Freelancer profile translated to English.
Back to original languageAbout Ruslan
Back-End Developer | Java | Spring Boot | Kotlin 💫
Do you need arobust**, **scalable**, and **well-integrated front-endbackend? I design production-ready backend APIs and architectures, built to last in Java, **Spring Boot**, and **Kotlin**.
I am aJava / Spring Boot back-end developer**, with 10 years of experience in demanding environments, both in the **public sector(Ministry of the Interior, ASP) and withmajor private companies(Accor, Porsche, Malakoff Humanis).
My role is to ensure thereliability**, **maintainability**, and **scalability of back-end architectureswhile delivering concrete results from the first sprints.
I work on the entire back-end project lifecycle:overhauls**, **Java migrations**, **REST API development**, **SSO authentication**, **CI/CDimplementation, and deployment onKubernetes/Docker/GCP/ **Azure**.
I am proficient inKotlinas well asJava/Spring Boot**, and I can also work on the front-end with **Angularif needed.
My goal is to deliver a backend that is:
Technical Stack: Java, Spring Boot, Kotlin, Angular, GitLab CI/CD, Github CI/CD, Jenkins, SonarQube, Docker, Kubernetes, Google Cloud Platform, Azure, JUnit, JMeter, Selenium.
Need an experienced and autonomous backend profile?
Whether for an overhaul, an upgrade, or a long-term roadmap, I can work on yourJava**, **Spring Boot**, **Kotlinprojects.
Contact me, I'll get back to you within 1 hour.
French
Native or bilingual
Russian
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km), Toulouse (up to 50km), Bordeaux (up to 50km), Marseille (up to 50km), Lyon (up to 50km)
Experience
- Omnitech SecurityAndroid Developer | KotlinPUBLIC SAFETYJuly 2025 - Today (1 year and 1 month)Bordeaux, France→ Mission Objective:Modernize and secure anAndroidaccess management application for airport employees.→ Achievements:Stabilized the app on older Android versions through debugging andtargeted optimization(Android, compatibility, mobile security)Complete refactoring for morereadable**, **maintainable**, and **robustcode, reducing technical debt (Kotlin, clean code, Android architecture)Migration to Kotlin with continuous integration (Team City), strengtheningsecurityandcompliance(Kotlin, application security,CI/CD)→ Technical Stack:Kotlin, Android, Java 17, Team City, REST API
- Malakoff HumanisLead Back-End Developer Java | KotlinMEDICALJune 2024 - March 2025 (9 months)Bordeaux, France→ Mission Objective:Overhaul and secure a health application to optimize policyholder experience and accelerate delivery cycles.→ Achievements:Implementation of **secure SSO**, ensuring **access security**, GDPR **compliance**, and a **fluid user experience**.Complete backend overhaul inJavaand **Kotlin**, ensuring **scalability**, **maintainability**, and **application performance**.Continuous delivery to demo and production environments, with aKubernetes-readyprocess, forfastand **reliable deployments**.→ Technical Stack:Java, Kotlin, Spring Boot, SSO, Kubernetes, PostgreSQL, GitLab CI/CD, REST API
- Ministère de l'intérieurLead Back-End Developer JavaPUBLIC SECTORDecember 2022 - June 2024 (1 year and 6 months)Bordeaux, France→ Mission Objective:Strengthen fraud detection through a technical overhaul of a big data investigation platform for compliance departments.→ Achievements:Complete migration from **Java 8 to Java 17**, improving backend architecture **performance**, **security**, and **maintainability**.Backend overhaul inJava Spring BootwithDocker**, boosting **scalabilityand simplifyingproject managementand **deployments**.Automation ofintegration tests (Mockito)and **performance tests (JMeter)**, ensuring reliability of analyses and critical interfaces.→ Technical Stack:Java 17, Spring Boot, Docker, Mockito, JMeter, Selenium, Git, PostgreSQL
Reviews
Jean-Kelly
JK'S
Reviewed on 7/10/2025
Very successful 1-hour consulting session on my SkinMatch project
Ruslan has solid technical expertise in Android mobile technologies (Kotlin,).
Excellent advice on MVVM architecture and project roadmap. Realistic assessment of feasibility with risk identification.
Very professional, punctual, and efficient. Quickly grasped the challenges and proposed concrete solutions.
I am continuing the collaboration with him for development.
I recommend him without hesitation.
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Education
- Master in Internet and Communication NetworksUniversity of Bordeaux2018Master Réseaux Internet et Communications
- Bachelor's Degree in Computer ScienceFrançois Rabelais University2016Licence Informatique