Senior Java Engineer with AWS and Python

This Senior Java Engineer is a Contributor to the Java Spring Framework and a Tech Writer for the well-known blog Baeldung. He has over 8+ Years of Experience and will be available for a full time position.

Skills Senior Java Engineer with AWS and Python

Java 8 years
Spring Boot 5 years
AWS Cloud 5 years
ElasticSearch 4 years
Microservices 4 years
Redis 4 years
Jenkins 4 years
Docker 3 years
Apache Spark 2 years
Android 2 years

Education

TU München, LMU München, U Augsburg
Master of Science with Honors
2012-2014

Politehnica University Timisoara
Bachelor of Science
2008-2012

Senior AWS Solutions Architect with Python

Archiving System – TUI Jan 2022 – Present

The client, the no. 1 travel company in the world, had to maintain an expensive archiving solution
for internal documents. He faced high licensing and running costs and required ongoing support
from an external service provider.
• Reduced costs by 90% by designing and implementing a new archiving solution in the AWS
Cloud environment.
• Eliminated 100% of the dependency on the external service provider by creating an in-house
solution.
• Ensured 100% succes in future-proofing the service to be open for external clients by
implementing a generic and configurable authentication and authorization process.

Skills: AWS Services(S3, API Gateway, Lambda, DynamoDB, Step Functions, Eventbridge, SQS,
SES, OpenSearch), API Design, Database Design, Python 3.8, AWS Powertools, Chalice.

Senior Java Engineer & Data Engineer

Drug Discovery Platform – MERCK Jun 2021 – Dec 2021

The client, a leader in the pharmaceutical industry, was risking losing his superiority over the
competition due to a highly expensive and time-consuming drug discovery process.
• Reduced costs by more than 30% by developing a commercial, market-ready platform ready
to be sold to customers by designing and implementing services and data pipelines in AWS
Cloud.
• Increased drug discovery success rate by 25% by enabling the identification of nonmatching
molecules in the early stages of the discovery process by creating an automatized
cloud-native data pipeline

Skills: AWS Services(S3, API Gateway, Lambda, DynamoDB, Step Functions, Aurora), API Design,
Database Design, Spring Boot, Python, Java 11.

Senior Java Engineer

User Notification System – Universal Music Apr 2020 – Jun 2021

The client, a leader in the music industry, had low user retention on the website due to sending
user-specific notifications via email, which implied customers leaving the page and delayed
communication.
• Increased from 40 sec to 1 min the user’s average time on page and eliminated
information loss due to email spam filters, by designing a highly scalable in-app notification
system that kept the users informed without having to leave the website.

Skills: AWS System Architecture, AWS AppSync, AWS DynamoDB, AWS Lambda, AWS SNS,
GraphQL, Java 11.

Senior Java Engineer

External System Integration – Universal Music Mar 2019 – Apr 2020

The client, a leader in the music industry, was risking losing competitiveness in the future, by not
exposing information about songs involved in synchronization projects for the customers.
• Enabled a 30% expected growth in new users during 2021, by being the first on the market
to release in-depth analytics about synchronization projects
• Achieved a 95% performance gain and reduced the processing overhead of the external
services by 30%, measured by continuous performance tests, by implementing caching
strategies.

Skills: API Design, Spring Boot, AWS Elasticache Redis, Caffeine, Java 11.

Senior Java Engineer

ETL Engine for Artist Royalties – Universal Music Sep 2016 – Mar 2019

The client, a leader in the music industry, had an outdated royalty portal that could not keep up with
the customer’s requirements. The data retrieval had significant performance issues because it relied
on a legacy datastore and complex data analytics were not even possible to be performed.
• Provided light-speed data retrieval across 1.5 Billion records, by designing and
implementing a highly scalable ETL engine that ingested data from a Datawarehouse solution
over to AWS ElasticSearch Service.
• Successfully launched a market-leading platform reaching 2M+ page views and over
60K user registrations, by offering songwriters rich information insights and fast analytics
about their copyright data.
• Greatly reduced the data retrieval time from 1 hour to less than 5 seconds, by
leveraging the lightning-fast search and powerful analytics capabilities of ElasticSearch.
• Accomplished zero-downtime full data refresh, by using an index rollover strategy.

Skills: AWS System Architecture, AWS ElasticSearch Service, AWS S3, AWS Lambda, AWS ECS, AWS
SQS, AWS SNS, Spring Boot, Java 8.

Senior Java Engineer

ETL Engine for Artist Royalties – Universal Music Sep 2016 – Mar 2019

The client, a leader in the music industry, had an outdated royalty portal that could not keep up with
the customer’s requirements. The data retrieval had significant performance issues because it relied
on a legacy datastore and complex data analytics were not even possible to be performed.
• Provided light-speed data retrieval across 1.5 Billion records, by designing and
implementing a highly scalable ETL engine that ingested data from a Datawarehouse solution
over to AWS ElasticSearch Service.
• Successfully launched a market-leading platform reaching 2M+ page views and over
60K user registrations, by offering songwriters rich information insights and fast analytics
about their copyright data.
• Greatly reduced the data retrieval time from 1 hour to less than 5 seconds, by
leveraging the lightning-fast search and powerful analytics capabilities of ElasticSearch.
• Accomplished zero-downtime full data refresh, by using an index rollover strategy.

Skills: AWS System Architecture, AWS ElasticSearch Service, AWS S3, AWS Lambda, AWS ECS, AWS
SQS, AWS SNS, Spring Boot, Java 8.

Senior Big Data Engineer

Real-time network traffic threat detection – Atigeo Jan 2016 – Sep 2016

The client, who was activating in the cybersecurity industry, could not keep up with the analysis of
the continuously growing network traffic data, leading to a major impact on the business, because
detecting threats early was crucial for the security of the customers.
• Accelerated by 10x the threat detection compared to the previous system, by building a
performant Big Data engine capable of processing a 15 GB/min data stream in near-realtime.
• Achieved near-real-time TCP stream processing with a maximum delay of 10 minutes
during peak traffic, by distributing the data across a multinode Apache Spark cluster enabling
parallel processing.
• Improved query performance by 40%, measured by performance tests, by building a daily
file compaction job that merged many small files into fewer bigger ones.

Skills: Apache Spark, Python, PCAP, HDFS, Parquet, Hive.

Big Data Engineer

XPatterns Big Data ETL Service – Atigeo Feb 2015 – Jan 2016

The client, who was active in the data science industry, was losing money and competitiveness due to
many manual data processing and transfer tasks that were taking a lot of time and were error-prone.
• Reduced costs by 50% and greatly simplified the data transfer and transformation tasks
data scientists had to make, by automating all the slow and error-prone manual processes using
a Big Data solution.
• Increased by more than 100% the productivity of the data scientist, by providing a userfriendly
data transformation process that offered data scientists more time to focus on the
actual business-specific data analysis.

Skills: Apache Spark, Big Data, HDFS, Hive, Scala, Cloudera, Cassandra, ElasticSearch.

Android Java Developer

Multiplayer Android Games – Lasting Software Oct 2011 – Sep 2012

The client, who was activating in the software services industry, started to lose competitiveness by
not entering the mobile application market and it was critical for him to start developing
and publishing Android apps to extend his portfolio.
• Reduced by 5x the game development time, by using a design-first approach and
developing a common library for all games first.
• Increased the client’s revenue by 10% in the first year and diversified the business, by
successfully publishing 4 games on the Google Play Store.
• Reached around 50K downloads for each game with a 4+ star rating, offering a seamless
user experience and reacting to bugs with high agility.

Skills: Android, Java, WebSockets.