Senior Java Developer

Join Keystone Solutions as a Senior Java Developer consultant for a mission at our client. You will lead the design, development, and maintenance of backend components and RESTful APIs supporting enterprise-grade applications. As a Keystone Solutions consultant, you will collaborate closely with the client while ensuring robust, scalable, and maintainable solutions.

This is a consultancy engagement through Keystone Solutions, involving on-site collaboration at the client location for a minimum of 2 days per week. You will operate within the client?s environment while benefiting from Keystone Solutions? consultancy framework, applying your expertise to deliver tangible outcomes for the client?s projects.

• →Design, develop, and maintain backend services and REST APIs using Java and Spring Boot.
• →Ensure code quality through unit, integration, and performance testing.
• →Conduct code reviews, promote best practices, and mentor junior developers.
• →Collaborate with architects, analysts, and DevOps engineers to define and refine technical solutions.
• →Support deployment, cutover, and hypercare phases, ensuring stable releases.
• →Troubleshoot and resolve production issues, ensuring system performance and reliability.
• →Maintain and update technical documentation for services, configurations, and interfaces.
• →Contribute to technical design discussions, ensuring alignment with architectural principles and cloud strategy.

All the responsibilities above will be performed as a Keystone Solutions consultant, embedded with the client and working within their processes and teams.

• A minimum of 10 years working experience as a Java developer.
• Demonstrable experience ? minimum 5 years with microservices architecture.
• Demonstrable working experience with integration with SaaS solutions.
• Demonstrable experience ? minimum 5 years with Spring framework.
• Minimum 2 days per week onsite.
• C1 level (or equivalent) proficiency in spoken and written English.

• Core Java Proficiency: Uses OOP, collections, streams, and exception handling effectively.
• Frameworks & Libraries: Applies Spring Boot, JPA/Hibernate, Maven/Gradle, testing frameworks.
• API Design & Integration: Designs clean, reusable REST APIs, respects standards and security.

As a Keystone Solutions consultant, you will have opportunities to work on diverse challenges across client projects, applying your backend and API expertise to different domains and technical landscapes.

Keystone Solutions supports continuous professional growth through exposure to varied client environments, modern engineering practices, and collaborative delivery models, helping you expand both depth and breadth in Java, Spring, microservices, and cloud-aligned architectures.

Through the consultancy model, your impact and career trajectory are accelerated by high-responsibility roles, client-facing problem solving, and the chance to mentor and lead engineering standards across engagements.

Being a K-Stone means bringing excellence, accountability, and collaboration to every client mission. You will embody these values in design discussions, code quality practices, production reliability work, and cross-functional teamwork with architects, analysts, and DevOps engineers.

If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal.