Valentin Marginean
Senior Backend Developer
Experience
Senior Backend Developer
Self-employed
- Long-term collaboration with clients from Germany - modernization and implementation with Spring Boot
- Participation in every stage of software development: defining requirements, planning sprints/tasks, implementation, automated testing, deployment, and bug fixing
- Implementation of automated tests with JUnit (80% test coverage for over 9 months)
- Software architecture and development of new modules with a focus on clean code and industry standards
- Development of client-side API code and integration with external APIs: Auth0, Amazon S3, Outlook email, and two proprietary insurer APIs
- Coaching of junior software developers
Backend Developer
Client in the finance sector
- On-site work with communication in German
- Development and automated testing (test coverage > 80%) for a modern Spring Boot microservice application
- Adjustments aimed at deployment across multiple environments: federal cloud, JBoss EAP, and Tomcat
Full Stack Developer
virtual7
- Design, implementation, and presentation of new microservice applications
- Automated testing: JUnit for backend, Jasmine & Karma for frontend
- Coaching of three new team members
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 (7.5 years), Insurance (5 years), and Banking and Finance (1.5 years).
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 (8.5 years), Quality Assurance (8.5 years), and Product Development (7.5 years).
Summary
I am a self-employed backend developer with 5 years of experience in international teams. Because I place a high value on good communication and collaboration, I can quickly get up to speed in new teams and coach new teammates in a short time.
One of my passions is learning. That allows me to become productive very quickly, even when the technology is new to me. Often it took less than 3 days from researching a new library to implementing new features.
I appreciate clean code and automated testing (with TDD). This way, I can write code that is easy to understand and maintain, and still in use many years later.
Skills
- Java & Junit
- Spring Boot
- Sql
- Elasticsearch
- Html & Css
- Javascript
- Microservices
- Docker
- Bash
- Portainer
- Autho
- Flyway
- Liquibase
- Hibernate Jpa
- React
- Swagger Openapi
- Talend Open Studio
Languages
Certifications & licenses
Spring Professional
Profile
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