Cosmin-Marian Adamut - Java Developer

Q: Where is Cosmin-Marian based?

Cosmin-Marian is based in Bucharest, Romania and can operate in on-site , hybrid , and remote work models.

Q: What languages does Cosmin-Marian speak?

Cosmin-Marian speaks the following languages: English (Advanced), Romanian (Intermediate) .

Q: How many years of experience does Cosmin-Marian have?

Cosmin-Marian has at least 8 years of experience. During this time, Cosmin-Marian has worked in at least 2 different roles and for 4 different companies . The average length of individual experience is 2 years . Note that Cosmin-Marian may not have shared all experience and actually has more experience.

Q: What is Cosmin-Marian's latest experience?

Cosmin-Marian's most recent position is Java Developer at Grubhub .

Q: What companies has Cosmin-Marian worked for in recent years?

In recent years, Cosmin-Marian has worked for Grubhub and Playtika .

Q: Which industries is Cosmin-Marian most experienced in?

Cosmin-Marian is most experienced in industries like Information Technology (IT) , Food and Beverage , and Automotive .

Q: Which business areas is Cosmin-Marian most experienced in?

Cosmin-Marian is most experienced in business areas like Information Technology (IT) , Product Development , and Operations . Cosmin-Marian also has some experience in Business Intelligence and Human Resources (HR) .

Q: Which industries has Cosmin-Marian worked in recently?

Cosmin-Marian has recently worked in industries like Food and Beverage and Information Technology (IT) .

Q: Which business areas has Cosmin-Marian worked in recently?

Cosmin-Marian has recently worked in business areas like Information Technology (IT) , Product Development , and Operations .

Recommended expert

Bucharest, Romania

Experience

May 2022 - Present

3 years 10 months

Java Developer

Grubhub

Secured and enhanced checkout experience by building a critical payment service that handled over 30% of all checkout traffic. The service reduced fraud risks, removed failure points, and offloaded pressure from dependent systems, while involving collaboration with 10+ external teams and systems.
Increased subscription adoption by 50% by contributing to the launch of new subscription benefits in partnership with a major brand. Led the research and execution of a large-scale update of over 4 million subscriptions and successfully migrated ~40,000 diners to a new subscription tier.
Increased subscriber acquisition by building a centralized partnership microservice used for managing ongoing partnerships without the intervention of the engineering team.
Reduced operational costs by ~55% and enhanced system scalability by optimizing AWS infrastructure, conducting performance testing, and collaborating with infrastructure teams to ensure efficient resource utilization.
Mentored engineers by providing code reviews, sharing best practices, and fostering a culture of technical growth and collaboration.

Sep 2020 - May 2022

1 year 9 months

Java Developer

Playtika

I was part of a team that developed multiple features for the World Series of Poker, enhancing the gameplay experience and functionality.
Preserved game stability and performance while maintaining and extending a legacy monolith system, ensuring consistent user experience during feature rollouts.
Reduced time-to-market for new in-game events by 50% by migrating critical functionality to a microservices architecture. This included developing multiple concurrent services to manage event progression and dynamic player rewards—all deployed without business downtime.
Boosted player retention by developing a new mini-game as a standalone microservice, designed with a flexible, configurable system that allowed real-time updates via a web interface—enabling faster iteration without service disruption.

Jul 2018 - Sep 2020

2 years 3 months

Java Developer

Sparktech

Extended AI: Enabled faster evaluation of Machine Learning experiments by developing a web application that automated result interpretation and accuracy reporting. Ensured scalable, decoupled communication between the Spring backend and ML components using Google Pub/Sub, with results stored in Google Cloud Storage and Cloud SQL for easy access and analysis.
Data governance application: Improved data flow, traceability, and integration across ingestion pipelines by developing multiple Java applications tailored to enterprise data needs. Automated file transfers between FTP, SFTP, and HDFS environments, categorized and indexed data in Elasticsearch and Apache Atlas, handled PostgreSQL operations, and enabled real-time processing through message queues.
Automotive application: Reduced analysis time and improved decision-making for an automotive client by replacing a manual, XML-based process with a web application. Enabled fast querying, filtering, and visualization of millions of car records—streamlining the identification of impacted vehicles and expanding analytical capabilities.
RESTful web server in Spring: Streamlined and improved the accuracy of candidate screening by automating resume evaluation for the HR department. Transformed a previously manual resume screening process into a faster and more reliable workflow by providing recruiters with data-driven scores to identify top candidates based on generated rankings.

