated on developing an NFT collection and a smart raffle contract using Chainlink technology, which we made accessible through Web3.
    • Managed a globally distributed team of over 25 engineers and was in charge of requirements specification. I was in constant communication with the executive board to translate high-level business requirements into software deliverables.
    Technologies: Java, Blockchain, Management, Web3.js, Cassandra, Apache Kafka, Spring, Non-fungible Tokens (NFT), Solidity, GraphQL, Full-stack, Figma, React
  • Python Engineer

    2021 - 2021
    Yara
    • Developed new data visualizations for field irrigation information.
    • Pioneered new reports for nitrogen application recommendations.
    • Helped fix a dozen bug fixes and worked on improvements on partner integrations, such as John Deere.
    Technologies: Python, JavaScript, Full-stack
  • Lead Java Engineer

    2020 - 2021
    Caterpillar
    • Developed an engine for applying processing rules to telemetry data collected from tractors and other appliances.
    • Implemented over 30 different rules to detect failures on tractors.
    • Implemented an analytics engine that retrieves historical telemetry data to detect abnormal tractor behaviors, like undesired location changes or awkward odometer movements.
    Technologies: Java, Spring, AWS, AWS DynamoDB, Full-stack
  • Senior ES Consultant

    2019 - 2020
    MediaMinds, LLC
    • Worked on the performance tuning of the Elasticsearch cluster set up.
    • Refactored the existing Elasticsearch queries and improved the overall response time from over 30s to a mere sub-second.
    • Developed a new SMS campaign statistics dashboard using advanced Elasticsearch and Kibana query capabilities.
    Technologies: Elasticsearch, Angular, PHP, Full-stack, Data Analytics
  • Lead Full-stack Engineer

    2017 - 2019
    Tatts/Tabcorp
    • Played a leadership role in a global development team.
    • Implemented several new features to a charitable raffle system.
    • Completely refactored the front end and made the app more attractive to clients.
    • Implemented an autoplay function which enhanced sales by 10%.
    • Provided support to sporting clubs for the raffle system.
    Technologies: Sass, Angular, Java, Groovy, AWS Lambda, AWS CloudFormation, Full-stack
  • Full-stack Engineer

    2017 - 2019
    ZeeMaps
    • Developed new features and maintained a SaaS enterprise map application.
    • Created a new admin dashboard to manage billing and customer support.
    • Implemented a new custom route functionality on the map system.
    • Integrated a unit testing framework to improve general delivery quality.
    Technologies: GIS, PostgreSQL, jQuery, JavaScript, JSP, Java, Full-stack
  • Full-stack Engineer

    2016 - 2019
    DataStreamer
    • Developed a crawler module to load social video media content from Vimeo.
    • Created enhancements to media crawlers to increase coverage of Twitter, YouTube, and Instagram data feeds.
    • Developed a new customer subscription and payment platform integrated with Stripe.
    • Migrated a legacy servlet-based infrastructure to Jax-RS using Jersey.
    • Created an Elasticsearch REST plugin to add a result counting HTTP header into server responses.
    • Integrated Spark SQL and Elasticsearch to enable custom data research.
    Technologies: Scala, Kibana, ActiveMQ, Cassandra, Elasticsearch, Java, Full-stack, Data Analytics
  • Chief Java Architect

    2016 - 2018
    Aurea Software
    • Designed a common alert streaming infrastructure to use Kafka and Spark to be used across multiple company products.
    • Developed plugins to enable monitoring and troubleshooting of several applications used by important clients.
    • Created a custom report dashboard based on data collected by sensors streams.
    Technologies: Scala, Big Data, REST, JAX-RS, Cassandra, Spark, Apache Kafka, Java, Full-stack
  • Senior JEE Architect

    2015 - 2016
    Powerlogic | RS Department of Justice
    • Designed and developed a standard RESTful service architecture using Java 8, Jax-RS, and CDI being used in several projects.
    • Developed a security system to deliver consolidated application access and user information from Active Directory and HR systems through a REST interface.
    • Mentored and trained development teams on AngularJS.
    • Developed and designed a standard component-based AngularJS reference architecture.
    • Maintained and updated Jenkins and Sonar installations for dozens of department projects.
    • Supported and provided assessments for development teams.
    Technologies: JSON, RESTful Development, RESTful APIs, TypeScript, Gulp, Hazelcast, Spring, JSF, Oracle, WebLogic, Java EE, AngularJS, JavaScript, Java 8, Full-stack
  • Senior Consulting Architect

    2014 - 2015
    TOTVS | Brazil Ministry of Health
    • Developed a real-time module to enable the exchange of harm notifications data between cities, states, and central federal government spheres.
    • Created an installable version of the web application using an embedded JavaFX browser and IzPack so it could be used on standalone offline mode.
    • Supported an application deployment into a huge cluster infrastructure data center of the Ministry of Health.
    • Developed a new disease-harm notification instruments using Java, REST, and AngularJS.
    Technologies: Spring, JSON, RESTful Development, RESTful APIs, JBoss, PostgreSQL, Oracle, AngularJS, Java EE, JavaScript, Java, Full-stack
  • IT Specialist

    2008 - 2015
    IBM
    • Developed a RESTful integration API using Spring REST, JDBC, and DB2 for ILC and ICLA legacy systems, enabling the creation of their mobile version with IBM Worklight Platform.
    • Implemented a batch data exchanger between our labor-claiming software with SAP, using Java NIO API and DB2.
    • Worked as a Java instructor representing IBM for the BTP internship program in a local college institution attended by around 100 students.
    • Developed a spreadsheet import and export function for the Intranet Labor Claiming software using Apache POI and Java.
    • Created an event-based SQL parser to enable batch editing of thousand of existing DB2 statements.
    Technologies: JSON, RESTful Development, RESTful APIs, IBM Worklight, Spring, IBM Db2, WebSphere, Java EE, Java
  • Senior Consulting Architect

    2014 - 2014
    SRM Asset Management
    • Developed and designed a micro-services architecture using standalone Java agents and RabbitMQ for their financial system.
    • Created an integration layer between a SQL Server Message Broker and RabbitMQ to enable real-time processing of operations executed on the legacy system.
    • Developed a payments dispatcher web interface using AngularJS and WebSockets.
    Technologies: JSON, RESTful Development, RESTful APIs, AngularJS, Microsoft SQL Server, GlassFish, Hazelcast, RabbitMQ, Microservices, Spring, Java EE, Java 8
  • Senior Consulting Architect

    2012 - 2014
    TOTVS | Brazil Ministry of Health
    • Designed and developed an AngularJS front-end architecture to enable rule-intensive harm notification forms.
    • Developed a dozen disease notification forms and business rules using Java, Spring, Oracle, and AngularJS.
    • Created alerts and reports for epidemic patterns based on real-time data from collected from harm notifications.
    • Designed a data exchanger to enable online and offline notifications.
    • Developed a harm notification mobile application using jQuery Mobile.
    Technologies: Oracle RDBMS, PostgreSQL, Spring, JSON, RESTful Development, RESTful APIs, JBoss, AngularJS, Java EE, JavaScript, Java
  • Training Instructor

    2006 - 2011
    TargetTrust
    • Taught as an instructor on JSP/ Servlets, Struts, Spring Framework, Enterprise JavaBeans, Hibernate, JavaServer Faces, and JBoss Seam.
    • Worked in more than 25 courses over five years.
    • Responsible for creating course handouts and presentation slides.
    Technologies: Java
  • Senior Java Developer

    2007 - 2008
    e-Core
    • Developed a port change and discharge schedules module using EJB, Hibernate, and Struts.
    • Created a data integration loader for Vessels Lloyds Feed service using Oracle PL/SQL and JDBC.
    Technologies: Hibernate, WebSphere, Oracle, Apache Struts, Enterprise Java Beans (EJB), Java
  • Java Developer

    2005 - 2007
    Telefonica España
    • Developed a document workflow module using Java and PL/SQL.
    • Created an integration layer between the web application and the back-office telecom system.
    Technologies: PL/SQL, Oracle, WebLogic, Spring, Apache Struts, Java

Experience

  • Artemis

    Artemis is a crawler that indexes social media content from multiple web sources into a more than 10 billion records Cassandra database and Elasticsearch index that serves enterprise customers and data analysis feeds.

  • CEJUSC

    CEJUSC is an AngularJS application used by the RS State Justice Department into pre-trial conflict mediation procedures helping to underload the justice system.

  • Security Services

    Security Services is a restful application that serves consolidated user and application authorization data from Active Directory and other HR systems for dozen applications on RS State Justice Department.

  • SINAN

    SINAN is a web application used by hospitals and health units across the country to enable disease case notifications to the govern spheres. The collected information is used to detect public health risks, such as epidemics. The application was successfully proven to track a Dengue epidemic occurred in Brazil in early 2015.

