Costin Oncioiu - Java Developer

Q: Where is Costin based?

Costin is based in Cluj-Napoca, Romania .

Q: What languages does Costin speak?

Costin speaks the following languages: English (Advanced), Romanian (Advanced) .

Q: How many years of experience does Costin have?

Costin has at least 8 years of experience. During this time, Costin has worked in at least 6 different roles and for 7 different companies . The average length of individual experience is 1 year and 1 month . Note that Costin may not have shared all experience and actually has more experience.

Q: What is Costin's latest experience?

Costin's most recent position is Java Developer at Eucon Gmbh .

Q: What companies has Costin worked for in recent years?

In recent years, Costin has worked for Eucon Gmbh and Coherent Solutions .

Q: Which industries is Costin most experienced in?

Costin is most experienced in industries like Information Technology (IT) , Manufacturing , and Telecommunication . Costin also has some experience in Advertising , Education , and Utility Services .

Q: Which business areas is Costin most experienced in?

Costin is most experienced in business areas like Information Technology (IT) , Product Development , and Quality Assurance (QA) . Costin also has some experience in Finance , Supply Chain Management , and Human Resources (HR) .

Q: Which industries has Costin worked in recently?

Costin has recently worked in industries like Information Technology (IT) and Advertising .

Q: Which business areas has Costin worked in recently?

Costin has recently worked in business areas like Information Technology (IT) , Product Development , and Quality Assurance (QA) .

Recommended expert

Cluj-Napoca, Romania

Experience

May 2023 - Present

2 years 10 months

Cluj-Napoca, Romania

Java Developer

Eucon Gmbh

Use my knowledge to design the domain of the platform aligning with the business objectives
Implemented robust authentication and authorization system in a dynamic multi-tenant environment
Coded the business layer logic, using the best software development standards in the industry including quality gates and testing coverage
Continuously contributed to creating a maintainable architecture that fits the product expansion plans based on the business needs

Dec 2021 - May 2023

1 year 6 months

Java Developer - Spring Boot

Coherent Solutions

Created the business logic that helps configure client advertising campaigns and aggregates data into reports for the UI team
Created a business layer from scratch with various microservices and used AWS to facilitate communication between them
Built a wrapper over company SSO to add security and enable authentication and authorization
Enhanced application performance to ensure fast responses despite large data loads
Participated in architecture design, domain modeling, splitting business logic across microservices, designing lambdas, analyzing and optimizing dataflow
Owned different parts of the project and improved, solved problems, and helped teammates interact with them

Oct 2020 - Dec 2020

3 months

Cluj-Napoca, Romania

Fullstack Java Developer

Jouve International

Developed new features and extended existing ones for a financial reports and proxy statements platform resembling Google Sheets
Analyzed client requirements and delivered high-quality solutions
Built authentication and authorization mechanisms
Adjusted application to enhance performance
Took interviews with newcomers and integrated them into the team
Performed backend work and contributed to some frontend development

Oct 2018 - Oct 2020

2 years 1 month

Cluj-Napoca, Romania

Fullstack Java Developer

Artsoft Consult

Developed B2B software used by leading global telecommunication companies with fast and efficient responses
Contributed to resource management platform and connector interface for payment, billing, stocks, and shop connections for a major machinery manufacturer
Optimized parallel processing code to increase efficiency, readability, and predictability

Apr 2018 - Oct 2018

7 months

Cluj-Napoca, Romania

Software Engineer

Micro Focus

Worked on a platform for full server management of thousands of servers
Integrated new operating systems into the system
Improved old components and developed new ones

Jul 2017 - Apr 2018

10 months

Cluj-Napoca, Romania

Web Developer

TSS-YONDER

Developed a large management platform for employee management of schools and utility companies
Implemented features based on requirement analysis and clarified requirements with the customer

May 2017 - Jul 2017

3 months

Cluj-Napoca, Romania

Android Intern

Halcyon Mobile

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 Information Technology (7 years), Manufacturing (2 years), Telecommunication (2 years), Advertising (1.5 years), Education (1 year), and Utilities (1 year).

