Senior Server-Side Engineer (Java & Kotlin) - 3 Days Onsite

CSI GLOBAL LTD; Burgess Hill; Hybrid; GBP 70,000 - 110,000; Full time

Job summary

CSI GLOBAL LTD is seeking a Backend Engineer to design and operate server-side applications and distributed microservices in production. You will own RESTful APIs, event-driven data pipelines, and database interactions across SQL and NoSQL stores.

The role emphasizes defensive programming, comprehensive testing, and performance optimization to maintain enterprise reliability. Onsite work with some flexibility is required.

Qualifications

• Proven track record building and operating server-side applications and distributed microservices in production.
• Solid experience designing and consuming RESTful APIs and event-driven architectures with Apache Kafka.
• Hands-on database exposure across relational databases (e.g., PostgreSQL, Oracle, MySQL) or NoSQL data stores (e.g., MongoDB, Cassandra, DynamoDB); balanced exposure to both paradigms is highly valued.
• Experience with automated testing suites (unit, integration, regression) and modern CI/CD automation tools.
• Strong debugging, root-cause analysis, and performance optimization skills.

Responsibilities

• Articulate and defend architectural decisions, balancing trade-offs between monolith vs microservices, REST vs GraphQL, and synchronous vs event-driven patterns.
• Ensure defense in depth with fault containment, strict input validation, and enterprise security standards.
• Maintain clean code fundamentals with high-signal automated tests and readable abstractions that support team velocity.

Skills

Server-side development

Distributed microservices

REST APIs

Event-driven architectures

Performance optimization

Debugging

CI/CD automation

Testing (unit/integration)

Architectural decision making

Design reasoning

Tools

Apache Kafka

PostgreSQL

Oracle

MySQL

MongoDB

Cassandra

DynamoDB

Job description

CSI GLOBAL LTD is seeking a Backend Engineer to design and operate server-side applications and distributed microservices in production. You will own RESTful APIs, event-driven data pipelines, and database interactions across SQL and NoSQL stores.

The role emphasizes defensive programming, comprehensive testing, and performance optimization to maintain enterprise reliability. Onsite work with some flexibility is required.