Build reliable Java microservices at Citi using concurrency, observability, and automated testing for mission-critical distributed systems. This full time position seeks experienced back-end engineers.
The Senior Java Back-End Developer leads end-to-end technical delivery while remaining hands-on with core services. You will apply Spring Boot, REST or GraphQL, message streaming, and quality gates across scalable platforms. Responsibilities include performance tuning, resiliency, security, and collaboration with product, platform, and security stakeholders.
Key Responsibilities: Develop core services with Java 17+ and Spring Boot
Optimize concurrency, performance, observability, and operational excellence
Drive unit, integration, and contract testing strategies




Design data contracts and resilient integration patterns
Communicate technical trade-offs to varied audiences
Requirements: 5+ years of progressive enterprise systems experience
5+ years using Java and Spring at scale
Proven cloud-native, microservices, and event-driven architecture delivery
Understanding of fault tolerance, circuit breakers, retries, and bulkheads
Bachelor’s degree or university degree, or equivalent experience
Apply Java, Spring, testing, performance tuning, and resilience expertise to Citi’s enterprise back-end engineering work.

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📌 Senior Java Microservices Engineer (Ontario)
🏢 Citi
📍 Ontario