Jul 2017 - Oct 2017

4 months

Java Developer Intern

Ymens Teamnet

Strengthened application security by implementing Google OAuth 2.0 in a full-stack fitness app (Java, Spring, AngularJS), safeguarding user data and elevating trust across the platform.
Implemented dynamic data visualizations to enhance user insight and engagement with fitness trends.

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Food and Beverage (4 years), Information Technology (4 years), and Automotive (2 years).

Food and Beverage

Information Technology

Automotive

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (8 years), Product Development (5.5 years), Operations (4 years), Business Intelligence (2 years), and Human Resources (2 years).

Information Technology

Product Development

Operations

Business Intelligence

Human Resources

Summary

I am a Senior Java Backend Developer with 7+ years of experience. Passionate about designing and implementing scalable, high-performance backend solutions, I thrive in challenging environments where I can build robust systems and optimize software efficiency.

Languages

English

Advanced

Romanian

Intermediate

Education

Oct 2018 - Jul 2020

Faculty of Mathematics and Computer Science

Master degree in Software Engineering · Software Engineering · Bucharest, Romania

Oct 2015 - Jul 2018

Faculty of Mathematics and Computer Science

Bachelor degree in Computer Science · Computer Science · Bucharest, Romania

Profile

Created

June 2024

Last Update

June 2025

Need a freelancer? Find your match in seconds.

Try FRATCH GPT

Frequently asked questions

Do you have questions? Here you can find further information.

Where is Cosmin-Marian based?

Cosmin-Marian is based in Bucharest, Romania and can operate in on-site, hybrid, and remote work models.

What languages does Cosmin-Marian speak?

Cosmin-Marian speaks the following languages: English (Advanced), Romanian (Intermediate).

How many years of experience does Cosmin-Marian have?

Cosmin-Marian has at least 8 years of experience. During this time, Cosmin-Marian has worked in at least 2 different roles and for 4 different companies. The average length of individual experience is 2 years. Note that Cosmin-Marian may not have shared all experience and actually has more experience.

What roles would Cosmin-Marian be best suited for?

Based on recent experience, Cosmin-Marian would be well-suited for roles such as: Java Developer, Java Developer Intern.

What is Cosmin-Marian's latest experience?

Cosmin-Marian's most recent position is Java Developer at Grubhub.

What companies has Cosmin-Marian worked for in recent years?

In recent years, Cosmin-Marian has worked for Grubhub and Playtika.

Which industries is Cosmin-Marian most experienced in?

Cosmin-Marian is most experienced in industries like Information Technology (IT), Food and Beverage, and Automotive.

Which business areas is Cosmin-Marian most experienced in?

Cosmin-Marian is most experienced in business areas like Information Technology (IT), Product Development, and Operations. Cosmin-Marian also has some experience in Business Intelligence and Human Resources (HR).

Which industries has Cosmin-Marian worked in recently?

Cosmin-Marian has recently worked in industries like Food and Beverage and Information Technology (IT).

Which business areas has Cosmin-Marian worked in recently?

Cosmin-Marian has recently worked in business areas like Information Technology (IT), Product Development, and Operations.

What is Cosmin-Marian's education?

Cosmin-Marian holds a Master in Software Engineering from Faculty of Mathematics and Computer Science and a Bachelor in Computer Science from Faculty of Mathematics and Computer Science.

What is the availability of Cosmin-Marian?

Cosmin-Marian is immediately available full-time for suitable projects.

What is the rate of Cosmin-Marian?

Cosmin-Marian's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.