Duration: 6 – 12 months
Hybrid: 3 days per week on site (mandatory)
Start: ASAP
My new client is looking for 2 experienced Senior Java Developers with strong back‑end engineering skills to support the design, development, and optimization of our API‑driven services. This is a freelance/contract role ideal for someone who thrives in a fast‑moving environment, can work independently, and brings deep expertise across Java, modern API architectures, and complementary .NET technologies.
Responsibilities
* Architect, develop, and maintain scalable Java-based back‑end services and RESTful APIs
* Collaborate with cross‑functional teams to design efficient system integrations and data flows
* Enhance existing services for performance, reliability, and security
* Contribute to solution design discussions, providing technical leadership and best practices
* Work with .NET components where required to ensure seamless interoperability across platforms.
* Write clean, maintainable, well‑tested code
* Troubleshoot complex issues across distributed systems
* Participate in code reviews and provide mentorship‑level feedback when needed
Required Skills & Experience
* 7+ years of professional experience in back‑end development
* Expert‑level proficiency in Java (Java 8+), Spring Boot, and related frameworks
* Strong experience building and consuming RESTful APIs
* Solid understanding of microservices, distributed systems, and cloud‑native architectures
* Hands‑on experience with .NET / .NET Core for service integration or cross‑stack development
* Proficiency with relational and NoSQL databases
* Familiarity with CI/CD pipelines, containerization (Docker, Kubernetes), and DevOps workflows
* Strong problem‑solving skills and the ability to work autonomously
* Excellent communication skills and comfort collaborating in remote teams
Nice‑to‑Have
* Experience with message queues (Kafka, RabbitMQ, etc.)
* Knowledge of cloud platforms (AWS, Azure, GCP)
* Exposure to API gateways, authentication/authorization frameworks (OAuth2, JWT)
* Background in high‑availability or enterprise‑scale systems
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