Server-Side API Engineer (Kotlin/Java) — REST & GraphQL NYC

Creative Solutions Services, LLC; New York (NY); On-site; USD 85,000 - 90,000; Full time

Job summary

Creative Solutions Services, LLC is urgently seeking a Server-Side API Engineer to design, build, and maintain backend services using Kotlin/Java, REST and GraphQL, with a focus on the Mobile Service Layer for enterprise mobile apps. This 6+ months contract is based onsite in New York City, NY.

The role requires hands-on Kotlin/Java development, Spring Boot, and strong experience in building scalable microservices, BFFs, and CI/CD pipelines.

Qualifications

• 5+ years of backend engineering experience; 10-12 years ideal.
• Production experience with Kotlin and Java.
• Strong experience building REST APIs.
• Working knowledge of GraphQL.
• Experience with Spring Boot and modern backend frameworks.
• Hands-on experience with CI/CD and automated testing.
• Strong debugging, refactoring, and performance optimization skills.

Responsibilities

• Design, build, and maintain server-side applications and APIs.
• Develop the Mobile Service Layer / BFF for mobile applications.
• Create scalable REST and GraphQL services.
• Write clean, maintainable Kotlin and Java code.
• Refactor and modernize legacy services while building new functionality.

Skills

Kotlin

Java

REST APIs

GraphQL

Spring Boot

CI/CD

Docker

Jenkins

GitHub Actions

Gradle

Microservices

BFF

Asynchronous programming

Tools

Jenkins

GitHub Actions

Gradle

Job description

Creative Solutions Services, LLC is urgently seeking a Server-Side API Engineer to design, build, and maintain backend services using Kotlin/Java, REST and GraphQL, with a focus on the Mobile Service Layer for enterprise mobile apps. This 6+ months contract is based onsite in New York City, NY.

The role requires hands-on Kotlin/Java development, Spring Boot, and strong experience in building scalable microservices, BFFs, and CI/CD pipelines.