Senior Java Developer

Flexton Inc.; Sunnyvale (CA); On-site; USD 61,992 - 68,880; Full time

Job summary

A technology consulting firm in Sunnyvale seeks a Senior Java Developer with over 6 years of experience in designing and developing enterprise-grade backend applications. The ideal candidate will have strong expertise in Java, Spring Boot, and cloud platforms, with responsibilities including application development, migration, and database management. This role offers a competitive hourly rate between $45.00/hr and $50.00/hr.

Qualifications

• 6+ years of experience in Java backend development.
• Hands-on experience with Spring Boot and REST API development.
• Strong knowledge of data structures, algorithms, and system design.
• Experience with data migration and management in Cassandra, Cosmos DB, or BigQuery.
• Proficiency in relational and NoSQL database systems.
• Working knowledge of Kafka for event-driven integration.
• Experience with cloud computing platforms (GCP and/or Azure preferred).
• Strong sense of ownership, accountability, and team collaboration.

Responsibilities

• Design, develop, and implement robust backend applications using Java and Spring Boot.
• Lead or support large-scale application migrations, including architectural redesign and infrastructure transition.
• Manage and migrate large datasets using Cassandra, Cosmos DB, or BigQuery.
• Design, implement, and optimize both relational and NoSQL database solutions.
• Build and consume RESTful APIs, ensuring scalability and high performance.
• Work with event-driven architectures using Apache Kafka to integrate backend systems.
• Collaborate with cross-functional teams using modern design-thinking principles.
• Ensure code quality through unit testing and best practices in backend development.
• Leverage cloud platforms such as Google Cloud Platform (GCP) and Microsoft Azure for application deployment.

Skills

Java backend development

Spring Boot

Data structures

Algorithms

System design

REST API development

Data migration

Cassandra

Cosmos DB

BigQuery

Relational databases

NoSQL databases

Kafka

Cloud computing

Job description

Base pay range

$45.00/hr - $50.00/hr

Job overview

We are looking for a Java Senior Developer with 6+ years of experience in designing, developing, and migrating enterprise-grade backend applications. The ideal candidate will have deep technical expertise in Java, Spring Boot, cloud platforms, and large-scale data systems, with a strong emphasis on system design and performance.

Key Responsibilities

• Design, develop, and implement robust backend applications using Java and Spring Boot.
• Lead or support large-scale application migrations, including architectural redesign and infrastructure transition.
• Manage and migrate large datasets using Cassandra, Cosmos DB, or BigQuery.
• Design, implement, and optimize both relational (Azure SQL) and NoSQL (Cassandra) database solutions.
• Build and consume RESTful APIs, ensuring scalability and high performance.
• Work with event-driven architectures using Apache Kafka to integrate backend systems.
• Collaborate with cross-functional teams using modern design-thinking principles to ensure timely, high-quality deliverables.
• Ensure code quality through unit testing and best practices in backend development.
• Leverage cloud platforms such as Google Cloud Platform (GCP) and Microsoft Azure for application deployment and scalability.

Required Skills

• 6+ years of experience in Java backend development
• Hands-on experience with Spring Boot and REST API development
• Strong knowledge of data structures, algorithms, and system design
• Experience with data migration and management in Cassandra, Cosmos DB, or BigQuery
• Proficiency in relational and NoSQL database systems
• Working knowledge of Kafka for event-driven integration
• Experience with cloud computing platforms (GCP and/or Azure preferred)
• Strong sense of ownership, accountability, and team collaboration