  • ILC - Intranet Labor Claiming

    ILC is the official application used by more than 400,000 IBM employees weekly to claim worked hours through using a standalone and mobile version.

  • New SRM

    New SRM is a financial management system used for credit analysis, CRM, and payment management developed using Microservices, AngularJS, and WebSockets.

  • ICLA - Intranet Contract Labor Approval

    ICLA is a global application used by IBM to enable contract labor approval and payment; developed with Java and DB2.

  • LMS - Logistics Management System

    LMS is a software developed for Bunge Global Agribusiness to manage port and vessel operations such as schedules, loading, and discharge.

  • Credenciadas

    Credenciadas is a web-based system to enable Telefonica Dealers online telecom core business service operations, such as line/phone sales and plan migrations.

  • SCJP - Sun Certified Java Programmer

    I am a Sun Certified Java Programmer.

  • SCWCD - Sun Certified Web Components Developer

    Sun Certified Web Components Developer

  • SCBCD - Sun Certified Business Components Developer

    I am a Sun Certified Business Components Developer.

  • SCEA - Sun Certified Enterprise Architect

    I am a Sun Certified Enterprise Architect (Step 2).

  • Functional Programming Utilities for Java 8
    https://github.com/lucianogreiner/fp4j

    A personal open source library to add extra functional programming utilities into Java 8 code inspired by Scala.

  • Omni - Blockchain Social Media

    Omni is a social media platform that aims to give back the ownership of the content to the hands of the users. The way they accomplished was by minting NFTs for every Post created in the platform that is owned directly by the user.

    The platform would them distribute rewards for the engagement in the platform in the form of tokens directly to the content NFTs. That means posts could also be traded along with their rights to receive royalties.

  • OverHyped Pandas
    https://overhypedpandas.io

    OverHyped pandas is a NFT collection deployed on Ethereum network with great artwork and utility.

    The project was developed from the ground including the smart contract and Web3 frontends portal to let their users to mint and pay, and manage their assets.

Skills

  • Languages

    Java 8, Python, HTML5, HTML, SQL, JavaScript, Java, Solidity, GraphQL, Groovy, Perl, Scala, TypeScript, Sass, Python 3, PHP, CSS, Rust
  • Frameworks

    JSF, Apache Spark, AngularJS, Spring, JPA, Bootstrap, Spring Boot, Hibernate, Spring JDBC, Spring MVC, Next.js, Hadoop, Angular, Angular Material, OAuth 2, Activiti BPM, Apache Struts, Spark, JSP, JavaServer Faces
  • Libraries/APIs

    JDBC, JAX-WS, JAX-RS, Node.js, Moment.js, Spring REST, React, Web3.js, Stripe, Stripe API, jQuery
  • Tools

    Eclipse IDE, Bitbucket, Subversion (SVN), Jetty, Git, Apache Tomcat, RabbitMQ, Maven, IntelliJ IDEA, Bower, Apache Ant, AWS SDK, AWS CloudFormation, Gulp, ActiveMQ, SoapUI, Grunt, AWS Push Notification Service (AWS SNS), Figma, IDEA IDE, VS Code, Kibana, IBM Worklight, GIS, Apache Storm
  • Paradigms

    Service-oriented Architecture (SOA), REST, Lambda Architecture, Microservices, RESTful Development, Management
  • Platforms

    AWS Elastic Beanstalk, Docker, Amazon EC2, Amazon Web Services (AWS), Oracle, Linux, Blockchain, Ethereum, Kubernetes, Apache Kafka, JBoss, WebSphere, AWS Lambda, Eclipse, Java EE
  • Storage

    JSON, Elasticsearch, Cassandra, PostgreSQL, H2, Spring Data, Amazon S3 (AWS S3), Hazelcast, IBM Db2, Neo4j, MySQL, MongoDB, Microsoft SQL Server, Oracle RDBMS, PL/SQL, AWS DynamoDB
  • Other

    Enterprise, JAAS, WebLogic, SOAP, EclipseLink, EJB 3, CDI, Enterprise Java Beans (EJB), Message Queues, Non-fungible Tokens (NFT), Full-stack, Data Analytics, Big Data, WebSockets, Unix Shell Scripting, OAuth, AWS Cloud Architecture, Lambda Functions, RESTful APIs, GlassFish, AWS, Ethers.js, IPFS

Education

  • Bachelor's Degree in System Analysis
    2000 - 2006
    Unisinos - Universidade do Vale do Rio dos Sinos - São Leopoldo - Brazil

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