Information Technology

Manufacturing

Telecommunication

Advertising

Education

Utilities

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 years), Quality Assurance (3 years), Finance (2 years), Supply Chain Management (2 years), and Human Resources (1 year).

Information Technology

Product Development

Quality Assurance

Finance

Supply Chain Management

Human Resources

Summary

I'm a Senior Java developer/engineer with 6.5 years of hands-on software development and experience collaborating with worldwide companies. My expertise includes all layers of the development process from database design and business logic to front-end software implementation and deployment. Easily integrable in any team, I played an important role throughout my career helping my teams deliver high quality, future proof software products.

Skills

Backend:

Java Core, Spring Framework, Spring Boot
Spring Security, Jwt, Oauth2
Hibernate, Jpa, Spring Data
Rest, Hateoas
Postgresql, Mongodb, Mysql, Liquibase, Flyway
Junit, Mockito, Spock (Groovy)

Cloud:

Aws, Lambda, S3, Sqs, Eventbridge, Ec2, Cloudwatch

Other:

Maven, Git, Bitbucket, Jira
Sonarqube, Jenkins, Docker, Kubernetes
Microservices Architecture, Layered Architecture, Event-driven Architecture
Design Patterns, Solid Principles, Clean Code, Kiss

Frontend:

Angular, Typescript
Angular Material, Bootstrap
Html, Css, Javascript, Jquery

Languages

English

Advanced

Romanian

Advanced

Education

Oct 2018 - Jun 2020

Faculty of Mathematics and Informatics, Babes-Bolyai University of Cluj-Napoca

Master in Software Engineering, Event-Driven Microservices with CQRS and Event Sourcing · Software Engineering · Cluj-Napoca, Romania

Oct 2015 - Jul 2018

Faculty of Mathematics and Informatics, Babes-Bolyai University of Cluj-Napoca

Bachelor in Computer Science, Cross platform mobile faculty timetable using cloud web scrapping · Computer Science · Cluj-Napoca, Romania

Profile

Created

January 2024

Last Update

January 2025

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Frequently asked questions

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

Where is Costin based?

Costin is based in Cluj-Napoca, Romania.

What languages does Costin speak?

Costin speaks the following languages: English (Advanced), Romanian (Advanced).

How many years of experience does Costin have?

Costin has at least 8 years of experience. During this time, Costin has worked in at least 6 different roles and for 7 different companies. The average length of individual experience is 1 year and 1 month. Note that Costin may not have shared all experience and actually has more experience.

What roles would Costin be best suited for?

Based on recent experience, Costin would be well-suited for roles such as: Java Developer, Java Developer - Spring Boot, Fullstack Java Developer.

What is Costin's latest experience?

Costin's most recent position is Java Developer at Eucon Gmbh.

What companies has Costin worked for in recent years?

In recent years, Costin has worked for Eucon Gmbh and Coherent Solutions.

Which industries is Costin most experienced in?

Costin is most experienced in industries like Information Technology (IT), Manufacturing, and Telecommunication. Costin also has some experience in Advertising, Education, and Utility Services.

Which business areas is Costin most experienced in?

Costin is most experienced in business areas like Information Technology (IT), Product Development, and Quality Assurance (QA). Costin also has some experience in Finance, Supply Chain Management, and Human Resources (HR).

Which industries has Costin worked in recently?

Costin has recently worked in industries like Information Technology (IT) and Advertising.

Which business areas has Costin worked in recently?

Costin has recently worked in business areas like Information Technology (IT), Product Development, and Quality Assurance (QA).

What is Costin's education?

Costin holds a Master in Software Engineering from Faculty of Mathematics and Informatics, Babes-Bolyai University of Cluj-Napoca and a Bachelor in Computer Science from Faculty of Mathematics and Informatics, Babes-Bolyai University of Cluj-Napoca.

What is the availability of Costin?

Costin is immediately available for suitable projects.

What is the rate of Costin?

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