Horatiu J.

Full Stack Developer

525 dollar
10 years
Cluj-Napoca, ROMANIA

My experience


Gun.ioSeptember 2019 - Present

Certified freelance engineer on the Gun.io platform.

About Gun.io - Gun.io helps world-class engineering teams hire the world’s most sought-after freelance engineers at a moment’s notice.

Self-EmployedMay 2017 - Present

AWS, Serverless, Web Development, Big Data/Data Science
Opened to any programming language (experience with Java, Node.js and Scala)

Articles: https://medium.com/@horatiujeflea
Public projects: https://github.com/horatiujeflea

- Converzate - a San Francisco Startup, using AWS Serverless (Lambda, DynamoDB, SNS, Lex, Step Functions, S3...), Redshift, Java 8, React, Twilio
- Nitrovery, Ixaris client - Fintech product, using Java 8, Spring, Microservices, MySql, Docker, React, Angular

AirbaseNovember 2019 - Present

Stack: Python, Django, Celery, PostgreSql, Heroku, Github, Java, Dropwizard, React, Redux
About Airbase - US Fintech company making spend management simple. They are working with card payments, ACH transfers and checks.

Nitrovery LtdJanuary 2019 - October 2019

Ixaris client - Fintech Card Payments product, using Java 8, Spring, Microservices, MySql, Docker, React, Angular

TelenavMarch 2015 - May 2017

Big data analysis and development for improving openstreetmap.org (OSM) data.

Main contributor for the missing roads tool for OSM - http://improveosm.org

I was also in charge of the Hadoop cluster (1PB) administration/architecture.

Our input data consists of GPS probes from vehicles which we analyze with Spark and Machine

Learning (started out with MapReduce only). The results are elements which improve the map such as turn restrictions, missing roads and direction of flow.

My extra responsibilities are presented in the Managerial Skills section of this CV.

Technologies/Platforms used:

▪ Started with Cloudera, HBase, MapReduce, YARN, HDFS, Avro, SVN

▪ Continued with basic Spark, Oozie, Git as a second iteration

▪ Currently working with Spark SQL, Spark Machine Learning, Scala, Parquet, ElasticSearch, Zeppelin, Luigi on a 3rd improved version of our projects


Hewlett-PackardAugust 2012 - March 2015

Java Developer for HP UCMDB Browser product.

HP UCMDB is a CMDB and discovery software product.
A configuration management database (CMDB) is a repository that acts as a data warehouse for information technology (IT) organizations. Discovery populates the repository with data automatically gathered from the data center.

HP UCMDB Browser is a standalone application (deployed in Tomcat) which connects with UCMDB through an API. It was built to separate the administration logic/UI from the regular user. It is consumer oriented, with a modern web UI, easy deployment and new functionalities.

I started working on the project from it's incipient state (1 year of development) and brought it to a enterprise ready solution used by the customers. The team currently counts 4 developers (with over 10 in some time periods).

Technologies/Platforms used: Spring, GWT, Sencha GXT, YFiles for html, Tomcat/Jetty, JasperReports, Ehcache, Maven, Git, Intellij Idea, Oracle, JUnit, Jenkins, CSS, SCRUM

In the last 4 months I switched to Java and Investigation Engineer for HP UCMDB and other CMS Suite products. Responsible for handling (investigation and possibly fixing) customer incidents.
Also implementing visual web tools to facilitate investigation/debugging.

Midoco GmbHApril 2011 - September 2011

Part time java developer on a middleware software application for travel agencies.

Technologies/Platforms used: EJB, Hibernate, JasperReports, Castor, JBoss/Tomcat, Ant, Eclipse,

SVN, Informix/Oracle, SQL

My stack


Spring, Angular, Hibernate, Node.js


HBase, MySQL, DynamoDB


WEB, React



Software testing



CSS, HTML, Python, CSS3, Scala, JavaScript, SQL, Java, JAVA 8, OOP


Data Science


ElasticSearch, Machine Learning, MapReduce, React.js, AWS, Tomcat

IT Infrastructure

Linux, Security, Amazon Simple Notification Service (SNS), Git, Cloud Computing, AWS Lambda

Environment of Development

Maven, IntelliJ Idea

Big Data

Big Data, Spark, Hadoop

Analysis methods and tools

Junit, Design Patterns, Microservices, Scrum

My education and trainings

ICAgile Certified Professional (ICP) - --

Master's Degree - Information Technology in Economics - Technical University of Cluj-Napoca2012 - 2014

Software engineer - Computer Science - Technical University of Cluj-Napoca2008 - 2012